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交换电极法强化电动修复铬污染土壤 被引量:25
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作者 路平 冯启言 +2 位作者 李向东 袁涛 孙悦 《环境工程学报》 CAS CSCD 北大核心 2009年第2期354-358,共5页
pH值是影响污染土壤电动修复的主要因素。为此提出了交换电极法强化电动修复,并对该技术进行了实验研究。实验土壤Cr污染浓度为506.36 mg/kg,工作电压为1 V/cm,结果显示,固定电极方向运行模式下,运行2 d,产生聚焦效应,运行8 d,碱性区Cr(... pH值是影响污染土壤电动修复的主要因素。为此提出了交换电极法强化电动修复,并对该技术进行了实验研究。实验土壤Cr污染浓度为506.36 mg/kg,工作电压为1 V/cm,结果显示,固定电极方向运行模式下,运行2 d,产生聚焦效应,运行8 d,碱性区Cr(III)残留量和酸性区Cr(VI)残留量较大,分别是97.88 mg/kg和328 mg/kg,总铬去除率为59.04%。采用交换电极法,交换频率为4 d,运行8 d,总铬去除率为70.18%;交换频率为2 d,运行8 d,总铬去除率高达86.10%,土壤中总铬平均含量从506.36 mg/kg降至73.56 mg/kg,达到酸性土壤环境质量一级标准。该技术可控制土壤pH值在中性范围,电流密度高,不添加化学试剂,操作简单。 展开更多
关键词 电动修复 交换电极 铬污染土壤 聚焦效应 电流密度
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有自动交换电极功能的数控电火花成形机的自动化工艺
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作者 伍端阳 《电加工与模具》 2008年第4期69-72,共4页
介绍了具有自动交换电极功能的数控电火花成形机的标准自动化工艺和电极偏心补偿自动化工艺,详细讲解了这两种工艺的操作、编程、执行过程,并对两种工艺方法的电极定位问题、应用场合进行了具体分析。
关键词 电火花加工 自动交换电极 自动化工艺 电极偏心补偿
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电极化离子交换床离子色谱:离子回流
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作者 Small,H 朱岩 《国外分析仪器技术与应用》 2000年第1期18-25,共8页
本文阐述了离子回流的原理,给出了两种类型的离子回流装置的研究结果,并预见用离子回流原理设计新型离子仪器的可能性。
关键词 离子回流 电极化离子交换床离子色谱
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Gd@C_(2n)的高效合成与提取 被引量:1
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作者 孙大勇 刘子阳 +3 位作者 郭兴华 徐文国 季怡萍 刘淑莹 《物理化学学报》 SCIE CAS CSCD 北大核心 1996年第10期873-875,共3页
Endohedral metallofullerene Gd@C2n were synthesized with high-yield using the carbon-arc discharge method of activating the Gd2O3-containing graphite anode in situ and back-burning technique. A series of Cd@C(2n) fo... Endohedral metallofullerene Gd@C2n were synthesized with high-yield using the carbon-arc discharge method of activating the Gd2O3-containing graphite anode in situ and back-burning technique. A series of Cd@C(2n) for 2n from 70 to 96 were effectively extracted by toluene at high-temperature and under high-pressure condition. Gd@C(82),Gd@C(74) were considered to be fairly stable and soluble metallofullerene species. 展开更多
关键词 富勒烯 金属富勒烯 原位活化 交换电极回放
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Improvement in electrokinetic remediation of Pb-contaminated soil near lead acid battery factory 被引量:9
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作者 蔡宗平 Jeremiahvan DOREN +1 位作者 方战强 李伟善 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第9期3088-3095,共8页
To improve the conventional electrokinetic remediation of Pb-contaminated soil,the Pb-contaminated soil near a lead acid battery factory in the Pearl River Delta region of China was electrokinetically remedied with po... To improve the conventional electrokinetic remediation of Pb-contaminated soil,the Pb-contaminated soil near a lead acid battery factory in the Pearl River Delta region of China was electrokinetically remedied with polarity exchange technique.The variations in Pb removal efficiency and the soil p H value with the treatment time and the exchange polarity interval were determined.It is found that the removal efficiency of Pb reaches a maximum of 87.7% when the voltage gradient is 1 V/cm and the exchange polarity interval is 48 h.This value is far higher than that obtained with conventional electrokinetic remediation(61.8%).Additionally,the "focusing effect" which appears in the conventional electrokinetic remediation can be avoided,and thus additional chemicals are not needed for the polarity exchange technique.The mechanism of Pb electromigration behavior in soil during the treatment with the polarity exchange technique was described. 展开更多
关键词 electrokinetic remediation polarity exchanges Pb-contaminated soil
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Novel forward mode AC/AC converters with high frequency link 被引量:1
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作者 李磊 陈道炼 胡育文 《Journal of Southeast University(English Edition)》 EI CAS 2003年第3期246-249,共4页
A circuit configuration and a circuit topologic family of the novel forward mode AC/AC converters with high frequency link are presented. The circuit configuration is constituted of input cycloconverter, high frequenc... A circuit configuration and a circuit topologic family of the novel forward mode AC/AC converters with high frequency link are presented. The circuit configuration is constituted of input cycloconverter, high frequency transformer, output cycloconverter, input and output filters. The circuit topologic family includes eight circuit topologies, such as full-bridge-full-wave mode, etc. The bi-polarity phase-shifted control strategy and steady principles are thoroughly investigated. The output characteristics