Ultrathin Cu-MOF@δ-MnO2 nanosheets for aqueous electrolyte-based high-voltage electrochemical capacitors

Jing Xu, Yan Wang, Shuai Cao, Jian Zhang, Guangxun Zhang, Huaiguo Xue, Qiang Xu* and Huan Pang*

School of Chemistry and Chemical Engineering, Yangzhou University

With increasing demand for energy storage, obtaining aqueous electrolytes that are incombustible, low cost, and conveniently assembled in air with high ionic conductivity has become a dominant focus. Herein, we report the successful synthesis of ultrathin Cu-MOF@δ-MnO2 nanosheets in a controllable way for 2.0 V aqueous electrolyte-based electrochemical capacitors that involve activated carbon. From electrochemical performance tests, the electrode results in a large increase in the performance of an asymmetric supercapacitor, which involves activated carbon, in an operating voltage window from 0 V to 2.0 V in aqueous electrolyte, with a high specific capacitance of 340 F g-1 at a current density of 1.0 A g-1, and cycling stability for 6000 cycles with only a 5% drop in the initial capacitance. The superior performance during the charging-discharging process is attributed to the existence of a film, which can prevent electronic conduction while allowing ionic conduction.

J. Mater. Chem. A, 2018, DOI:10.1039/C8TA05976D;IF=9.931, SCI

链接:http://dx.doi.org/10.1039/C8TA05976D