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离子的胶体状态与其电化学储能极限 被引量:4
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作者 陈昆峰 薛冬峰 《应用化学》 CAS CSCD 北大核心 2018年第9期1067-1075,共9页
阳离子氧化还原化学是电化学储能技术中最核心的储能机理,如何高效快速利用氧化还原活性阳离子是发展兼具高功率密度与高能量密度储电技术的关键。处于胶体状态的阳离子可形成热力学平衡态和非平衡态,具有高反应活性和低离子迁移势垒,... 阳离子氧化还原化学是电化学储能技术中最核心的储能机理,如何高效快速利用氧化还原活性阳离子是发展兼具高功率密度与高能量密度储电技术的关键。处于胶体状态的阳离子可形成热力学平衡态和非平衡态,具有高反应活性和低离子迁移势垒,展现出独特的电化学特性。本文着重介绍氧化还原活性阳离子的胶体状态与其在电化学储能上的应用,并从热力学和动力学方面阐述其储能机理,以及活性胶体离子电极和超级电容电池的构筑。利用胶体的高比表面积、高离子吸附能力和荷电离子梯度分布等特性,创造性地构筑胶体超级电容电池,解决了现有电化学储能电极材料体系中高容量与高功率不能兼具的问题,同时开拓了胶体体系新的应用方向。 展开更多
关键词 氧化还原离子 超级容器 化学储能 电活性胶体
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Rare earth and transitional metal colloidal supercapacitors 被引量:12
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作者 CHEN KunFeng XUE DongFeng 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2015年第11期1768-1778,共11页
The search of electrode materials with high electrochemical activity is one of key solutions to actualize both high energy density and high power density in a supercapacitor. Recently, we have developed one novel kind... The search of electrode materials with high electrochemical activity is one of key solutions to actualize both high energy density and high power density in a supercapacitor. Recently, we have developed one novel kind of rare earth and transitional metal colloidal supercapacitors, which can deliver higher specific capacitance than electrical double-layer capacitors(EDLC) and traditional pseudocapacitors. The electrode materials in colloidal supercapacitors are in-situ formed electroactive colloids, which were transformed from commercial rare earth and transitional metal salts in alkaline electrolyte by chemical and electrochemical assisted coprecipitation. In these colloidal supercapacitors, multiple-electron Faradaic redox reactions can be utilized, which can deliver ultrahigh specific capacitance often larger than one-electron capacitance. Multiple-valence metal cations used in our designed colloidal supercapacitors mainly include Ce3+, Yb3+, Er3+, Fe3+, Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Sn2+ and Sn4+. The colloidal supercapacitors can be served as the promising next-generation high performance supercapacitors. 展开更多
关键词 SUPERCAPACITOR colloidal electrode electroactive cation rare earth cation transitional metal cation
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Microcapsules with compact wall from hydrocarbon/fluorocarbon composite surfactants for electrophoretic display
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作者 DAI RunYing WU Gang CHEN HongZheng 《Science China Chemistry》 SCIE EI CAS 2011年第2期385-391,共7页
The components and their concentration ratio of surfactant mixture in aqueous solution of gelatin and sodium carboxymethylcellulose (NaCMC) are very important during the preparation of stable microcapsules for electro... The components and their concentration ratio of surfactant mixture in aqueous solution of gelatin and sodium carboxymethylcellulose (NaCMC) are very important during the preparation of stable microcapsules for electrophoretic display.In this work,hydrocarbon/fluorocarbon composite surfactant was introduced for the first time into the capsule wall to improve the chemical resistance and barrier property of the microcapsules.By investigating surface tension and zeta potential of NaCMC with the mixture of sodium dodecyl sulfate (SDS)/perfluoro-nonene oxy benzene sulfonate (OBS),we found that both the presence of hydrophobic interaction and the hydrogen bonding between NaCMC and SDS/OBS enhanced the adsorption of NaCMC at the oil/water interface and thus facilitated the formation of capsule wall.The morphology,particle size,surface free energy and thermal stability of the obtained microcapsules were characterized.The results showed that optically transparent microcapsules with uniform size,smooth surface and compact wall can be obtained by adjusting the pH value of the reaction system and the concentration ratio of SDS/OBS.Based on the prepared microcapsules,a matrix display prototype operated at 9 V direct current in static driven mode was fabricated. 展开更多
关键词 MICROCAPSULES compact wall sodium carboxymethylcellulose sodium dodecyl sulfate/perfluoro-nonene oxy benzene sulfonate composite surfactant electrophoretic display
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