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Gas Diffusion Layers:Experimental and Modeling Approach for Morphological and Transport Properties

Accounts of Materials Research 2022年第4期3卷 416-425页

作者： pongsarun satjaritanun Sirivatch Shimpalee Iryna V.Zenyuk Department of Chemical and Biomolecular Engineering and National Fuel Cell Research Center University of California IrvineIrvineCalifornia 92697United States Department of Chemical Engineering University of South CarolinaColumbiaSouth Carolina 29208United States

CONSPECTUS:Electrochemical technologies are key to decarbonizing the energy sector.Electrification of the energy sector is underway with battery technologies dominating the lightduty electric vehicles market.It is more challenging to decarbonize historically difficult to decarbonize sectors,such as heavy-duty transportation,planes,ships,and the chemical manufacturing industry(ammonia,cement,steel).Green hydrogen produced via electrolysis will be used as a fuel and a feedstock in some of these processes.At the heart of the hydrogen economy are polymer electrolyte fuel cells(PEFCs),devices that convert hydrogen into electricity.Gas diffusion layers(GDLs)have an integral role in PEFCs,as they are porous carbon layers that transport reactants and products and also remove heat and conduct electricity.To improve the PEFCs’performance and reduce degradation of materials,an understanding of coupled morphological properties and transport phenomena in the GDLs is needed.In this Account,we emphasize the integration of experimental and modeling approaches to achieve complete understanding of materials and transport properties of the GDLs.Our approach builds in complexity from simpler ex situ experiments to in situ and last to 3-D integrated modeling predictions.GDL morphology is complex,as its fabrication includes several stochastic steps(immersion of GDL in various baths to achieve the desired surface wettability)and only 3-D techniques,such as X-ray computed tomography can capture morphology correctly.Porosity,pore-size distribution,tortuosity,and formation factor are the most important morphological properties of the GDLs.For PEFC applications,water is generated in the catalyst layers and is transported through the GDLs.Therefore,GDL wettability directly impacts water permeability through the GDLs.Using in situ water injection experiments,we directly observe which pores water fill at what liquid pressure.This result provides information about the GDL’s affinity to intake water.GDLs are typically of mixed wettabilities,and

关键词： Diffusion battery simpler

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