Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.025
Publication date: 23rd September 2021
The electrochemical reduction of carbon dioxide requires access to ample CO2 gas and liquid water to fuel reactions at a high rate for industrially relevant applications. The application of gas-diffusion electrodes has notably improved the current densities by over an order of magnitude by positioning the catalyst at gas/liquid interfaces. Such configuration also adds complexity to the electrode that no longer consists of the only catalyst but also a multi-scale network of the gas-liquid-solid interfaces. Therefore, electrode wettability serves a vital role in determining the electrochemical surface area and gas pathways in the three-dimensional electrode structure and thus has a profound impact on the electrode activity, product selectivity, and long-term stability. Based on the content of our recent review paper[1], this presentation will provide an overview of the possible mechanisms underlying the phenomena such as electrowetting and salt precipitation commonly observed in the field of CO2 electrochemical reduction and discuss the inevitable critical issues in balancing electrochemical surface area and gas pathways. At last, the presentation will conclude with some recent attempts and future outlooks to address these critical issues and redesign the next generation of gas-diffusion electrodes.
We acknowledge funding towards our research activities related to this review received from the UQ Foundation Research Excellence Award, and the Australian Research Council (LP160101729, FL170100101). Y. Wu and M. N. Idros acknowledge scholarship support from the University of Queensland (UQ) Graduate School. T. Burdyny acknowledges NWO for an individual Veni grant.
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