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

作者：Lv Jinlong^*; Wang Zhuqing; Miura Hideo

来源：Materials Letters, 2017, 206: 124-127.

DOI：10.1016/j.matlet.2017.07.001

• Hydrogen
• Amorphous
• Ball milling
• Graphene

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.

• 出版日期2017-11-1