are obtained. By using the bi-polarity phase-shifted control strategy with phase-shifted control between the output cycloconveter and the input cycloconverter, commutation overlap period of the output cycloconverter, and polarity selection of the output filtering inductance current and the input voltage, the leakage inductance energy and the output filtering inductance current are naturally commutated, and surge voltage and surge current of the cycloconverters are overcome. The converters have such advantages as simple topology, two-stage power conversions(LFAC/HFAC/LFAC), bi-directional power flow, high frequency electrical isolation, good output waveforms, and strong ability to stabilize voltage. The converters lay key technical foundation on a new-type of regulated sinusoidal AC power supplies and electronic transformers. The correction and advancement of the converters are well verified by a principle test. 展开更多
关键词 forward mode high frequency link AC/AC converter bi-polarity phase-shifted control CYCLOCONVERTER
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Research on Bipolar Membrane Electrodialysis for Ion Exchange of Molecular Sieves 被引量:1
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作者 Chen Beiyan Liu Zhongqing +2 位作者 Zhou Lina Luo Yibin Shu Xingtian 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2018年第2期1-5,共5页
In view of the problems associated with large amount of discharged wastewater and serious pollution in the existing technology for removing sodium species from molecular sieves,this research work introduces the bipola... In view of the problems associated with large amount of discharged wastewater and serious pollution in the existing technology for removing sodium species from molecular sieves,this research work introduces the bipolar membrane electrodialysis into the process of removing sodium species from molecular sieves,and proposes a novel method of cleanly removing sodium from molecular sieves.The results show that the technology for removing sodium ions from the molecular sieves with an indirect electrodialysis process is feasible,and can recover Na OH solution.The bipolar membrane electrodialysis is especially suitable for treating the USY,ZSM-5 and Beta molecular sieves with high acid-resistance,and the physicochemical properties and catalytic performance of the prepared molecular sieves are roughly equivalent to those of the ammonium ion-exchange method.In comparison with the ammonium ion-exchange method,the process is clean and environmentally friendly,which consumes less water,and does not discharge wastewater to exhibit a rosy prospect of industrial application. 展开更多
关键词 molecular sieve ionexchange bipolarmembrane ELECTRODIALYSIS
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Continuous Separation of Cesium Based on NiHCF/PTCF Electrode by Electrochemically Switched Ion Exchange 被引量:1
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作者 孙斌 郝晓刚 +3 位作者 王忠德 张忠林 刘世斌 官国清 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第5期837-842,共6页
Nickel hexacyanoferrate (NiHCF) film was synthesized on porous three-dimensional carbon felt (PTCF) substrate by repetitious batch chemical depositions, and the NiHCF/PTCF electrode was used as electrochemically switc... Nickel hexacyanoferrate (NiHCF) film was synthesized on porous three-dimensional carbon felt (PTCF) substrate by repetitious batch chemical depositions, and the NiHCF/PTCF electrode was used as electrochemically switched ion exchange (ESIX) electrode in a packed bed for continuous separation for cesium ions. The morphologies of the prepared electrodes were characterized by scanning electron microscopy and the effects of solution concentration on the ion-exchange capacity of the electrodes were investigated by cyclic voltammetry technique. Cycling stability and long-term storage stability of NiHCF/PTCF electrodes were also studied. The NiHCF/PTCF electrodes with excellent ion-exchange ability were used to assemble a diaphragm-isolated ESIX reactor for cesium separation. Continuous separation of cesium and regeneration of NiHCF/PTCF electrode based on the diaphragm-isolated reactor were performed in a laboratory-scale two-electrode system. 展开更多
关键词 nickel hexacyanoferrate electrochemically switched ion exchange cesium separation porous carbon felt
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Research on the variable speed system of large power alternating current motor 被引量:1
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作者 Li Chongjian 《Engineering Sciences》 EI 2012年第1期30-37,共8页
