Active sites-induced decoration of nickel hydroxide nanosheets on copper oxide nanocubes as electroactive material of battery supercapacitor hybrids

Tsai Mu Cheng, Pin Chun Lee, Mei Wei Chen, Hung Ming Chen, Sibidou Yougbaré, Lu Yin Lin, Yung Fu Wu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Battery supercapacitor hybrids (BSH) comprising battery and supercapacitor-type electrodes can attain high energy/power densities and long cycle life. Copper oxide is regarded as a promising battery-type active material, due to low-cost, high chemical stability and good electrochemical properties. However, poor electrical conductivity and insufficient active sites should be improved to attain high energy storage ability. In this work, a novel battery-type material composed of Ni(OH)2 nanosheets decorated on Cu2O cages is synthesized via a facile solution process for the first time. Less deposition of Ni(OH)2 leads to sparse distribution on Cu2O cages, and full coverage of Ni(OH)2 is achieved via depositing four Ni(OH)2 layers on Cu2O cages. The largest specific capacitance (CF) of 389.1 F/g is achieved at 20 mV/s for the optimized Ni(OH)2 and Cu2O (Ni(OH)2@Cu2O) composite, while the Cu2O electrode shows a smaller CF value of 79.7 F/g. Coating Ni(OH)2 on Cu2O can induce active site formation and enhance electrical conductivity. The Ni(OH)2@Cu2O positive electrode and the active carbon negative electrode are used to assemble a BSH, which presents a maximum energy density of 4.09 Wh/kg at 500 W/kg and excellent cycling ability with CF retention of 70% and Coulombic efficiency higher than 97% after 10,000 charge/discharge cycles.

Original languageEnglish
Article number108143
JournalJournal of Energy Storage
Volume72
DOIs
Publication statusAccepted/In press - 2023

Keywords

  • Battery supercapacitor hybrid
  • Copper oxide
  • Coulombic efficiency
  • Electrical conductivity
  • Nickel hydroxide
  • Solution process

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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