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Anchoring a Co/2-methylimidazole complex on ion-exchange resin and its transformation to Co/N-doped carbon as an electrocatalyst for the ORR

Authors :
Emilia Morallón
Norikazu Nishiyama
Shunsuke Tanaka
Yuichiro Hirota
Yexin Zhu
Koji Miyake
Atsushi Gabe
Yasuhiro Shu
Yoshiaki Uchida
Diego Cazorla-Amorós
Universidad de Alicante. Departamento de Química Física
Universidad de Alicante. Departamento de Química Inorgánica
Universidad de Alicante. Instituto Universitario de Materiales
Electrocatálisis y Electroquímica de Polímeros
Materiales Carbonosos y Medio Ambiente
Source :
Catalysis Science & Technology. 9:578-582
Publication Year :
2019
Publisher :
Royal Society of Chemistry (RSC), 2019.

Abstract

Synthesizing high-activity metal/heteroatom-co-doped carbon (M/H–C) electrocatalysts for the oxygen reduction reaction (ORR) is critical for the commercialization of fuel cells, but remains challenging because of the difficulty in making highly dispersed (M/H–C) electrocatalysts. Herein, a commercial ion-exchange resin, Amberlyst 15, is used as a support, and Co/2-methylimidazole is anchored on the ion-exchange site of the support to obtain Co/N/Amb as the precursor of the M/H–C electrocatalyst. After the precursor is pyrolyzed and converted into Co/N/C materials, it is activated with CO2, and the obtained material (act-Co/N/C) exhibits remarkable ORR activity with a high onset potential of 0.943 V (vs. the reversible hydrogen electrode) and an excellent kinetic current density comparable to commercial 5 wt% Pt/C in an alkaline medium. The favorable activity is mainly attributed to the ultra-dispersed CoNx and high porosity of act-Co/N/C. Our synthetic strategy could be applied to the preparation of other well-dispersed M/H–C materials. This work opens a new direction in the synthetic strategy of carbon materials. Financial support from MINECO (CTQ2015-66080-R) and HEIWA NAKAJIMA FOUNDATION is acknowledged.

Details

ISSN :
20444761 and 20444753
Volume :
9
Database :
OpenAIRE
Journal :
Catalysis Science & Technology
Accession number :
edsair.doi.dedup.....9a33c0f4e8317eb9a12dfa48d3a7796c
Full Text :
https://doi.org/10.1039/c8cy02210k