title: Highly Functional Bioinspired Fe/N/C Oxygen Reduction Reaction Catalysts: Structure-Regulating Oxygen Sorption.
abstract: Tuna is one of the most rapid and distant swimmers. Its unique gill structure with the porous lamellae promotes fast oxygen exchange that guarantees tuna's high metabolic and athletic demands. Inspired by this specific structure, we designed and fabricated microporous graphene nanoplatelets (GNPs)-based Fe/N/C electrocatalysts for oxygen reduction reaction (ORR). Careful control of GNP structure leads to the increment of microporosity, which influences the O2 adsorption positively and desorption oppositely, resulting in enhanced O2 diffusion, while experiencing reduced ORR kinetics. Working in the cathode of proton-exchange membrane fuel cells, the GNP catalysts require a compromise between adsorption/desorption for effective O2 exchange, and as a result, appropriate microporosity is needed. In this work, the highest power density, 521 mW·cm(-2), at zero back pressure is achieved.
authors.forename: Yingfang
authors.initials: Y
authors.lastname: Yao
authors.forename: Yong
authors.initials: Y
authors.lastname: You
authors.affiliation: Institut National de la Recherche Scientifique - Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada.
authors.forename: Gaixia
authors.initials: G
authors.lastname: Zhang
authors.affiliation: Kunshan Sunlaite New Energy Co., Ltd., 1699# South Zuchongzhi Road, Suzhou, Kunshan, 215347, China.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Liu
authors.forename: Haoran
authors.initials: H
authors.lastname: Sun
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Zou
authors.affiliation: Institut National de la Recherche Scientifique - Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada.
authors.forename: Shuhui
authors.initials: S
authors.lastname: Sun
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D007501:Iron / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*
chemical_list: D002244:Carbon; D007501:Iron; D009584:Nitrogen; D010100:Oxygen
keywords: graphene nanoplatelets; microporosity; nonprecious metal catalyst; oxygen reduction reaction; proton-exchange membrane fuel cells