DataVXACS Energy LettersPaper
journal article·2021-01-08Open access

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

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

ACS Energy Letters· Volume 6· Issue 1
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Source abstract

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.
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Research context

NanomaterialsCatalysis & surfaces

OpenAlex topics: CO2 Reduction Techniques and Catalysts · Ionic liquids properties and applications · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Electrical and Computer Engineering, University of Toronto, 35 St. George Street, Toronto, Ontario M5S 1A4, Canada

Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy

Department of Mechanical and Industrial Engineering, University of Toronto, 5 King’s College Road, Toronto, Ontario M5S 3G8, Canada

Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea

Funding

Ontario Research Foundation · Total · H2020 Marie Sklodowska-Curie Actions · Natural Sciences and Engineering Research Council of Canada

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