Design principles for selective and economical CO2 electrolysis in acids

被引：23

作者：

Kim, Jaehoon ^{[1
]}

Ha, Tae Hyeon ^{[1
]}

Kim, Junehyeok ^{[2
]}

Jeong, Gyoung Hwa ^{[1
,3
]}

Kim, Sang Ouk ^{[1
,3
]}

Chung, Wonsuk ^{[2
]}

Roh, Kosan ^{[4
]}

Lee, Jay H. ^{[2
,5
]}

Oh, Jihun ^{[1
]}

机构：

[1] Korea Adv Inst Sci & Technol KAIST, Dept Mat Sci & Engn, 291 Daehak Ro, Daejeon 34141, South Korea

[2] Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, 291 Daehak Ro, Daejeon 34141, South Korea

[3] Korea Adv Inst Sci & Technol, Natl Creat Res Initiat CRI, Ctr Multidimens Directed Nanoscale, 291 Daehak Ro, Daejeon 34141, South Korea

[4] Chungnam Natl Univ, Dept Chem Engn & Appl Chem, 99 Daehak Ro, Daejeon 34134, South Korea

[5] Univ Southern Calif, Mork Family Dept Chem Engn & Mat Sci, 3651 Watt Way, Los Angeles, CA 90089 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2023年 / 339卷

基金：

新加坡国家研究基金会;

关键词：

Electrochemical CO 2 reduction; Flow cell; Acid electrolyte; Ni single-atom catalyst; Techno-economic and Life cycle assessment; SINGLE-PASS CONVERSION; TECHNOECONOMIC ANALYSIS; HYDROGEN EVOLUTION; ELECTROREDUCTION; REDUCTION; ALKALINITY; PROMOTION; CATALYST; SYNGAS;

D O I：

10.1016/j.apcatb.2023.123160

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The electrochemical CO2 reduction reaction (CO2RR) is a promising pathway for converting CO2 into valuable products such as carbon monoxide (CO). Here we show that a remarkably high CO selectivity can be achieved in a gas diffusion electrode-based CO2RR flow cell by using different characteristics of the proton and CO2 reduction reactions over a wide range of pHs, while H2 evolution from H2O reduction can be effectively avoided. The potential window of a high-performance Ni single-atom catalyst for CO2RR does not overlap with that for H2O reduction; this allows CO selectivity to exceed 90% in a pH 2 electrolyte, thereby attaining a CO2-to-CO conversion rate of approximately 77%. Effects of electrolyte compositions on CO2RR are also evaluated. Technoeconomic and life cycle assessments establish that CO2RR is more favorable in acidic conditions, which can minimize the additional CO2 recycling and electrolyte regeneration processes, if surplus or cheap renewable electricity is available.

引用

页数：12

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