Microenvironments of Cu catalysts in zero-gap membrane electrode assembly for efficient CO2 electrolysis to C2+ products
- 주제(기타) Chemistry, Physical
- 주제(기타) Energy & Fuels
- 주제(기타) Materials Science, Multidisciplinary
- 설명문(일반) [Choi, Woong; Choi, Yongjun; Jung, Wonsang; Lee, Woong Hee; Oh, Hyung-Suk; Won, Da Hye] Korea Inst Sci & Technol, Clean Energy Res Ctr, 5 Hwarang Ro 14 gil, Seoul 02792, South Korea; [Choi, Yongjun; Jung, Wonsang; Oh, Hyung-Suk; Won, Da Hye] Korea Univ Sci & Technol UST, KIST Sch, Div Energy & Environm Technol, Seoul 02792, South Korea; [Yun, Hyewon; Lee, Woong Hee; Hwang, Yun Jeong] Seoul Natl Univ, Coll Nat Sci, Dept Chem, Seoul 08826, South Korea; [Oh, Hyung-Suk] Kyung Hee Univ, KHU KIST Dept Conversing Sci & Technol, Seoul 02447, South Korea; [Choi, Eunsuh; Na, Jonggeol] Ewha Womans Univ, Grad Program Syst Hlth Sci & Engn, Dept Chem Engn & Mat Sci, Seoul 03760, South Korea; [Hwang, Yun Jeong] Inst Basic Sci IBS, Ctr Nanoparticle Res, Seoul 08826, South Korea
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- 발행기관 ROYAL SOC CHEMISTRY
- 발행년도 2022
- URI http://www.dcollection.net/handler/ewha/000000191111
- 본문언어 영어
- Published As https://doi.org/10.1039/d1ta10939a
초록/요약
A zero-gap membrane-electrode assembly (MEA) electrolyzer is a promising design for electrochemical CO2 reduction reactions (eCO(2)RRs), where gaseous CO2 is directly fed without catholyte. The zero-gap junction between the catalyst and the membrane can have distinct chemical environments and mass transfer properties from the conventional H-type cell but is rarely studied. In this work, we designed an integrated experimental-simulation study in MEA to understand the zero-gap junction and factors to determine the eCO(2)RR activity to multi-carbon production. We developed a simple synchronous ionomer/catalyst activation step under alkaline conditions to form jagged CuO nanoparticles whose unique morphological evolution facilitates the C2+ chemical production for the zero-gap MEA electrolyzer. Moreover, under gas-fed and high-current density conditions, computational fluid dynamics suggests that the mass transfer limitation of water as a proton source across the catalyst-membrane layer and cathode kinetic overpotential are critical to determining C2+ chemical production in the range of several micrometers. From the chemical-physical understanding, we achieved a high partial current density of 336.5 mA cm(-2) and a faradaic efficiency of 67.3% towards C2+ chemicals.
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