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Investigation on process mechanism of a novel energy-saving synthesis for high performance Li_(4)Ti_(5)O_(12) anode material 被引量:1
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作者 Guochuan Wang Hongmei Wang +8 位作者 Guangqiang Ma Xinhe Du Liyu Du Peng Jing Yanqing Wang Kaipeng Wu Hao Wu Qian Wang Yun Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第7期266-275,I0008,共11页
Li_(4)Ti_(5)O_(12)(LTO) anode material demonstrates superior cycling performance due to its stable spinel structure and high lithiation/de-lithiation potential.Herein,a novel energy-saving solid-phase synthesis route ... Li_(4)Ti_(5)O_(12)(LTO) anode material demonstrates superior cycling performance due to its stable spinel structure and high lithiation/de-lithiation potential.Herein,a novel energy-saving solid-phase synthesis route for LTO has been successfully designed,employing the cheap industrial intermediate product of metatitanic acid (HTO) as titanium source.Through the in-situ Fourier transform infrared spectroscopy (FTIR)and ex-situ X-ray diffraction (XRD),it is revealed for the first time that the amorphous crystal structure of HTO is more conducive for the Li+insertion,making it possible to prepare LTO at a relatively lower sintering temperature.Utilizing the dehydration carbonization reaction between glucose and sulfuric acid,an ingenious strategy of glucose pre-coating is adopted to avoid the generation of Li_(2)SO_(4) impurity caused by the residual sulfuric acid on the surface of HTO,which meanwhile enhances the conductivity and inhibits the particle growth of LTO.The obtained ALTO@C anode material consequently exhibits excellent electrochemical performance that 132.0 m Ah g^(-1)is remained even at 20 C,and ultra low decay rate of 0.015% per cycle is achieved during 1000 cycles at 2 C.Remarkably,LiCoO_(2)//ALTO@C full cell delivers conspicuous low-temperature property (130.7 m Ah g^(-1)at 0.5 C and almost no attenuation after 300 cycles under-20℃). 展开更多
关键词 Metatitanic acid Carbonization promoted by sulfuric acid ENERGY-SAVING Low temperature performance Lithium titanate anode
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Inclusive Proton Energy Spectra of the Deuteron Induced Reaction
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作者 WANG Jia YE Tao +2 位作者 SUN Wei-Li Yukinobu Watanabe Kazuyuki Ogata 《Chinese Physics Letters》 SCIE CAS CSCD 2011年第11期87-90,共4页
The continuum-discritized coupled channel method and the glauber model are applied for the description of deuteron elastic breakup and the stripping processes,respectively.Combined with the conventional two-component ... The continuum-discritized coupled channel method and the glauber model are applied for the description of deuteron elastic breakup and the stripping processes,respectively.Combined with the conventional two-component exciton model for pre-equilibrium processes and the Hauser-Feshbach theory for compound process,an approach based on models is proposed to analyze the inclusive proton energy spectra of a deuteron-induced reaction.The contributions from each process to the energy spectra of the 58Ni(d,xp)reaction are quantitatively given.The results show that this approach is able to reasonably reproduce the experimental data of the double differential cross sections,energy spectra and cross sections,although further improvements are needed. 展开更多
关键词 REACTION SPECTRA STRIPPING
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Bio-Derived Hierarchical Multicore–Shell Fe2N-Nanoparticle-Impregnated N-Doped Carbon Nanofiber Bundles:A Host Material for Lithium-/Potassium-Ion Storage 被引量:10
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作者 Hongjun Jiang Ling Huang +5 位作者 Yunhong Wei Boya Wang Hao Wu Yun Zhang Huakun Liu Shixue Dou 《Nano-Micro Letters》 SCIE EI CAS CSCD 2019年第4期18-34,共17页
