Improved oxygen reduction performance of a N, S co-doped graphene-like carbon prepared by a simple carbon bath method

YE Xiao-wen; HU Li-bing; LIU Min-cong; WANG Gang; YU Feng

doi:10.1016/S1872-5805(20)60506-6

Volume 35 Issue 5

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YE Xiao-wen, HU Li-bing, LIU Min-cong, WANG Gang, YU Feng. Improved oxygen reduction performance of a N, S co-doped graphene-like carbon prepared by a simple carbon bath method. New Carbon Mater., 2020, 35(5): 531-539. doi: 10.1016/S1872-5805(20)60506-6

Citation:

YE Xiao-wen, HU Li-bing, LIU Min-cong, WANG Gang, YU Feng. Improved oxygen reduction performance of a N, S co-doped graphene-like carbon prepared by a simple carbon bath method. New Carbon Mater., 2020, 35(5): 531-539. doi: 10.1016/S1872-5805(20)60506-6

Citation:

YE Xiao-wen, HU Li-bing, LIU Min-cong, WANG Gang, YU Feng. Improved oxygen reduction performance of a N, S co-doped graphene-like carbon prepared by a simple carbon bath method. New Carbon Mater., 2020, 35(5): 531-539. doi: 10.1016/S1872-5805(20)60506-6

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Improved oxygen reduction performance of a N, S co-doped graphene-like carbon prepared by a simple carbon bath method

doi: 10.1016/S1872-5805(20)60506-6

Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China

Funds: National Natural Science Foundation of China (21865025).

Received Date: 2019-06-25
Rev Recd Date: 2020-04-28
Publish Date: 2020-10-28

Abstract

Abstract

Rationally designing and optimizing metal-free electrocatalysts for the oxygen reduction reaction (ORR) is of great importance for fuel cells and metal-air batteries, but remains a great challenge. A N,S-codoped graphene-like carbon (GLC) was synthesized by a simple carbon-bath pyrolysis method, in which urea and thiourea (1:1 w/w) were used as both the sacrificial template and source of nitrogen and sulfur, and glucose as the carbon precursor. A mixture of these materials was placed in a crucible that was contained in a larger crucible full of carbon powder. Compared with N-doped or S-doped GLCs synthesized using only urea or thiourea, respectively, the N,S-codoped GLC had a pore volume of 0.63 cm³/g and a larger specific surface area of 583.68 m²/g, the highest micropore to total surface area of 29.39% and micropore to total pore volume of 12.70%, and the highest pyridinic-N and graphitic-N content of up to 92.2%. The N,S-codoped GLC showed a high electrocatalytic activity for ORR with a mid-wave potential (E_1/2) of 0.82 V_RHE, which was more positive than that of Pt/C (E_1/2=0.80 V_RHE) in an alkaline electrolyte. The N,S-codoped GLC catalyst had better stability and superior methanol tolerance compared with commercial Pt/C (20 wt%), a benchmark catalyst.
- Graphene-like carbon,
- Metal-free catalyst,
- Carbon bath method,
- Oxygen reduction reaction,
- Methanol tolerance

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References

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