articleNature CommunicationsFeb 25, 2020GOLD OA

Uncovering near-free platinum single-atom dynamics during electrochemical hydrogen evolution reaction

SFShi FangXZXiaorong ZhuXLXiaokang LiuJGJian GuWLWei Liu

University of Science and Technology of China · National Synchrotron Radiation Laboratory · +1 more institution

PubMed
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Abstract

Abstract Single-atom catalysts offering intriguing activity and selectivity are subject of intense investigation. Understanding the nature of single-atom active site and its dynamics under working state are crucial to improving their catalytic performances. Here, we identify at atomic level a general evolution of single atom into a near-free state under electrocatalytic hydrogen evolution condition, via operando synchrotron X-ray absorption spectroscopy. We uncover that the single Pt atom tends to dynamically release from the nitrogen-carbon substrate, with the geometric structure less coordinated to support and electronic property closer to zero valence, during the reaction. Theoretical simulations support…

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Topics & keywords

Topics
Keywords
  • Overpotential
  • Catalysis
  • Valence (chemistry)
  • Electrochemistry
  • Materials science
  • Chemical physics
  • Atom (system on chip)
  • Platinum
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