Urchin-like Medium-Entropy Oxyhydroxide FeCoNiOOH Nanoparticles Supported on Nickel Foam for Seawater Oxidation

作者：Ruotong Song, Yuanyuan Ma, Mingyuan Shi, Zhifang Li, Wanting Liu, Wenbo Ma, Chunling Zuo, Hao Zhang, Zheng Nan, Yuhang Sun · 发表于：ACS Applied Nano Materials · 年份：2025 · DOI：10.1021/acsanm.5c01527 · 被引用次数：6 · 研究领域：Electrocatalysts for Energy Conversion、Catalytic Processes in Materials Science、Advanced battery technologies research

Developing electrocatalysts with exceptional efficiency and remarkable corrosion resistance for seawater electrolysis presents a significant challenge. Here, an urchin-like medium-entropy Fe–Co–Ni oxyhydroxide on nickel foam (NF) exhibits high surface area, rich active sites, and a short charge diffusion path to enhance oxygen evolution reaction (OER) activity. In 1 M KOH, 1 M KOH + 0.5 M NaCl, 1 M KOH + 1 M NaCl, and 1 M KOH + seawater electrolyte, FeCoNiOOH/NF exhibits exceptional OER performance, featuring impressively low overpotentials (η 10 ) of 182, 195, 205, and 216 mV, respectively. Furthermore, FeCoNiOOH/NF displays remarkable stability in alkaline freshwater and seawater at 100 mA cm –2 for over 25 h. In situ Raman measurements demonstrate that NiOOH is the key active component in the OER process. This study provides an avenue to design medium-entropy oxyhydroxide catalysts for seawater splitting.