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The effect of the alkyl chain length of the tetraalkylammonium cation on CO2 electroreduction in an aprotic medium |
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| Institution: | 1. Centre for Green Chemistry and Catalysis, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China;3. National Nanotechnology Research Center, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh 11442, Saudi Arabia;1. Graduate School of Engineering, Toyota Technological Institute, 2-12-1 Hisakata, Tempaku, Nagoya 468-8511, Japan;2. Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan;3. Institute for Catalysis, Hokkaido University, N-21 W-10, Kita-ku, Sapporo 001-0021, Japan |
| Abstract: | The effect of tetraalkylammonium cation (TAA+) chain length on CO2 electroreduction is investigated on an Ag electrode in a DMF solution. Linear sweep voltammetric (LSV) studies show that the onset potentials of CO2 reduction move to increasingly negative potentials upon increasing the alkyl chain length of the tetraalkylammonium cation of the supporting electrolyte. Density functional theory (DFT) computations indicate that the onset potential of CO2 reduction is dependent on the strength of ion pairing between TAA+ cation and the electrogenerated CO2.?. CO2 disturbance experiments reveal that the peak current of CO2 reduction is determined by the quantity of TAA+ cation adsorbed on the Ag surface. |
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