关键词: 二氧化钌, 铬掺杂, 电催化, 析氧反应, 酸性介质

Abstract: Hydrogen production from water electrolysis represents a crucial pathway for renewable energy storage, yet the anodic oxygen evolution reaction (OER) remains the efficiency bottleneck due to its sluggish kinetics. In this study, we present a chromium-doped ruthenium dioxide (py-RuO₂:Cr) synthesized using a simple one-step pyrolysis method, and evaluate its OER catalytic performance. The py-RuO₂:Cr catalyst reveals excellent OER activity with an overpotential of only 196 mV at 10 mA∙cm^-2, and operates stably for over 500 h in acidic media. Experimental studies show that the Cr dopant induces the formation of oxygen vacancies and modulates the oxidation state of Ru. Mechanistic insights reveal that the structural features of py-RuO₂:Cr give rise to pH-dependent OER kinetics, indicating increased direct participation of lattice oxygen in the formation and transformation of reaction intermediates. This pathway effectively lowers the energy barrier for the OER, resulting in significantly enhanced catalytic performance.

Key words: ruthenium dioxides, Cr dopant, electrocatalysis, oxygen evolution reaction, acidic medium