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Raj, Kumar Bera
나노물질 및 화학반응 연구단
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Engineering Active Sites in Three-Dimensional Hierarchically Porous Graphene-Like Carbon with Co and N-Doped Carbon for High-Performance Zinc-Air Battery

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Title
Engineering Active Sites in Three-Dimensional Hierarchically Porous Graphene-Like Carbon with Co and N-Doped Carbon for High-Performance Zinc-Air Battery
Author(s)
Raj Kumar Bera; Hongjun Park; Ryong Ryoo
Publication Date
2021-11
Journal
CHEMELECTROCHEM, v.8, no.21, pp.4038 - 4046
Publisher
John Wiley and Sons Inc
Abstract
© 2021 Wiley-VCH GmbHThe design of active sites plays an important role in developing highly active oxygen electrocatalysts in Zn-air batteries (ZnABs). Here, we report the formation of cobalt (Co) nanoparticles and thin graphitic N-doped carbon (NC) supported on three-dimensional hierarchically porous graphene-like carbon (Co-NC/3DHPGC) to maximize the accessibility of Co-NC active sites for oxygen reduction/evolution reactions (ORR/OER). The produced Co-NC/3DHPGC exhibits a broad size distribution (5–30 nm) of Co nanoparticles dispersed on the external surface of 3DHPGC and coated with NC to a thickness of ∼2 nm. We attributed the formation of Co nanoparticles with broad size distribution to the hierarchical porosity of 3DHPGC, which served as a cage to stabilize the Co nanoparticles and increase the metal dispersion; the produced Co nanoparticles catalyze the formation of graphitic NC. Compared with commercial Pt/C and RuO2 catalysts, the resultant Co-NC/3DHPGC exhibits excellent bifunctional ORR/OER electrocatalytic activity and high durability. The high electrocatalytic performance is ascribed to the accessibility of highly active Co-NC sites through mesopores of 3DHPGC. The ZnAB assembled with Co-NC/3DHPGC exhibits high energy density and efficiency. This systematic engineering and rational synthesis strategy may provide new insight into the development of high-performance oxygen electrocatalysts for metal-air batteries and fuel cell technology.
URI
https://pr.ibs.re.kr/handle/8788114/10614
DOI
10.1002/celc.202100807
ISSN
2196-0216
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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