Enhanced electrochemical supercapacitance of binder-free nanoporous ternary metal oxides/metal electrode
Enhanced electrochemical supercapacitance of binder-free nanoporous ternary metal oxides/metal electrode
复制标题
无粘结剂纳米多孔三元金属氧化物/金属电极的增强电化学超级电容
DOI：
10.1016/j.jcis.2016.03.028
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发表时间：
2016
影响因子：
9.9
通讯作者：
Wang Y.
中科院分区：
文献类型：
--
作者：
Gao J. J.;Qiu H. -J.;Wen Y. R.;Chiang F. -K.;Wang Y.
以Ni_8 Cu_（12）Mn_（80）单相前驱体为原料，采用化学脱合金法制备了高比表面积的自支撑纳米多孔Ni-Cu-Mn复合金属氧化物。电化学分析表明，首先由电化学氧化形成Cu和Mn基金属氧化物。随着循环次数的增加，Ni基氧化物生长的时间变晚，并与Cu/Mn氧化物混合，在金属韧带网络上形成相对稳定的混合金属氧化物薄膜。由于每种金属的不同电化学性质以及它们之间的协同效应，在金属纳米韧带上形成的混合三元金属氧化物在1.0 M KOH水溶液中作为独立的超级电容器电极测试时可以在宽电位窗口（1.5 V）之间稳定地操作。由于高的体积表面积、宽的操作电位窗口和优异的导电性，纳米多孔金属氧化物@金属复合材料表现出高的体积电容（10500 F cm-3）、高的能量密度（1038 mW h cm-3）和良好的循环稳定性。
Free-standing nanoporous Ni-Cu-Mn mixed metal oxides on metal with a high surface area was fabricated by chemically dealloying a Ni8Cu12Mn80single-phase precursor, followed by electrochemical oxidation in an alkaline solution. Electrochemical analysis shows that first Cu and Mn-based metal oxides formed by the electrochemical oxidation. Ni-based oxides grow later with the increase of electrochemical CV cycles and mix with the Cu/Mn oxides, forming a relatively stable mixed metal oxides thin film on metal ligament network. Due to the different electrochemical properties of each metal and the synergetic effect between them, the mixed ternary metal oxides formed on metal nano-ligament can operate stably between a wide potential window (1.5 V) in 1.0 M KOH aqueous solution when tested as a free-standing supercapacitor electrode. Due to the high volumetric surface area, wide operating potential window and excellent conductivity, the nanoporous metal oxides@metal composite exhibits a high volumetric capacitance (∼500 F cm−3), high energy density (∼38 mW h cm−3) and good cycling stability.