Nonmetal–Metal Strategy to Reduce Ru–O Covalency while Promoting Local Reactive Water Concentration for Efficient Acidic Oxygen Evolution

作者：Mingming Wang, Xinyi Li, Zhongfeng Wang, Hong Huang, Xiaoyuan Sun, Hailong Chen, Hao Luo, Lu Li, Xiaoxin Zou, Xiao Zhao · 发表于：Nano Letters · 年份：2025 · DOI：10.1021/acs.nanolett.5c02815 · 被引用次数：29 · 研究领域：Electrocatalysts for Energy Conversion、Electrochemical Analysis and Applications、Fuel Cells and Related Materials

Affordable, active, and durable oxygen evolution reaction (OER) catalysts are crucial for proton exchange membrane water electrolysis (PEMWE). The low-cost RuO 2, relative to IrO 2, is attractive for acidic OER while suffering from durability. To resolve this activity–stability dilemma of RuO 2, we propose a universal nonmetal–metal strategy to reduce Ru–O covalency while promoting local reactive water concentration for efficient acidic OER. The nonmetal–metal dual-dopant via complementary regulation of O 2 p and Ru 4 d bands weakens the Ru–O covalency, constraining the lattice oxygen participation and Ru dissolution. Operando evidence further unravels that the best-performing B–Cr–RuO 2, via surface OH, increases the local reactive water concentration and the connectivity of H-bond networks, enabling an order of magnitude enhancement in intrinsic activity without sacrificing durability over RuO 2 . Consequently, the B–Cr–RuO 2 -incorporated PEMWE delivers attractive performance for practical applications, requiring a voltage of only 1.54 [email protected] A cm –2 and maintaining a durable operation at industrial current densities.