Effect of pre-annealing on chemical configuration and heteroatom doping of highly active carbon catalysts for the oxygen reduction reaction

Authors
Lee, Hae RiHan, SeunggyunLee, Jong YoonLee, GwanwonLee, SunghoJoh, Han-Ik
Issue Date
2023-12
Publisher
한국공업화학회
Citation
Journal of Industrial and Engineering Chemistry, v.128, pp.542 - 549
Abstract
Heteroatom-doped carbon catalysts are promising alternatives to platinum group metal-free catalysts for oxygen reduction reaction (ORR). To enhance the ORR activity of carbonbased catalysts, the break of electroneutrality and number of active sites must be maximized. In this study, an annealing process at a mild temperature was introduced before heteroatom doping to control the content and configuration of the oxygen functional groups on the graphene oxide (GO). Pre-annealing affects the chemical configuration and the porosity of GO such that the epoxy groups are converted into carbonyl groups accompa-nying the defect formation. Interestingly, The carbonyl-enriched environment allowed ammonia borane, as a dopant with nitrogen and boron atoms, the enhanced doping performance, inducing the formation of higher number of heteroatom doping sites and additional defects in the graphene lattice. The aBNG-150 catalyst demonstrated outstanding ORR activity in both half-and single-cell evaluations because it had the highest heteroatom content and meso/macropores derived from the elimination of oxygen functional groups, which can facilitate ORR catalytic activity and O2 diffusion pathway. Therefore, we believe that this approach provides an effective route for synthesizing carbon-based catalysts with remarkable ORR performances.(c) 2023 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Keywords
REDUCED GRAPHENE OXIDE; FUEL-CELLS; NITROGEN; BORON; EFFICIENT; ELECTROCATALYSTS; SIZE; ROOM-TEMPERATURE; Pre-annealing; Heteroatom dual -doping; Chemical configuration; Balanced porosity; ORR catalyst; Reduced graphene oxide
ISSN
1226-086X
URI
https://pubs.kist.re.kr/handle/201004/113012
DOI
10.1016/j.jiec.2023.08.019
Appears in Collections:
KIST Article > 2023
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