화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.82, 374-382, February, 2020
DOI10.1016/j.jiec.2019.11.001  Export Citation
Ag-deposited Ti gas diffusion electrode in proton exchange membrane CO2 electrolyzer for CO production
Seonhwa Oh1, Young Sang Park1, 2, Hyanjoo Park1, Hoyoung Kim1, Jong Hyun Jang2, 3, †, Insoo Choi4, †, and Soo-Kil Kim1, †
  • 1School of Integrative Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
  • 2Center for Hydrogen Fuel Cell Research, Korea Institute of Science and Technology (KIST), 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
  • 3Division of Energy & Environment Technology, KIST school, University of Science and Technology, Seoul 02792, Republic of Korea
  • 4Division of Energy Engineering, Kangwon National University, 346 Jungang-ro, Samcheok 25913, Republic of Korea
E-mail:, ,
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.
Keywords:Carbon dioxide;Electrochemical reduction;Silver;Titanium;Gas diffusion electrode;Membrane electrolyzer
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