Effects of composition of the micro porous layer and the substrate on performance in the electrochemical reduction of CO2 to CO

JOURNAL OF POWER SOURCES

卷:312

Article

Kim, Byoungsu¹  Hillman, Febrian¹  Ariyoshi, Miho²  Fujikawa, Shigenori^2,3  Kenis, Paul J. A.^1,2 

[1] Univ Illinois, Dept Chem & Biomol Engn, 600 South Mathews Ave, Urbana, IL 61801 USA

[2] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Fukuoka 812, Japan

[3] Kyushu Univ, CMS, Fukuoka 812, Japan

关键词: Carbon dioxide;    Electrochemical reduction;    Gas diffusion electrode;    Microporous layer;    Carbon fiber substrate;    Optimization;   

DOI  :  10.1016/j.jpowsour.2016.02.043

来源: Elsevier

【 摘 要 】

With the development of better catalysts, mass transport limitations are becoming a challenge to high throughput electrochemical reduction of CO2 to CO. In contrast to optimization of electrodes for fuel cells, optimization of gas diffusion electrodes (GDE) - consisting of a carbon fiber substrate (CFS), a micro porous layer (MPL), and a catalyst layer (CL) - for CO2 reduction has not received a lot of attention. Here, we studied the effect of the MPL and CFS composition on cathode performance in electroreduction of CO2 to CO. In a flow reactor, optimized GDEs exhibited a higher partial current density for CO production than Sigracet 35BC, a commercially available GDE. By performing electrochemical impedance spectroscopy in a CO2 flow reactor we determined that a loading of 20 wt% PTFE in the MPL resulted in the best performance. We also investigated the influence of the thickness and wet proof level of CFS with two different feeds, 100% CO2 and the mixture of 50% CO2 and N-2, determining that thinner and lower wet proofing of the CFS yields better cathode performance than when using a thicker and higher wet proof level of CFS. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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