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Permeability Matters When Reducing CO2 in an Electrochemical Flow Cell
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-06-24 , DOI: 10.1021/acsenergylett.2c01160
Yongwook Kim 1 , Eric W. Lees 2 , Curtis P. Berlinguette 1, 2, 3, 4
Affiliation  

The highest performing cathodes for CO2 electrolyzers are porous and exhibit high specific surface areas that serve to increase the density of CO2 reduction catalyst sites. While porous electrodes increase CO2 reduction activity, their high surface area can negatively impact the mass transport of products and reactants at high current densities (i.e., >100 mA cm–2). We demonstrate here the trade-off between the density of CO2 reduction catalyst sites (specific surface area) and mass transport (permeability) for porous electrodes used for mediating the conversion of KHCO3(aq) into CO(g) in an electrolyzer. This demonstration relied on porous electrodes containing a silver electrocatalyst deposited on carbon fibers of varying fiber diameters (0.5, 1, and 10 μm). Porous electrodes with the intermediate specific surface areas (fiber diameter = 1 μm) yielded the highest CO formation rates. This result shows that permeability should be considered when designing porous electrodes for CO2 electrolysis.

中文翻译:

减少电化学流通池中的二氧化碳时,渗透性很重要

用于 CO 2电解槽的最高性能阴极是多孔的,并具有高比表面积,可用于增加 CO 2还原催化剂位点的密度。虽然多孔电极提高了 CO 2还原活性,但它们的高表面积会对高电流密度(即 >100 mA cm -2)下产物和反应物的质量传输产生负面影响。我们在此展示了用于介导 KHCO 3 (aq)转化为 CO (g)的多孔电极的 CO 2还原催化剂位点密度(比表面积)和质量传输(渗透性)之间的权衡在电解槽中。该演示依赖于多孔电极,该电极含有沉积在不同纤维直径(0.5、1 和 10 μm)的碳纤维上的银电催化剂。具有中等比表面积(纤维直径 = 1 μm)的多孔电极产生最高的 CO 形成率。该结果表明,在设计用于 CO 2电解的多孔电极时应考虑渗透性。
更新日期:2022-06-24
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