Electrocatalytic Reduction of Low Concentrations of CO2 Gas in a Membrane Electrode Assembly Electrolyzer
- 주제(기타) Chemistry, Physical; Electrochemistry; Energy & Fuels; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
- 설명문(일반) [Kim, Dongjin; Choi, Woong; Lee, Hee Won; Choi, Yongjun; Lee, Dong Ki; Lee, Ung; Won, Da Hye] Korea Inst Sci & Technol, Clean Energy Res Ctr, Seoul 02792, South Korea; [Kim, Dongjin; Kim, Woong] Korea Univ, Dept Mat Sci & Engn, Seoul 02841, South Korea; [Lee, Hee Won; Choi, Yongjun; Lee, Dong Ki; Lee, Ung; Won, Da Hye] Korea Univ Sci & Technol UST, KIST Sch, Div Energy & Environm Technol, Seoul 02792, South Korea; [Lee, Si Young; Hwang, Yun Jeong] Seoul Natl Univ, Dept Chem, Seoul 08826, South Korea; [Lee, Si Young; Hwang, Yun Jeong] Inst Basic Sci IBS, Ctr Nanoparticle Res, Seoul 08826, South Korea; [Lee, Dong Ki; Lee, Ung] Korea Univ, Grad Sch Energy & Environm, Green Sch, Seoul 02841, South Korea; [Na, Jonggeol] Ewha Womans Univ, Dept Chem Engn & Mat Sci, Grad Program Syst Hlth Sci & Engn, Seoul 03760, South Korea
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- 발행기관 AMER CHEMICAL SOC
- 발행년도 2021
- URI http://www.dcollection.net/handler/ewha/000000183704
- 본문언어 영어
- Published As http://dx.doi.org/10.1021/acsenergylett.1c01797
초록/요약
The direct conversion of low concentrations of CO2 is an essential approach, considering the expensive gas conditioning process for pure CO2, but has not yet been intensely studied in a membrane electrode assembly (MEA) electrolyzer. Herein, we explored the CO2 reduction with various CO2 concentrations in a zero-gap MEA electrolyzer and found that suppressing the hydrogen evolution reaction (HER) became more critical at low concentrations of CO2. We demonstrate that a Ni single-atom (Ni-N/C) catalyst exhibits a high tolerance toward low CO2 partial pressure (P-CO2) because of the intrinsically large activation energy of the HER. Ni-N/C outperformed the CO productivity of Ag nanoparticles, especially at low concentrations of CO2 in the zero-gap MEA. When the P-CO2 was lowered from 1.0 to 0.1 atm, Ni-N/C maintained >93% of CO Faradaic efficiency (FECO), but Ag nanoparticles showed a decrease in FECO from 94% to 40%. Furthermore, on the basis of a computational fluid dynamics simulation, we developed extrinsic operating conditions controlling the water transfer from the anolyte to the catalyst layer and improved CO selectivity at low CO2 concentrations in the MEA electrolyzer.
more