Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (6): 60101-060101.doi: 10.11889/j.0253-3219.2016.hjs.39.060101

• SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS •     Next Articles

In situ XAFS characterization of bimetallic nanoparticle catalysts PtCo/C structure changes in the working conditions

SHANG Mingfeng1, ZHAO Tiantian2, BAO Hongliang1, DUAN Peiquan1, LIN Rui2, HUANG Yuying1, WANG Jianqiang1   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Zhangjiang Campus, Shanghai 201204, China;
    2 School of Automotive Studies, Tongji University, Shanghai 201804, China
  • Received:2016-03-30 Revised:2016-04-13 Online:2016-06-10 Published:2016-06-12
  • Supported by:

    Supported by the Major Project of Chinese National Programs for Fundamental Research and Development (973 Program)(No.2013CB933104), National Natural Science Foundation of China (No.91127001, No.11079005)

Abstract:

Background: The proton exchange membrane fuel cell (PEMFC) is considered as one of the most promising clean energy sources in the future, because of its high energy density and simple construction.However, the large scale commercial application of fuel cell is limited by the factors such as cost, durability and reliability.Purpose: For the purpose of reducing the cost and improving the performance of the PEMFC, transition metal elements alloy Pt nanoparticles (PtFe/C, PtCo/C, PtNi/C) catalysts have been studied in recent years.Methods: In situ X-ray absorption fine structure (XAFS) experimental testing device for PEMFC on beamline (BL14W1) of XAFS spectroscopy at the Shanghai Synchrotron Radiation Facility (SSRF) is conducted to explore the nanostructure changes of PtCo/C during the fuel cell operation.Results: In situ XAFS spectra indicts that Pt, and Co are gradually being reduced as the voltage of fuel cell decreases.Ex-situ XAFS spectra show Pt and Co did not form Pt-Co bond, but there is a strong Co-O bond and Co-O-Co bond.Conclusion: The element of Co improves the performance of PtCo/C catalysts for the oxygen reduction reaction (ORR) and decreases the cost of fuel cells by regulating the electronic structure of Pt.

Key words: PEMFC, In situ, XAFS, Nanostructure changes

CLC Number: 

  • TL99