中文

Controllable Fabrication and Tuned Electrochemical Performance of Potassium Co–Ni Phosphate Microplates as Electrodes in Supercapacitors

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  • Release time:2021-02-28

  • Impact Factor:8.758

  • DOI number:10.1021/acsami.7b14552

  • Journal:ACS APPLIED MATERIALS & INTERFACES

  • Key Words:ENERGY-STORAGE DEVICES; CAPACITORS; FOAM; EVOLUTION; CATALYSTS; CRYSTAL; GROWTH; ARRAYS; OXIDE

  • Abstract:Most reported pristine phosphates, such as NH4MPO4 center dot H2O (M = Co, Ni), are not very stable as supercapacitor electrodes because of their chemical properties. In this work, KCoxNi1-xPO4 center dot H2O microplates were fabricated by a facile hydrothermal method at low temperature and used as electrodes in supercapacitors. The Co and Ni content could be adjusted, and optimal electrochemical performance was found in KCo0.33Ni0.67PO4 center dot H2O, which also possessed superior specific capacitance, rate performance, and long-term chemical stability compared with NH4Co0.33Ni0.67PO4 center dot H2O because of its unique chemical composition and microstructure. Asymmetric supercapacitor cells based on KCo0.33Ni0.67PO4 center dot H2O and active carbon were assembled, which produce specific capacitance of 34.7 mA h g(-1) (227 F g(-1)) under current density of 1.5 A g(-1) and retain 82% as initial specific capacitance after charging and discharging approximately 5000 times. The assembled asymmetric supercapacitor cells (ASCs) exhibited much higher power and energy density than most previously reported transition metal phosphate ASCs. The KCoxNi1-xPO4 center dot H2O electrodes fabricated in this work are efficient, inexpensive, and composed of naturally abundant materials, rendering them promising for energy storage device applications.

  • Indexed by:Journal paper

  • Volume:10

  • Page Number:3506-3514

  • Translation or Not:no

  • Date of Publication:2018-01-31

  • Included Journals:SCI


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