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Electronic metal-support interaction modulates single-atom platinum catalysis for hydrogen evolution reaction.

Yi Shi1, Zhi-Rui Ma2, Yi-Ying Xiao2

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Controlling the oxidation states of single-atom platinum catalysts via metal-support interactions enhances their activity for the hydrogen evolution reaction (HER) in both acidic and alkaline conditions. This research clarifies the structure-activity relationship for HER catalysis.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Metal-support interactions are crucial for tuning catalyst properties.
  • Understanding the atomic-level structure-activity relationship in heterogeneous catalysis, particularly for the hydrogen evolution reaction (HER), remains a challenge.

Purpose of the Study:

  • To investigate how controlling the oxidation states of single-atom platinum (Pt) catalysts impacts their activity for HER in both acidic and alkaline media.
  • To establish the structure-activity relationship for HER by correlating catalytic performance with catalyst properties.

Main Methods:

  • Utilized electronic metal-support interactions to fine-tune Pt oxidation states.
  • Employed detailed spectroscopic and electrochemical characterizations.
  • Correlated HER activity with the average oxidation state of single-atom Pt and Pt-H/Pt-OH interactions.

Main Results:

  • Fine control over Pt oxidation states significantly modulated catalytic activities for both acidic and alkaline HER.
  • Established a clear correlation between HER activity and the average oxidation state of single-atom Pt.
  • Linked catalytic performance to the specific interactions of Pt with hydrogen (Pt-H) or hydroxyl (Pt-OH) species.

Conclusions:

  • The study elucidates the atomic-level mechanisms governing acidic and alkaline HER.
  • Provides a framework for designing high-performance single-atom catalysts by precisely controlling metal-support interactions and oxidation states.