Permeability Matters When Reducing CO2 in an Electrochemical Flow Cell,ACS Energy Letters

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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 KHCO_3(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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