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<p>The development of high-performance energy materials is essential for addressing global energy challenges. In this study, a NiO@CoZnLDH composite electrode was synthesized via a two-step hydrothermal process, and its electrochemical performance was evaluated for applications in both supercapacitors and water electrolysis. The asymmetric supercapacitor (NiO@CoZnLDH//AC) achieved an energy density of 9.44 Wh/kg at a power density of 1132 W/kg, maintaining 73.6% of its capacitance after 8000 charge–discharge cycles. For electrocatalysis, the composite exhibits low overpotential for hydrogen evolution reaction and oxygen evolution reaction (188.8 and 322.2&#xa0;mV at 10&#xa0;mA/ cm<sup>2</sup>) and enables stable overall water splitting at 1.84&#xa0;V for 12&#xa0;h in 1&#xa0;M KOH. These results confirm that NiO@CoZnLDH is a promising bifunctional material for energy storage and conversion applications.</p>

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Bifunctional NiO@CoZnLDH composites with flower-like nanoarchitecture: synergistic enhancement of energy storage and water electrolysis performance

  • 期刊论文

  • 发表日期：

    2025年9月14日

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  • Ming-Xia Wang,
  • Xingming Zhao,
  • Dong-Mei Ma,
  • Yi Jia,
  • Hong-Sheng Chu,
  • Xiao-Ming Lu,
  • Jun Xiang,
  • Rongda Zhao,
  • Fu-Fa Wu

摘要

The development of high-performance energy materials is essential for addressing global energy challenges. In this study, a NiO@CoZnLDH composite electrode was synthesized via a two-step hydrothermal process, and its electrochemical performance was evaluated for applications in both supercapacitors and water electrolysis. The asymmetric supercapacitor (NiO@CoZnLDH//AC) achieved an energy density of 9.44 Wh/kg at a power density of 1132 W/kg, maintaining 73.6% of its capacitance after 8000 charge–discharge cycles. For electrocatalysis, the composite exhibits low overpotential for hydrogen evolution reaction and oxygen evolution reaction (188.8 and 322.2 mV at 10 mA/ cm2) and enables stable overall water splitting at 1.84 V for 12 h in 1 M KOH. These results confirm that NiO@CoZnLDH is a promising bifunctional material for energy storage and conversion applications.