Despite the significant progress in the fabrication of advanced electrode materials,complex control strategies and tedious processing are often involved for most targeted materials to tailor their compositions,morphol... Despite the significant progress in the fabrication of advanced electrode materials,complex control strategies and tedious processing are often involved for most targeted materials to tailor their compositions,morphologies,and chemistries.Inspired by the unique geometric structures of natural biomacromolecules together with their high affinities for metal species,we propose the use of skin collagen fibers for the template crafting of a novel multicore-shell Fe2N-carbon framework anode configuration,composed of hierarchical N-doped carbon nanofiber bundles firmly embedded with Fe2N nanoparticles(Fe2N@N-CFBs).In the resultant heterostructure,the Fe2N nanoparticles firmly confined inside the carbon shells are spatially isolated but electronically well connected by the long-range carbon nanofiber framework.This not only provides direct and continuous conductive pathways to facilitate electron/ion transport,but also helps cushion the volume expansion of the encapsulated Fe2N to preserve the electrode microstructure.Considering its unique structural characteristics,Fe2N@N-CFBs as an advanced anode material exhibits remarkable electrochemical performances for lithium-and potassium-ion batteries.Moreover,this bio-derived structural strategy can pave the way for novel low-cost and high-efficiency syntheses of metal-nitride/carbon nanofiber heterostructures for potential applications in energy-related fields and beyond. 展开更多
关键词 Anode material Iron nitride Lithium-ion BATTERY Potassium-ion BATTERY Multicore-shell structure
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Construction of Electrocatalytic and Heat-Resistant Self-Supporting Electrodes for High-Performance Lithium–Sulfur Batteries 被引量:8
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作者 Xuemei Zhang Yunhong Wei +4 位作者 Boya Wang Mei Wang Yun Zhang Qian Wang Hao Wu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2019年第4期386-402,共17页
Boosting the utilization efficiency of sulfur electrodes and suppressing the“shuttle effect”of intermediate polysulfides remain the critical challenge for high-performance lithium-sulfur batteries(LSBs).However,most... Boosting the utilization efficiency of sulfur electrodes and suppressing the“shuttle effect”of intermediate polysulfides remain the critical challenge for high-performance lithium-sulfur batteries(LSBs).However,most of reported sulfur electrodes are not competent to realize the fast conversion of polysulfides into insoluble lithium sulfides when applied with high sulfur loading,as well as to mitigate the more serious shuttle effect of polysulfides,especially when worked at an elevated temperature.Herein,we reported a unique structural engineering strategy of crafting a unique hierarchical multifunctional electrode architecture constructed by rooting MOF-derived CoS2/carbon nanoleaf arrays(CoS2-CNA)into a nitrogen-rich 3D conductive scaffold(CTNF@CoS2-CNA)for LSBs.An accelerated electrocatalytic effect and improved polysulfide redox kinetics arising from CoS2-CNA were investigated.Besides,the strong capillarity effect and chemisorption of CTNF@CoS2-CNA to polysulfides enable high loading and efficient utilization of sulfur,thus leading to high-performance LIBs performed not only at room temperature but also up to an elevated temperature(55°C).Even with the ultrahigh sulfur loading of 7.19 mg cm?2,the CTNF@CoS2-CNA/S cathode still exhibits high rate capacity at 55°C. 展开更多
关键词 Metal organic framework Lithium-sulfur BATTERIES Cobalt sulfide HEAT-RESISTANT N-doped carbon foam
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In-situ formation of Li_(0.5)Mn_(0.5)O coating layer through defect controlling for high performance Li-rich manganese-based cathode material 被引量:4
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作者 Aipeng Zhu Qin Wang +7 位作者 Yin Zhang Yueyin Zhang Xiaogang He Kaipeng Wu Hao Wu Qian Wang Wenlong Cai Yun Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第8期384-391,I0010,共9页
Li-rich layered oxide of Li_(1.2)Mn_(0.6)Ni_(0.2)O_(2)(LMNO)with a considerable specific capacity and higher voltage is regarded as a kind of promising cathode material.However,it suffers from transition metal ion dis... Li-rich layered oxide of Li_(1.2)Mn_(0.6)Ni_(0.2)O_(2)(LMNO)with a considerable specific capacity and higher voltage is regarded as a kind of promising cathode material.However,it suffers from transition metal ion dissolution and oxygen escape that leads to rapid capacity decay.In addition,the poor lithium-ion diffusion kinetics gives rise to unsatisfied rate performance.Herein,a stable layer of Li_(0.5)Mn_(0.5)O(LMO)out of LMNO is in-situ constructed through acetic passivation and following calcination process.The generated defect structure in the composite material exhibits fast ion diffusion kinetics and the produced LMO layer can stabilize the substructure,resulting in elevated cycling stability and rate performance.In specific,the LMNO@LMO material exhibits a high initial coulombic efficiency of 80.3%and remarkable capacity retention of 80.7%after 200 cycles at 1 C.Besides,the composite material reveals prominent rate performance that delivers discharge capacities of 158 and 131 m Ah g^(-1) at 5 and 10 C,respectively.At last,this study presents a new approach to optimizing the Li-rich cathode materials. 展开更多