The development status of the variable speed system of large power AC(alternating current)motor drive in China is introduced.The large power AC drive fed by AC-AC converters(cycloconverters)has developed greatly,and s... The development status of the variable speed system of large power AC(alternating current)motor drive in China is introduced.The large power AC drive fed by AC-AC converters(cycloconverters)has developed greatly,and some innovations on the theory and engineering technique have been realized.They have been applied to rolling mills,mine hoists,and so on,and remarkable economic and social benefit has been achieved.The development of AC drive fed by large power IGCT(integrated gate commutated thyristors)AC-DC-AC converter is also introduced.It has excellent performance and reliable operation,and has been used in traction. 展开更多
关键词 large power AC motor CYCLOCONVERTER AC-DC-AC converter IGCT
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Ion-Conductive-Polymer-Film Actuators with Pt Electrodes Selectively Grown using Non-Electrolyzed Plating
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作者 Kohei Oguma Yasushiro Nishioka 《Journal of Chemistry and Chemical Engineering》 2011年第6期558-565,共8页
Organic soft actuators are of special interest in many fields including intravascular neurosurgery. Ion conductive polymer film (ICPF) actuators have been one of the strong candidates. The ICPF investigated here was... Organic soft actuators are of special interest in many fields including intravascular neurosurgery. Ion conductive polymer film (ICPF) actuators have been one of the strong candidates. The ICPF investigated here was a cation-exchange membrane (Nation 117, Du Pont). When a voltage is given between the metal eIectrodes of an ICPF actuator, the ICPF actuator bends in the water due to the motion of Li+ cations with associated water. In order to increase the freedom of the deformation of the ICPF actuator, structures of independent electrode pairs were proposed. The electrodes were selectively deposited by non-electrokvzed plating including the Pt [(NH3)6]^4+ deposition process in a [Pt(NH3)6]Cl4 solution and the reduction process in a NaBH4 solution. Here, an elastomer adhesive tape with a fine electrode patterns was used performances were reported in detail. as a mask. The actuators processing conditions and their actuator 展开更多
关键词 ICPF Soft actuator Pt electrode non-electrolyzed plating.
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Corrosion Resistance of Titanium Bipolar Plate Enhanced by TiN Film
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作者 Deng Zhenzhen Dai Zhengfei +6 位作者 Wu Weibo Lai Ruisi Feng Qing Jia Bo Wang Chen Lv Yuanjiang Ma Fei 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2024年第10期2755-2765,共11页
To improve the corrosion resistance of titanium(Ti)bipolar plate,titanium nitride(TiN)film was prepared on the surface of commercial TA1 pure titanium by magnetron reactive sputtering and pulse laser deposition(PLD)te... To improve the corrosion resistance of titanium(Ti)bipolar plate,titanium nitride(TiN)film was prepared on the surface of commercial TA1 pure titanium by magnetron reactive sputtering and pulse laser deposition(PLD)techniques,and the film prepared under different process parameters were evaluated.Results show that dense and complete TiN film can be obtained on TA1 surface under different preparation processes,and the corrosion current density of Ti substrate significantly increases.However,the composition of the film prepared by magnetron reactive sputtering is affected by the oxygen competition reaction,and its homogeneity is inferior to that of the film prepared by PLD.The comprehensive performance of the PLD-prepared film shows excellent characteristics in the terms of low corrosion current density(0.025μA·cm^(−2)),moderate corrosion overpotential(−0.106 V),and good hydrophobicity. 展开更多
关键词 proton exchange membrane water electrolyzer bipolar plate process parameter TiN film corrosion resistance
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Dicarboxylate CaC8H4O4 as a high-performance anode for Li-ion batteries 被引量:3
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作者 Liping Wang Haiquan Zhang +5 位作者 Chengxu Mou Qianling Cui Qijiu Deng Jing Xue Xinyi Dai Jingze Li 《Nano Research》 SCIE EI CAS CSCD 2015年第2期523-532,共10页
