Scholarlink

<p>Nanostructured CaFe<sub>2</sub>O<sub>4</sub> was successfully synthesized via a simple co-precipitation method followed by thermal treatment and evaluated as a noble-metal-free electrocatalyst for the hydrogen evolution reaction (HER) in alkaline medium. X-ray diffraction analysis confirmed the formation of a highly crystalline orthorhombic CaFe<sub>2</sub>O<sub>4</sub> phase with a minor Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub> secondary phase, while transmission electron microscopy revealed agglomerated nanoparticles with sizes ranging from approximately 70 to 170&#xa0;nm. Electrochemical measurements demonstrated favorable electrochemical activity, efficient charge-transfer behavior, and stable electrode/electrolyte interfacial characteristics. The synthesized catalyst exhibited an onset potential of 0.319&#xa0;V and achieved a cathodic current density of approximately 33&#xa0;mA&#xa0;cm⁻<sup>2</sup>, indicating promising HER activity in alkaline electrolyte. Electrochemical impedance spectroscopy revealed a low charge-transfer resistance, whereas Bode analysis confirmed efficient electron transport and ion diffusion. The Tafel slope of 281&#xa0;mV dec⁻<sup>1</sup> suggested that the HER kinetics are predominantly controlled by the Volmer step involving water dissociation. The enhanced electrocatalytic performance is attributed to the synergistic contribution of the highly crystalline structure, nanostructured morphology, electroactive Fe centers, and heterointerfaces associated with the minor Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub> phase. These findings demonstrate that CaFe<sub>2</sub>O<sub>4</sub> is a promising, earth-abundant, and cost-effective electrocatalyst for alkaline hydrogen evolution and provide valuable insights into the development of ferrite-based materials 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

Electrocatalytic performance of CaFe2O4 for alkaline hydrogen production: structure–activity relationships and charge-transfer characteristics

  • 期刊论文

  • 发表日期：

    2026年7月28日

查看全文
  • Taha Yakoub Bakel,
  • Khadidja Boukhouidem,
  • Salima Aberkane,
  • Khaled O. Sebakhy,
  • Ahmed Abd El-Fattah,
  • Salah Eddine Berrabah,
  • Khaled Derkaoui,
  • Toufik Hadjersi,
  • Naima Bouslah,
  • Mohamed Trari

摘要

Nanostructured CaFe2O4 was successfully synthesized via a simple co-precipitation method followed by thermal treatment and evaluated as a noble-metal-free electrocatalyst for the hydrogen evolution reaction (HER) in alkaline medium. X-ray diffraction analysis confirmed the formation of a highly crystalline orthorhombic CaFe2O4 phase with a minor Ca2Fe2O5 secondary phase, while transmission electron microscopy revealed agglomerated nanoparticles with sizes ranging from approximately 70 to 170 nm. Electrochemical measurements demonstrated favorable electrochemical activity, efficient charge-transfer behavior, and stable electrode/electrolyte interfacial characteristics. The synthesized catalyst exhibited an onset potential of 0.319 V and achieved a cathodic current density of approximately 33 mA cm⁻2, indicating promising HER activity in alkaline electrolyte. Electrochemical impedance spectroscopy revealed a low charge-transfer resistance, whereas Bode analysis confirmed efficient electron transport and ion diffusion. The Tafel slope of 281 mV dec⁻1 suggested that the HER kinetics are predominantly controlled by the Volmer step involving water dissociation. The enhanced electrocatalytic performance is attributed to the synergistic contribution of the highly crystalline structure, nanostructured morphology, electroactive Fe centers, and heterointerfaces associated with the minor Ca2Fe2O5 phase. These findings demonstrate that CaFe2O4 is a promising, earth-abundant, and cost-effective electrocatalyst for alkaline hydrogen evolution and provide valuable insights into the development of ferrite-based materials for sustainable hydrogen production.