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<p>The rapid advancement of offshore renewable energy has established direct seawater electrolysis as a highly valuable approach for green hydrogen production. However, developing efficient electrocatalysts that can withstand long-term seawater corrosion remains a significant challenge. Herein, we present a one-step fabrication method for Co/Fe<sub>2</sub>O<sub>3</sub> heterostructure catalysts via plasma-enhanced chemical vapor deposition (PECVD). The heterointerface facilitates substantial charge transfer, thereby optimizing reaction kinetics and boosting oxygen evolution reaction (OER) activity. Moreover, the formation of Co–O–Fe bonds at the interface reinforces structural stability under operating conditions. As a result, the synthesized catalyst exhibits exceptional OER performance and durability in simulated seawater electrolyte, achieving a low overpotential of 291&#xa0;mV at 10&#xa0;mA&#xa0;cm<sup>−2</sup> and maintaining stable operation for over 500&#xa0;h at 100&#xa0;mA&#xa0;cm<sup>−2</sup>. This study presents a novel strategy and material system for designing efficient and corrosion-resistant electrocatalysts for seawater splitting.</p>

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Co–O–Fe Interfacial Bonding in PECVD-Synthesized Co/Fe2O3 Heterostructure Boosts Seawater Electrolysis

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Fengyu Huang,
  • Sipu Li,
  • Chen Li,
  • Bingxue Zhang,
  • Yongqi Zhang

摘要

The rapid advancement of offshore renewable energy has established direct seawater electrolysis as a highly valuable approach for green hydrogen production. However, developing efficient electrocatalysts that can withstand long-term seawater corrosion remains a significant challenge. Herein, we present a one-step fabrication method for Co/Fe2O3 heterostructure catalysts via plasma-enhanced chemical vapor deposition (PECVD). The heterointerface facilitates substantial charge transfer, thereby optimizing reaction kinetics and boosting oxygen evolution reaction (OER) activity. Moreover, the formation of Co–O–Fe bonds at the interface reinforces structural stability under operating conditions. As a result, the synthesized catalyst exhibits exceptional OER performance and durability in simulated seawater electrolyte, achieving a low overpotential of 291 mV at 10 mA cm−2 and maintaining stable operation for over 500 h at 100 mA cm−2. This study presents a novel strategy and material system for designing efficient and corrosion-resistant electrocatalysts for seawater splitting.