Grigioni, Ivan Sagar, Laxmi Kishore Li, Yuguang C. Lee, Geonhui Yan, Yu Bertens, Koen Miao, Rui Kai Wang, Xue Abed, Jehad Won, Da Hye de Arquer, F. Pelayo Garcia Ip, Alexander H. Sinton, David Sargent, Edward H. 2024-01-19T15:33:20Z 2024-01-19T15:33:20Z 2021-09-02 2021-01-08 2380-8195 https://pubs.kist.re.kr/handle/201004/117541 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. English AMER CHEMICAL SOC CARBON-DIOXIDE REDUCTION INDIUM NANOCRYSTALS ELECTRODES SURFACE XPS CO2 Electroreduction to Formate at a Partial Current Density of 930 mA cm(-2) with InP Colloidal Quantum Dot Derived Catalysts Article 10.1021/acsenergylett.0c02165 1 ACS ENERGY LETTERS, v.6, no.1, pp.79 - 84 ACS ENERGY LETTERS 6 1 79 84 scie scopus 000609250200010 2-s2.0-85097768926 Chemistry, Physical Electrochemistry Energy & Fuels Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Science & Technology - Other Topics Materials Science Article CARBON-DIOXIDE REDUCTION INDIUM NANOCRYSTALS ELECTRODES SURFACE XPS Carbon dioxide Electrochemical reaction formate Colloidal Quantum Dot