CO2 Electroreduction to Formate at a Partial Current Density of 930 mA cm-2 with InP Colloidal Quantum Dot Derived Catalysts
- CO2 Electroreduction to Formate at a Partial Current Density of 930 mA cm-2 with InP Colloidal Quantum Dot Derived Catalysts
- 원다혜; 이반 그리기오니; 라미 키쇼 사가; 유광 리; 이건희; 유 얀; 코엔 번즈; 류 카이 마오; 슈에 왕; 지하드 아베드; 펠라이오 아쿼; 알렉산더 입; 데이비드 신톤; 에드워드 사전트
- Carbon dioxide; Electrochemical reaction; formate; Colloidal Quantum Dot
- Issue Date
- ACS energy letters
- VOL 6, NO 1-84
- 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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