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Cobalt nanoparticle catalysed graphitization and the effect of metal precursor decomposition temperature

Goldie, Stuart J; Jiang, Shan; Coleman, Karl S

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Authors

Stuart J Goldie

Shan Jiang



Abstract

Porous carbon foams hold great promise for supercapacitors and next generation energy storage materials but greater control over the formation of the pore structure would aid the development of these materials. High temperature graphitization has been investigated as a sustainable method of producing these technologically important materials and the addition of transition metals is known to promote the formation of graphitic carbon and potentially control the pore structure, however the effect of different metal precursors has rarely been examined. Using different cobalt salts, specifically Co(OAc)2, CoCl2 and Co(NO3)2, in a dextran/TritonX-45 aerogel graphitization, the foams produced were analyzed using Raman spectroscopy, XRD, thermal analysis, gas sorption and various electron microscopy techniques. These revealed that when using salts with low thermal stability such as Co(NO3)2 and Co(OAc)2 the metal nanoparticles are formed rapidly and become trapped in the carbon matrix causing uniform graphitization. In contrast, when stable salts are used such as CoCl2 the carbon decomposes before metal reduction and large metal crystals, microns in size, are formed. This control of nanoparticle size through understanding the thermal stability of metal precursors should be general to other widely used reagents to inform the rational design and production of future functional materials.

Citation

Goldie, S. J., Jiang, S., & Coleman, K. S. (2021). Cobalt nanoparticle catalysed graphitization and the effect of metal precursor decomposition temperature. Materials Advances, 2(10), 3353-3361. https://doi.org/10.1039/d1ma00125f

Journal Article Type Article
Acceptance Date Mar 31, 2021
Online Publication Date Apr 13, 2021
Publication Date May 21, 2021
Deposit Date Apr 1, 2021
Publicly Available Date Aug 9, 2021
Journal Materials Advances
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 2
Issue 10
Pages 3353-3361
DOI https://doi.org/10.1039/d1ma00125f

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