Lee, Hae Ri Han, Seunggyun Lee, Jong Yoon Lee, Gwanwon Lee, Sungho Joh, Han-Ik 2024-01-19T08:02:20Z 2024-01-19T08:02:20Z 2024-01-04 2023-12 1226-086X https://pubs.kist.re.kr/handle/201004/113012 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. English 한국공업화학회 Effect of pre-annealing on chemical configuration and heteroatom doping of highly active carbon catalysts for the oxygen reduction reaction Article 10.1016/j.jiec.2023.08.019 1 Journal of Industrial and Engineering Chemistry, v.128, pp.542 - 549 Journal of Industrial and Engineering Chemistry 128 542 549 N scie scopus kci 001114990300001 2-s2.0-85173334065 Chemistry, Multidisciplinary Engineering, Chemical Chemistry Engineering Article 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