The role of ionomers in the electrolyte management of zero-gap MEA-based CO2 electrolysers: A Fumion vs. Nafion comparison

被引：14

作者：

Liu, Menglong ^{[1
]}

Hu, Huifang ^{[1
]}

Kong, Ying ^{[1
]}

Montiel, Ivan Zelocualtecatl ^{[1
]}

Kolivoska, Viliam ^{[2
]}

V. Rudnev, Alexander ^{[1
,3
]}

Hou, Yuhui ^{[1
]}

Erni, Rolf ^{[4
]}

Vesztergom, Soma ^{[1
,5
]}

Broekmann, Peter ^{[1
]}

机构：

[1] Univ Bern, Dept Chem Biochem & Pharmaceut Sci, NCCR Catalysis, Freiestr 3, CH-3012 Bern, Switzerland

[2] Czech Acad Sci, J Heyrovsky Inst Phys Chem, Dolejskova 3, Prague 18223, Czech Republic

[3] Russian Acad Sci, AN Frumkin Inst Phys Chem & Electrochem, Leninsky Prospekt 31, Moscow 119071, Russia

[4] Swiss Fed Labs Mat Sci & Technol EMPA, Electron Microscopy Ctr, Uberlandstr 129, CH-8600 Dubendorf, Switzerland

[5] Eotvos Lorand Univ, MTA ELTE Momentum Interfacial Electrochem Res Grp, Pazmany Peter Setany 1-A, H-1117 Budapest, Hungary

来源：

APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2023年 / 335卷

基金：

瑞士国家科学基金会;

关键词：

Power to value; Carbon dioxide electroreduction; Stability; Precipitation; GDE flooding; CARBON-DIOXIDE; ELECTROCHEMICAL CO2; DIFFUSION ELECTRODES; REDUCTION; ELECTROREDUCTION; OPERATION;

D O I：

10.1016/j.apcatb.2023.122885

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：

We study the role of binders (ionomers) in determining the life-span of gas diffusion electrodes (GDEs) used for high throughput CO2-to-CO electrolysis. We compare two typical ionomer materials (Nafion and Fumion, both are widely used for the preparation of Ag nanoparticles-based catalyst inks) to show that when used in zero-gap membrane/electrode assemblies, Fumion-containing inks are superior to Nafion-based ones and can uphold a very high CO-selectivity in the electrochemical CO2 reduction reaction for longer time. This is due to the ability of Fumion containing inks to suppress precipitation inside the GDE structure. As Fumion-fixed GDEs are significantly less hydrophobic than Nafion-fixed ones, our results contradict the widely accepted opinion that it is their non-wettability what mostly protects CO2-reducing GDEs from flooding. In turn, we argue that it is more important to maintain efficient electrolyte drainage pathways in the GDE structure, and explain the superiority of Fumion-fixed GDEs on this basis.

引用

页数：12