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Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
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Strong Oxide-Support Interaction over IrO2 /V2 O5 for Efficient pH-Universal Water Splitting.
Xiaozhong Zheng1, Minkai Qin1, Shuangxiu Ma1
1Advanced Materials and Catalysis Group, State Key Laboratory of Clean Energy Utilization, Center of Chemistry for Frontier Technologies, Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou, 310028, P. R. China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 13, 2022
Summary
Strong oxide-support interaction creates a unique iridium oxide catalyst for efficient pH-universal oxygen evolution reaction (OER) and water electrolysis, enhancing stability.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Strong oxide-support interaction (SOSI) is crucial for tuning catalyst properties.
- Developing efficient catalysts for oxygen evolution reaction (OER) is vital for water splitting.
Purpose of the Study:
- To synthesize and characterize ultrafine iridium oxide nanoclusters anchored on vanadium oxide support using SOSI.
- To investigate the enhanced performance of the IrO2/V2O5 catalyst for pH-universal OER and water electrolysis.
Main Methods:
- Synthesis of IrO2 nanoclusters on V2O5 support via SOSI.
- Electrochemical characterization for OER performance across a wide pH range.
- Experimental and theoretical calculations to elucidate the catalytic mechanism.
Main Results:
- The IrO2/V2O5 catalyst exhibits a unique distorted IrO2 structure.
- Achieved ultralow overpotentials for OER (e.g., 266 mV at pH 0) and efficient overall water electrolysis.
- Demonstrated high stability due to the SOSI-secured active sites.
Conclusions:
- The distorted IrO2 active sites facilitate O-O coupling through flexible redox states.
- SOSI is a promising strategy for designing stable and high-performance catalysts for water oxidation.
- The IrO2/V2O5 catalyst shows potential for practical applications in water electrolysis.
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