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Pt-C Interfaces Based on Electronegativity-Functionalized Hollow Carbon Spheres for Highly Efficient Hydrogen

Xiao Shang1, Zi-Zhang Liu1, Shan-Shan Lu1

  • 1State Key Laboratory of Heavy Oil Processing, Institute of New Energy , China University of Petroleum (East China) , Qingdao 266580 , P. R. China.

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|December 7, 2018
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Summary

Nitrogen-doped hollow carbon spheres (HCS) enhance platinum catalyst activity for hydrogen evolution reactions by creating optimal Pt-C interfaces. This approach offers superior performance and stability compared to commercial catalysts.

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Pt counter electrodePt−C interfaceselectrodissolutionhollow carbonhydrogen evolution reactionnitrogen functional groupsproton capture

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Area of Science:

  • Catalysis
  • Materials Science
  • Electrochemistry

Background:

  • The efficiency of platinum (Pt) catalysts for the hydrogen evolution reaction (HER) is significantly influenced by the interface between Pt nanoparticles and the carbon support.
  • Understanding the role of surface functional groups on carbon supports is crucial for optimizing catalyst performance in acidic media.

Purpose of the Study:

  • To investigate the impact of nitrogen (N) and oxygen (O) functional groups on hollow carbon spheres (HCS) as a substrate for Pt catalysts in HER.
  • To elucidate the structure-activity relationships at the Pt-C interface influenced by N/O functionalization.

Main Methods:

  • Preparation of Pt nanoparticles with low loading on N- or O-functionalized HCS via electrochemical dissolution of a Pt counter electrode.
  • Electrochemical characterization of the synthesized catalysts to evaluate HER activity and stability.
  • Analysis of nanoparticle morphology and distribution in relation to surface functional groups.

Main Results:

  • N-functionalized HCS promote homogeneous Pt nanoparticle size, while O-functionalized HCS lead to aggregation.
  • N groups facilitate proton capture and transfer to Pt sites, creating proton-rich interfaces.
  • Pt catalysts on N-doped HCS exhibit higher intrinsic activity and stability than those on O-doped HCS and commercial 20% Pt/C.
  • Optimized N-doped HCS with low Pt loading (1.7 μg cm-2) show enhanced catalytic efficiency.

Conclusions:

  • Surface functionalization of carbon supports with N groups is advantageous for constructing highly active and stable Pt-based electrocatalysts for HER.
  • The electronegativity and proton-capturing ability of functional groups play a critical role in determining the Pt-C interface properties and catalytic performance.
  • This study provides insights for designing advanced carbon supports with tailored functional groups to improve electrocatalytic efficiencies.