Currently, many organic materials are being considered as electrode materials and display good electrochemical behavior. However, the most critical issues related to the wide use of organic electrodes are their low th... Currently, many organic materials are being considered as electrode materials and display good electrochemical behavior. However, the most critical issues related to the wide use of organic electrodes are their low thermal stability and poor cycling performance due to their high solubility in electrolytes. Focusing on one of the most conventional carboxylate organic materials, namely lithium terephthalate Li2CsH4O4, we tackle these typical disadvantages via modifying its molecular structure by cation substitution. CaCsH4O4 and A12(C8H4O4)3 are prepared via a facile cation exchange reaction. Of these, CaCsH4O4 presents the best cycling performance with thermal stability up to 570℃ and capacity of 399 mA.h.g-1, without any capacity decay in the voltage window of 0.005-3.0 V. The molecular, crystal structure, and morphology of CaCsH4O4 are retained during cycling. This cation-substitution strategy brings new perspectives in the synthesis of new materials as well as broadening the applications of organic materials in Li/Na-ion batteries. 展开更多
关键词 calcium terephthalate CARBOXYLATE Li-ion batteries organic electrode
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Finite p-groups with a minimal non-abelian subgroup of index p(Ⅱ) 被引量:10
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作者 AN LiJian LI LiLi +1 位作者 QU HaiPeng ZHANG QinHai 《Science China Mathematics》 SCIE 2014年第4期737-753,共17页
We classify completely three-generator finite p-groups G such that Ф(G)≤Z(G)and|G′|≤p2.This paper is a part of the classification of finite p-groups with a minimal non-abelian subgroup of index p,and solve partly ... We classify completely three-generator finite p-groups G such that Ф(G)≤Z(G)and|G′|≤p2.This paper is a part of the classification of finite p-groups with a minimal non-abelian subgroup of index p,and solve partly a problem proposed by Berkovich. 展开更多
关键词 minimal non-abelian p-groups At-groups congruent relation sub-congruent relation
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Discrepant roles of adsorbed OH^* species on IrWOx for boosting alkaline hydrogen electrocatalysis 被引量:4
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作者 Luhong Fu Fulin Yang +3 位作者 Youcheng Hu Yunbo Li Shengli Chen Wei Luo 《Science Bulletin》 SCIE EI CAS CSCD 2020年第20期1735-1742,M0004,共9页
Improving the slow kinetics of alkaline hydrogen electrode reactions, involving hydrogen oxidation and evolution reactions(HOR/HER) is highly desirable for accelerating the commercialization of alkaline exchange membr... Improving the slow kinetics of alkaline hydrogen electrode reactions, involving hydrogen oxidation and evolution reactions(HOR/HER) is highly desirable for accelerating the commercialization of alkaline exchange membrane-based fuel cells(AEMFCs) and water electrolyzers(AEMWEs). However, fundamental understanding of the mechanism for HOR/HER catalysis under alkaline media is still debatable. Here we develop an amorphous tungsten oxide clusters modified iridium-tungsten nanocrystallines(Ir WOx)which exhibited by far the highest exchange current density and mass activity, about three times higher than the commercial Pt/C toward alkaline HOR/HER. Density functional theory(DFT) calculations reveal the WOxclusters act as a pivotal role to boost reversible hydrogen electrode reactions in alkaline condition but via different mechanisms, which are, hydrogen binding energy(HBE) mechanism for HOR and bifunctional mechanism for HER. This work is expected to promote our fundamental understanding about the alkaline HOR/HER catalysis and provide a new avenue for rational design of highly efficient electrocatalysts toward HOR/HER under alkaline electrolytes. 展开更多
关键词 Hydrogen oxidation reacion Hydrogen evolution reaction IrWOx HBE Bi-functional mechanism
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A Thermal Analysis of Characteristic Parameters in the Electrode-Region for Tubular Plasma Generators
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作者 LinLie WuChengkang 《Journal of Thermal Science》 SCIE EI CAS CSCD 1995年第3期174-179,共6页
A thermal analysis of characteristic parameters in the electrode-region for tubular plasma generators is developed. Results of calculation on temperature of electrodes, evaporation rate and erosion rate for different ... A thermal analysis of characteristic parameters in the electrode-region for tubular plasma generators is developed. Results of calculation on temperature of electrodes, evaporation rate and erosion rate for different electrode materials are presented as a function of arc current, pressure of arc chamber, width of arc root and velocity of water coolant. Some experimental data on electrode erosion in a tubular plasma generator is given. The effects of operating parameters on erosion rate are discussed in detail. 展开更多
关键词 electrode erosion plasma generator bed transfer.
