Deposition of Bismuth Nanoplatelets onto Graphene Foam for Electrocatalytic CO2Reduction

Yakov Shitrit, Maheshwaran Duraiyarasu, Jitendra Kumar, Siva Reddy, Assaf Ya'akobovitz, Yaron S. Cohen, Eran Edri

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Bismuth nanoplatelets are efficient electrocatalysts for reducing carbon dioxide to formate─a promising renewable energy storage media. Yet, while various promising catalyst supports are acid-sensitive, deposition of Bi on these supports is hindered by the Bi3+ ions' solubility, which is limited to low pH values (<2). Here, we used monometallic and bimetallic Bi thiolate precursors to electrodeposit metallic Bi nanoplatelets from a pH-neutral solution. Analysis of the electrochemical deposition mechanism revealed an intricate kinetic balance between the electron transfer and precursor dissociation steps and a stronger tendency toward instantaneous nucleation and growth when the bimetallic precursor was used. In continuance, the nanoplatelets electrodeposited from the bimetallic precursor were thinner than the nanoplatelets electrodeposited from the monometallic precursor. They exhibited an ∼120 mV lower overpotential at 5 mA/cm2 for reduction of CO2 to formate. Both electrocatalysts yielded high faradaic efficiency (∼95%) for formate generation when deposited on a flat support. Finally, a highly conformal coating of graphene foam with Bi nanoplatelets was obtained, which yielded a low onset potential (∼350 mV vs RHE) for CO2 reduction to formate. This work establishes a facile route for coating acid-sensitive supports with functional coatings using thiolate-based precursors for the first time. It also lays out the reaction mechanism and correlation between the precursor structure-electrodeposit structure and functionality.

Original languageEnglish
Pages (from-to)16354-16364
Number of pages11
JournalACS Applied Nano Materials
Volume5
Issue number11
DOIs
StatePublished - 25 Nov 2022

Keywords

  • Bismuth electrocatalysts
  • Carbon dioxide reduction
  • Electrodeposition
  • Formate
  • Graphene foam

ASJC Scopus subject areas

  • General Materials Science

Fingerprint

Dive into the research topics of 'Deposition of Bismuth Nanoplatelets onto Graphene Foam for Electrocatalytic CO2Reduction'. Together they form a unique fingerprint.

Cite this