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<p>Layered double hydroxide (LDH)-based phosphorized materials hold great promise for application in the oxygen evolution reaction (OER) due to their excellent electrical conductivity and active-site characteristics. In this study, using nickel foam (NF) as the substrate, we systematically investigated the structure–property relationships among the phase composition, microstructure, surface chemical state, and OER catalytic performance of CoNiFe-LDH/NF precursors with varying Ni/Fe ratios and their phosphorized products through composition tuning and phosphorization temperature optimization. The results indicate that CoNi<sub>1</sub>Fe<sub>1</sub>-LDH/NF with a Ni/Fe molar ratio of 1:1 is the optimal precursor, and 400°C is the optimal phosphorization temperature. The phosphorized product exhibits an overpotential as low as 199.0&#xa0;mV, a Tafel slope of 38.9&#xa0;mV&#xa0;dec<sup>−1</sup>, a C<sub>dl</sub> value of 9.38&#xa0;mF&#xa0;cm<sup>−2</sup>, and an Rct value of 0.354&#xa0;Ω. It also demonstrated excellent long-term stability at a current density of 10.0&#xa0;mA&#xa0;cm<sup>−2</sup>. This study identified the optimal composition ratio and phosphorization temperature for LDH-based phosphorized materials, revealing the intrinsic relationship between multi-metal synergistic electronic regulation and structural properties, and providing a theoretical basis and technical support for the design and optimization of highly efficient OER catalytic materials.</p>

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Dual regulation of components and phosphorization temperature on the structural evolution and OER catalytic performance of CoNiFe-LDH-based materials

  • 期刊论文

  • 发表日期：

    2026年6月28日

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  • Qianqian An,
  • Junhua You,
  • Tong Liu,
  • Jie Zhang

摘要

Layered double hydroxide (LDH)-based phosphorized materials hold great promise for application in the oxygen evolution reaction (OER) due to their excellent electrical conductivity and active-site characteristics. In this study, using nickel foam (NF) as the substrate, we systematically investigated the structure–property relationships among the phase composition, microstructure, surface chemical state, and OER catalytic performance of CoNiFe-LDH/NF precursors with varying Ni/Fe ratios and their phosphorized products through composition tuning and phosphorization temperature optimization. The results indicate that CoNi1Fe1-LDH/NF with a Ni/Fe molar ratio of 1:1 is the optimal precursor, and 400°C is the optimal phosphorization temperature. The phosphorized product exhibits an overpotential as low as 199.0 mV, a Tafel slope of 38.9 mV dec−1, a Cdl value of 9.38 mF cm−2, and an Rct value of 0.354 Ω. It also demonstrated excellent long-term stability at a current density of 10.0 mA cm−2. This study identified the optimal composition ratio and phosphorization temperature for LDH-based phosphorized materials, revealing the intrinsic relationship between multi-metal synergistic electronic regulation and structural properties, and providing a theoretical basis and technical support for the design and optimization of highly efficient OER catalytic materials.