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Alloyed Pt-Sn nanoparticles on hierarchical nitrogen-doped carbon nanocages for advanced glycerol electrooxidation
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作者 Jietao Jiang Liqi Zhou +7 位作者 fengfei xu Guanghai Chen Xiaoyu Liu Zhen Shen Lijun Yang Qiang Wu Xizhang Wang Zheng Hu 《Nano Research》 SCIE EI CSCD 2024年第5期4055-4061,共7页
Glycerol is an alternative sustainable fuel for fuel cells,and efficient electrocatalyst is crucial for glycerol oxidation reaction(GOR).The promising Pt catalysts are subject to the inadequate capability of C-C bond ... Glycerol is an alternative sustainable fuel for fuel cells,and efficient electrocatalyst is crucial for glycerol oxidation reaction(GOR).The promising Pt catalysts are subject to the inadequate capability of C-C bond cleavage and the susceptibility to poisoning.Herein,Pt-Sn alloyed nanoparticles are immobilized on hierarchical nitrogen-doped carbon nanocages(hNCNCs)by convenient ethylene glycol reduction and subsequent thermal reduction.The optimal Pt_(3)Sn/hNCNC catalyst exhibits excellent GOR performance with a high mass activity(5.9 A·mg_(Pt)^(-1)),which is 2.7 and 5.4 times higher than that of Pt/hNCNC and commercial Pt/C,respectively.Such an enhancement can be mainly ascribed to the increased anti-poisoning and C-C bond cleavage capability due to the Pt_(3)Sn alloying effect and Sn-enriched surface,the high dispersion of Pt_(3)Sn active species due to N-participation,as well as the high accessibility of Pt_(3)Sn active species due to the three-dimensional(3D)hierarchical architecture of hNCNC.This study provides an effective GOR electrocatalyst and convenient approach for catalyst preparation. 展开更多
关键词 Pt_(3)Sn alloy hierarchical nitrogen-doped carbon nanocages glycerol electrooxidation anti-poisoning C-C bond cleavage
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Self-supported NiFe-LDH nanosheets on NiMo-based nanorods as high-performance bifunctional electrocatalysts for overall water splitting at industrial-level current densities
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作者 Yan Zhang Biao Feng +9 位作者 MingLei Yan Zhen Shen Yiqun Chen Jingyi Tian fengfei xu Guanghai Chen Xizhang Wang Lijun Yang Qiang Wu Zheng Hu 《Nano Research》 SCIE EI CSCD 2024年第5期3769-3776,共8页
Efficient,durable and economic electrocatalysts are crucial for commercializing water electrolysis technology.Herein,we report an advanced bifunctional electrocatalyst for alkaline water splitting by growing NiFe-laye... Efficient,durable and economic electrocatalysts are crucial for commercializing water electrolysis technology.Herein,we report an advanced bifunctional electrocatalyst for alkaline water splitting by growing NiFe-layered double hydroxide(NiFe-LDH)nanosheet arrays on the conductive NiMo-based nanorods deposited on Ni foam to form a three-dimensional(3D)architecture,which exhibits exceptional performances for both hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).In overall water splitting,only the low operation voltages of 1.45/1.61 V are required to reach the current density of 10/500 mA·cm^(-2),and the continuous water splitting at an industrial-level current density of 500 mA·cm^(-2) shows a negligible degradation(1.8%)of the cell voltage over 1000 h.The outstanding performance is ascribed to the synergism of the HER-active NiMo-based nanorods and the OER-active NiFe-LDH nanosheet arrays of the hybridized 3D architecture.Specifically,the dense NiFe-LDH nanosheet arrays enhance the local pH on cathode by retarding OH-diffusion and enlarge the electrochemically active surface area on anode,while the conductive NiMo-based nanorods on Ni foam much decrease the charge-transfer resistances of both electrodes.This study provides an efficient strategy to explore advanced bifunctional electrocatalysts for overall water splitting by rationally hybridizing HER-and OER-active components. 展开更多
关键词 alkaline water splitting bifunctional electrocatalysts layered double hydroxides high durability industrial current densities
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Reactive oxygen species(ROS)-responsive size-reducible nanoassemblies for deeper atherosclerotic plaque penetration and enhanced macrophage-targeted drug delivery 被引量:6
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作者 Jianhua He Wenli Zhang +7 位作者 Xiaoju Zhou fengfei xu Jiahui Zou Qiqi Zhang Yi Zhao Hongliang He Hu Yang Jianping Liu 《Bioactive Materials》 SCIE CSCD 2023年第1期115-126,共12页
