Published September 23, 2021 | Version v1
Journal article Open

A Metal–Organic Framework derived CuxOyCz Catalyst for Electrochemical CO2 Reduction and Impact of Local pH Change

Authors/Creators

  • 1. Analytical Chemistry—Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr University Bochum Universitätsstr. 150, 44780 Bochum (Germany)
  • 2. Chemical Technology III; Faculty of Chemistry and CENIDE Center for Nanointegration, University Duisburg-Essen Carl-Benz Straße 199, 47057 Duisburg (Germany)
  • 3. CAS Key Laboratory of Low-Carbon Conversion Science and Engi- neering, Shanghai Advanced Research Institute, Chinese Academy of Sciences 99 Haike Road, Shanghai 201203 (People's Republic of China)

Description

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 CuxOyCz nanostructured electrocatalysts derived from a Cu-based MOF as porous self-sacrificial template. Blending catalysts with polytetrafluoroethylene (PTFE) on gasdiffusion 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 mAcm-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-/H2O activity ratio due to the locally generated OH@ ions at increasing current densities was determined irrespective of the PTFE amount.

Notes

This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (CasCat [833408]) as well as from the Deutsche Forschungsgemeinschaft (DFG) in the framework of the research unit FOR 2397e2 (276655237) and under GermanyQs Excellence Strategy-EXC 2033-390677874-RESOLV. C.A. acknowledges funding by the BMBF in the framework of the NanomatFutur project "MatGasDif" (03XP0263). N.S. acknowledges the Alexander von Humboldt foundation for a Postdoc fellowship. R. Wanka is acknowledged for contact angle measurements, Dr. Ulrich Hagemann from the Interdisciplinary Center for Analytics on the Nanoscale (ICAN), a core facility funded by the DFG (RI 00313) for a part of the XPS measurements and Dr. S. Cychy for adsorption measurements. Open Access funding enabled and organized by Projekt DEAL.

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DOI10.1002anie.202108313.pdf

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Funding

European Commission
CASCAT - Catalytic cascade reactions. From fundamentals of nanozymes to applications based on gas-diffusion electrodes 833408