Electrocatalyst enhances oxygen evolution efficiency in PEM water electrolysis, implying a step forward for hydrogen production.
Developing efficient and durable anode electrocatalysts is essential for translating proton exchange membrane water electrolysis (PEMWE) into practical hydrogen production. Here, we report an Mn₂O₃ supported RuO₂ electrocatalyst featuring short-range-ordered RuO₂ domains that synergistically combines high activity and durability for acidic oxygen evolution. Hydrothermal Ru deposition followed by calcination enables uniform RuO₂ dispersion on Mn₂O₃, yielding edge-rich RuO₂ domains with limited long-range crystallinity. Structural characterization shows that RuO₂/Mn₂O₃ retained stable Ru speciation and an almost constant oxygen vacancy fraction after extended OER operation, consistent with suppressed anodic degradation. Operando spectroscopy captures the key *OOH and *OO intermediates, supporting an adsorbate evolution mechanism (AEM) under acidic conditions. Building on the identified AEM pathway and the stabilized catalyst structure, RuO₂/Mn₂O₃ achieves an overpotential of 150 mV at 10 mA cm⁻², a Tafel slope of 44.6 mV dec⁻¹, and stable operation for >400 h in acidic electrolyte. In PEMWE tests, RuO₂/Mn₂O₃ delivers 1.0 A cm⁻² at 1.61 V and operates stably for 100 h at 200 mA cm⁻², highlighting its promise for practical acidic water electrolysis.
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Cui et al. (2026) studied this question.
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