A Metal–Organic Framework derived Cu x O y C z Catalyst for Electrochemical CO 2 Reduction and Impact of Local pH Change
| Autor: | Corina Andronescu, Michael Braun, Thomas Quast, Yanfang Song, Stefan Dieckhöfer, Harshitha Barike Aiyappa, João R. C. Junqueira, Jonas Weidner, Denis Öhl, Nivedita Sikdar, Sabine Seisel, Wolfgang Schuhmann |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Gas diffusion electrode 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Electrocatalyst 01 natural sciences Redox Catalysis 0104 chemical sciences Chemical engineering Gaseous diffusion Metal-organic framework 0210 nano-technology Faraday efficiency |
| Zdroj: | Angewandte Chemie International Edition. 60:23427-23434 |
| ISSN: | 1521-3773 1433-7851 |
| Popis: | Developing highly efficient and selective electrocatalysts for the CO2 reduction reaction to produce value-added chemicals has been intensively pursued. We report a series of Cux Oy Cz nanostructured electrocatalysts derived from a Cu-based MOF as porous self-sacrificial template. Blending catalysts with polytetrafluoroethylene (PTFE) on gas diffusion electrodes (GDEs) suppressed the competitive hydrogen evolution reaction. 25 to 50 wt % teflonized GDEs exhibited a Faradaic efficiency of ≈54 % for C2+ products at -80 mA cm-2 . The local OH- ions activity of PTFE-modified GDEs was assessed by means of closely positioning a Pt-nanoelectrode. A substantial increase in the OH- /H2 O activity ratio due to the locally generated OH- ions at increasing current densities was determined irrespective of the PTFE amount. |
| Databáze: | OpenAIRE |
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