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  Preparation of hard carbon/carbon nitride nanocomposites by chemical vapor deposition to reveal the impact of open and closed porosity on sodium storage

Schutjajew, K., Giusto, P., Härk, E., & Oschatz, M. (2021). Preparation of hard carbon/carbon nitride nanocomposites by chemical vapor deposition to reveal the impact of open and closed porosity on sodium storage. Carbon, 185, 697-708. doi:10.1016/j.carbon.2021.09.051.

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 Creators:
Schutjajew, Konstantin1, Author              
Giusto, Paolo2, Author              
Härk, Eneli, Author
Oschatz, Martin1, Author              
Affiliations:
1Martin Oschatz, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2364733              
2Paolo Giusto, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_3245192              

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Free keywords: sodium storage, carbon fibers, carbon nitride, closed pores, hard carbon
 Abstract: The sodium ion battery is a promising successor for the lithium-ion battery. Its energy density is limited by the anode, where sodium ideally is stored at low potentials vs. Na/Na+. The understanding of the fundamental relationships between material properties and sodium storage is often lagging behind materials development. There is a discord regarding the involvement of so-called “closed pores” in carbons in sodium storage. To investigate their influence, a chemical vapour deposition (CVD) process to deposit polymeric carbon nitride (p-C3N4) on hard carbon fibres of both, open and closed microporosity is developed. High storage capacity at a low potential is only possible, when suitable, sealed pores are present. In fibers without notable gas-accessible surface, p-C3N4 is deposited on the external area, whereas in open-microporous samples the p-C3N4 phase grows in micropores. Consequently, except for the untreated fibres with closed pores, the composite with this pore gradient is the only one in the study that is able to accommodate sodium at low potentials. Neither the remaining graphitic domains, nor the introduced p-C3N4 are able to accommodate sodium in a quasimetallic state. Finally, not only the sodium storage but also the solid-electrolyte interphase (SEI) build-up is influenced by the additional p-C3N4 layer.

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Language(s): eng - English
 Dates: 2021-09-242021
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.carbon.2021.09.051
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Title: Carbon
  Abbreviation : Carbon
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 185 Sequence Number: - Start / End Page: 697 - 708 Identifier: ISSN: 0008-6223