Selective Electrochemical Production of Formate from Carbon Dioxide with Bismuth-Based Catalysts in an Aqueous Electrolyte
| Autor: | Nark Eon Sung, Ki Dong Yang, Hyo Yong Ahn, Ki Tae Nam, Jun Ho Lee, Hongmin Seo, Jung Sug Hong, Chan Woo Lee, Kyoungsuk Jin |
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| Rok vydání: | 2018 |
| Předmět: |
Tafel equation
Reaction mechanism Chemistry Inorganic chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Heterogeneous catalysis Electrocatalyst Electrochemistry 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound Formate 0210 nano-technology Faraday efficiency |
| Zdroj: | ACS Catalysis. 8:931-937 |
| ISSN: | 2155-5435 |
| Popis: | For the efficient electroconversion of CO2 to formate, CO and H2 evolution must be suppressed. Herein, carbon-supported BiOx nanoparticles (BiOx/C) were investigated as a potential candidate for CO2 reduction. In bicarbonate solutions, the BiOx/C catalysts exhibited a high Faradaic efficiency of 93.4% for formate from −1.37 to −1.70 V versus Ag/AgCl with a negligible amount of CO and H2. Stable partial current densities and high Faradaic efficiencies were also achieved in 0.5 M NaCl (12.5 mA cm–2 and 96.0%, respectively). The possible reaction pathways and kinetic parameters of formate formation were examined using systematic electrochemical methods, including Tafel, pH dependence, and in situ X-ray absorption near-edge structure analyses. From the results of these mechanistic studies, we propose that dual mechanisms are functional on the BiOx/C catalysts. Specifically, a two-electron and one-proton transfer reaction to adsorbed CO2 or a chemical proton transfer reaction to CO2– anion are the possible rat... |
| Databáze: | OpenAIRE |
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