Fine-tuning electronic structure of S-NiMoO4 coupled with NiFe-layered double hydroxides for enhanced electrochemical water oxidation

IF 8.1 2区 工程技术 Q1 CHEMISTRY, PHYSICAL Journal of Power Sources Pub Date : 2025-03-14 DOI:10.1016/j.jpowsour.2025.236699
Yujie Xiang , Zhengting Wang , Ying Zhang , Rui Gao , Yonggui Tao , Chisheng Deng , Shukang Deng , Jinsong Wang , Kaiyuan Shen
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Abstract

The environmentally friendly and sustainable characteristics of hydrogen generation through water electrolysis have drawn considerable interest. However, the inherently retarded reaction dynamics of the oxygen evolution reaction (OER) limit its efficiency. Consequently, advancing high-performance and cost-effective OER electrocatalysts significantly strengthen the water electrolysis’ performance. A composite nanostructured catalyst is successfully developed by integrating S-doped NiMoO4 with NiFe-layered double hydroxides (LDH). Characterization results indicate that the NiMoO4-decorated NiFe-LDH increases catalytic efficiency by providing additional active sites, while the introduced S further enhances electrical conductivity. Electrochemical tests reveal that the OER capability of S-NiMoO4@NiFe-LDH under alkaline conditions is exceptional, achieving a negligible overpotential of 256 mV at 50 mA cm−2 and a minimal Tafel slope of 27.8 mV dec−1, along with outstanding durability at 10 mA cm−2 (200 h). Furthermore, electrochemical probe experiments and mechanistic analyses reveal the possible potential reaction route of the catalyst during the OER, playing a crucial role in clarifying how the adsorbate evolution mechanism (AEM) and the lattice oxygen mechanism (LOM) synergistically enhance catalytic performance. This study affords a compelling strategy for establishing stable and efficient catalysts for electrochemical water oxidation.

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通过电解水制氢具有环保和可持续的特点,这引起了人们的极大兴趣。然而,氧进化反应(OER)固有的缓慢反应动力学限制了其效率。因此,开发高性能、高性价比的氧进化反应电催化剂可显著提高水电解的性能。通过将 S 掺杂的 NiMoO4 与 NiFe 层状双氢氧化物(LDH)结合在一起,成功开发出了一种复合纳米结构催化剂。表征结果表明,NiMoO4 装饰的 NiFe-LDH 通过提供额外的活性位点提高了催化效率,而引入的 S 则进一步提高了导电性。电化学测试表明,S-NiMoO4@NiFe-LDH 在碱性条件下的 OER 能力非常出色,在 50 mA cm-2 时过电位为 256 mV,可忽略不计,塔菲尔斜率为 27.8 mV dec-1,在 10 mA cm-2 时(200 小时)具有出色的耐久性。此外,电化学探针实验和机理分析揭示了催化剂在 OER 过程中可能发生的潜在反应路线,这对于阐明吸附剂进化机制(AEM)和晶格氧机制(LOM)如何协同提高催化性能至关重要。这项研究为建立稳定、高效的电化学水氧化催化剂提供了令人信服的策略。
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来源期刊
Journal of Power Sources
Journal of Power Sources 工程技术-电化学
CiteScore
16.40
自引率
6.50%
发文量
1249
审稿时长
36 days
期刊介绍: The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells. Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include: • Portable electronics • Electric and Hybrid Electric Vehicles • Uninterruptible Power Supply (UPS) systems • Storage of renewable energy • Satellites and deep space probes • Boats and ships, drones and aircrafts • Wearable energy storage systems
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