B-Cu-Zn Gas Diffusion Electrodes for CO2 Electroreduction to C2+ Products at High Current Densities

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.

Citation

Song, Y., Junqueira, J. R., Sikdar, N., Öhl, D., Dieckhöfer, S., Quast, T., ... & Schuhmann, W. (2021). B‐Cu‐Zn gas diffusion electrodes for CO2 electroreduction to C2+ products at high current densities. Angewandte Chemie International Edition, 60(16), 9135-9141.https://doi.org/10.1002/anie.202016898

URI

https://nru.uncst.go.ug/handle/123456789/5264

Collections

Engineering and Technology

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