Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.139
Publication date: 18th July 2019
The electrochemical conversion of CO2 (CO2RR) to valuable carbon-based products at an industrial equivalent scale is posed to validate the potential economic and technical feasibility of the technology. In this talk, we present a catalytic active, free-standing 2-dimensional (2D) copper oxide, exposing predominantly {001} facets, and its CO2RR performance in both liquid H-cell configuration and industry-relevant micro flow cell. The CuOx nanoparticles exhibit ordinary stability towards ethylene over 40 hours in H-cell. operando grazing incidence wide angle x-ray scattering (WAXS) is used to reveal the changes in structure the catalyst that undergoes at different reaction stages. The onset potentials of the main products are also determined by a novel operandoDifferential Electrochemical Mass Spectrometry (DEMS) capillary flow cell with milli-second time-resolution. The defect-rich surface introduced by the self-reducing process is proposed to be responsible for the catalytically stable performance for C2H4 formation. We thus employ such thin layer CuOx nanoparticles as a catalyst candidate for a type of Gas Diffusion Electrode (GDE) combined Micro-Flow-Cell (MFC) measurement. It shows an outstanding ethylene production under industry equivalent neutral condition, demonstrating C2+ products partial current density reaches ~ 410 mA cm-2. The present study corroborates the power of in situ techniques and discovers structure-activity-selectivity relations under catalytic CO2RR operating conditions, delivering perspectives to design novel catalysts to produce hydrocarbons as the value-added products.
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