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Customizing Axially-Oriented Dual-Atomic Synergy for Orchestrating Cascade Alkaline Hydrogen Evolution
Xin Wang1,2,3, Sirui Yang2,3, Wenhao Zheng2,3
1School of Materials Science and Engineering, Peking University, Beijing, China.
This study introduces a novel sulfur-bridged Ru-S-Co catalyst for efficient alkaline hydrogen evolution reaction (HER). The customized atomic synergy significantly reduces energy barriers, enabling high performance in water splitting for clean energy production.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- Multistep electrochemical reactions face kinetic bottlenecks.
- Efficient hydrogen evolution reaction (HER) is crucial for sustainable energy.
Purpose of the Study:
- To design a catalyst with synergistic atomic interactions for improved alkaline HER.
- To investigate the role of a Ru-S-Co motif in regulating reaction kinetics.
Main Methods:
- Customization of an axially-oriented, sulfur-bridged hetero-atomic motif (Ru-S-Co).
- Analysis of geometric and electronic interactions at the atomic scale.
- Electrochemical performance testing in an anion-exchange-membrane electrolysis cell.
Main Results:
- The Ru-S-Co catalyst demonstrated enhanced water capture and balanced hydrogen adsorption-desorption.
- A reduced energy barrier for the water scission step and elevated free water proportion were observed.
- The catalyst achieved a current density of 1000 mA cm⁻² at 1.79 V with excellent long-term stability.
Conclusions:
- Precise atomic-scale synergy in the Ru-S-Co catalyst effectively manages kinetic mismatches in alkaline HER.
- This approach offers insights for designing advanced catalysts for energy conversion applications.
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