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<p>As a highly promising route for hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) synthesis, the two-electron oxygen reduction reaction (2e<sup>−</sup> ORR) relies on oxygen as the feedstock. However, transition metal hydroxide catalysts for 2e<sup>−</sup> ORR suffer from low H<sub>2</sub>O<sub>2</sub> selectivity and poor long-term stability. Additionally, the intrinsic mechanism by which metal cation doping regulates their catalytic activity and reaction pathways remains unclear. To address these challenges, this study adopts a hydrothermal synthesis approach, incorporating zinc ions (Zn<sup>2+</sup>) into the lattice of nickel hydroxide [Ni(OH)<sub>2</sub>] to construct a Zn-Ni(OH)<sub>2</sub> composite catalyst. XRD and XPS results collectively confirm that Zn doping modulates both the crystal structure and electronic properties of Ni(OH)<sub>2</sub>. These structural and electronic modifications optimize the end-on adsorption of the key *OOH intermediate, thereby enhancing the catalytic stability and delivering superior 2e<sup>−</sup> ORR performance. Under alkaline conditions, the Zn-Ni(OH)<sub>2</sub> catalyst achieves a H<sub>2</sub>O<sub>2</sub> production rate of 6.78 ± 0.23&#xa0;mol&#xa0;g(cat)<sup>−1</sup>&#xa0;h<sup>−1</sup>, with a selectivity reaching up to 97.7% and a Faraday efficiency (FE) of 86.52 ± 2.7%. Notably, the catalyst demonstrates outstanding long-term stability compared to most reported transition metal hydroxide-based catalysts, showing only ~ 10% performance decay after 10&#xa0;h of continuous operation. Furthermore, the in-situ generated H<sub>2</sub>O<sub>2</sub> on the Zn-Ni(OH)<sub>2</sub> catalyst triggers a Fenton-like reaction, yielding highly reactive hydroxyl radicals that enable efficient degradation of organic pollutants. This study offers a novel approach for the advancement of transition metal hydroxide catalysts for H<sub>2</sub>O<sub>2</sub> production.</p> Graphical abstract <p></p>

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Boosting electrochemical H2O2 synthesis via zinc doping in nickel hydroxide for enhanced activity and stability

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Xu Wu,
  • Xiaohui Ma,
  • Zhuang Cai,
  • Lin Li,
  • Jitao Li,
  • Hang Yue,
  • Yuan Zhang,
  • Ying Dai,
  • Yuxin Song,
  • Jinlong Zou

摘要

As a highly promising route for hydrogen peroxide (H2O2) synthesis, the two-electron oxygen reduction reaction (2e− ORR) relies on oxygen as the feedstock. However, transition metal hydroxide catalysts for 2e− ORR suffer from low H2O2 selectivity and poor long-term stability. Additionally, the intrinsic mechanism by which metal cation doping regulates their catalytic activity and reaction pathways remains unclear. To address these challenges, this study adopts a hydrothermal synthesis approach, incorporating zinc ions (Zn2+) into the lattice of nickel hydroxide [Ni(OH)2] to construct a Zn-Ni(OH)2 composite catalyst. XRD and XPS results collectively confirm that Zn doping modulates both the crystal structure and electronic properties of Ni(OH)2. These structural and electronic modifications optimize the end-on adsorption of the key *OOH intermediate, thereby enhancing the catalytic stability and delivering superior 2e− ORR performance. Under alkaline conditions, the Zn-Ni(OH)2 catalyst achieves a H2O2 production rate of 6.78 ± 0.23 mol g(cat)−1 h−1, with a selectivity reaching up to 97.7% and a Faraday efficiency (FE) of 86.52 ± 2.7%. Notably, the catalyst demonstrates outstanding long-term stability compared to most reported transition metal hydroxide-based catalysts, showing only ~ 10% performance decay after 10 h of continuous operation. Furthermore, the in-situ generated H2O2 on the Zn-Ni(OH)2 catalyst triggers a Fenton-like reaction, yielding highly reactive hydroxyl radicals that enable efficient degradation of organic pollutants. This study offers a novel approach for the advancement of transition metal hydroxide catalysts for H2O2 production.

Graphical abstract