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

Byoungsu Kim, Febrian Hillman, Miho Ariyoshi, Shigenori Fujikawa, Paul J.A. Kenis

    Research output: Contribution to journalArticlepeer-review

    65 Citations (Scopus)

    Abstract

    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 N2, 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.

    Original languageEnglish
    Pages (from-to)192-198
    Number of pages7
    JournalJournal of Power Sources
    Volume312
    DOIs
    Publication statusPublished - Apr 30 2016

    All Science Journal Classification (ASJC) codes

    • Renewable Energy, Sustainability and the Environment
    • Energy Engineering and Power Technology
    • Physical and Theoretical Chemistry
    • Electrical and Electronic Engineering

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