关键词 Defect Interfacial stability Li_(0.5)Mn_(0.5)O Li-rich layered oxides Lithium-ion batteries
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Visualization of High-Speed Impact of Projectile in Granular Sheet with Destructive Collision of Particles 被引量:1
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作者 Chihiro Masaki Kojiro Suzuki Yasumasa Watanabe 《Journal of Flow Control, Measurement & Visualization》 2018年第3期136-151,共16页
The impact and penetration of a projectile in a particle-laden space, which are expected to have frequently occurred during the formation of the solar system and will occur in the case of an impact probe for future pl... The impact and penetration of a projectile in a particle-laden space, which are expected to have frequently occurred during the formation of the solar system and will occur in the case of an impact probe for future planetary exploration, were experimentally simulated by using the ballistic range. A two-dimensional sheet made from small glass beads or emery powder was formed by the free-falling device through a long slit in the test chamber evacuated down to about 35 Pa. A polycarbonate projectile of a hemi-sphere-cylinder or sphere shape with the mass and diameter about 4 g and 25 mm, respectively, was launched at the velocity up to 430 m/s, and the phenomena were observed by the high-speed camera at 20,000 fps. From a series of images, the bow-shock-wave-like laterally facing U-shaped pattern over the projectile and the absence of particles in the trail behind it were clearly seen. At the impact of the particles on the projectile surface, fine grains were formed due to the destructive collision and injected outward from the projectile. The images obtained by different lighting methods including the laser light sheet were compared. The effects of the particle diameter, its material and the impact velocity were also investigated. 展开更多
关键词 BALLISTIC Range IMPACT GRANULAR Flow COLLISION HIGH-SPEED Camera
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Visualization of High-Speed Impact of Penetrator into Icy Target 被引量:1
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作者 Kojiro Suzuki Kazuya Namba Yasumasa Watanabe 《Journal of Flow Control, Measurement & Visualization》 2016年第2期56-69,共14页
For application to exploration under the surface of icy objects in the solar system, the penetration of an impact probe into an icy target was experimentally simulated by using the ballistic range. Slender projectiles... For application to exploration under the surface of icy objects in the solar system, the penetration of an impact probe into an icy target was experimentally simulated by using the ballistic range. Slender projectiles with a cylindrical body and various nose shapes were tested at the impact velocity 130 - 420 m/s. The motion of the penetrator, fragmentation of ice and crater forming were observed by the high-speed camera. It revealed that the crown-shaped ejection was made for a short time after the impact and then the outward normal jet-like stream of ice pieces continued for much longer time. The concave shape of the crater was successfully visualized by pouring the plaster into it. The two-stage structure, the pit and the spall, was clearly confirmed. The rim was not formed around the crater. Observation of the crater surface and the ice around the trace of the penetrator shows that both crushing into smaller ice pieces and recompression into ice blocks are caused by the forward motion of the penetrator. In case of a body with a flow-through duct, ice pieces entering the inlet at the nose tip were ejected from the tail, resulting in relaxation of the impact force. The correlation of the penetration distance and the crater diameter with the impact velocity was investigated. 展开更多
关键词 PENETRATOR ICE IMPACT Crater Forming Ballistic Range High-Speed Camera
