利用循环伏安法探究Pt与Fe共沉积的还原电位,并在此电位下在多孔碳布表面恒压电沉积制备Pt-Fe合金,研究其作为质子交换膜燃料电池(PEMFC)阴极催化剂的电催化活性.通过X射线衍射(XRD)、扫描电子显微镜(SEM)及场发射扫描电子显微镜(FESEM)、能量色散谱(EDS)、循环伏安(CV)、单电池极化、电化学交流阻抗谱(EIS)等测试技术对所得催化剂进行物理及电化学性能表征.实验表明,在0.075V电位下可还原得到Pt-Fe合金,其颗粒在碳布表面呈空心球状且分散均匀;共沉积时间对Pt-Fe合金催化剂成分组成有显著的影响,随着时间的增加,合金中Pt与Fe原子比增加,Fe相对含量下降.Fe可与Pt形成稳定的合金催化剂,显著提高铂对氧还原的催化活性.电沉积30 min制得的合金催化剂具有最佳的催化活性.
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