Ag-deposited Ti gas diffusion electrode in proton exchange membrane CO2 electrolyzer for CO production
- Authors
- Oh S.; Park Y.S.; Park H.; Kim H.; Jang J.H.; Choi I.; Kim, Soo-Kil
- Issue Date
- 25-Feb-2020
- Publisher
- Korean Society of Industrial Engineering Chemistry
- Keywords
- Carbon dioxide; Electrochemical reduction; Gas diffusion electrode; Membrane electrolyzer; Silver; Titanium
- Citation
- Journal of Industrial and Engineering Chemistry, v.82, pp 374 - 382
- Pages
- 9
- Journal Title
- Journal of Industrial and Engineering Chemistry
- Volume
- 82
- Start Page
- 374
- End Page
- 382
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/37557
- DOI
- 10.1016/j.jiec.2019.11.001
- ISSN
- 1226-086X
1876-794X
- Abstract
- Electrochemical CO2-to-CO conversion is techno-economically effective for utilizing CO2. Although numerous studies are available on CO2 conversion catalysts, many of them are limited to a half-cell or conventional H-type apparatus in aqueous mediums, providing insufficient CO2 feeding. In this study, as a part of pioneering works on gas-feeding reactors, a gas diffusion electrode consisting of a Ti substrate with affixed Ag electrocatalysts was suggested; this enables the mass conversion of CO2 via direct feeding of CO2. Herein, Ag catalysts were electrodeposited on a Ti gas diffusion layer for a proton exchange membrane-based CO2 electrolyzer. Pre-treatment of the Ti crucially influenced the deposition profile, adhesiveness, morphology, and electrochemical surface area of the Ag deposit, which influence the CO2/CO conversion efficiency of the catalyst. Pre-treatment with HCl-H2SO4 conferred the highest roughness and hydrophilicity to the Ti substrate, leading to the highest surface area of the Ag catalyst and a consequent substantial increase in the CO2/CO conversion efficiency (45% at Vcell = −2.2 V), which is a 5.7-fold increase when compared with the un-treated counterpart. The fabrication of Ag/Ti gas diffusion electrode via simple Ag electrodeposition and optimized Ti pre-treatments reported herein provides a guide for manufacturing proton exchange membrane-based CO2 electrolyzers. © 2019 The Korean Society of Industrial and Engineering Chemistry
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