Scholarlink

<p>The development of low-cost and durable electrocatalysts for the hydrogen evolution reaction (HER) is essential for the large-scale implementation of water electrolysis technologies. In this study, Fe-based (W,Ti)C composite coatings were successfully fabricated for the first time using a scalable wire-arc-spraying process and evaluated as electrocatalysts for HER in alkaline media. Structural and microstructural analyses revealed a heterogeneous architecture composed of <i>α</i>-Fe, WC, W<sub>2</sub>C, TiC, Fe<sub>3</sub>C, and minor oxide phases, forming a conductive and catalytically active network. SEM and optical profilometry confirmed the presence of a hierarchical rough surface morphology, which enhances the electrochemically active surface area and facilitates electrolyte access. Electrochemical measurements demonstrated efficient catalytic behavior, characterized by low charge-transfer resistance, stable interfacial kinetics, and a mixed capacitive–faradaic response. The Fe-based (W,Ti)C coating exhibited a HER onset potential of approximately 0.2&#xa0;V versus RHE and a Tafel slope of about 0.62&#xa0;V&#xa0;dec<sup>−1</sup>, indicating a Volmer–Heyrovsky reaction mechanism. Furthermore, long-term electrolysis tests showed a stable hydrogen production rate of 2551.92&#xa0;µmol&#xa0;h<sup>−1</sup>, confirming the durability of the coating under operating conditions. These findings demonstrate that wire-arc-sprayed Fe-based (W,Ti)C coatings represent a promising and industrially scalable class of noble-metal-free HER electrocatalysts, offering a cost-effective pathway for sustainable hydrogen production.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Wire-Arc-Sprayed Fe-Based (W,Ti)C Coatings as Novel and Scalable Electrocatalysts for the Hydrogen Evolution Reaction

  • 期刊论文

  • 发表日期：

    2026年6月19日

查看全文
  • Khaled Derkaoui,
  • Yamina Mebdoua,
  • Chakib Talbi,
  • Hadj Lahmar,
  • Chaker Serdani,
  • Naitbouda Abdelyamine,
  • Soumia Benredouane,
  • Boukhouidem Khadidja,
  • Toufik Hadjersi

摘要

The development of low-cost and durable electrocatalysts for the hydrogen evolution reaction (HER) is essential for the large-scale implementation of water electrolysis technologies. In this study, Fe-based (W,Ti)C composite coatings were successfully fabricated for the first time using a scalable wire-arc-spraying process and evaluated as electrocatalysts for HER in alkaline media. Structural and microstructural analyses revealed a heterogeneous architecture composed of α-Fe, WC, W2C, TiC, Fe3C, and minor oxide phases, forming a conductive and catalytically active network. SEM and optical profilometry confirmed the presence of a hierarchical rough surface morphology, which enhances the electrochemically active surface area and facilitates electrolyte access. Electrochemical measurements demonstrated efficient catalytic behavior, characterized by low charge-transfer resistance, stable interfacial kinetics, and a mixed capacitive–faradaic response. The Fe-based (W,Ti)C coating exhibited a HER onset potential of approximately 0.2 V versus RHE and a Tafel slope of about 0.62 V dec−1, indicating a Volmer–Heyrovsky reaction mechanism. Furthermore, long-term electrolysis tests showed a stable hydrogen production rate of 2551.92 µmol h−1, confirming the durability of the coating under operating conditions. These findings demonstrate that wire-arc-sprayed Fe-based (W,Ti)C coatings represent a promising and industrially scalable class of noble-metal-free HER electrocatalysts, offering a cost-effective pathway for sustainable hydrogen production.