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<p>Currently, NiAl-LDH-based catalysts have been developed using a simple one-step method with Na<sub>2</sub>S as the sulfur source for the sulfidation process, which exhibit high performance for water oxidation in alkaline media. In this work, the NiAl-layered double hydroxide (NiAl-LDH-S-50%) was synthesized via a hydrothermal method followed by the sulfidation treatment, in which there was a promoted efficient electron transfer. Furthermore, the effect of S/(Ni and Al) ratio on the catalytic performance of the samples was examined. It was found that the NiAl-LDH-S-50% sample demonstrated an outstanding water oxidation activity, and required only overpotentials of about 100 and 190 mV to reach the current densities of 10 and 50&#xa0;mA cm<sup>−2</sup>, respectively. Such a good performance of NiAl-LDH-S-50% was attributed to low charge transfer resistance (5.2 Ω cm<sup>− 2</sup>) due to its excellent electrical conductivity. Moreover, the as-prepared electrocatalyst showed remarkable stability and durability after 24&#xa0;h of continuous water oxidation. A promising approach to improve water oxidation performance by optimizing the electronic structure of the NiAl-LDH-S sample with low Tafel slope about 67 mV dec<sup>− 1</sup>.</p> Graphical abstract <p></p>

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Transitioning from hydroxides to sulfides: enhancing the catalytic activity of NiAl-layered double hydroxide for improved water oxidation efficiency

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • Zolfaghar Rezvani,
  • Leila Jafari Foruzin,
  • Kamellia Nejati,
  • Hongxing Dai

摘要

Currently, NiAl-LDH-based catalysts have been developed using a simple one-step method with Na2S as the sulfur source for the sulfidation process, which exhibit high performance for water oxidation in alkaline media. In this work, the NiAl-layered double hydroxide (NiAl-LDH-S-50%) was synthesized via a hydrothermal method followed by the sulfidation treatment, in which there was a promoted efficient electron transfer. Furthermore, the effect of S/(Ni and Al) ratio on the catalytic performance of the samples was examined. It was found that the NiAl-LDH-S-50% sample demonstrated an outstanding water oxidation activity, and required only overpotentials of about 100 and 190 mV to reach the current densities of 10 and 50 mA cm−2, respectively. Such a good performance of NiAl-LDH-S-50% was attributed to low charge transfer resistance (5.2 Ω cm− 2) due to its excellent electrical conductivity. Moreover, the as-prepared electrocatalyst showed remarkable stability and durability after 24 h of continuous water oxidation. A promising approach to improve water oxidation performance by optimizing the electronic structure of the NiAl-LDH-S sample with low Tafel slope about 67 mV dec− 1.

Graphical abstract