Journal
ELECTROCHIMICA ACTA
Volume 341, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.135988
Keywords
NiCoP/CoP heterointerface; N-doped carbon nanotubes; Porous nanosheets; High-rate; Hybrid supercapacitors
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Funding
- Natural Science Foundation of Hunan Province, China [2018JJ3041]
- National Natural Science Foundation of China [51702095, 11574078, 51374238]
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Rational design of highly active electrode materials made of low-cost and earth-abundant transition metal phosphides is essential to boost the energy density and overall performance of electrochemical capacitors. In this work, homologous 3D NiCoP/CoP hetero-nanosheets network supported on N-doped carbon nanotubes are synthesized through one-step phosphorization of nickel cobalt hydroxide. The synergistic effects between NiCoP and CoP in the heterointerface are studied systematically through tuning the molar ratio of original Ni/Co. As a result, the optimized N-CNTs@NiCoP/CoP (with the Ni/Co ratio of 1:2) reveals a remarkable specific capacity of 152 mAh g(-1) at 1 A g(-1) and a superior rate capability with a capacity retention of 61% even at 30 A g(-1). A hybrid supercapacitor assembled with N-CNTs@NiCoP/CoP cathode and ZIF-67-derived porous carbon anode exhibits a high energy density of 45.5 Wh kg(-1) at power density of 784 W kg(-1) and excellent stability of 87% retention after 10,000 cycles at 12 A g(-1). Such excellent electrochemical performance of N-CNTs@NiCoP/CoP is mainly ascribed to the strong synergistic effect between NiCoP and CoP in their heterojunctions, enlarged surface area and active sites due to the 3D nanosheets network and conductive N-CNTs support. (C) 2020 Elsevier Ltd. All rights reserved.
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