Sn‐Triggered Bridging‐Oxygen of lr─O─Ru Deprotonation Enhances Acidic Oxygen Evolution Reaction
Abstract
ABSTRACT The development of efficient and stable electrocatalysts for the oxygen evolution reaction (OER) is crucial for advancing the commercialization of proton exchange membrane water electrolyzers (PEMWEs). Here, we report a ternary oxide catalyst, Ir‐RuSnO x , in which atomically dispersed Ir substitutes surface Ru sites to construct an Ir─O─Ru atomic interface. The catalyst requires an overpotential of only 165 mV to deliver 10 mA cm − 2 and maintains stable operation for over 350 h at 100 mA cm − 2 . When integrated into a PEMWE, Ir‐RuSnO x sustains continuous operation at 1 A cm − 2 for 800 h without observable degradation. Combined electrochemical and theoretical studies reveal that Sn acting as a strong electron donor, enhances electron localization at the bridging oxygen (O bri ) within the Ir─O─Ru motif. This enables O bri as a proton acceptor, facilitating deprotonation of O─H and OO─H species at Ru sites, thereby forming O bri ─H intermediates, lowering the energy barrier of the rate‐determining step (RDS), and accelerating OER kinetics. Simultaneously, Sn incorporation increases the electron density of the Ir─O─Ru structure, strengthening its resistance against oxidative degradation. These findings offer a path to achieving both high activity and long‐term durability in acidic OER electrocatalysts.
Article Details
Authors (12)
Yanqin Li
Key Laboratory of Advanced Catalysis, Gansu Province; State Key Laboratory of Natural Product Chemistry, College of Chemistry and Chemical Engineering
Bin Fang
Proteomics and Metabolomics Core, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA.
Chunlin Li
Key Laboratory of Advanced Catalysis, Gansu Province; State Key Laboratory of Natural Product Chemistry, College of Chemistry and Chemical Engineering
Shirui Cui
Key Laboratory of Advanced Catalysis, Gansu Province; State Key Laboratory of Natural Product Chemistry, College of Chemistry and Chemical Engineering Lanzhou University Lanzhou Gansu China
Chunyang Zhao
Key Laboratory of Advanced Catalysis, Gansu Province; State Key Laboratory of Natural Product Chemistry, College of Chemistry and Chemical Engineering
Wei Hu
Chen Cao
Key Laboratory of Advanced Catalysis, Gansu Province; State Key Laboratory of Natural Product Chemistry, College of Chemistry and Chemical Engineering
Nianliang Yin
School of Materials Science and Engineering Dongguan University of Technology Dongguan Guangdong China
Jing Du
Wenlong Wang
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Zelong Li
Key Laboratory of Advanced Catalysis, Gansu Province; State Key Laboratory of Natural Product Chemistry, College of Chemistry and Chemical Engineering
Can Li
State Key Laboratory of Catalysis