Boosting specific capacitance of Mo-Co-(S,O) electrode via a synergistic optimization strategy

作者：Xiao, Ting^*; Wang, Zhixin; Jiang, Tao; Yao, Yushuai; Jiang, Lihua; Xiang, Peng; Chen, Weifeng; Ni, Shibing; Tao, Fujun; Tan, Xinyu^*

来源：Journal of Alloys and Compounds, 2023, 960: 171002.

DOI：10.1016/j.jallcom.2023.171002

• Mo-Co-(S
• O)
• P doping
• Constant-current-charge activation
• High specific capacitance
• High current density

Low electrical conductivity and insufficient active sites of Co-based binary metal oxides or sulfides hamper their practical specific capacitance especially at high current densities. In the current work, we provide a novel synergistic optimization strategy including P doping and constant-current-charge activation (CA) to greatly improve the specific capacitance of sulfur and oxygen-containing Mo-Co binary compounds (Mo-Co(S,O)) electrode. The synergistic effect of the P doping and activation not only increases the electrical conductivity but also improves the electroactive sites. As a result, the optimized Mo-Co-(S,O)/P-CA electrode shows exceptional specific capacitance (& SIM;9.64 F cm-2/2931 F g-1 at 12.5 mA cm-2), approximately 20 times the pristine Mo-Co-(S,O). Moreover, an asymmetric supercapacitor prepared with Mo-Co-(S,O)/P-CA cathode and conductive carbon cloth achieves a high energy density of 0.61 mWh cm-2 at a power density of 4.25 mW cm-2, and outstanding cyclic performance with 121.6% of capacitance retention after 12,000 cycles.