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3D Macro-Micro-Mesoporous FeC2O4/Graphene Hydrogel Electrode for High-Performance 2.5 V Aqueous Asymmetric Supercapacitors
闫立峰
Author NameAffiliationE-mail
闫立峰 中国科学技术大学化学物理系 lfyan@ustc.edu.cn 
Abstract:
Distinguished from commonly used Fe2O3 and Fe3O4, a three-dimensional multilevel macro-micro-mesoporous structure of FeC2O4/graphene composite has been prepared as binder-free electrode for supercapacitors. The as-prepared materials are composed of macroporous graphene and microporous/mesoporous ferrous oxalate. Generally, the decomposition voltage of water is 1.23 V and the practical voltage window limit is about 2 V for asymmetric supercapacitors in aqueous electrolytes. When FeC2O4/rGO hydrogel was used as the negative electrode and a pure rGO hydrogel was used as the positive electrode, the asymmetrical supercapacitor voltage window raised to 1.7 V in KOH (1.0 M) electrolyte and reached up to 2.5 V in a neutral aqueous Na2SO4 (1.0 M) electrolyte. Correspondingly it also exhibits a high performance with an energy density of 59.7 Wh kg-1. By means of combining a metal oxide that owns micro-mesoporous structure with graphene, this work provides a new opportunity for preparing high-voltage aqueous asymmetric supercapacitors without addition of conductive agent and binder.
Key words:  asymmetric supercapacitors, high-voltage supercapacitors, 3D macro-micro–mesoporous, FeC2O4/rGO hydrogel
FundProject:
3D多孔FeC2O4/石墨烯电极用于高性能2.5V水系非对称超级电容器
闫立峰
摘要:
不同于常用的Fe2O3和Fe3O4,我们制备了三维多孔结构FeC2O4/石墨烯复合材料在不添加粘结剂时可作为超级电容器电极。复合材料由大孔石墨烯和微介孔FeC2O4组成。通常,水分解电压为1.23V,对于以水系为电解液的不对称超级电容器,电压窗口限制为2V。当以FeC2O4/ rGO水凝胶作为负极,以纯rGO水凝胶作为正极时,在KOH(1.0M)电解质中不对称超级电容器电压窗为1.7 V在中性Na2SO4 (1.0M)电解质中可达到2.5V,相应地,组装的非对称电容器性能优异,能量密度为59.7 Wh kg-1。这项工作通过将具有微介孔结构的金属氧化物与石墨烯相结合,制备在不添加导电剂和粘合剂时直接用于组装不对称超级电容器的电极材料。
关键词:  非对称超级电容器,高电压窗口,3D微孔介孔结构,FeC2O4/rGO水凝胶
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