Ambolikar, Arvind S. and Guin, Saurav K. and Neogy, Suman (2019) An insight into the outer- and inner-sphere electrochemistry of oxygenated single-walled carbon nanohorns (o-SWCNHs). New Journal of Chemistry, 43 (46). pp. 18210-18219. ISSN 1144-0546

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Abstract

The extremely large surface areas as well as connecting nanopores of single-walled carbon nanohorn (SWCNH) aggregates have been tested, for the first time to the best of our knowledge, as metal-free, stable and cheap electrocatalysts for heterogeneous electron transfer reactions involving inorganic redox couples, including f-block elements such as actinides. From systematic studies of heterogeneous electron transfer reactions, the electrochemically reversible outer-sphere heterogeneous surface insensitive electron transfer reaction involving [Ru(NH3)6]3+/[Ru(NH3)6]2+ and the electrochemically near-to-reversible inner-sphere heterogeneous surface sensitive electron transfer reaction involving [Fe(CN)6]3−/[Fe(CN)6]4− on oxygenated SWCNHs (i.e., o-SWCNHs) have been compared to heterogeneous electron transfer involving the quasi-reversible [U(VI)O2(CO3)3]4−/[U(V)O2(CO3)3]5− redox reaction on o-SWCNHs. It was evident that the oxygen containing functional groups of o-SWCNH could catalyze the electron transfer process between uranium species in solution and the working electrode happened by following surface-sensitive inner-sphere electron transfer mechanism. Furthermore, the electrochemical stability, repeatability and reproducibility of the o-SWCNH modified glassy carbon electrode were found to be analytically acceptable for studying the electrochemistry of uranium in alkaline solutions with high ionic strength.

Item Type:	Article
Keywords:	electrochemistry; oxygenated; single-walled; carbon nanohorns;
Academic Unit:	Faculty of Science and Engineering > Chemistry
Item ID:	16195
Identification Number:	https://doi.org/10.1039/C9NJ04467A
Depositing User:	Saurav Kumar Guin
Date Deposited:	29 Jun 2022 08:05
Journal or Publication Title:	New Journal of Chemistry
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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