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Fabrication of hybrid Co_3O_4/NiCo_2O_4 nanosheets sandwiched by nanoneedles for high-performance supercapacitors using a novel electrochemical ion exchange
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作者 郝加新 彭尚龙 +7 位作者 秦天锋 王子磊 温昱祥 贺德衍 张加驰 张稚雅 范晓彦 曹国忠 《Science China Materials》 SCIE EI CSCD 2017年第12期1168-1178,共11页
Electrochemical ion exchange has been used to tailor the composition of transition metal oxides (Co3O4) electrode with enhanced capacity while maintaining its crystal structure and morphology. Specifically, Ni ions ... Electrochemical ion exchange has been used to tailor the composition of transition metal oxides (Co3O4) electrode with enhanced capacity while maintaining its crystal structure and morphology. Specifically, Ni ions were incorporated to C03O4 nanosheets sandwiched by nanoneedles to form Co3O4/NiCo2O4 composite. As positive electrode for supercapacitors, the Co3O4/NiCo2O4 composite presents a high areal capacitance of 3.2 F cm^-2 (1060 F g^-1) at a current density of 5 mA cm^-2 and outstanding rate capability as well as long cycle stability. Moreover, the assembled aqueous asymmetric supercapacitor based on Co3O4/NiCo2O4//carbon cloth electrodes delivers a considerable energy density of 3.0 mW hcm^-3 at power density of 136 mW cm^-3, and high rate capability (85% retention at a current density of 30 mA cm^-2). A safety light composed of ten green LEDs in parallel was lit for -360 s using two identical supercapacitors in series, indicating a promising practical application. 展开更多
关键词 electrochemical ion exchange cobalt oxide nickel cobalt oxide asymmetric supercapacitors
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Controlled growth of Cu_3Se_2 nanosheets array counter electrode for quantum dots sensitized solar cell through ion exchange 被引量:3
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作者 Huiwen Bai Ting Shen +3 位作者 Shixun Wang Bo Li Guozhong Cao Jianjun Tian 《Science China Materials》 SCIE EI CSCD 2017年第7期637-645,共9页
Copper selenide (CurSe) has great potential as counter electrode for quantum dots sensitized solar cell (QDSSC) due to its excellent electrocatalytic activity and lower charge transfer resistance. A novel ion exch... Copper selenide (CurSe) has great potential as counter electrode for quantum dots sensitized solar cell (QDSSC) due to its excellent electrocatalytic activity and lower charge transfer resistance. A novel ion exchange method has been utilized to fabricate Cu3Se2 nanosheets array counter electrode. CdS layer was first deposited by sputtering and used as a template to grow compact and uni- form Cu3Se2 film in a typical chemical bath. The morphology and thickness of the Cu3Se2 nanosheets were controlled by the deposition time. The final products (2h-Cu3Se2) showed significantly improved electrochemical catalytic activity and carrier transport property, leading to a much increased power conversion efficiency (4.01%) when compared with the CuS counter electrode CdS/CdSe QDSSC (3.21%). 展开更多
关键词 Cu3Se2 counter electrode quantum dots sensitizedsolar cell ion exchange
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Characterization of different plasma-treated cobalt oxide catalysts for oxygen reduction reaction in alkaline media 被引量:2
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作者 Lisa M.Uhlig Gustav Sievers +2 位作者 Volker Brüser Alexander Dyck Gunther Wittstock 《Science Bulletin》 SCIE EI CAS CSCD 2016年第8期612-618,共7页
Plasma-synthesized cobalt oxide supported on carbon has been analyzed for its use for electrocatalytic oxygen reduction reaction (ORR) in alkaline anion exchange membrane fuel cells (AEMFC). This work presents the... Plasma-synthesized cobalt oxide supported on carbon has been analyzed for its use for electrocatalytic oxygen reduction reaction (ORR) in alkaline anion exchange membrane fuel cells (AEMFC). This work presents the ORR activity in 0.1 mol L-1 KOH and 0.1 tool L-1 K2CO3 at 25 ℃. Cyclic voltammetry (CV) was used to determine the potentials at which the ORR occurs and to evaluate the stability of catalyst. Moreover, a rotating ring-disk electrode (RRDE) was used to investigate the activity of the catalysts and the formation of the by-product hydroperoxide anion (HO2-) as well as to identify the preferred pathway of the ORR. Calculated kinetic parameters for the ORR for the cobalt catalysts are shown in this work together with a comparison to a commercial platinum catalyst. However, the cobalt oxide produced more by-products which could lead to damage of the membrane in a fuel cell through a radical attack of the polymer backbone. 展开更多
关键词 Oxygen reduction reaction Alkalinemedia - Electrocatalytic activity RRDE Cobaltcatalyst Alkaline fuel cell
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