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Reactive template synthesis of nitrogen-doped graphene-like carbon nanosheets derived from hydroxypropyl methylcellulose and dicyandiamide as efficient oxygen reduction electrocatalysts
Hu, Chun1,2; Zhou, Yao1; Ma, Ruguang1; Liu, Qian1,3; Wang, Jiacheng1,3
2017
Source PublicationJournal of Power Sources
ISSN03787753
Volume345Pages:120-130
AbstractOxygen reduction reaction (ORR) plays a dominant role in proton exchange membrane fuel cells (PEMFCs). Thus, the design and preparation of efficient ORR electrocatalysts is of high importance. In this work, we successfully prepared a series of nitrogen-doped graphene-like carbon nanosheets (NCNSs) with large pore volumes of up to 1.244 cm3 g−1and high level of N dopants (5.3–6.8 at%) via a one-step, in-situ reactive template strategy by co-pyrolysis of hydroxypropyl methylcellulose (HPMC) and dicyandiamide (DICY) as the precursors at 1000 °C. The DICY-derived graphitic carbon nitride (g-C3N4) nanosheets could act as the hard template for the confined growth of 2D carbon nanosheets, and the further increase in the pyrolysis temperature could directly remove off the g-C3N4template by complete decomposition and simultaneously dope N atoms within the carbon nanosheets. The pyridinic and graphitic nitrogen groups are dominant among various N functional groups in the NCNSs. The NCNS_1:10 prepared with the HPMC/DICY mass ratio of 1/10 can be used as the metal-free ORR electrocatalysts with optimal activity (onset potential: −0.1 V vs. SCE; limiting current density: 4.8 mA cm−2) in O2-saturated 0.1 M KOH electrolyte among the NCNSs. Moreover, the NCNS_1:10 demonstrates a dominant four-electron reduction process, as well as excellent long-term operation stability and outstanding methanol crossover resistance. The excellent ORR activity of the NCNS_1:10 should be mainly owing to high contents of pyridinic and graphitic N dopants, large pore volume, hierarchical structures, and microstructural defects. © 2017 Elsevier B.V.
DOI10.1016/j.jpowsour.2017.01.124
EI Accession Number20170703339415
EI KeywordsProton exchange membrane fuel cells (PEMFC)
EI Classification Number702.2 Fuel Cells - 761 Nanotechnology - 802.2 Chemical Reactions - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally - 804.2 Inorganic Compounds - 921.6 Numerical Methods - 933 Solid State Physics
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Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/25365
Collection中国科学院上海硅酸盐研究所
Affiliation1.State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai; 200050, China;
2.University of the Chinese Academy of Sciences, Beijing; 100049, China;
3.Shanghai Institute of Materials Genome, Shanghai, China
Recommended Citation
GB/T 7714
Hu, Chun,Zhou, Yao,Ma, Ruguang,et al. Reactive template synthesis of nitrogen-doped graphene-like carbon nanosheets derived from hydroxypropyl methylcellulose and dicyandiamide as efficient oxygen reduction electrocatalysts[J]. Journal of Power Sources,2017,345:120-130.
APA Hu, Chun,Zhou, Yao,Ma, Ruguang,Liu, Qian,&Wang, Jiacheng.(2017).Reactive template synthesis of nitrogen-doped graphene-like carbon nanosheets derived from hydroxypropyl methylcellulose and dicyandiamide as efficient oxygen reduction electrocatalysts.Journal of Power Sources,345,120-130.
MLA Hu, Chun,et al."Reactive template synthesis of nitrogen-doped graphene-like carbon nanosheets derived from hydroxypropyl methylcellulose and dicyandiamide as efficient oxygen reduction electrocatalysts".Journal of Power Sources 345(2017):120-130.
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