Synthesis of structurally ordered platinum-iron catalysts with enhanced oxygen reduction reaction activity

Authors

Ye-zheng CAI, State Key Laboratory of Chemical Resource Engineering, School of Science，Beijing University of Chemical Technology, Beijing100029, China;
Ming-chuan LUO, State Key Laboratory of Chemical Resource Engineering, School of Science，Beijing University of Chemical Technology, Beijing100029, China;
Fang-hui WANG, State Key Laboratory of Chemical Resource Engineering, School of Science，Beijing University of Chemical Technology, Beijing100029, China;
Zhao-nan SUN, State Key Laboratory of Chemical Resource Engineering, School of Science，Beijing University of Chemical Technology, Beijing100029, China;
Hong ZHU, State Key Laboratory of Chemical Resource Engineering, School of Science，Beijing University of Chemical Technology, Beijing100029, China;Follow

Corresponding Author

Hong ZHU(zhuho128@126.com)

Abstract

To improve oxygen reduction reaction catalytic activity of the precious metals platinum for fuel cell, the precursors of carbon-supported structurally disordered platinum-iron alloy (D-Pt₃Fe/C and D-PtFe/C) catalysts with different compositions were synthesized via a modified polyol reduction method. Then, by optimizing the annealing conditions in the inert gas, we turned the structurally disordered platinum-iron alloy to the structurally ordered platinum-iron alloy (O-Pt₃Fe/C and O-PtFe/C) catalysts. The structural characterizations of the as-prepared catalysts were performed by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and X-ray photoelectron spectroscopy (XPS). The results showed that the as-prepared structurally ordered platinum-iron alloy nanoparticles with a small size in edge length of 4 ~ 6 nm were highly dispersed on the carbon support. The electrocatalytic performances of the as-prepared catalysts were evaluated by cyclic voltammetry (CV) and linear sweep voltammetry (LSV). It was found that the catalytic activity of O-PtFe/C was enhanced as compared to that of O-Pt₃Fe/C. The mass activity and specific activity of O-PtFe/C are 271.54 mA•g^-1_Ptand 0.73 mA•cm^-2_Pt, respectively, which are 4.3 and 7.3 times higher than those of commercial JM Pt/C catalyst. The catalytic activities of both the as-prepared structurally ordered platinum-iron alloy catalysts for oxygen reduction reaction were higher than that of JM Pt/C catalyst.

Graphical Abstract

Keywords

catalysts, platinum-iron alloy, structurally ordered, oxygen reduction reaction

DOI Link

https://doi.org/10.13208/j.electrochem.151147

Publication Date

2016-04-28

Online Available Date

2016-03-04

Revised Date

2016-02-25

Received Date

2015-12-30

Recommended Citation

Ye-zheng CAI, Ming-chuan LUO, Fang-hui WANG, Zhao-nan SUN, Hong ZHU. Synthesis of structurally ordered platinum-iron catalysts with enhanced oxygen reduction reaction activity[J]. Journal of Electrochemistry, 2016 , 22(2): 185-191.
DOI: 10.13208/j.electrochem.151147
Available at: https://jelectrochem.xmu.edu.cn/journal/vol22/iss2/9