期刊
CARBON
卷 202, 期 -, 页码 81-89出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2022.11.014
关键词
Oxygen reduction reaction; Hyper-cross-linked polymer; Porous carbon nanotube; Selectivity; Heteroatom doping
This study reports the fabrication of porous carbon nanotubes derived from a self-supporting hyper-cross-linked polymer, and the introduction of heteroatoms by pyrolysis and oxygen plasma treatment, resulting in highly efficient oxygen reduction reaction (ORR) catalytic performance and tunable selectivity.
Exploring metal-free, highly active and durable electrocatalysts with tunable selectivity toward oxygen reduction reaction (ORR) still remains a standing challenge. Herein, porous carbon nanotubes derived from a selfsupporting hyper-cross-linked polymer with tailored selectivity for efficient ORR are reported. The sulfurcontaining tubular polymer provides a versatile platform to fabricate diverse heteroatom doped porous carbon nanotubes. Attributed to the porous tubular morphology, abundant dopants and defects, the N-doped porous carbon nanotubes through pyrolysis under Ar-NH3 show excellent 4e(-) ORR performance with a half-wave potential (E-1/2) of 0.85 V. It also has superior stability and methanol tolerance. Meanwhile, the O, S co-doped porous carbon nanotubes through oxygen plasma treatment show enhanced 2e(-) ORR performance with a selectivity up to 85.4%, which is probably ascribed to the more C=O and COOH species introduced in the carbon matrix. This work not only provides a useful strategy to design and prepare efficient ORR catalysts, but also paves the avenue for the facile tailoring of selectivity in ORR process.
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