Polyvinylpyrrolidone‐Coordinated Single‐Site Platinum Catalyst Exhibits High Activity for Hydrogen Evolution Reaction

The essence of developing a Pt‐based single‐atom catalyst (SAC) for hydrogen evolution reaction (HER) is the preparation of well‐defined and stable single Pt sites with desired electrocatalytic efficacy. Herein, we report a facile approach to generate uniformly dispersed Pt sites with outstanding HE...

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Bibliographic Details
Published in:Angewandte Chemie 2020-09, Vol.132 (37), p.16036-16041
Main Authors: Li, Can, Chen, Zheng, Yi, Hong, Cao, Yi, Du, Lei, Hu, Yidong, Kong, Fanpeng, Kramer Campen, Richard, Gao, Yunzhi, Du, Chunyu, Yin, Geping, Zhang, Igor Ying, Tong, Yujin
Format: Article
Language:English
Subjects:
Catalysts
Chemical synthesis
Chemistry
electrocatalysis
electrochemistry
Electronic structure
Hydrogen
hydrogen evolution reaction
Hydrogen evolution reactions
Hydrogen-based energy
Photochemicals
photochemistry
Platinum
Polyvinylpyrrolidone
Single atom catalysts
water splitting
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Summary:The essence of developing a Pt‐based single‐atom catalyst (SAC) for hydrogen evolution reaction (HER) is the preparation of well‐defined and stable single Pt sites with desired electrocatalytic efficacy. Herein, we report a facile approach to generate uniformly dispersed Pt sites with outstanding HER performance via a photochemical reduction method using polyvinylpyrrolidone (PVP) molecules as the key additive to significantly simplify the synthesis and enhance the catalytic performance. The as‐prepared catalyst displays remarkable kinetic activities (20 times higher current density than the commercially available Pt/C) with excellent stability (76.3 % of its initial activity after 5000 cycles) for HER. EXAFS measurements and DFT calculations demonstrate a synergetic effect, where the PVP ligands and the support together modulate the electronic structure of the Pt atoms, which optimize the hydrogen adsorption energy, resulting in a considerably improved HER activity. Ligand‐like, polyvinylpyrrolidone molecules stabilize single‐atom Pt during UV‐induced photoreduction on titanium oxide nanorods encapsulated by graphitic carbon. The resulting material shows extremely high activity toward the hydrogen evolution reaction.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.202005282