A self-supporting P-doped CNT@MnCo2O4/Co3O4 electrode with ion and electron-conductive hierarchical structure for high performance supercapacitor
Journal of Alloys and Compounds(2023)
摘要
It is an important method to enhance the electrochemical performance of metal oxide electrode by phosphorus doping in the research of high-performance hybrid supercapacitors. Herein, we obtain a P -doped carbon nanotubes (CNT)@MnCo2O4/Co3O4 film by an in-situ synthesis and subsequent phosphating. By introducing P heteroatoms, the electronic structure of MnCo2O4/Co3O4 can be effectively modulated, thereby improving the electrical conductivity and increasing Faraday reaction. The electrochemical tests show that the capacity and rate performance of CNT@MnCo2O4/Co3O4 have been significantly improved after phosphorus doping. The P-CNT@MnCo2O4/Co3O4 electrode displays an acceptable specific capacitance of 1064.4 F g(-1). Furthermore, a supercapacitor P-CNT@MnCo2O4/Co3O4//activated carbon possesses 46.4 W h kg(-1) of energy density at 800 W kg(-1). After 10000 repeated tests, the device keeps 85.0 % of the original capacitance. The above results show that the P-doped CNT/metal oxide film we designed has some inspiration on the design of energy storage electrode materials. (c) 2023 Elsevier B.V. All rights reserved.
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关键词
Supercapacitor,Film,Energy density,Self-supporting electrode
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