Strategies for CO2 electroreduction in cation exchange membrane electrode assembly

被引：46

作者：

Park, Jaeyong ^{[1
]}

Ko, Young-jin ^{[1
]}

Lim, Chulwan ^{[1
,2
]}

Kim, Hyunchul ^{[1
,3
]}

Min, Byoung Koun ^{[1
,4
]}

Lee, Kwan-Young ^{[2
,4
]}

Koh, Jai Hyun ^{[1
,5
]}

Oh, Hyung-Suk ^{[1
,6
,7
]}

Lee, Woong Hee ^{[1
]}

机构：

[1] Korea Inst Sci & Technol KIST, Clean Energy Res Ctr, Hwarang Ro,14 Gil 5, Seoul 02792, South Korea

[2] Korea Univ, Dept Chem & Biol Engn, 145 Anam Ro, Seoul 02841, South Korea

[3] Korea Univ, Dept Mat Sci & Engn, Anamdong 5 Ga, Seoul 02841, South Korea

[4] Korea Univ, Grad Sch Energy & Environm, Green Sch, 145 Anam Ro, Seoul 02841, South Korea

[5] Korea Univ Sci UST & Technol, KIST Sch, Div Energy & Environm Technol, Seoul 02792, South Korea

[6] Sungkyunkwan Univ, KIST SKKU Carbon Neutral Res Ctr, 2066 Seobu Ro, Suwon 16419, South Korea

[7] Sungkyunkwan Univ SKKU, Sch Adv Mat Sci & Engn, Suwon 16419, South Korea

来源：

CHEMICAL ENGINEERING JOURNAL | 2023年 / 453卷

基金：

新加坡国家研究基金会;

关键词：

CO 2 reduction reaction (CO 2 RR); Cation Exchange Membrane (CEM); Carbon monoxide; Cross over; Cation effect; CARBON-DIOXIDE REDUCTION; ELECTROCHEMICAL REDUCTION; INSIGHTS; PRODUCTS; DESIGN; SYNGAS;

D O I：

10.1016/j.cej.2022.139826

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

For a CO2 reduction reaction (CO2RR), cation-exchange membrane (CEM)-based membrane electrode assembly (MEA) electrolyzers are among the most commercially viable systems; however, the acidic environment in these electrolyzers lowers the CO2RR selectivity. Herein, we outline broad methods for enhancing the performance of CEM MEA electrolyzers by providing an alkaline environment for the cathode. An appropriate amount of anion exchange ionomer, high-alkali cation concentration, and thick catalyst layer with carbon increase the pH gradient for neutralization and minimize the neutralization boundary layer, thus turning most of the catalyst layer into an alkaline environment with high CO2RR selectivity. To take advantage of cation effects, local cation concentrations must be controlled to avoid losing energy efficiency due to high membrane resistance of large cations. Furthermore, the operating conditions of the MEA electrolyzer influence cation concentration. Our study provides various insights into facilitating the development of CEM CO2 MEA electrolyzers for practical application.

引用

页数：8

共 49 条

[41] Techno-economic assessment of low-temperature carbon dioxide electrolysis [J].