【摘要】 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。更多还原

【Abstract】 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/cm2.更多还原