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 languageEnglish
Article number10.1039/d0ra09763b
Pages (from-to)43585–43591
Number of pages7
JournalRSC Advances
Volume10
Issue number71
DOIs
Publication statusPublished - 9 Dec 2020

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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