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<p>Recently, zinc-air batteries have been of great interest due to their high theoretical specific energy that plays an important role in renewable energy conversion, while the sluggish kinetics of their half-reactions of oxygen reduction and oxygen evolution (ORR/OER) limit their widespread applications. Herein, we report the synthesis of self-assembly Ni@PdNiO<sub><i>x</i></sub> seashell-like nanostructures (Ni@PdNiO<sub><i>x</i></sub> NSs) with low Pd content through a novel one-step wet chemical method for the first time. The optimized self-assembly Ni@PdNiO<sub><i>x</i></sub> NSs with a thickness of 2.06 nm are connected self-assembled to form a network structure, which exhibits a large surface area and unprecedented ORR/OER with a positive half-wave potential of 0.892 V <i>vs.</i> RHE and an overpotential of 230 mV at 10 mA/cm<sup>2</sup> in alkaline solution, outperforming most of the PdNi catalysts. When the self-assembly Ni@PdNiO<sub><i>x</i></sub> NSs are applied as electrodes for zinc-air batteries, they deliver a high power density of 88.9 mW/cm<sup>2</sup> and an impressive energy density of 714 mA·h·g<sup>−1</sup>. This work opens up a new strategy for generating superior oxygen electrocatalysis and provides new insight into the correlation of low Pd content and Ni in the improvement of alkaline oxygen electrocatalysis.</p>

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Ni@PdNiOx Bimetallic Synergism and Oxide Site Modulation to Boost Oxygen Electrocatalysis in Highly Durable Zn-Air Batteries

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Wen Zhang,
  • Ning Zhang,
  • Jianyang Gao,
  • Fusheng Liu,
  • Yang Zhang,
  • Guang-Rui Xu,
  • Lei Wang

摘要

Recently, zinc-air batteries have been of great interest due to their high theoretical specific energy that plays an important role in renewable energy conversion, while the sluggish kinetics of their half-reactions of oxygen reduction and oxygen evolution (ORR/OER) limit their widespread applications. Herein, we report the synthesis of self-assembly Ni@PdNiOx seashell-like nanostructures (Ni@PdNiOx NSs) with low Pd content through a novel one-step wet chemical method for the first time. The optimized self-assembly Ni@PdNiOx NSs with a thickness of 2.06 nm are connected self-assembled to form a network structure, which exhibits a large surface area and unprecedented ORR/OER with a positive half-wave potential of 0.892 V vs. RHE and an overpotential of 230 mV at 10 mA/cm2 in alkaline solution, outperforming most of the PdNi catalysts. When the self-assembly Ni@PdNiOx NSs are applied as electrodes for zinc-air batteries, they deliver a high power density of 88.9 mW/cm2 and an impressive energy density of 714 mA·h·g−1. This work opens up a new strategy for generating superior oxygen electrocatalysis and provides new insight into the correlation of low Pd content and Ni in the improvement of alkaline oxygen electrocatalysis.