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Researchers developed a catalyst double layer (CDL) structure on a gas diffusion electrode (GDE) without a microporous layer (MPL) for high temperature polymer electrolyte membrane fuel cells (HT-PEMFC). The CDL anodes showed improved performance compared to conventional single layer anodes with MPL. The optimal CDL anodes achieved a peak power density of 0.41W/cm² at 150°C.

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What they did

System
MFC

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Abstract

Catalyst double layer (CDL) structure on gas diffusion electrode (GDE) without microporous layer (MPL) is developed for the anode of high temperature polymer electrolyte membrane fuel cell (HT–PEMFC). Polytetrafluoroethylene and polyvinylidene fluoride is applied for the outer and inner layer as the hydrophobic binder for fabricating 3D electrode structure. The effect of Pt ratio in anode CDLs on the GDE performance was investigated by single cell test and electrochemical analysis using poly(benzimidazole) (PBI)–based membrane, with Pt loading under 0.3 mg/cm 2 at ambient pressure air on 150℃. The results show that optimal CDL anodes present performance of 0.65V at 0.2A/cm 2 and peak power density is 0.41W/cm 2 at mass transfer region which is higher than conventional single layer anode with MPL. Furthermore, the 3D structure of the outer catalyst layer in anode read high catalyst utilization and preventing leakage of electrolyte with a short–term durability test shows good stability with PBI membrane.

Key findings

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Keywords

AnodeElectrolytePolyvinylidene fluorideMembrane electrode assemblyMicroporous materialChemical engineering

Identifiers

DOI
10.1149/ma2022-01351425mtgabs
Journal
ECS Meeting Abstracts
Year
2022