B‐Cu‐Zn Gas Diffusion Electrodes for CO 2 Electroreduction to C 2+ Products at High Current Densities
| Autor: | Corina Andronescu, Nivedita Sikdar, Denis Öhl, João R. C. Junqueira, Sabine Seisel, Yanfang Song, Wolfgang Schuhmann, Thomas Quast, Stefan Dieckhöfer, Justus Masa |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Gas diffusion electrode 010405 organic chemistry Inorganic chemistry General Chemistry Overpotential 010402 general chemistry 01 natural sciences 7. Clean energy Catalysis 0104 chemical sciences symbols.namesake Electrode symbols Gaseous diffusion Raman spectroscopy Selectivity Current density Faraday efficiency |
| Zdroj: | Angewandte Chemie International Edition |
| ISSN: | 1521-3773 1433-7851 |
| Popis: | Electroreduction of CO2 to multi-carbon products has attracted considerable attention as it provides an avenue to high-density renewable energy storage. However, the selectivity and stability under high current densities are rarely reported. Herein, B-doped Cu (B-Cu) and B-Cu-Zn gas diffusion electrodes (GDE) were developed for highly selective and stable CO2 conversion to C2+ products at industrially relevant current densities. The B-Cu GDE exhibited a high Faradaic efficiency of 79 % for C2+ products formation at a current density of -200 mA cm-2 and a potential of -0.45 V vs. RHE. The long-term stability for C2+ formation was substantially improved by incorporating an optimal amount of Zn. Operando Raman spectra confirm the retained Cu+ species under CO2 reduction conditions and the lower overpotential for *OCO formation upon incorporation of Zn, which lead to the excellent conversion of CO2 to C2+ products on B-Cu-Zn GDEs. |
| Databáze: | OpenAIRE |
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