Journal
ELECTROCHIMICA ACTA
Volume 364, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.137063
Keywords
Zn-Co phosphide nanosheets; Battery-type material; High energy density; DFT calculation; Alkaline supercapacitors
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Funding
- National Natural Science Foundation of China [21566030]
- Ministry of Science and Technology China-South Africa Joint Research Program [CS08L15]
- Project of Inner Mongolia Education Department [NJZY089]
- Natural Science Foundation of Inner Mongolia [2015MS0205]
- creative talents team of Prairie Talent engineering industry
- Prairie Talent of organization Department of Inner Mongolia Party Committee
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Excellent electrode materials are often desired to improve the overall performance of supercapacitors and conversion components, especially electrode materials synthesized by anion replacement to achieve high electrochemical performance. Herein, a zinc-cobalt phosphide electrode material with excellent electrical conductivity is synthesized through a metal-organic framework (MOF)-derived method, followed by phosphating in a tube furnace. As a result, an exchange of phosphorus ions and oxygen ions occurs, yielding a high specific capacitance of 2115.5 F g(-1) at 1 A g(-1) , as well as a superior rate capacity of 1086.5 F g(-1) at 50 A g(-1) . After 7000 cycle tests, 80.3% of the initial specific capacitance is maintained. Phosphorus substitution leads to a narrowed band gap, resulting in outstanding electrical conductivity, as confirmed through density functional theory (DFT) calculations. Subsequently, the self-assembled Zn0.33Co0.67P//Bi2O3 alkaline supercapacitor exhibits a high energy density of 83.05 Wh kg(-1) (248.9 F g(-1) at 1 A g(-1) ) at a power density of 775.02 W kg(-1) . Meanwhile, a capacitance retention of 84.6% after 8000 cycles at a current density of 5 A g(-1) is obtained. The outstanding performances of the electrode material in terms of electrical conductivity and electrochemical activity provide a new method for the design of high energy density alkaline supercapacitors (SCs). (C) 2020 Elsevier Ltd. All rights reserved.
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