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

Sikdar, N. and Junqueira, J.R.C. and Dieckhöfer, S. and Quast, T. and Braun, M. and Song, Y. and Aiyappa, H.B. and Seisel, S. and Weidner, J. and Öhl, D. and Andronescu, C. and Schuhmann, W.

Volume: 60 Pages: 23427-23434
DOI: 10.1002/anie.202108313
Published: 2021

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 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−/H2O activity ratio due to the locally generated OH− ions at increasing current densities was determined irrespective of the PTFE amount. © 2021 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH

« back