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Cr dopant mediates hydroxyl spillover on RuO2 for high-efficiency proton exchange membrane electrolysis
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Cr dopant mediates hydroxyl spillover on RuO2 for high-efficiency proton exchange membrane electrolysis
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Journal Article
Cr dopant mediates hydroxyl spillover on RuO2 for high-efficiency proton exchange membrane electrolysis
2024
Overview
Simultaneously improving the activity and stability of catalysts for anodic oxygen evolution reaction (OER) in proton exchange membrane water electrolysis (PEMWE) remains a notable challenge. Here, we report a chromium-doped ruthenium dioxide with oxygen vacancies, termed Cr
0.2
Ru
0.8
O
2-x
, that drives OER with an overpotential of 170 mV at 10 mA cm
−2
and operates stably over 2000 h in acidic media. Experimental and theoretical studies show that the synergy of Cr dopant and oxygen vacancy induces an unconventional dopant-mediated hydroxyl spillover mechanism. Such dynamic hydroxyl spillover from Cr dopant to Ru active site changes the rate-determining step from OOH* formation to O
2
formation and thus greatly improves the OER performance. Moreover, the Cr dopant and oxygen vacancy also play a crucial role in stabilizing surface Ru and lattice oxygen in the Ru-O-Cr structural motif. When assembled into the anode of a practical PEMWE device, Cr
0.2
Ru
0.8
O
2-x
enables long-term durability of over 200 h at an ampere-level current density and 60 degrees centigrade.
Developing highly active and stable anode catalysts for green hydrogen production is crucial but challenging. Here, the authors report a Cr0.2Ru0.8O2-x catalyst with an unconventional dopant-mediated hydroxyl spillover mechanism for high-efficiency proton exchange membrane water electrolysis.
