期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 14, 页码 5752-5761出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta00439k
关键词
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资金
- National Natural Science Foundation of China [21722704]
- Science and Technology Commission of Shanghai Municipality [16DZ1204300, 15DZ2281400, 16JC1401700]
Here we demonstrate a facile strategy for tuning the dimensions and structures of nitrogen-doped carbon nanomaterials via regulating the ratio of Co/Zn in zeolitic imidazolate framework (ZIF) arrays in situ grown on g-C3N4 nanosheets, followed by a pyrolysis process. One-dimensional nitrogen-doped bamboo-like carbon nanotube encapsulated Co nanoparticle (Co/N-BCNTs), two-dimensional nitrogen-doped carbon nanosheet (N-CNS) and three-dimensional nitrogen-doped carbon nanotube framework encapsulated Co nanoparticle (Co/N-CNTFs) electrocatalysts are successfully fabricated from Zn/Co-ZIF@g-C3N4, ZIF-8@g-C3N4 (Co free) and ZIF-67@g-C3N4 (Zn free), respectively. The resulting Co/N-BCNTs electrocatalyst exhibits a better oxygen reduction reaction (ORR) activity than the other two catalysts, with a half-wave potential of 0.83 V (versus the reversible hydrogen electrode) in alkaline solutions, which is superior to that of a commercial Pt/C catalyst. More importantly, the Co/N-BCNTs show much higher stability and better methanol-tolerance than the Pt/C catalyst in a 0.1 M KOH solution. It has been demonstrated that the enhanced catalytic performance of Co/N-BCNTs is attributed to their suitable surface area, well-dispersed N dopants, and Co encapsulated inside carbon nanotubes. The presented strategy offers new prospects in developing highly active electrocatalysts.
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