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Demonstration of Automatic Impedance-Matching and Constant Power Feeding to and Electric Helicopter via Magnetic Resonance Coupling 被引量:1
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作者 Masato Yamakawa Kohei Shimamura +1 位作者 Kimiya Komurasaki Hiroyuki Koizumi 《Wireless Engineering and Technology》 2014年第3期45-53,共9页
Wireless power transfer (WPT) from a transmitter resonator on the ground to an electrically powered miniature heli-copter was attempted to demonstrate WPT using magnetic resonance coupling to an object moving in 3D sp... Wireless power transfer (WPT) from a transmitter resonator on the ground to an electrically powered miniature heli-copter was attempted to demonstrate WPT using magnetic resonance coupling to an object moving in 3D space. The transmission efficiency was optimized by automatic impedance matching for different flight attitudes: a maximum flight altitude of 590 mm was achieved. Furthermore, an estimation method of transmission efficiency using only the properties on the transmitter side was proposed, with transmission power regulated as constant against the change in the coupling coefficient. 展开更多
关键词 Wireless POWER Transfer POWER Regulation RESONATOR FLYING Object
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Degradation of Aqueous 2,6-Dibromophenol Solution by In-Liquid Dielectric Barrier Microplasma 被引量:1
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作者 Shin-Ichiro Kojima Keiko Katayama-Hirayama Tetsuya Akitsu 《World Journal of Engineering and Technology》 2016年第3期423-432,共11页
Degradation of 2,6-dibromophenol (2,6-DBP) in the aqueous solution was studied using dielectric barrier discharge in micro-bubbles. Experimental comparison of working gas Ar, N<sub>2</sub>, O<sub>2&l... Degradation of 2,6-dibromophenol (2,6-DBP) in the aqueous solution was studied using dielectric barrier discharge in micro-bubbles. Experimental comparison of working gas Ar, N<sub>2</sub>, O<sub>2</sub>, and air showed that oxygen and air plasma efficiently decomposed 2,6-DBP to bromide ion, and inorganic carbon. The molecular orbital model was applied in the analysis of the degradation in electrophilic, nucleophilic, and radical reactions. 展开更多
关键词 2 6-Dibromophenol Atmospheric Pressure Plasma Inductive Energy-Storage System
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Improving electrochemical properties of carbon paper as negative electrode for vanadium redox battery by anodic oxidation
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作者 HOU Bing-xue CUI Xu-mei +1 位作者 ZHANG Qi CHEN Yun-gui 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第6期1435-1442,共8页
Anodic oxidation with different electrolyte was employed to improve the electrochemical properties of carbon paper as negative electrode for vanadium redox battery(VRB).The treated carbon paper exhibits enhanced elect... Anodic oxidation with different electrolyte was employed to improve the electrochemical properties of carbon paper as negative electrode for vanadium redox battery(VRB).The treated carbon paper exhibits enhanced electrochemical activity for V^2+/V^3+redox reaction.The sample(CP-NH3)treated in NH3 solution demonstrates superior performance in comparison with the sample(CP-NaOH)treated in NaOH solution.X-ray photoelectron spectroscopy results show that oxygen-and nitrogen-containing functional groups have been introduced on CP-NH3 surface by the treatment,and Raman spectra confirm the increased surface defect of CP-NH3.Energy storage performance of cell was evaluated by charge/discharge measurement by using CP-NH3.Usage of CP-NH3 can greatly improve the cell performance with energy efficiency increase of 4.8%at 60 mA/cm^2.The excellent performance of CP-NH3 mainly results from introduction of functional groups as active sites and improved wetting properties.This work reveals that anodic oxidation is a clean,simple,and efficient method for boosting the performance of carbon paper as negative electrode for VRB. 展开更多
关键词 vanadium redox battery carbon paper negative electrode anodic oxidation electrochemical kinetics
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Promoted hydrolysis performances and mechanism of Si-NaBH4-AlCl_(3) in deionized water
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作者 Zhao Feng Chaoling Wu +3 位作者 Shuang Zhong Yungui Chen Hui Chen Yao Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第12期3136-3144,共9页
