Electrocatalytic property of nitrogen-doped graphite-supported CeO2-CoOx

Ben Ge; Tonglian Yue; Jinmei Liu; Xu Wu; Bo Chen; Yongkang Li; Zhibin Yang

doi:10.1088/2053-1591/abefef

Materials Research Express (Jan 2021)

Electrocatalytic property of nitrogen-doped graphite-supported CeO2-CoOx

Ben Ge,
Tonglian Yue,
Jinmei Liu,
Xu Wu,
Bo Chen,
Yongkang Li,
Zhibin Yang

Affiliations

Ben Ge: ORCiD; Department of Materials Science and Engineering, China University of Mining and Technology Beijing , Beijing 100083, People’s Republic of China
Tonglian Yue: School of Chemical and Environmental Engineering, China University of Mining and Technology Beijing , Beijing 100083, People’s Republic of China
Jinmei Liu: School of Chemical and Environmental Engineering, China University of Mining and Technology Beijing , Beijing 100083, People’s Republic of China
Xu Wu: Department of Materials Science and Engineering, China University of Mining and Technology Beijing , Beijing 100083, People’s Republic of China
Bo Chen: Department of Materials Science and Engineering, China University of Mining and Technology Beijing , Beijing 100083, People’s Republic of China
Yongkang Li: School of Chemical and Environmental Engineering, China University of Mining and Technology Beijing , Beijing 100083, People’s Republic of China
Zhibin Yang: School of Chemical and Environmental Engineering, China University of Mining and Technology Beijing , Beijing 100083, People’s Republic of China

DOI: https://doi.org/10.1088/2053-1591/abefef
Journal volume & issue: Vol. 8, no. 3
p. 035510

Abstract

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Ceria has been widely used as a catalyst in photocatalysis, automobile exhaust purification, and organic degradation. However, ceria has poor intrinsic catalytic performance and usually requires modifications. In this study, N-doped graphite was used as a substrate, and then CeO _2 -CoO _x was attached to N-doped graphite. Afterward, the effects of the recombination with N-doped graphite and those of Co doping on the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalytic ability of CeO _2 were studied. The experimental results showed that the electrocatalytic performance of CeO _2 -CoO _x /N-rGO is higher than that of pure CeO _2 and CeO _2 /N-rGO. After the N-doped graphite recombination, the number of transferred electrons increased at high potential, which fully illustrates that graphite can effectively reduce the overpotential of ORR. The 0.56 eV shift of the C1s in CeO _2 -CoO _x /N-rGO to high binding energy revealed that CeO _2 -CoO _x and N-rGO were combined with each other through covalent bonds. In addition, the increased pyridine nitrogen of N-rGO after the recombination improved the electrocatalytic performance of CeO _2 -CoO _x /N-rGO. Overall, the catalytic ability of CeO _2 was greatly improved, and the modified CeO _2 -CoO _x /N-rGO composite showed better catalytic performance for the ORR and OER compared with Pt/C and RuO _2 .

Published in Materials Research Express

ISSN: 2053-1591 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials; Technology: Chemical technology
Website: https://iopscience.iop.org/journal/2053-1591

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