Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (9): 20220294.doi: 10.7503/cjcu20220294

• Article • Previous Articles     Next Articles

Single-atom Cerium Sites Designed for Durable Oxygen Reduction Reaction Catalyst with Weak Fenton Effect

CHU Yuyi1,2, LAN Chang1,2, LUO Ergui3, LIU Changpeng1,2, GE Junjie1,2(), XING Wei1,2()   

  1. 1.State Key Laboratory of Electroanalytical Chemistry,Jilin Province Key Laboratory of Low Carbon Chemical Power,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    2.College of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei 230026,China
    3.Key Laboratory of Magnetic Molecules and Magnetic Information Materials,Ministry of Education,School of;Chemistry and Material Science,Shanxi Normal University,Taiyuan 030031,China
  • Received:2022-05-02 Online:2022-09-10 Published:2022-05-30
  • Contact: GE Junjie,XING Wei E-mail:gejj@ciac.ac.cn;xingwei@ciac.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(21633008);the National Science and Technology Major Project, China(2016YFB0101202);the Jilin Province Science and Technology Development Program, China(20200201001JC)

Abstract:

Metal-Nitrogen-Carbon(M-N-C) materials has hitherto been the most promising alternative to platinum for catalyzing the oxygen reduction reaction. However, severe degradation issues have been reported under operando testing condition, such as free radical attack generated by the Fenton reaction and the leaching of active sites, which restricted the further advance of M-N-C catalysts. Herein, single-atom Ru,Ce-N-C catalyst with Ru-N x active sites with weak fenton effect and Ce-N x sites as free radical scavenger was synthesized. The results indicated that Ru, Ce-N-C catalyst exhibits excellent oxygen reduction reaction(ORR) activity[E1/2=0.78 V(vs. RHE)] and outstanding stability(8 mV negative shift after 30000 cycles), which is superior to Fe-N-C catalyst. The electron transfer number(n) of Ru, Ce-N-C was 3.98, and the average H2O2 yield for Ru, Ce-N-C was less than 5%. This work opens the new path for improving the durability of M-N-C catalysts in fuel cells.

Key words: Oxygen reduction reaction, Single-atom catalyst, Stability, Fenton reaction, Free radical scavenging

CLC Number: 

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