Universität zu Köln

Kim, Seonghee, Ji, Seulgi, Yang, Hyeonsu, Son, Hyunjee, Choi, Heechae ORCID: 0000-0002-9390-6607, Kang, Jun ORCID: 0000-0002-1797-4878 and Li, Oi L. (2022). Near surface electric field enhancement: Pyridinic-N rich few-layer graphene encapsulating cobalt catalysts as highly active and stable bifunctional ORR/OER catalyst for seawater batteries. Appl. Catal. B-Environ., 310. AMSTERDAM: ELSEVIER. ISSN 1873-3883

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Abstract

Rechargeable seawater batteries (SWBs) are recently considered as a new approach in next-generation energy storage. However, the presence of chloride ions inhibits the performance and durability of the air cathode electrocatalysts. This study is the first research to report the effect of the built-in electric field on corrosion prevention via Cl- repulsion. Our DFT model successfully demonstrated the near-surface charge transfer at the interface of cobalt core and pyridinic-N graphene (Co (fcc)/N-Gr) strongly contributed to advanced catalytic activity and selectively Cl- repulsion in seawater electrolyte. Experimentally, the structure of a few layered N doped graphene encapsulated cobalt (Co 4 mmol-N/C) showed superior catalytic activity in both alkaline (delta E (E-j=10 E-1/2) = 0.774 V) and seawater (delta E = 1.167 V). Furthermore, Co 4 mmol-N/C demonstrated an extremely low overpotential (0.56 V) at 0.1 mA and presented superior stability for 100 h in a rechargeable SWB.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kim, Seonghee UNSPECIFIED UNSPECIFIED UNSPECIFIED Ji, Seulgi UNSPECIFIED UNSPECIFIED UNSPECIFIED Yang, Hyeonsu UNSPECIFIED UNSPECIFIED UNSPECIFIED Son, Hyunjee UNSPECIFIED UNSPECIFIED UNSPECIFIED Choi, Heechae UNSPECIFIED orcid.org/0000-0002-9390-6607 UNSPECIFIED Kang, Jun UNSPECIFIED orcid.org/0000-0002-1797-4878 UNSPECIFIED Li, Oi L. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-672816
DOI:	10.1016/j.apcatb.2022.121361
Journal or Publication Title:	Appl. Catal. B-Environ.
Volume:	310
Date:	2022
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1873-3883
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language OXYGEN REDUCTION REACTION; NITROGEN-DOPED GRAPHENE; EFFICIENT ELECTROCATALYST; TRANSITION-METAL; CARBON; CELL; NANOPARTICLES; EVOLUTION; NANOSTRUCTURES; NANOARRAYS Multiple languages Chemistry, Physical; Engineering, Environmental; Engineering, Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67281