Si-based hydrolysis material system can be used in mobile/portable hydrogen source applications connected to fuel cells but is limited by alkaline solutions.In the present research,we reported an acid/alkaline free hy... Si-based hydrolysis material system can be used in mobile/portable hydrogen source applications connected to fuel cells but is limited by alkaline solutions.In the present research,we reported an acid/alkaline free hydrolysis systemcombining siliconwith NaBH4.Sampleswith different ratios between Si and NaBH4 are prepared via high energy ball milling and hydrolyzed in deionized water at different temperatures.Synergetic effect between silicon and NaBH4was found in the hydrolysis process.2Si-NaBH4 sample displays the best hydrolysis performances with the hydrogen yield of 1594 ml·g^(−1) in deionized water at 70℃.Thereafter,AlCl3 is added into the 2Si-NaBH4 sample to further improve its comprehensive properties.The effect of AlCl3 content and promotion mechanism of the reaction are explored.2Si-NaBH4-5 wt% AlCl3 sample shows a significant improvement with a high hydrogen yield of 1689 ml·g^(−1) in deionized water at 70℃ and a corresponding conversion rate of 95.8%,indicating that the Si-NaBH4-AlCl3 composite is promising to be a hydrogen source in applications of mobile/portable fuelcell-powered facilities. 展开更多
关键词 HYDROLYSIS Hydrogen generation Si-NaBH4-AlCl_(3)composite Synergetic effect
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Synthesis of SiOx Nano-Powders Using a Microwave Plasma Torch at Atmospheric Pressure
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作者 Dong Hun Shin Yun Seok Choi +2 位作者 Dong Jin Ku Yong Cheol Hong Bong Ju Lee 《Soft Nanoscience Letters》 2016年第2期31-36,共6页
The silicon oxide nano-powders (SiO<sub>x</sub>-NPs) were obtained in an atmospheric microwave plasma torch using a gas-phase silicon tetrachloride (SiCl<sub>4</sub>) with N<sub>2</sub... The silicon oxide nano-powders (SiO<sub>x</sub>-NPs) were obtained in an atmospheric microwave plasma torch using a gas-phase silicon tetrachloride (SiCl<sub>4</sub>) with N<sub>2</sub> and H<sub>2</sub>. The gas-phase SiCl<sub>4</sub> was injected with H<sub>2</sub> gas into the microwave plasma torch generated by N<sub>2</sub> and air swirl gas, and then the dark brown powders were deposited on the inner wall of a quartz tube. The sample was analyzed by an X-ray photoelectron spectroscopy (XPS), a scanning electron microscope (SEM), an energy dispersive spectrometer (EDS), and an X-ray diffraction (XRD). The average size and oxidation x values of synthesized SiO<sub>x</sub>-NPs were approximately 230 nm and 0.91, respectively. Furthermore, the volumetric charge capacity is 1127 mAh/g and has 89.2% retention after 100 cycles. 展开更多
关键词 Silicon Oxide Secondly Battery Microwave Plasma Torch Volumetric Charge Capacity Oxidation Value
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The Mechanism of SPP1 Pathway in the Immune Microenvironment of Glioblastoma
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作者 Gao Feifei Bing Zhitong +4 位作者 Li Yang Yuan Linyan Chen Weiqiang Yang Lei Liu Yang 《IMP & HIRFL Annual Report》 2022年第1期179-180,共2页
Glioblastoma(GBM)has a highly genetic heterogeneity and immunosuppressive microenvironment,leading to the inevitable emergence of treatment resistance and poor prognosis.This study aimed to explore the role of macroph... Glioblastoma(GBM)has a highly genetic heterogeneity and immunosuppressive microenvironment,leading to the inevitable emergence of treatment resistance and poor prognosis.This study aimed to explore the role of macrophages related pathways in the occurrence and development of GBM.Firstly,we developed an immune-related prognostic model and verified its ability to signi cantly distinguish between good and bad outcomes of patients(Fig.1(a)). 展开更多
关键词 GLIOBLASTOMA IMMUNE PATIENTS
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Enlarging Zn deposition space via regulating Sn-induced effective interface for high areal capacity zinc-based flow battery
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作者 Yuning Sun Siyu Zhang +5 位作者 Qiming Zhang Lantong Cui Pengfei Wang Yanbin Yin Qian Wang Qinzhi Lai 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第11期579-586,I0012,共9页
