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Bi₂Ru₂O₇ de tipo pirocloro con estructura electrónica local regulada para una reacción de evolución de oxígeno

Chang Ju¹, Yuxing Wang¹, Xinyu Liu¹

¹College of Materials Science and Engineering, Jiangsu Collaborative Innovation Centre for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing, China.

Small (Weinheim an der Bergstrasse, Germany)

|January 27, 2026

Abstract:

Anion-exchange membrane water electrolysis (AEMWE) represents a prospective technology for hydrogen production but suffers from the lack of efficient oxygen evolution electrocatalysts with high activity, robust stability, and reduced cost. Herein, we report pyrochlore-type bismuth ruthenates (Bi₂Ru₂O₇, BRO) as promising electrocatalysts for oxygen evolution reaction (OER), which exhibits more than 20 times higher OER activity than RuO₂ yet with 48.3 wt.% less Ru content. The high intrinsic activity of BRO originates from the regulated local electronic structure of Ru sites by Bi, optimizing the adsorption behavior of oxygen intermediates and thus boosting the OER kinetics. Moreover, the assembled AEM electrolyzer with BRO as the anode can show a higher energy saving efficiency and a slower activity decay over a 120-h continuous operation in comparison to RuO₂ electrolyzer.

Palabras clave:

electrólisis de agua con membrana de intercambio aniónico rutenato de bismuto estructura electrónica local reacción de evolución de oxígeno adsorción de intermedios de oxígeno

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