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Oriented proton migration through Ru-O-W channels for durable oxygen evolution in acid
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PRE
AI
H
J
M
S
H
H
李
Z
D
Z
肖
DOI：10.1007/s11426-026-3512-2.png)
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Abstract
En 中文
RuO2 has been considered a promising alternative to the extremely expensive IrO2-based benchmark anode of proton exchange membrane water electrolysis devices; however, its rapid degradation in acidic water oxidation has hindered its large-scale deployment in those devices. Probing the deterioration behaviors is crucial for constructing stable RuO2-based anodes. Here, using time-of-flight secondary ion mass spectrometry, ion implantation, and operando X-ray absorption spectroscopy methods, we demonstrate that the excess retention of protons on Ru-O sites due to water dissociation is the culprit of the fast deconstruction, and we construct a RuO2/WO3 interface, where WO3 acts as a proton reservoir to suppress the *H accumulation on RuO2, thereby achieving a cell voltage of 1.59 V at 500 mA cm−2 and a decay rate of 0.22 µV s−1 for 380 h constant-current electrolysis in a typical proton exchange membrane electrolyzer.
Keywords:
oxygen evolution reaction
oriented proton migration
Ru-O-W channels
ion implantation experiments
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