摘要
利用沉淀法制备纳米CuO,通过不同煅烧温度控制其晶粒尺寸。XRD测试表明,所得样品为CuO单相结构,晶粒尺寸分别为7.5,14.4nm和23.4nm。利用球磨法制备Mg_2Ni-Ni-5%(摩尔分数,下同)CuO复合材料,对材料的电化学性能、动力学性能及气态放氢活化能进行测试分析。结果表明,添加纳米CuO可明显提高材料的最大放电性能,改善Mg基复合材料电极表面的电催化活性,提高材料体相内H的扩散能力。DSC测试表明,纳米CuO复合材料比无催化剂材料的放氢温度降低约50K。通过Kissinger公式计算得到Mg_2Ni-Ni和Mg_2Ni-Ni-5%CuO600复合材料的放氢活化能分别为86.9kJ/mol和89.3kJ/mol。
Nanosized CuO particles were synthesized viaprecipitation method,and the crystalline sizes were controlled by adjusting different calcinations temperature.XRD result shows that the obtained samples exhibit CuO single phase structure,the crystalline sizes are 7.5,14.4 nm and 23.4 nm respectively.Then Mg2Ni-Ni-5%CuO composites were obtained through ball milling technique,the electrochemical hydrogen storage properties,kinetic performances and the activation energies of hydrogen desorption were tested and analyzed.The results show that the maximum discharge capacities and the electrocatalytic activity on the surface and the diffusivities of H in the bulk of the Mg-based composites electrodes are improved by adding the nanosized CuO catalysts.DSC measurement shows that the nanosized CuO catalyst leads to decrease in hydrogen desorption temperature by about 50 Kthan that of composites without CuO.The activation energies of the composites of Mg2Ni-Ni and Mg2Ni-Ni-5% CuO600,which are calculated by Kissinger formula,are 86.9 kJ/mol and 89.3 kJ/mol respectively.
作者
张国芳
翟亭亭
胡锋
侯忠辉
张羊换
许剑轶
ZHANG Guo-fang;ZHAI Ting-ting;HU Feng;HOU Zhong-hui;ZHANG Yang-huan;XU Jian-yi(School of Material and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolio,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2018年第7期151-156,共6页
Journal of Materials Engineering
基金
国家自然科学基金(51501095)
内蒙古自然科学基金(2017MS(LH)0516
2017MS(LH)0519)