Zinc-based flow batteries(ZFBs)have aroused great favor in large-scale energy storage due to the high security and low cost.However,the low areal capacity arising from the limited space for Zn plating hinders the furt... Zinc-based flow batteries(ZFBs)have aroused great favor in large-scale energy storage due to the high security and low cost.However,the low areal capacity arising from the limited space for Zn plating hinders the further development.Herein,a novel carbon felt-Sn-carbon felt sandwich host(CSCH)is designed and constructed.Benefiting from the strong chemical absorption and the dehydration effect on Zn(H_(2)O)_(6)^(2+),the Sn activation layer in the CSCH demonstrates the lowest comprehensive resistance for Zn deposition.Thus,Zn is induced to nucleate preferentially on the Sn activation layer,and grows towards the membrane,regulating the spatial distribution of Zn electrochemical deposits,which remarkably improves the areal capacity and cyclic stability of Zn anode.Consequently,the zinc-bromine flow batteries equipped with CSCH electrodes can achieve the ultra-high areal capacity of 120 mA h cm^(-2)at 80 mA cm^(-2),and run stably for 140 h with average energy efficiency of 80.3%in the extreme condition(80 mA cm^(-2),80 mA h cm^(-2)).This innovative work will inspire future advanced designs for high areal capacity electrodes in ZFBs. 展开更多
关键词 Zinc-based flow batteries High areal capacity Sn-induced deposition Zn deposition depth
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CO2/CH4 separation using inside coated thin film composite hollow fiber membranes prepared by interfacial polymerization 被引量:4
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作者 Eun-Sung Jo Xinghai An +3 位作者 Pravin G.Ingole Won-Kil Choi Yeong-Sung Park Hyung-Keun Lee 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第3期278-287,共10页
Carbon dioxide(CO_2) is greenhouse gas which originates primarily as a main combustion product of biogas and landfill gas. To separate this gas, an inside coated thin film composite(TFC) hollow fiber membrane was deve... Carbon dioxide(CO_2) is greenhouse gas which originates primarily as a main combustion product of biogas and landfill gas. To separate this gas, an inside coated thin film composite(TFC) hollow fiber membrane was developed by interfacial polymerization between 1,3–cyclohexanebis–methylamine(CHMA) and trimesoyl chloride(TMC). ATR-FTIR, SEM and AFM were used to characterize the active thin layer formed inside the PSf hollow fiber. The separation behavior of the CHMA-TMC/PSf membrane was scrutinized by studying various effects like feed gas pressure and temperature. Furthermore, the influence of CHMA concentration and TMC concentration on membrane morphology and performance were investigated. As a result, it was found that mutually the CHMA concentration and TMC concentration play key roles in determining membrane morphology and performance. Moreover, the CHMA-TMC/PSf composite membrane showed good CO_2/CH_4 separation performance. For CO_2/CH_4 mixture gas(30/70 by volume) test, the membrane(PD1 prepared by CHMA 1.0% and TMC 0.5%) showed a CO_2 permeance of 25 GPU and the best CO_2/CH_4 selectivity of 28 at stage cut of 0.1. The high CO_2/CH_4 separation performance of CHMA-TMC/PSf thin film composite membrane was mostly accredited to the thin film thickness and the properties of binary amino groups. 展开更多
关键词 Thin-film composite hollow fiber membrane Interfacial polymerization CHMA/TMC CO2/CH4 separation
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Wireless Power Feeding with Strongly Coupled Magnetic Resonance for a Flying Object 被引量:1
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作者 Masayoshi Koizumi Kimiya Komurasaki +1 位作者 Yoshihiro Mizuno Yoshihiro Arakawa 《Wireless Engineering and Technology》 2012年第2期86-89,共4页
Wireless power feeding was examined with strongly coupled magnetic resonance for an object moving in 3-D space. Electric power was transmitted from the ground to an electrically powered toy helicopter in the air. A li... Wireless power feeding was examined with strongly coupled magnetic resonance for an object moving in 3-D space. Electric power was transmitted from the ground to an electrically powered toy helicopter in the air. A lightweight receiver resonator was developed using copper foil. High Q of greater than 200 was obtained. One-side impedance matching the transmitter side was proposed to cope with high transmission efficiency and the receiver’s weight reduction. Results show that the efficiency drop near the ground was drastically improved. Moreover, the measured efficiency showed good agreement with theoretical predictions. A fully equipped helicopter of 6.56 g weight was lifted up with source power of about 5 W to an altitude of approximately 10 cm. 展开更多
