摘要
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0.075 V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。
Pt-Fe alloy for proton exchange membrane fuel cell （PEMFC） cathode catalyst was prepared on the porous carbon cloth by electrodeposition under the constant voltage. The reduction potential was determined by cyclic voltammetry （CV）. The physical and electrochemical performances of catalysts were characterized by X-ray difffraction （XRD）, scanning electron microscope （SEM）, field emission scanning electron microscope （FESEM）, energy dispersive spectrograph （EDS）, cyclic voltammetry （CV）, single cell polarization test and in-situ electrochemical impedance spectroscopy （EIS） technique. The results show that the highly-dispersed Pt-Fe alloy catalyst is obtained by electrodeposition at 0.075 V. The electrodeposition time has remarkable effect on the compositions of Pt-Fe alloy. The ratio of Pt to Fe increases with the co-deposition time. Fe can sufficiently improve the catalytic activity of Pt for oxygen reduction reaction （ORR）. Pt-Fe alloy catalyst electrodeposited for 30 min shows better catalytic activity for ORR than pure Pt catalyst.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第11期1217-1222,共6页
Journal of Inorganic Materials
基金
江苏高校优势学科建设资助项目~~
关键词
循环伏安
还原电位
Pt-Fe合金
氧还原
质子交换膜燃料电池
cyclic voltammetry
reduction potential
Pt-Fe alloy
oxygen reduction
proton exchange membrane fuel cell
