Electrochemical reduction of carbon dioxide at various series of copper single crystal electrodes
| Autor: | Ichiro Takahashi, Nagahiro Hoshi, Yoshio Hori, Osamu Koga |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution Process Chemistry and Technology Inorganic chemistry Analytical chemistry chemistry.chemical_element Electrocatalyst Electrochemistry Copper Catalysis chemistry Transition metal Physical and Theoretical Chemistry Single crystal Inorganic compound Electrochemical reduction of carbon dioxide |
| Zdroj: | Journal of Molecular Catalysis A: Chemical. 199:39-47 |
| ISSN: | 1381-1169 |
| DOI: | 10.1016/s1381-1169(03)00016-5 |
| Popis: | Electrochemical reduction of carbon dioxide was studied with various series of copper single crystal electrodes in 0.1 M KHCO3 aqueous solution at constant current density 5 mA cm−2; the electrodes employed are Cu(S)-[n (1 0 0)×(1 1 1) ], Cu(S)-[n (1 0 0)×(1 1 0) ], Cu(S)-[n (1 1 1)×(1 0 0) ], Cu(S)-[n (1 1 1)×(1 1 1) ] and Cu(S)-[n (1 1 0)×(1 0 0) ]. The electrodes based on (1 0 0) terrace surface give ethylene as the major product. The ethylene formation is further promoted by the introduction of (1 1 1) or (1 1 0) steps to the (1 0 0) basal plane. The highest C2H4 to CH4 formation ratio amounts to 10 in terms of the current efficiency for the (7 1 1) (=4(1 0 0) − (1 1 1)) surface as compared with the value 0.2 for the (1 1 1) electrode. The n(1 1 1)−(1 1 1) surfaces favor the formations of acetic acid, acetaldehyde and ethyl alcohol with the increase of the (1 1 1) step atom density. CH4 formation at the n(1 1 1)−(1 1 1) electrodes decreases with the increase of the (1 1 1) step atom density. The n(1 1 1)−(1 0 0) surfaces give higher gaseous products; the major product is CH4 with lower fraction of C2+ compounds. |
| Databáze: | OpenAIRE |
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