Dual-Descriptor-Guided Screening of Stable Metal-Doped RuO 2 Catalysts for Acidic Oxygen Evolution

作者：Aiqing Cao, Susu Zhao, Anuj Kumar, Hao Sun, Mengwei Chen, Quandong Zhang, Bichen Yuan, Wenhai Xu, Yaling Zhang, Yu Zhang, Hui Li, Daojin Zhou, KANGMING LI, Fengmei Wang, Yaping Li, Haijun Xu, Xiaoming Sun · 发表于：Journal of the American Chemical Society · 年份：2026 · DOI：10.1021/jacs.5c17145 · 被引用次数：15 · 研究领域：Electrocatalysts for Energy Conversion、Hybrid Renewable Energy Systems、Advanced battery technologies research

Doping metallic elements into RuO 2 enhances the efficiency of proton-exchange membrane water electrolyzers (PEMWEs), yet identifying optimal dopants remains challenging due to a complex interplay of structural, electronic, and thermodynamic factors. Herein, computed E -pH-based Pourbaix diagrams combined with Ru–O bond-length analysis served as dual descriptors to evaluate the dopant-induced stability of RuO 2 . First, thermodynamic preferences of various dopants were revealed by comparing the formation energies of three oxygen-coordination states on M-RuO 2 surfaces: O-covered (O c ), pristine, and O-depleted (O d ). Second, first-principles-derived Pourbaix diagrams for M-RuO 2, constructed as a function of pH from the formation energy, reflected the proton/electron transfer during oxidation and revealed metal-dependent thermodynamic stability. These diagrams defined distinct stability regions (SRs), governed by triple-point pH and phase-transition potentials (RuO 2 to Ru 3+ /RuO 4 ), serving as effective descriptors for dopant screening. Third, the Ru–O bond length (BL) acted as a structural descriptor, revealing that longer Ru *O –O (Ru *O: Ru with O adsorption) bonds suppress RuO 4 formation, while shorter Ru Ov –O (Ru Ov: Ru with O vacancies) bonds reduce Ru 3+ formation. This led to a volcano-type relationship between the SR and BLs, establishing two thresholds for dopant selection. Finally, eight dopants (Rh, Zn, Ga, Bi, Mn, Nb, Sn, and Os) were identified at the vol...