Precise Atomic Structure Regulation of Single-Atom Platinum Catalysts toward Highly Efficient Hydrogen Evolution
Chunqiao Jin1, Liuxiang Huo1, Jianli Tang1
1Technical Center for Multifunctional Magneto-Optical Spectroscopy (Shanghai), Engineering Research Center of Nanophotonics & Advanced Instrument (Ministry of Education), Department of Physics, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, China.
Small (Weinheim an Der Bergstrasse, Germany)
|November 22, 2023
Summary
Noble metal single-atom-catalysts (SACs) show promise for hydrogen evolution reaction (HER) catalysis. Precisely anchoring platinum single atoms on Ni(OH)2 edges significantly boosts activity and stability in neutral/alkaline media.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Noble metal single-atom-catalysts (SACs) offer high atom efficiency for hydrogen evolution reaction (HER).
- Challenges persist in optimizing SACs' active sites and catalytic activity, particularly in neutral/alkaline environments, leading to slow kinetics and instability.
- Rational design of SACs is crucial for advancing HER performance.
Purpose of the Study:
- To precisely construct platinum single atoms anchored on the edge of 2D layered Ni(OH)2 (Pt-Ni(OH)2-E).
- To investigate the enhanced catalytic activity and stability of Pt-Ni(OH)2-E compared to Pt anchored on the basal plane (Pt-Ni(OH)2-BP).
- To provide insights into designing high-performance SACs for HER.
Main Methods:
- In situ electrodeposition was employed to anchor platinum single atoms onto the edge sites of 2D layered Ni(OH)2.
- Electrochemical characterization techniques were used to evaluate the catalytic performance for HER.
- Comparison of catalytic properties between edge-anchored (Pt-Ni(OH)2-E) and basal plane-anchored (Pt-Ni(OH)2-BP) SACs.
Main Results:
- Pt-Ni(OH)2-E exhibited superior electron affinity and intrinsic catalytic activity compared to Pt-Ni(OH)2-BP.
- The engineered catalyst demonstrated strong adsorption and rapid dissociation of water molecules.
- Low overpotentials of 21 mV (alkaline) and 34 mV (neutral) were required to achieve 10 mA cm-2.
- A high mass activity of 23.6 A mg-1 (Pt) at 100 mV overpotential was achieved, surpassing existing catalysts and commercial Pt/C.
Conclusions:
- Precise anchoring of Pt single atoms on Ni(OH)2 edges creates highly active and stable HER catalysts.
- The Pt-Ni(OH)2-E catalyst shows exceptional performance in neutral and alkaline media.
- This study offers valuable strategies for the rational design of advanced single-atom catalysts for efficient hydrogen production.
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