Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 40, Pages 13187-13191Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201807854
Keywords
chiral carbonaceous nanotubes; cobalt; electrocatalysis; oxygen reduction reaction
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Funding
- National Natural Science Foundation of China [21101170, 21573139, 21601118, 21773146]
- Thousand Talents Program of China
- Fundamental Research Funds for the Central Universities [GK201703021]
- Starting Research Funds of Shaanxi Normal University
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The oxygen reduction reaction (ORR) is of significant importance in the development of fuel cells. Now, cobalt-nitrogen-doped chiral carbonaceous nanotubes (L/D-CCNTs-Co) are presented as efficient electrocatalysts for ORR. The chiral template, N-stearyl-L/D-glutamic acid, induces the self-assembly of well-arranged polypyrrole and the formation of ordered graphene carbon with helical structures at the molecular level after the pyrolysis process. Co was subsequently introduced through the post-synthesis method. The obtained L/D-CCNTs-Co exhibits superior ORR performance, including long-term stability and better methanol tolerance compared to achiral Co-doped carbon materials and commercial Pt/C. DFT calculations demonstrate that the charges on the twisted surface of L/D-CCNTs are widely separated; as a result the Co atoms are more exposed on the chiral CCNTs. This work gives us a new understanding of the effects of helical structures in electrocatalysis.
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