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Hydrothermal Synthesis of NiCo 2 O 4 /CoMoO 4 Nanocomposite as a High‐Performance Electrode Material for Hybrid Supercapacitors
Author(s) -
Guo Wei,
Wu Yueli,
Tian Yamei,
Lian Xiaojuan,
Li Jiyang,
Wang Shuang
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201901250
Subject(s) - supercapacitor , nanocomposite , materials science , capacitance , electrolyte , electrode , electrochemistry , hydrothermal circulation , chemical engineering , power density , nanotechnology , chemistry , power (physics) , physics , quantum mechanics , engineering
The hierarchical hollow NiCo 2 O 4 /CoMoO 4 hybrid composite was directly grown on Ni foam (NF) under hydrothermal conditions at 110–140 °C for different growth times. This robust hollow structure benefits from a weakly alkaline environment provided by tetramethyl ammonium hydroxide and can provide a large surface area, low resistance, and many active sites to facilitate electrolyte ion transport and fast redox reactions. The as‐prepared NiCo 2 O 4 /CoMoO 4 hybrid with synergetic effects shows improved electrochemical properties with an excellent capacitance (2080 F/g at 1 A/g) and long‐term cycling reliability (70 % retention undergoing 3000 cycles at 10 A/g). An assembled hybrid supercapacitor based on the as‐prepared NiCo 2 O 4 /CoMoO 4 hybrid electrode delivers a high energy density of 35.63 Wh/kg at a power density of 845 W/kg and a long‐term cycling life (capacitance retention of 71.4 % over 9000 cycles). Thus, the as‐prepared NiCo 2 O 4 /CoMoO 4 nanocomposite has a definite advantage for supercapacitor electrode materials.