关键词 WIRELESS POWER Transmission Coupling Coefficient IMPEDANCE Matching Quality Factor RESONATOR
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A dynamic infiltration technique to synthesize nanolayered cathodes for high performance and robust solid oxide fuel cells
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作者 Saeed Ur Rehman Ho-Seon Song +7 位作者 Hye-Sung Kim Muhammad Haseeb Hassan Dong-Woo Joh Rak-Hyun Song Tak-Hyoung Lim Jong-Eun Hong Seok-Joo Park Seung-Bok Lee 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第7期201-210,I0006,共11页
Solution infiltration is a popular technique for the surface modification of solid oxide fuel cell(SOFC)cathodes.However,the synthesis of nanostructured SOFC cathodes by infiltration is a tedious process that often re... Solution infiltration is a popular technique for the surface modification of solid oxide fuel cell(SOFC)cathodes.However,the synthesis of nanostructured SOFC cathodes by infiltration is a tedious process that often requires several infiltration and high temperature(≥500℃)calcination cycles.Moreover,fabricating large-area nanostructured cathodes via infiltration still requires serious attention.Here,we propose a facile and scalable urea assisted ultrasonic spray infiltration technique for nanofabrication of SOFC cathodes.It is demonstrated that by using urea as a precipitating agent,the calcination after each infiltration cycle can be omitted and the next infiltration can be performed just after a drying step(≤100℃).Finally,the precipitates can be converted into a desired catalyst phase in single calcination thus,a nanostructured cathode can be fabricated in a much faster manner.It is also shown that the low calcination temperature of the cathode(≤900℃)can produce highly durable SOFC performance even without employing a Ce_(0.9)Gd_(0.1)O_(2)(GDC)diffusion barrier layer which provides the ease of SOFC fabrication.While coupling with an ultrasonic spray technique,the urea assisted infiltration can be scaled up for any desired cathode area.La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3) nanolayered cathode was fabricated and it was characterized by scanning electron microscope(SEM),X-ray diffraction(XRD),and transmission electron microscopy(TEM)techniques.SEM showed the formation of a nanolayer cathode just after 5 cycles of the urea assisted infiltration while the XRD and TEM confirmed the phase and stoichiometric uniformity of the 100 nm cathode nanolayer.The effectiveness of the newly developed technique was further verified by the stable operation of a GDC buffer layer free SOFC having an active cathode area of 25 cm^(2) during a 1200 h durability test.The research outcomes propose urea assisted ultrasonic spray infiltration as a facile,scalable,and commercially viable method for the fabrication of durable nanostructured SOFC cathodes. 展开更多
关键词 Solid oxide fuel cell(SOFC) Cathode INFILTRATION NANOLAYER Nanofabrication GDC barrier layer free SOFC
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Transient Behavior in Water Distillation Tower for Tritium Separation and Its Long-Time Operation Test Results
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作者 Yoshiaki Miho Satoshi Fukada +4 位作者 Mitsuki Arimoto Takaho Takeuchi Tomohiro Motomura Junji Mizutani Satoru Hirano 《Journal of Power and Energy Engineering》 2017年第3期1-17,共17页
Transient separation behavior in tritiated water distillation tower packed with materials having ability to adsorb water is investigated analytically and experimentally for nuclear reactor safety. Analytical equations... Transient separation behavior in tritiated water distillation tower packed with materials having ability to adsorb water is investigated analytically and experimentally for nuclear reactor safety. Analytical equations based on the stage model are set up for simulation of the transient behavior of tritium (T) separation from wastewater. It is found that a dimensionless time defined in terms of the inside vapor flow rate and the liquid holdups in tower, reboiler and condenser can correlate variations over time to achieve a steady-state T concentration. However, when mixing with different T concentrations at a feed point occurs, the transition time period becomes longer than expected. Effects of the reflux ratio, the stage separation factor and the total stage number on the transient and steady-state T concentrations are numerically calculated. Variations over time to achieve each steady-state value are compared with experimental data using a small-scale tower. Long time distillation experiment for one month has been completed, and it is confirmed that a distillation column packed with ceramic Raschig rings coated with zeolite 13X adsorbent is hardly affected by water corrosion. 展开更多
