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Electronic Structure Engineering of Single-Atom Tungsten on Vacancy-enriched V3S4 Nanosheets for Efficient Hydrogen
Min Xi1, Hua Zhang1, Lingfeng Yang1
1Yunnan Key Laboratory of Electromagnetic Materials and Devices, School of Materials and Energy, Yunnan University, Kunming, 650091, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 28, 2024
Summary
Researchers developed a novel tungsten single-atom catalyst on V3S4 nanosheets for efficient hydrogen evolution. This advanced catalyst shows high activity and stability in alkaline solutions, paving the way for large-scale hydrogen production.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Optimizing single-atom catalysts (SACs) is crucial for enhancing hydrogen evolution reaction (HER) kinetics.
- Tuning metal-support electronic interactions in SACs is a key strategy for improved catalytic performance.
Purpose of the Study:
- To develop a novel single-atom catalyst for efficient hydrogen evolution.
- To investigate the anchoring of tungsten single atoms onto V3S4 nanosheets using a sulfur vacancy defect trapping strategy.
Main Methods:
- Synthesis of ultrathin V3S4 nanosheets.
- Anchoring tungsten single atoms onto V3S4 via sulfur vacancy defects.
- Electrochemical characterization of the W-V3S4 catalyst for HER.
- Density functional theory (DFT) calculations to elucidate the electronic structure and catalytic mechanism.
Main Results:
- Achieved a high loading of tungsten single atoms (25.1 wt.%) on V3S4 nanosheets.
- The W-V3S4 catalyst demonstrated a low overpotential of 54 mV at 10 mA cm-2.
- Exhibited excellent long-term stability in alkaline electrolytes.
- DFT calculations confirmed enhanced electron density delocalization and improved water dissociation and hydrogen adsorption/desorption.
Conclusions:
- The sulfur vacancy defect trapping strategy effectively anchors tungsten single atoms, creating highly active HER catalysts.
- The W-V3S4 catalyst shows significant potential for large-scale, efficient hydrogen production in alkaline media.
- Understanding the electronic structure modulation is key to designing advanced single-atom catalysts.
