循环伏安电沉积制备Pt-Fe合金催化剂及其性能
发布时间：2018-09-06 19:46
【摘要】：为提高质子交换膜燃料电池(PEMFC)电催化剂的催化活性,并降低其成本,利用循环伏安法电沉积制备Pt-Fe合金催化剂,并以其作为PEMFC阴极。通过X射线衍射仪(XRD)、循环伏安法(CV)、能谱仪(EDS)、扫描电子显微镜(SEM)测试技术对催化剂样品进行性能表征。通过循环伏安线性扫描法确定Pt-Fe合金的沉积电位,并探究了电沉积过程中电解液温度、电位和扫描速率对催化剂样品形貌以及电催化性能的影响。结果表明:电解液温度主要对催化剂沉积量及分散性起作用,对形貌影响不大,扫描速率主要对晶体生长产生影响;电位扫描范围为-0.4~0.6 V、扫描速率为100 m V/s,电解液温度为50℃时,电沉积得到的Pt-Fe合金催化剂的颗粒在碳布表面呈空心球状且分散均匀,与其他沉积电位制得的样品相比较,合金中Pt/Fe原子比相对较高,其具有最大的电化学活性表面积,为64.30 m2/g,电催化活性最佳。
[Abstract]:In order to improve the catalytic activity and reduce the cost of proton exchange membrane fuel cell (PEM) (PEMFC) electrocatalysts, Pt-Fe alloy catalysts were prepared by cyclic voltammetry and used as PEMFC cathodes. The performance of the catalyst was characterized by X-ray diffractometer (XRD),) cyclic voltammetry (CV),) and (EDS), scanning electron microscopy (SEM). The deposition potential of Pt-Fe alloy was determined by cyclic voltammetry, and the effects of electrolyte temperature, potential and scanning rate on the morphology and electrocatalytic performance of the catalyst were investigated. The results showed that the temperature of electrolyte mainly affected the deposition amount and dispersity of the catalyst, but had little effect on the morphology, and the scanning rate mainly affected the crystal growth. When the potential scanning range is -0.4 ~ 0.6V, the scanning rate is 100m V / s, and the electrolyte temperature is 50 鈩，
本文编号：2227361
[Abstract]:In order to improve the catalytic activity and reduce the cost of proton exchange membrane fuel cell (PEM) (PEMFC) electrocatalysts, Pt-Fe alloy catalysts were prepared by cyclic voltammetry and used as PEMFC cathodes. The performance of the catalyst was characterized by X-ray diffractometer (XRD),) cyclic voltammetry (CV),) and (EDS), scanning electron microscopy (SEM). The deposition potential of Pt-Fe alloy was determined by cyclic voltammetry, and the effects of electrolyte temperature, potential and scanning rate on the morphology and electrocatalytic performance of the catalyst were investigated. The results showed that the temperature of electrolyte mainly affected the deposition amount and dispersity of the catalyst, but had little effect on the morphology, and the scanning rate mainly affected the crystal growth. When the potential scanning range is -0.4 ~ 0.6V, the scanning rate is 100m V / s, and the electrolyte temperature is 50 鈩，
本文编号：2227361
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