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首页> 外文期刊>RSC Advances >Electrochemical performance of an asymmetric supercapacitor based on graphene and cobalt molybdate electrodes
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Electrochemical performance of an asymmetric supercapacitor based on graphene and cobalt molybdate electrodes

机译：基于石墨烯和钼酸钴电极的不对称超级电容器的电化学性能

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摘要

In this article, we report the fabrication and electrochemical performance of asymmetric supercapacitors (ASCs) based on a reduced graphene oxide (rGO) negative electrode and a cobalt molybdate (CoMoO4) positive electrode. The rGO and CoMoO4 electrode materials were synthesized by hydrothermal and sonochemical methods, respectively. Physico-chemical characterization techniques such as X-ray diffraction, field-emission scanning electron microscopy, Fourier-transform infrared spectroscopy, Raman spectroscopy, and nitrogen adsorption-desorption isotherm analysis were used to characterize the electrode materials. The rGO nanosheets and CoMoO4 nanostructures delivered a specific capacitance of about 168.8 and 98.34 F g(-1), respectively measured in a three electrode system. The rGO parallel to CoMoO4 ASC device demonstrated a maximum specific capacitance of 26.16 F g(-1) (at a current density of 0.5 mA cm(-2)), an energy density of 8.17 W h kg(-1), and a maximum working voltage of 1.5 V. The fabricated device possessed excellent capacitance retention of about 85% after 4000 cycles (at a current density of 1.0 mA cm(-2)) suggesting the superior cyclic stability of the fabricated ASC device.
机译：在本文中，我们报告了基于还原氧化石墨烯（rGO）负极和钼酸钴（CoMoO4）正极的不对称超级电容器（ASC）的制备和电化学性能。分别通过水热法和声化学法合成了rGO和CoMoO4电极材料。 X射线衍射，场发射扫描电子显微镜，傅里叶变换红外光谱，拉曼光谱和氮吸附-解吸等温线分析等物理化学表征技术用于表征电极材料。 rGO纳米片和CoMoO4纳米结构分别在三电极系统中测得的比电容分别约为168.8和98.34 F g（-1）。平行于CoMoO4 ASC器件的rGO的最大比电容为26.16 F g（-1）（在0.5 mA cm（-2）的电流密度下），8.17 W h kg（-1）的能量密度和最大工作电压为1.5V。制造的器件在4000次循环后（在1.0 mA cm（-2）的电流密度下）具有约85％的出色电容保持率，表明制造的ASC器件具有出色的循环稳定性。

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