Effect of preparation routes on activity of Ag-MnO_x/C as electrocatalysts for oxygen reduction reaction in alkaline media  

制备路线对碱性介质氧还原反应电催化剂Ag-MnO_x/C催化活性的影响（英文）

作　　者：伍秋美[1] 阮建明[1] 周忠诚[1] 桑商斌[2] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]中南大学化学化工学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第2期510-519,共10页中国有色金属学报（英文版）

基　　金：Project(21406273)supported by the National Natural Science Foundation of China

摘　　要：The effect of preparation routes on the physical characteristics and activity of the Ag-MnOx/C composites toward the oxygen reduction reaction （ORR） in alkaline media were studied by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, transmission electron microscopy （TEM）, energy-dispersion spectroscopy （EDS） as well as scanning electron microscopy （SEM） and electrochemical techniques. The results show that more Ag and Mn species present on the surface of the Ag-MnOx/C composite prepared by two-step route （Ag-MnOx/C-2） compared to the one prepared by one-step route （Ag-MnOx/C-1）, which contributes to its superior activity toward the ORR. The higher electron transfer number involved in the ORR can be observed on the Ag-MnOx/C-2 composite and its specific mass kinetic current at -0.6 V （vs Hg/HgO） is 46 mA/μg, which is 23 times that on the Ag/C. The peak power density of zinc-air battery with the Ag-MnOx/C-2 air electrode reaches up to 117 mW/cm^2.通过X射线衍射、X射线光电子能谱、透射电镜、扫描电镜以及能谱分析和电化学方法考察制备路线对氧还原反应(ORR)电催化剂Ag-MnOx/C物理性能及其催化活性的影响。结果表明:通过两步法制得的催化剂(Ag-MnOx/C-2)的表面Ag和Mn含量比一步法制备样品(Ag-MnOx/C-1)的高,这使得Ag-MnOx/C-2具有更高的催化活性。Ag-MnOx/C-2表面ORR的电子转移数高于Ag-MnOx/C-1的电子转移数,且在-0.60 V(相对于Hg/HgO)处的比质量动力学电流为46 mA/μg,为Ag/C的23倍。以Ag-MnOx/C-2为阴极催化剂组装的锌-空气电池的最高能量密度高达117 m W/cm2。

关 键 词：SILVER manganese oxide oxygen reduction reaction zinc-air battery ELECTROCATALYST full cell 

分 类 号：O643.36[理学—物理化学] TM911.41[理学—化学]