Nanoparticle-based therapeutics represent potential strategies for treating atherosclerosis;however,the complex plaque microenvironment poses a barrier for nanoparticles to target the dysfunctional cells.Here,we repor... Nanoparticle-based therapeutics represent potential strategies for treating atherosclerosis;however,the complex plaque microenvironment poses a barrier for nanoparticles to target the dysfunctional cells.Here,we report reactive oxygen species(ROS)-responsive and size-reducible nanoassemblies,formed by multivalent host-guest interactions betweenβ-cyclodextrins(β-CD)-anchored discoidal recombinant high-density lipoprotein(NP^(3)_(ST))and hyaluronic acid-ferrocene(HA-Fc)conjugates.The HA-Fc/NP^(3)_(ST)nanoassemblies have extended blood circulation time,specifically accumulate in atherosclerotic plaque mediated by the HA receptors CD44 highly expressed in injured endothelium,rapidly disassemble in response to excess ROS in the intimal and release smaller NP^(3)_(ST),allowing for further plaque penetration,macrophage-targeted cholesterol efflux and drug delivery.In vivo pharmacodynamicses in atherosclerotic mice shows that HA-Fc/NP^(3)_(ST)reduces plaque size by 53%,plaque lipid deposition by 63%,plaque macrophage content by 62%and local inflammatory factor level by 64%compared to the saline group.Meanwhile,HA-Fc/NP^(3)_(ST)alleviates systemic inflammation characterized by reduced serum inflammatory factor levels.Collectively,HA-Fc/NP^(3)_(ST)nanoassemblies with ROS-responsive and size-reducible properties exhibit a deeper penetration in atherosclerotic plaque and enhanced macrophage targeting ability,thus exerting effective cholesterol efflux and drug delivery for atherosclerosis therapy. 展开更多
关键词 ATHEROSCLEROSIS MACROPHAGE Reactive oxygen species Size-reducible nanoassemblies Recombinant high-density lipoprotein
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Solidification in a shell-and-tube thermal energy storage unit filled with longitude fins and metal foam:A numerical study 被引量:1
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作者 Xiaohu Yang fengfei xu +2 位作者 Xinyi Wang Junfei Guo Ming-Jia Li 《Energy and Built Environment》 2023年第1期64-73,共10页
In this study,an innovative thermal energy storage design method was developed by adding the combination of metal foam and fin to phase change materials(PCMs).A numerical model was built and verified based on the comp... In this study,an innovative thermal energy storage design method was developed by adding the combination of metal foam and fin to phase change materials(PCMs).A numerical model was built and verified based on the comparison among the present model prediction,experimental measurements,and numerical results in open lit-erature.To highlight the novel design method,four cases including fin-PCM,foam-PCM,fin-foam-PCM,and PCM unit were compared by means of solidification features.The temperature distribution,solidification front propa-gation,and buoyancy-induced convection in the liquid PCM were accounted for.Numerical results demonstrated that metal foam outperformed fin regarding the improvement on solidification phase change.The combination of foam and fin achieved the best performance,leading to a 90.5%reduction in complete energy release time in comparison with the PCM unit.The proposed design method provided reference potentials for advancing energy storage engineering.However,buoyancy-induced convection in the liquid PCM before solidification was harmful to the formation of solidification front and its movement.A maximal 11.5%prolonging time for the complete solidification was found. 展开更多
关键词 Thermal energy storage Phase change materials Metal foam Shell and tube heat exchanger SOLIDIFICATION
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Lipid-Based Intelligent Vehicle Capabilitized with Physical and Physiological Activation
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作者 Fuxue Zhang Bozhang Xia +12 位作者 Jiabei Sun Yufei Wang Jinjin Wang fengfei xu Junge Chen Mei Lu Xin Yao Peter Timashev Yuanyuan Zhang Meiwan Chen Jing Che Fangzhou Li Xing-Jie Liang 《Research》 SCIE EI CSCD 2023年第2期275-295,共21页
Intelligent drug delivery system based on “stimulus-response”mode emerging a promising perspective in next generation lipidbased nanoparticle.Here,we classify signal sources into physical and physiological stimulati... Intelligent drug delivery system based on “stimulus-response”mode emerging a promising perspective in next generation lipidbased nanoparticle.Here,we classify signal sources into physical and physiological stimulation according to their origin. 展开更多
关键词 classify LIPID Intelligent
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