CO2 Electroreduction to Formate at a Partial Current Density of 930 mA cm-2 with InP Colloidal Quantum Dot Derived Catalysts

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Ivan Grigioni
  • Laxmi Kishore Sagar
  • Yuguang C. Li
  • Geonhui Lee
  • Yu Yan
  • Koen Bertens
  • Rui Kai Miao
  • Jehad Abed
  • Da Hye Won
  • F. Pelayo Garciá de Arquer
  • Alexander H. Ip
  • David Sinton
  • Edward H. Sargent

Detail(s)

Original languageEnglish
Pages (from-to)79-84
Journal / PublicationACS Energy Letters
Volume6
Issue number1
Online published8 Dec 2020
Publication statusPublished - 8 Jan 2021
Externally publishedYes

Abstract

We report formate production via CO2 electroreduction at a Faradaic efficiency (FE) of 93% and a partial current density of 930 mA cm-2, an activity level of potential industrial interest based on prior techno-economic analyses. We devise a catalyst synthesized using InP colloidal quantum dots (CQDs): The capping ligand exchange introduces surface sulfur, and XPS reveals the generation, operando, of an active catalyst exhibiting sulfur-protected oxidized indium and indium metal. Surface indium metal sites adsorb and reduce CO2 molecules, while sulfur sites cleave water and provide protons. The abundance of exposed surface indium sites per quantum dot enables the high formate productivity achieved at low catalyst loadings. The high conductivity of the layer of nanoparticles under negative potential sustains the large current densities.

Research Area(s)

Citation Format(s)

CO2 Electroreduction to Formate at a Partial Current Density of 930 mA cm-2 with InP Colloidal Quantum Dot Derived Catalysts. / Grigioni, Ivan; Sagar, Laxmi Kishore; Li, Yuguang C. et al.
In: ACS Energy Letters, Vol. 6, No. 1, 08.01.2021, p. 79-84.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review