电解
电解质
微型多孔材料
气体扩散
电化学
法拉第效率
气体扩散电极
电催化剂
电极
化学工程
材料科学
电解水
聚四氟乙烯
化学
复合材料
工程类
物理化学
作者
Yuming Wu,Liam Charlesworth,Irving Maglaya,Mohamed Nazmi Idros,Mengran Li,Thomas Burdyny,Geoff Wang,Thomas E. Rufford
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2022-08-05
卷期号:7 (9): 2884-2892
被引量:60
标识
DOI:10.1021/acsenergylett.2c01555
摘要
Achieving operational stability at high current densities remains a challenge in CO2 electrolyzers due to flooding of the gas diffusion layer (GDL) that supports the electrocatalyst. We mitigated electrode flooding at high current densities using a vacuum-assisted infiltration method to embed 200–400 nm-sized polytetrafluoroethylene (PTFE) particles at the interface of the microporous layer (MPL) and carbon cloth in a commercial GDL. In CO2 electrolysis to CO over a silver nanoparticle catalyst on the GDL, the PTFE-embedded GDL not only just exhibited less than 10% of the electrolyte seepage rates observed in untreated GDLs at a current density of 300 mA·cm–2 but also expanded the electrochemical active area across the testing conditions. The PTFE-embedded GDL also maintained a Faradaic efficiency for CO2 electrolysis to CO above 80% for more than 100 h at 100 mA·cm–2, which was a 50-fold improvement in the stable operation time of the electrolyzer.
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