Bismuthene nanosheets produced by ionic liquid assisted grinding exfoliation and their use for oxygen reduction reaction

Manila  Ozhukil Valappil; Abhijit Ganguly; J Benson; Vijayamohanan  K. Pillai,; Subbiah  Alwarappan; P Papakonstantinou

doi:10.1039/d0ra09763b

Bismuthene nanosheets produced by ionic liquid assisted grinding exfoliation and their use for oxygen reduction reaction

Manila Ozhukil Valappil, Abhijit Ganguly, J Benson, Vijayamohanan K. Pillai,, Subbiah Alwarappan , P Papakonstantinou

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Abstract

We report the simple synthesis of bismuthene nanosheets (BiNS) by ionic liquid assisted grinding exfoliation, followed by size selection sequential centrifugation steps for the first time. The exfoliation process results in the formation of self-assembled spherule-like superstructures with abundant edge sites, which are able to catalyze the oxygen reduction reaction (ORR) via a two-electron pathway, with a higher efficiency than the bulk Bismuth. We rationalize the enhanced ORR activity of the BiNS to: (i) the presence of 1 dimensional topological edge states, which provide strong conduction channels for electron hopping between the bismuth layers and (ii) the more active role of edge sites in facilitating O2 adsorption and dissociation of O–O bonds compared to the basal plane. The present study provides a pathway for employing 2D
topological insulators as a new class of electrocatalysts for clean energy applications

Original language	English
Article number	10.1039/d0ra09763b
Pages (from-to)	43585–43591
Number of pages	7
Journal	RSC Advances
Volume	10
Issue number	71
DOIs	https://doi.org/10.1039/d0ra09763b
Publication status	Published (in print/issue) - 9 Dec 2020

Bibliographical note

Funding Information:
This work was supported by the Newton Bhabha Fund – Application Ref: 345713877 and by the INVEST Northern Ireland, Biodevices grant with Ref: RD0714186.

Publisher Copyright:
© The Royal Society of Chemistry.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Keywords

Bismuthene
topological insulator
electrocatalysis
oxygen reduction reaction
exfoliation
2D layered materials
ionic liquid assisted grinding exfoliation
self-assembly
self-organised
Bismuth nanosheets
topological edge states
2 Dimensional Materials

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10.1039/d0ra09763bLicence: CC BY-NC

Bismuthene Final published version, 1.05 MBLicence: CC BY-NC

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abstract = "We report the simple synthesis of bismuthene nanosheets (BiNS) by ionic liquid assisted grinding exfoliation, followed by size selection sequential centrifugation steps for the first time. The exfoliation process results in the formation of self-assembled spherule-like superstructures with abundant edge sites, which are able to catalyze the oxygen reduction reaction (ORR) via a two-electron pathway, with a higher efficiency than the bulk Bismuth. We rationalize the enhanced ORR activity of the BiNS to: (i) the presence of 1 dimensional topological edge states, which provide strong conduction channels for electron hopping between the bismuth layers and (ii) the more active role of edge sites in facilitating O2 adsorption and dissociation of O–O bonds compared to the basal plane. The present study provides a pathway for employing 2Dtopological insulators as a new class of electrocatalysts for clean energy applications",

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AU - Alwarappan , Subbiah

AU - Papakonstantinou, P

N1 - Funding Information: This work was supported by the Newton Bhabha Fund – Application Ref: 345713877 and by the INVEST Northern Ireland, Biodevices grant with Ref: RD0714186. Publisher Copyright: © The Royal Society of Chemistry. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

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N2 - We report the simple synthesis of bismuthene nanosheets (BiNS) by ionic liquid assisted grinding exfoliation, followed by size selection sequential centrifugation steps for the first time. The exfoliation process results in the formation of self-assembled spherule-like superstructures with abundant edge sites, which are able to catalyze the oxygen reduction reaction (ORR) via a two-electron pathway, with a higher efficiency than the bulk Bismuth. We rationalize the enhanced ORR activity of the BiNS to: (i) the presence of 1 dimensional topological edge states, which provide strong conduction channels for electron hopping between the bismuth layers and (ii) the more active role of edge sites in facilitating O2 adsorption and dissociation of O–O bonds compared to the basal plane. The present study provides a pathway for employing 2Dtopological insulators as a new class of electrocatalysts for clean energy applications

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Bismuthene nanosheets produced by ionic liquid assisted grinding exfoliation and their use for oxygen reduction reaction

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