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다차원탄소재료연구단
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Oxygen-doped TiN entrapped in N-doped porous graphitic carbon promotes sulfur cathode kinetics

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Title
Oxygen-doped TiN entrapped in N-doped porous graphitic carbon promotes sulfur cathode kinetics
Author(s)
Sun, L.; Meng, X.; Zhang, J.; Meng, Y.; Wang, M.; Zhou, X.; Chen, C.; Zhou, J.; Christopher W. Bielawski; Geng, J.
Publication Date
2023-08
Journal
Journal of Power Sources, v.575
Publisher
Elsevier B.V.
Abstract
The hybridization of carbon materials with metal compounds is a promising approach for designing advanced composites. However, the standard methodologies are often limited in practical terms by the complicated synthetic routes and/or an inability to control the structures of the resulting materials. Herein, we describe a one-pot strategy for synthesizing a N-doped porous graphitic carbon that is hybridized with oxygen-doped titanium nitride (designated O–TiN@N-PGC) and show that the composite displays outstanding chemisorption and electrocatalytic effects in sulfur cathodes. The method employs urea as nitrogen source and thus avoids the use of dangerous and toxic ammonia gas. The unique structure of O–TiN promotes the electrocatalytic conversion of sulfur species found in sulfur cathodes. Li–S cells that are prepared using the O–TiN@N-PGC as a sulfur host exhibit remarkable performance in terms of specific capacity (1408 mA h g−1 at 0.1 C), rate capacity (604 mA h g−1 at 4 C), and cycling stability (513 mA h g−1 after 1000 cycles at 0.5 C). Moreover, an areal capacity of 7.6 mA h cm−2 is achieved under a high sulfur loading of 5.7 mg cm−2. The results establish a facile and efficient strategy for integrating metal nitrides in porous carbons, particularly for use in contemporary energy technologies. © 2023 Elsevier B.V.
URI
https://pr.ibs.re.kr/handle/8788114/13617
DOI
10.1016/j.jpowsour.2023.233173
ISSN
0378-7753
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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