Ag原位负载催化剂的制备及表征综合实验设计

摘要

设计一个关于锂空气电池催化剂的制备及其催化性能研究的综合实验.采用自交换法结合HF同步刻蚀,在集流体泡沫镍表面原位生成了Ag纳米枝晶电极材料.利用X射线衍射技术、场发射扫描电镜配接X射线谱仪对这种新型复合材料进行成分分析与形貌表征,通过恒电流放电及电化学线性伏安测试评价了材料的电化学性能.结果表明,Ag纳米枝晶在泡沫镍表面均匀分布,将其应用于锂空气电池,在电流密度为1 A/m2时,电池的放电容量从4 774.4 mA·h/g增加到8 203.8 mA·h/g,电催化性能良好.%A new energy materials comprehensive electrochemical experiment was designed.A galvanic exchange method was applied to in situ deposit Ag on the Ni foam and to prepare an electrode.The production was characterized by X-ray diffraction (XRD),scanning electron-microscope (SEM) and energy dispersive X-ray spectroscopy (EDS) for the analyses in the aspect of structure and morphology.The as-prepared porous Ag@Ni foam was applied as the current collector of air cathode for the Li-air battery,and the electrochemical performances were evaluated by galvanostatic discharge and cyclic voltammetry (CV).The results show that when the current density is 1 A/m2,the capacity is increased from 4 774.4 mA · h/g carbon to 8 203.8 mA · h/g carbon.In this design the synthesis method was simple and controllable.Students' understanding of the structure and properties of electrode materials can be deepened by the experiment,the experiment also benefits their cultivation of innovation consciousness and comprehensive experimental ability.