期刊论文

Effect and Mechanism of Separate Doping of Graphene and Ni and Their Co-doping on Dehydrogenation Properties of MgH_2

Sun Liqin

中文

稀有金属材料与工程

1002-185X

2016

45

12

3207-3212

国家自然科学基金资助项目（51401036） 中国博士后基金资助项目（2013M531790） 湖南省自然科学基金资助项目（14JJ3086） 湖南省教育厅优秀青年基金资助项目（12B001） 能源高效清洁利用湖南省高校重点实验室开放基金项目（2013NG006）

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采用高能球磨技术制备了MgH_2、MgH_2-Graphene、MgH_2-Ni、MgH_2-Graphene-Ni几种不同储氢体系,采用XRD、 SEM、DSC等检测手段表征了不同体系的物相组成、微观形貌及释氢性能,系统研究了Graphene与Ni单独、复合掺杂对MgH_2释氢性能的影响及机理。结果表明:Graphene单独掺杂致使MgH_2体系初始释氢温度降低了近33 ℃,其原因在于球磨过程中Graphene对MgH_2颗粒起到结构限域作用,使其颗粒细化且尺寸均匀。Ni单独掺杂致使MgH_2体系初始释氢温度大幅度降低,降低了136 ℃,其原因在于部分Ni原子固溶进MgH_2基体,导致其晶格变形、结构稳定性降低。而Graphene与Ni复合掺杂时,其掺杂顺序对MgH_2体系释氢性...

Several different hydrogen storage systems including MgH2, MgH2-Graphene, MgH2-Ni and MgH2-Graphene-Ni were synthesized by a high energy ball milling technique. The phase compositions, microstructures and dehydrogenation properties of different systems were characterized by the testing methods such as X-ray diffraction, scanning electron microscope and differential scanning calorimeter. The effect of separate doping and co-doping of Graphene and Ni on dehydrogenation properties of MgH2and the mechanism were also studied. Results show that the initial dehydrogenation temperature of Graphene-dop...