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<p>The search for high-performance and cost-effective catalysts for bifunctional oxygen reduction (ORR) and evolution reaction (OER) is highly demanded because of the sluggish kinetics of the redox reactions at the cathode of Zn–air batteries (ZABs). In this work, NiCo<sub>2</sub>O<sub>4</sub>/CeO<sub>2</sub> nanoflowers were synthesized by a facile hydrothermal method and loaded on the hydrothermally etched nickel foam (NF-HE) substrates to construct a bifunctional cathode (denoted as NiCo<sub>2</sub>O<sub>4</sub>/CeO<sub>2</sub>@NF-HE), which exhibits excellent catalytic activity and stability attributed to the synergistic effect of increased specific surface area, more exposed active sites, and optimized oxygen diffusion pathways. The optimal NiCo<sub>2</sub>O<sub>4</sub>/CeO<sub>2</sub>@NF-HE cathode exhibits superior onset potentials of 0.88&#xa0;V and 1.45&#xa0;V for ORR and OER, respectively. In addition, the assembled ZAB delivers a reduced charge–discharge voltage gap of 0.76&#xa0;V and a stable cycling performance over 33&#xa0;h, surpassing that of commercial 20&#xa0;wt% Pt/C catalysts. This work provides new insights into the design of novel bifunctional cathodes for ZABs.</p>

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Hierarchical NiCo2O4/CeO2 nanoflower as an efficient bifunctional cathode for zinc–air batteries

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Yuguang Wu,
  • Liang Jin,
  • Menghan Li,
  • Jiaming Liu,
  • Ying Jiang,
  • Yichao Zhen,
  • Peiyao Zhao,
  • Limin Guo,
  • Xiaohui Wang

摘要

The search for high-performance and cost-effective catalysts for bifunctional oxygen reduction (ORR) and evolution reaction (OER) is highly demanded because of the sluggish kinetics of the redox reactions at the cathode of Zn–air batteries (ZABs). In this work, NiCo2O4/CeO2 nanoflowers were synthesized by a facile hydrothermal method and loaded on the hydrothermally etched nickel foam (NF-HE) substrates to construct a bifunctional cathode (denoted as NiCo2O4/CeO2@NF-HE), which exhibits excellent catalytic activity and stability attributed to the synergistic effect of increased specific surface area, more exposed active sites, and optimized oxygen diffusion pathways. The optimal NiCo2O4/CeO2@NF-HE cathode exhibits superior onset potentials of 0.88 V and 1.45 V for ORR and OER, respectively. In addition, the assembled ZAB delivers a reduced charge–discharge voltage gap of 0.76 V and a stable cycling performance over 33 h, surpassing that of commercial 20 wt% Pt/C catalysts. This work provides new insights into the design of novel bifunctional cathodes for ZABs.