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Hydrogen Production and Utilization in a Membrane Reactor
Published on: March 10, 2023
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PtSe2 /Pt Heterointerface with Reduced Coordination for Boosted Hydrogen Evolution Reaction.
Zongpeng Wang1, Beibei Xiao2, Zhiping Lin1
1School of Advanced study, Taizhou University, Taizhou, China.
Angewandte Chemie (International Ed. in English)
|August 9, 2021
Summary
Platinum diselenide (PtSe2) shows sluggish hydrogen evolution reaction (HER) kinetics. Constructing a PtSe2/Pt heterointerface with Se vacancies significantly enhances HER activity, outperforming commercial Pt/C catalysts.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Noble metal dichalcogenides (NMDs) like PtSe2 are promising for electronics and photonics.
- PtSe2 exhibits insufficient active species absorption, limiting its efficiency in hydrogen evolution reactions (HER).
Purpose of the Study:
- To enhance the HER kinetics of PtSe2 by constructing a PtSe2/Pt heterointerface.
- To investigate the role of Se vacancies and Pt atom activation in improving catalytic performance.
Main Methods:
- In situ electrochemical method to create PtSe2/Pt heterointerfaces.
- Characterization of Se vacancies and electronic structure changes.
- Electrochemical testing for HER activity (overpotential, Tafel slope).
Main Results:
- Se vacancies were induced at the PtSe2/Pt heterointerface, reducing coordination and activating adjacent Pt atoms.
- Enhanced overlap between activated Pt atoms and H 1s orbitals strengthened H* adsorption.
- The PtSe2/Pt catalyst achieved an overpotential of 42 mV at 10 mA/cm² and a Tafel slope of 53 mV/dec, surpassing Pt/C.
Conclusions:
- The constructed PtSe2/Pt heterointerface effectively boosts HER activity.
- Se vacancies play a crucial role in activating Pt sites for efficient hydrogen evolution.
- This study offers insights into designing advanced NMD-based electrocatalysts for HER.
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