Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.178
Publication date: 23rd September 2021
CO2 conversion to valuable products has been recently highlighted and made significant progress in terms of current density as well as product selectivity. For instance, CO or formate can be achieved more than 95 % of Faradaic efficiency from electrochemical CO2 reduction reaction (CO2RR). The next technical challenges in the catalyst development is achieving long-term stability for the practical application. During electrochemical CO2 reduction reaction, various factors can affect the stability of the catalyst, and metal impurities (ions) in the electrolyte can be especially detrimental for CO2RR because the transition metal impurities can be depostied on the catalyst surface and activate hydrogen evolution reaction (HER). In this talk, I will compare Ag nanoparticle electrocatalyst with N-doped carbon based electrocatalyst for the electrochemical CO2 reduction reaction to CO production. We found that N-doped carbon catalysts have high resistance to the impurity metal attack in the electrolyte, and long-term durability was achieved1-2. In addition, for the practical point of view, low concentration of CO2 gas feed has to be considered as well because the flue gas contains diluted CO2 concentration not pure CO2. As decreasing the concentration of CO2 feed, CO2RR selectivity over hydrogen evolution reaction (HER) can be senstively affected. We also find that at low concentration of CO2, Ag nanoparticle showed decreased CO Faradaic efficiency due to increased HER, and modifying the operational condition in the gas-diffusion electrode (GDE) based membrane electrode assembly (MEA) electrolyzer can affect the water supply to the catalyst layer and thus contribution to suppressing HER. We propose that the CO selectivity can be adjustable both of intrinsic catalyst activity as well as extrinsic properties in MEA at low CO2 concentration condition.
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