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

Title
CO2 Electroreduction to Formate at a Partial Current Density of 930 mA cm-2 with InP Colloidal Quantum Dot Derived Catalysts
Authors
원다혜이반 그리기오니라미 키쇼 사가유광 리이건희유 얀코엔 번즈류 카이 마오슈에 왕지하드 아베드펠라이오 아쿼알렉산더 입데이비드 신톤에드워드 사전트
Keywords
Carbon dioxide; Electrochemical reaction; formate; Colloidal Quantum Dot
Issue Date
2021-01
Publisher
ACS energy letters
Citation
VOL 6, NO 1-84
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.
URI
http://pubs.kist.re.kr/handle/201004/72723
ISSN
2380-8195
Appears in Collections:
KIST Publication > Article
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