Cu nanowire-catalyzed electrochemical reduction of CO or CO2
| Autor: | Stephen Ahn, Hongyi Zhang, Shouheng Sun, Yuyang Li, Yin-Jia Zhang, G. Tayhas R. Palmore, Jiaju Fu, Andrew A. Peterson |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Inorganic chemistry Nanowire 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst Electrochemistry 01 natural sciences 0104 chemical sciences Catalysis Reversible hydrogen electrode General Materials Science Selective reduction 0210 nano-technology Selectivity Faraday efficiency |
| Zdroj: | Nanoscale. 11:12075-12079 |
| ISSN: | 2040-3372 2040-3364 |
| DOI: | 10.1039/c9nr03170g |
| Popis: | We prepared micrometer long Cu nanowires (NWs) of 25 and 50 nm diameters and studied their electrocatalysis for electrochemical reduction of CO/CO2 in 0.1 M KHCO3 at room temperature. The 50 nm NWs showed better selectivity than the 25 nm NWs, and catalyzed CO reduction to C2-hydrocarbons (C2H4 + C2H6) with a combined faradaic efficiency (FE) of 60% (C2H4 FE of 35% and mass activity of 4.25 A g-1 Cu) at -1.1 V (vs. reversible hydrogen electrode). The NW-catalyzed CO2 reduction is less efficient due to the extra CO2 to CO step required for the formation of C2-hydrocarbons. This experimental evidence combined with DFT calculations suggests that CO is an important intermediate and NWs provide a large Cu(100) surface for *CO hydrogenation (to *CHO) and *CO-*CHO coupling, leading to more selective reduction of CO than CO2 towards C2-hydrocarbons. |
| Databáze: | OpenAIRE |
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