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.
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页数:12
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