3D hierarchical CoWO4/Co3O4 nanowire arrays for asymmetric supercapacitors with high energy density

By Mingchang Zhang, H. Fan, Nan Zhao, Haijun Peng, Xiaohu Ren, Weijia Wang, Hua Li, Guangyu Chen, Y. Zhu, Xinbiao Jiang and 1 more. Chemical Engineering Journal, 2018

215 citations recorded by the source corpus.

Abstract A 3D hierarchical CoWO4/Co3O4 structure, with the synergetic effect of diverse materials, large specific surface area and fast transmission of electrons and ions is synthesized by a facile and efficient microwave hydrothermal method. We found that CoWO4 and 3D CoWO4/Co3O4 exhibit four pairs of redox peaks, which were discussed systematically. The hybrid electrode shows excellent specific capacitance of 1728 F g−1 at current density of 2.7 mA cm−2 (1 A g−1) with superior rate capability and satisfactory cycling stability (85.9% capacitance preserved after 5000 cycles). The asymmetric supercapacitors assembled with CoWO4/Co3O4 and activated carbon exhibit high energy density (57.8 Wh kg−1) and power density (6000 W kg−1 at 40.64 Wh kg−1), with remarkable cycle life. The above results indicate that the ordered CoWO4/Co3O4 nanowire arrays synthesized by this approach would be a promising candidate for practical application of high-performance supercapacitors.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/b62c066b282a3f15484804fc09be4b17cb7c2d37