Guo Dongfang, Li Zijiong, Wang Dianzhang, Sun Min, Wang Haiyan
Henan Key Laboratory of Magnetoelectronic Information Functional Materials, Zhengzhou University of Light Industry, 450002, Zhengzhou, P. R. China.
ChemSusChem. 2021 May 20;14(10):2205-2215. doi: 10.1002/cssc.202100285. Epub 2021 Apr 14.
Zinc ion capacitors (ZICs) composed of capacitor-type cathodes and battery-type anodes have attracted widespread attention thanks to the huge potential in the next generation of low-cost energy-storage devices. It is a challenge to explore a universal anode for aqueous ZICs with high-efficiency energy-storage characteristics. In this work, the double-transition-metal composite Co Ni P/reduced graphene oxide (rGO) with sufficient electrochemical activity and charge-transfer kinetics was successfully synthesized. The Zn@CoNiP/rGO anode obtained by zinc-ion activation and a biomass-derived porous carbon cathode (PC) were assembled into an aqueous ZIC (CNP-ZIC) in 2 m ZnSO . Finally, the CNP-ZIC reveals excellent energy and power densities with a working potential range of 0.2-1.9 V. CNP-ZICs shows high capacitance of up to 356.6 F g at 0.5 A g (based on the mass of active material on the PC cathode), which is far superior to the performance of conventional asymmetric energy storage devices (CoNiP/rGO//PC and Co P/rGO//PC). The CNP-ZIC exhibits both a very high energy density of 143.14 Wh kg and good cycling life (∼92.2 % retention after 10000 charge-discharge cycles at 7.5 A g ). There is no doubt that this work provides a promising strategy for assembling novel zinc ion hybrid supercapacitors with high efficiency and stable output.
由电容型阴极和电池型阳极组成的锌离子电容器（ZICs），因其在下一代低成本储能设备中的巨大潜力而受到广泛关注。探索一种具有高效储能特性的水系ZICs通用阳极是一项挑战。在这项工作中，成功合成了具有足够电化学活性和电荷转移动力学的双过渡金属复合材料CoNiP/还原氧化石墨烯（rGO）。通过锌离子活化得到的Zn@CoNiP/rGO阳极和生物质衍生的多孔碳阴极（PC）在2 m ZnSO₄中组装成水系ZIC（CNP-ZIC）。最后，CNP-ZIC在0.2 - 1.9 V的工作电位范围内展现出优异的能量和功率密度。CNP-ZICs在0.5 A g⁻¹时显示出高达356.6 F g⁻¹的高电容（基于PC阴极上活性材料的质量），这远远优于传统非对称储能器件（CoNiP/rGO//PC和CoP/rGO//PC）的性能。CNP-ZIC展现出143.14 Wh kg⁻¹的极高能量密度以及良好的循环寿命（在7.5 A g⁻¹下10000次充放电循环后保留率约为92.2%）。毫无疑问，这项工作为组装具有高效和稳定输出的新型锌离子混合超级电容器提供了一种有前景的策略。
