Journal
ADVANCED SCIENCE
Volume 9, Issue 23, Pages -Publisher
WILEY
DOI: 10.1002/advs.202201654
Keywords
electrochemical catalysis; oxygen evolution reaction; proton-exchange membrane water electrolyzer; RuO2; water electrolysis
Categories
Funding
- National Natural Science Foundation of China [22171266]
- FJIRSMAMP
- IUE Joint Research Fund [RHZX2019-002]
- STS project [KFJ-STS-QYZD-2021-09-002]
- CAS-Shanghai Science Research Center
- Experiment Assist System of SSRF
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In this study, a Co-HMT metal-organic framework was used as the precursor, and a fast-quenching method was employed to synthesize a catalyst with RuO2 nanorods loaded on ATO. The optimized catalyst exhibited a small overpotential and stable performance, enabling it to reach a certain current density at a low voltage in practical applications.
Future energy demands for green hydrogen have fueled intensive research on proton-exchange membrane water electrolyzers (PEMWE). However, the sluggish oxygen evolution reaction (OER) and highly corrosive environment on the anode side narrow the catalysts to be expensive Ir-based materials. It is very challenging to develop cheap and effective OER catalysts. Herein, Co-hexamethylenetetramine metal-organic framework (Co-HMT) as the precursor and a fast-quenching method is employed to synthesize RuO2 nanorods loaded on antimony-tin oxide (ATO). Physical characterizations and theoretical calculations indicate that the ATO can increase the electrochemical surface areas of the catalysts, while the tensile strains incorporated by quenching can alter the electronic state of RuO2. The optimized catalyst exhibits a small overpotential of 198 mV at 10 mA cm(-2) for OER, and keeps almost unchanged after 150 h chronopotentiometry. When applied in a real PEMWE assembly, only 1.51 V is needed for the catalyst to reach a current density of 1 A cm(-2).
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