A Long‐Range Disordered RuO₂ Catalyst for Highly Efficient Acidic Oxygen Evolution Electrocatalysis

Abstract Non‐iridium acid‐stabilized electrocatalysts for oxygen evolution reaction (OER) are crucial to reducing the cost of proton exchange membrane water electrolyzers (PEMWEs). Here, we report a strategy to modulate the stability of RuO 2 by doping boron (B) atoms, leading to the preparation of a RuO 2 catalyst with long‐range disorder (LD‐B/RuO 2 ). The structure of long‐range disorder endowed LD‐B/RuO 2 with a low overpotential of 175 mV and an ultra‐long stability, which can maintain OER for about 1.6 months at 10 mA cm −2 current density in 0.5 M H 2 SO 4 with almost invariable performance. More importantly, a PEM electrolyzer using LD‐B/RuO 2 as the anode demonstrated excellent performance, reaching 1000 mA cm −2 at 1.63 V with durability exceeding 300 h at 250 mA cm −2 current density. The introduction of B atoms induced the formation of a long‐range disordered structure and symmetry‐breaking B−Ru−O motifs, which enabled the catalyst structure to a certain toughness while simultaneously inducing the redistribution of electrons on the active center Ru, which jointly promoted and guaranteed the activity and long‐term stability of LD‐B/RuO 2 . This study provides a strategy to prepare long‐range disordered RuO 2 acidic OER catalysts with high stability using B‐doping to perturb crystallinity, which opens potential possibilities for non‐iridium‐based PEMWE applications.