Architecture of PtFe/C catalyst with high activity and durability for oxygen reduction reaction
Pt3Fe@Pt–FeOx architecture, activity, durability, oxygen reduction reaction, proton exchange membrane fuel cell
A PtFe/C catalyst has been synthesized by impregnation and high-temperature reduction followed by acid-leaching. X-ray diffraction, X-ray photoelectron spectroscopy and X-ray atomic near edge spectroscopy characterization reveal that Pt3Fe alloy formation occurs during high-temperature reduction and that unstable Fe species are dissolved into acid solution. The difference in Fe concentration from the core region to the surface and strong O–Fe bonding may drive the outward diffusion of Fe to the highly corrugated Pt-skeleton, and the resulting highly dispersed surface FeOx is stable in acidic medium, leading to the construction of a Pt3Fe@Pt–FeOx architecture. The as prepared PtFe/C catalyst demonstrates a higher activity and comparable durability for the oxygen reduction reaction compared with a Pt/C catalyst, which might be due to the synergetic effect of surface and subsurface Fe species in the PtFe/C catalyst.
Tsinghua University Press
Jiayuan Li,Guoxiong Wang,Jing Wang,Shu Miao,Mingming Wei,Fan Yang,Liang Yu,Xinhe Bao, Architecture of PtFe/C catalyst with high activity and durability for oxygen reduction reaction. NanoRes.2014, 7(10): 1519–1527