碳基材料对Mg_2Ni合金储氢性能催化研究

Research on the catalysis effect of carbon based materials on the hydrogen storage properties of Mg_2Ni alloy

采用熔炼法制备铸态Mg_2Ni合金,利用球磨法制备质量分数为5%Mg_2Ni-Ni碳基复合材料(石墨,氧化石墨,石墨烯),系统研究球磨样品的电化学及动力学储氢性能.研究发现,添加催化剂后Mg_2Ni合金的放电容量增大,循环稳定性提高;石墨烯及氧化石墨可明显增强Mg_2Ni合金表面催化活性,加快氢原子在合金体相内的扩散速率,而石墨的催化效果不明显.

The as-cast Mg 2Ni alloy was prepared by melting method and Mg 2Ni-Ni-5%carbon matrix composites(graphite,graphite oxide,graphene)were prepared by ball milling method.The electrochemical and kinetic hydrogen storage properties of ball milling samples were systematically studied.It was found that the discharge capacity of Mg 2Ni alloy increased and the circulation stability also increased after adding the catalyst.Graphene and graphite oxide can significantly enhance the surface catalytic activity of Mg 2Ni alloy and accelerate the diffusion rate of hydrogen in the alloy phase,while the catalytic effect of graphite is not obvious.