关键词 WATER DISTILLATION Tritium ISOTOPE SEPARATION Transient Analysis Adsorption Wastewater
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Nanomaterials in Low-Temperatures Fuel Cells—The Latest Reports
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作者 Renata Wlodarczyk 《Materials Sciences and Applications》 2019年第10期643-664,共22页
Nanotechnology is a field of research with objects up to 100 nm in size. Nanomaterials belong to a wide area in the field of material engineering. These include nanolayers, nanoslabs, nanopores, nanotubes, nanofibers,... Nanotechnology is a field of research with objects up to 100 nm in size. Nanomaterials belong to a wide area in the field of material engineering. These include nanolayers, nanoslabs, nanopores, nanotubes, nanofibers, nanoparticles and quantum dots. Nanostructures are characterized by special properties due to their nanometric dimensions. The natural properties of nanostructures allow their wide application in various industries. The paper presents an overview of the application and significance of nanostructures in fuel cell technology, with particular emphasis on nanocatalysts. The article includes the classification of nanomaterials, new hybrid nanostructures, types of surface modification, division by area of application, with particular emphasis on nanomaterials in the advanced energy system. The design and operation of fuel cells and the role of nanoparticles have been described taking into account existing solutions to reduce generator costs. The high price of low temperature fuel cells depends on the number of nanoparticles used. The article describes the risk associated with using products at the nano scale. Higher concentrations of these extremely active materials can be dangerous and can cause ecological problems and harm natural ecosystems. 展开更多
关键词 NANOCATALYST Nanoparticles LOW-TEMPERATURE FUEL Cell Hydrogen Technology
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Wireless Power Transmission into a Space Enclosed by Metal Walls Using Magnetic Resonance Coupling
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作者 Masato Yamakawa Yoshihiro Mizuno +2 位作者 Jun Ishida Kimiya Komurasaki Hiroyuki Koizumi 《Wireless Engineering and Technology》 2014年第1期19-24,共6页
In this paper, a wireless power transmission system using magnetic resonance coupling was proposed and demonstrated for supplying power at high efficiency to electrical devices in a space enclosed by metal walls. This... In this paper, a wireless power transmission system using magnetic resonance coupling was proposed and demonstrated for supplying power at high efficiency to electrical devices in a space enclosed by metal walls. This is applicable to power supply to electrical sensors or devices working in the area surrounded by metal walls. Proposed magnetic resonance coupling system is driven at a resonance frequency of 50 Hz, which is selected to avoid eddy current loss on the surrounding metals. Firstly, resonator designs and its performance limitation were described. Secondly, the equivalent circuits and theoretical transmission efficiency were presented. Finally, power transmission was experimentally demonstrated and transmission efficiency was measured in some conceivable situations. As a result, electric power of 3 W was supplied to LEDs over a stainless steel wall. When the stainless steel wall thickness was 10 mm, transmission efficiency of approximately 40% was achieved over the transmission distance of 12 cm. Moreover, in the demonstration of transmission through a metal pipe, 1.2 W of power was transmitted to LEDs in a 10 mm thick metal pipe. 展开更多
关键词 Magnetic SHIELDING EDDY Current LOSS AC 50 HZ Standard DEPTH of PENETRATION
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