Facile synthesis of defect-rich nitrogen and sulfur Co-doped graphene quantum dots as metal-free electrocatalyst for the oxygen reduction reaction

Tianju Fan, Guangxing Zhang, Lingfeng Jian, Imran Murtaza, Hong Meng, Yidong Liu, Yong Min

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

Carbon-based metal-free nanomaterials have attracted immense and persistent attention as electrocatalysts for oxygen reduction reaction (ORR) in fuel cells, due to their high electrocatalytic activity, long-term stability and low cost. Here, a facile hydrothermal treatment in the presence of ammonium hydroxide (NH4OH) and sodium sulfide (Na2S), as precursors, has been developed to synthesize heteroatom-doped graphene quantum dots (GQDs). For comparison, undoped graphene quantum dots (GQDs), nitrogen doped graphene quantum dots (N-GQDs), sulfur doped graphene quantum dots (S-GQDs) and nitrogen and sulfur co-doped graphene quantum dots (N,S-GQDs) have been synthesized with the same method. The as-obtained N,S-GQDs possess a high N-doping content up to 9.36% and low S-doping content up to 0.78%, with a uniform size distribution similar to that of GQDs, N-GQDs and S-GQDs. Interestingly, the multi-types of N[sbnd]C or C[sbnd]S[sbnd]C bonding in metal free N,S-GQDs can significantly enhance the electrocatalytic activity for the oxygen reduction reaction (ORR), with the electron transfer number as good as 3.82, which verify the importance of our facile synthesis method to fabricate metal-free electrocatalysts for ORR and other electrochemical applications.

Original languageEnglish
Pages (from-to)844-850
Number of pages7
JournalJournal of Alloys and Compounds
Volume792
DOIs
StatePublished - 5 Jul 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 Elsevier B.V.

Funding

The authors gratefully acknowledge financial support of Guangdong Innovative and Entrepreneurial Research Team Program (No. 2016ZT06C412 ), the International Cooperation and Exchange Program under grant between the National Natural Science Foundation of China and Pakistan Science Foundation (No. 5161101159 and PSF-NSFC-II/Eng/C-IIUI-06 ), the National Basic Research Program of China (973 Program, No. 2015CB856505 ), Shenzhen Science and Technology Research Grants ( GJHZ20160229122304608 ), and Shenzhen Maker Special Project Program ( GRCK20170424144331753 ). The authors gratefully acknowledge financial support of Guangdong Innovative and Entrepreneurial Research Team Program (No. 2016ZT06C412), the International Cooperation and Exchange Program under grant between the National Natural Science Foundation of China and Pakistan Science Foundation (No. 5161101159 and PSF-NSFC-II/Eng/C-IIUI-06), the National Basic Research Program of China (973 Program, No. 2015CB856505), Shenzhen Science and Technology Research Grants (GJHZ20160229122304608), and Shenzhen Maker Special Project Program (GRCK20170424144331753).

FundersFunder number
Shenzhen Maker Special Project ProgramGRCK20170424144331753
Shenzhen Science and Technology Research GrantsGJHZ20160229122304608
Pakistan Science Foundation
Guangdong Innovative and Entrepreneurial Research Team Program2016ZT06C412
National Natural Science Foundation of ChinaPSF-NSFC-II/Eng/C-IIUI-06, 5161101159
International Cooperation and Exchange Programme
National Basic Research Program of China (973 Program)2015CB856505

    Keywords

    • Metal-free electrocatalyst
    • Nitrogen and sulfur Co-doped graphene quantum dots
    • Oxygen reduction reaction

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