Battery-like supercapacitors from diamond networks and water-soluble redox electrolytes
Battery-like supercapacitors from diamond networks and water-soluble redox electrolytes
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DOI：
10.1039/c6ta08607a
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发表时间：
2017-01
影响因子：
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通讯作者：
Siyu Yu;N. Yang;Zhuang Hao;S. Mandal;O. Williams;Bingping Yang;N. Huang;Xin Jiang
中科院分区：
文献类型：
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作者：
Siyu Yu;N. Yang;Zhuang Hao;S. Mandal;O. Williams;Bingping Yang;N. Huang;Xin Jiang
提高电化学电容器的性能可以通过更大的电容以及更高的功率和能量密度来实现。在这项工作中，这种类似电池的超级电容器是用三维导电金刚石网络作为电容器电极，水溶性氧化还原偶作为电解质制成的。在0.05 M Fe(CN)63−/4−+ 1.0 M Na2SO4水溶液中，当电流密度为1 mA cm−2时，电容量为73.42 mF cm−2。该值比金刚石双电层电容器（edlc）的电容高10000倍。制备的金刚石网络对称伪电容器的能量和功率密度分别高达56.50 W h kg - 1和13.7 kW kg - 1。与相同电池电压下获得的金刚石edlc相比，它们分别增强了约3500倍和1440倍。因此，金刚石网络和水溶性氧化还原电解质的结合是构建电化学电容器的一种新方法，从而弥补了普通介电电容器和可充电电池之间的差距。
Enhanced performance of electrochemical capacitors can be achieved by larger capacitances as well as higher power and energy densities. In this work, such battery-like supercapacitors were fabricated using a three-dimensional and conductive diamond network as the capacitor electrode and water-soluble redox couples as the electrolyte. In 0.05 M Fe(CN)63−/4− + 1.0 M Na2SO4 aqueous solution, a capacitance of 73.42 mF cm−2 was obtained at a current density of 1 mA cm−2. This value is 10 000 times higher than the capacitance of diamond electric double layer capacitors (EDLCs). The energy and power densities of a fabricated diamond network symmetric pseudocapacitor were up to 56.50 W h kg−1 and 13.7 kW kg−1, respectively. Compared with those of diamond EDLCs obtained with the same cell voltage, they are enhanced about 3500 and 1440 fold, respectively. Therefore the combination of diamond networks and water-soluble redox electrolytes is a novel approach to construct electrochemical capacitors and thus bridges the gap between normal dielectric capacitors and rechargeable batteries.