Electrochemical reduction of CO2 to CO on hydrophobic Zn foam rod in a microchannel electrochemical reactor

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Abstract

Due to CO2 mass transfer limitation as well as the competition of hydrogen evolution reaction in electroreduction of CO2 in the aqueous electrolyte, Zn-based electrodes normally exhibit unsatisfying selectivity for CO production, especially at high potentials. In this work, we introduced a zinc myristate (Zn [CH3 (CH2)12COO]2) hydrophobic layer on the surface of zinc foam electrode by an electrodeposition method. The obtained hydrophobic zinc foam electrode showed a high Faraday efficiency (FE) of 91.8% for CO at −1.9 V (vs. saturated calomel electrode, SCE), which was a remarkable improvement over zinc foam (FECO = 81.87%) at the same potentials. The high rough-ness of the hydrophobic layer has greatly increased the active surface area and CO2 mass transfer performance by providing abundant gas-liquid-solid contacting area. This work shows adding a hydrophobic layer on the surface of the catalyst is an effective way to improve the electrochemical CO2 reduction performance.

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Zhang, C., Yan, S., Lin, J., Hu, Q., Zhong, J., Zhang, B., & Cheng, Z. (2021). Electrochemical reduction of CO2 to CO on hydrophobic Zn foam rod in a microchannel electrochemical reactor. Processes, 9(9). https://doi.org/10.3390/pr9091592

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