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In Situ Growth of Core–Shell Heterostructure CePO4@CuCo2S4 As Advanced Electrodes for High-Performance Supercapacitor

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journal contribution
posted on 2021-09-03, 12:39 authored by Yunyun Wang, Ya Xie, Tianyu Han, Hong Zhang, Kaikai Duan, Jia Wen, Xing Huang, Jibo Jiang, Sheng Han
The design of multicomponent core–shell heterostructures is considered to be an efficacious way to develop excellent performance supercapacitor electrode materials. A new strategy CePO4@CuCo2S4 core–shell heterogeneous structure is devised by preparing porous CePO4 nanosheets as cores via hydrothermal reaction and solid-state phosphating methods and electrochemically deposited CuCo2S4 nanosheets as shells. Binder-free three-dimensional (3D) porous CePO4@CuCo2S4 nanosheets grown on foam nickel substrate can provide an ordered porous nanoframe, promote electrode/ion transport, and generate the effective synergy of good conductivity from CePO4 and excellent redox activity from CuCo2S4. As a consequence, the CePO4@CuCo2S4 electrode exhibits an outstanding specific capacitance (2897.8 F g–1 at 0.5 A g–1), a superb capacity retention rate (70.1% at 20 A g–1), and excellent cycle stability (after 10,000 cycles or maintain 94.4%), superior to those of bare CePO4 and CuCo2S4 electrodes. In addition, an asymmetric hybrid supercapacitor is assembled by CePO4@CuCo2S4 and activated carbon, when the energy density is 80.4 Wh kg–1 and the corresponding power density is 799.5 W kg–1.