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Open AccessReview

Towards Higher Rate Electrochemical CO2 Conversion: From Liquid-Phase to Gas-Phase Systems

by 1,†, 2,†, 2 and 1,2,3,*
1
Graduate School of Energy, Environment, Water, and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
2
Department of Materials Science and Engineering, KAIST, Daejeon 34141, Korea
3
KAIST Institute for NanoCentury (KINC), KAIST, Daejeon 34141, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Catalysts 2019, 9(3), 224; https://doi.org/10.3390/catal9030224
Received: 26 January 2019 / Revised: 18 February 2019 / Accepted: 19 February 2019 / Published: 1 March 2019
(This article belongs to the Special Issue Catalysis and Catalytic Processes for CO2 Conversion)
Electrochemical CO2 conversion offers a promising route for value-added products such as formate, carbon monoxide, and hydrocarbons. As a result of the highly required overpotential for CO2 reduction, researchers have extensively studied the development of catalyst materials in a typical H-type cell, utilizing a dissolved CO2 reactant in the liquid phase. However, the low CO2 solubility in an aqueous solution has critically limited productivity, thereby hindering its practical application. In efforts to realize commercially available CO2 conversion, gas-phase reactor systems have recently attracted considerable attention. Although the achieved performance to date reflects a high feasibility, further development is still required in order for a well-established technology. Accordingly, this review aims to promote the further study of gas-phase systems for CO2 reduction, by generally examining some previous approaches from liquid-phase to gas-phase systems. Finally, we outline major challenges, with significant lessons for practical CO2 conversion systems. View Full-Text
Keywords: CO2 reduction; catalysts; liquid-phase reactor; H-type cell; gas-phase reactor; membrane electrode assembly (MEA) cell; microfluidic cell; gas diffusion electrode (GDE); review CO2 reduction; catalysts; liquid-phase reactor; H-type cell; gas-phase reactor; membrane electrode assembly (MEA) cell; microfluidic cell; gas diffusion electrode (GDE); review
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Song, J.T.; Song, H.; Kim, B.; Oh, J. Towards Higher Rate Electrochemical CO2 Conversion: From Liquid-Phase to Gas-Phase Systems. Catalysts 2019, 9, 224.

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