The effects of ball milling on microstructures of graphene/Ni composites and their catalytic activity for hydrogen evolution reaction

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6 Citations (Scopus)

Abstract

The effects of the ball milling on microstructures of the graphene/Ni composites and subsequent hydrogen evolution reaction in acidic solution were investigated. Ni nanoparticles with average grain size of 4 nm were uniformly dispersed on the graphene surface after short time ball milling. While amorphous characteristic was observed due to long time ball milling. The graphene/Ni composites with amorphous structure exhibited higher electrocatalytic performance than the graphene/Ni composites with nanocrystalline structure. The Volmer-Heyrovsky mechanism was found for the graphene/Ni composites with nanocrystalline structure, while the graphene/Ni composites with amorphous structure showed evident Heyrovsky mechanism. The excellent hydrogen evolution reaction and stability of the graphene/Ni composites could be attributed to superior interfacial contact, amorphous Ni, and synergistic effect between amorphous Ni and high conductive graphene.

Original languageEnglish
Pages (from-to)124-127
Number of pages4
JournalMaterials Letters
Volume206
DOIs
Publication statusPublished - 2017 Nov 1

Keywords

  • Amorphous
  • Ball milling
  • Graphene
  • Hydrogen

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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