Co3O4/Zn-Co-Mo Nanomaterials and Their Applications in Supercapacitors and Electrocatalysis Hydrogen Evolution Reaction

作者：Miao, Fengjuan^*; Shi, Jinxin; Tao, Bairui^*; Zang, Yu; Chu, Paul K.

来源：Journal of the Electrochemical Society, 2022, 169(2): 023504.

DOI：10.1149/1945-7111/ac4f73

• FACILE SYNTHESIS
• CO3O4
• PERFORMANCE
• ARRAYS
• FOAM

Mixed transition metal compounds with abundant more active sites are attractive to supercapacitors and electrochemical water splitting. In this work, the Co3O4/Zn-Co-Mo/NF composite is prepared by a hydrothermal method and thermal annealing. The Zn-Co-Mo nanosheet arrays are synthesized on nickel foam (NF) to form a three-dimensional (3D) network to take advantage of the electrical conductivity and viscosity of NF. Co3O4 is produced directly in the 3D microchannels to achieve a large energy density and robust stability. In the test of the supercapacitor performance, the specific capacitance of Co3O4/Zn-Co-Mo/NF is 2169 F g(-1) at a current density of 1 A g(-1). In addition, excellent long-term cycling stability is observed as manifested by specific capacitance retention of 85% after 4,000 cycles at a current density of 25 A g(-1). As a catalyst in the hydrogen evolution reaction (HER), Co3O4/Zn-Co-Mo/NF shows an overpotential of 128 mV at 10 mA cm(-2). Our results confirm the dual functionality of the materials which have promising potential in energy storage and generation applications.