Influence of limiting throat and flow regime on oxygen bubble saturation of polymer electrolyte membrane electrolyzer porous transport layers

Lee, ChungHyuk; Hinebaugh, James; Banerjee, Rupak; Chevalier, S.; Abouatallah, Rami; Wang, Rainey; Bazylak, Aimy

doi:10.1016/j.ijhydene.2016.09.114

Cited by 69 publications

(70 citation statements)

References 47 publications

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“…Lee et al confirmed the positive impact on the water saturation of GDLs having the limiting throat close to the electrode layer, which needs to be breached for the breakthrough to occur. 36 The challenge of developing cost-effective PEM electrolyzer GDLs with optimal porosity, pore size, thickness, and surface properties still persists. In this study, we introduce the development of novel freestanding pore-graded titanium layers for their use as GDLs of a PEM electrolyzer.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive investigation of novel pore-graded gas diffusion layers for high-performance and cost-effective proton exchange membrane electrolyzers

Lettenmeier

Kolb

Sata

et al. 2017

Energy Environ. Sci.

159

148

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Section: Introductionmentioning

confidence: 99%

Comprehensive investigation of novel pore-graded gas diffusion layers for high-performance and cost-effective proton exchange membrane electrolyzers

Lettenmeier

Kolb

Sata

et al. 2017

Energy Environ. Sci.

159

148

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“…So far, PNMs are only rarely applied in water electrolysis research. Experimental studies incorporating microfluidic platforms of pore networks (PNs) are presented by Bazylak et al [36][37][38][39]. Their investigations are based on the correlation of the oxygen flow rate with current density.…”

Section: Introductionmentioning

confidence: 99%

“…The same liquid flow rates and air flow rate of 1 µL min −1 were applied in the numerical simulations in [37]. In [36], higher liquid flow rates of 505 µL min −1 and gas flow rates of 10 to 300 µL min −1 were applied.) It was illustrated that the shape of the penetrating gas fingers and the final saturation of the microfluidic PN with oxygen are dictated by the pore structure when the invasion occurs in a capillary regime.…”

Section: Introductionmentioning

confidence: 99%

Pore Network Simulation of Gas-Liquid Distribution in Porous Transport Layers

et al. 2019

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Pore network models are powerful tools to simulate invasion and transport processes in porous media. They are widely applied in the field of geology and the drying of porous media, and have recently also received attention in fuel cell applications. Here we want to describe and discuss how pore network models can be used as a prescriptive tool for future water electrolysis technologies. In detail, we suggest in a first approach a pore network model of drainage for the prediction of the oxygen and water invasion process inside the anodic porous transport layer at high current densities. We neglect wetting liquid films and show that, in this situation, numerous isolated liquid clusters develop when oxygen invades the pore network. In the simulation with narrow pore size distribution, the volumetric ratio of the liquid transporting clusters connected between the catalyst layer and the water supply channel is only around 3% of the total liquid volume contained inside the pore network at the moment when the water supply route through the pore network is interrupted; whereas around 40% of the volume is occupied by the continuous gas phase. The majority of liquid clusters are disconnected from the water supply routes through the pore network if liquid films along the walls of the porous transport layer are disregarded. Moreover, these clusters hinder the countercurrent oxygen transport. A higher ratio of liquid transporting clusters was obtained for greater pore size distribution. Based on the results of pore network drainage simulations, we sketch a new route for the extraction of transport parameters from Monte Carlo simulations, incorporating pore scale flow computations and Darcy flow.

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“…The pore network determines the morphology as a network of pores and throats where the pores act as reservoirs and the connecting throats define the transport pathways. Several groups have worked with pore network models in defining the transport through porous materials, in applications varying from fuel cell diffusion media,, PEM electrolyzers, redox flow battery electrodes, and rock structures . Banerjee et al .…”

Section: Introductionmentioning

confidence: 99%

Comparison of Electrospun Carbon−Carbon Composite and Commercial Felt for Their Activity and Electrolyte Utilization in Vanadium Redox Flow Batteries

et al. 2018

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A low cost highly active carbon−carbon composite fiber felt was produced by electrospinning a mixture of polyacrylonitrile and carbon black powder using poly acrylic acid as a binder for high carbon black loading. The newly designed high‐surface area electrode material showed promising results for use as electrode material for both the negative and positive half‐cell of vanadium redox flow batteries. Battery test results demonstrated promising performance for the electrospun carbon fibers at current densities below 60 mA cm−2, but were less active at higher values. The microstructure of the felt was characterized by X‐ray computed tomography to obtain the porous pathways, which facilitate electrolyte transport. The obtained results will help us to understand the role of porosity in the performance of the battery and to consequently improve the design of the carbon‐filled electrospun material.

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Influence of limiting throat and flow regime on oxygen bubble saturation of polymer electrolyte membrane electrolyzer porous transport layers

Cited by 69 publications

References 47 publications

Comprehensive investigation of novel pore-graded gas diffusion layers for high-performance and cost-effective proton exchange membrane electrolyzers

Comprehensive investigation of novel pore-graded gas diffusion layers for high-performance and cost-effective proton exchange membrane electrolyzers

Pore Network Simulation of Gas-Liquid Distribution in Porous Transport Layers

Comparison of Electrospun Carbon−Carbon Composite and Commercial Felt for Their Activity and Electrolyte Utilization in Vanadium Redox Flow Batteries

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