Experimental dissection of oxygen transport resistance in the components of a polymer electrolyte membrane fuel cell

Oh, Hwanyeong; Lee, Jeongwoo; Lee, Guesang; Min, Kyoungdoug; Yi, Jung S.

doi:10.1016/j.jpowsour.2017.01.087

Cited by 79 publications

(47 citation statements)

References 42 publications

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“…Several recent studies [74][75][76][77][78] have focused on measuring the individual transport resistance contributions of the fuel cell layers by performing limiting current measurements with varied pressures, GDL thicknesses, cathode balance gases (also known as oxygen "diluents"), and RH levels. Baker et al [77] determined the relative contributions of the channels, GDL substrate, MPL, and catalyst layer to total transport resistance by manipulating GDL and MPL thicknesses and the operating pressure.…”

Section: Quantifying Oxygen Transport Resistancementioning

confidence: 99%

“…Baker et al [77] determined the relative contributions of the channels, GDL substrate, MPL, and catalyst layer to total transport resistance by manipulating GDL and MPL thicknesses and the operating pressure. Nonoyama et al [75] and Oh et al [78] both used the same method to separate the intermolecular diffusion and Knudsen diffusion components of the oxygen transport resistance. The authors compared their limiting current experiments using cathode gases containing dilute concentrations of oxygen in balance gases of both nitrogen and helium.…”

Section: Quantifying Oxygen Transport Resistancementioning

confidence: 99%

“…Depending on the chosen experimental conditions and on the GDL materials and catalyst loadings, the GDL has been found to contribute between 32% and 61% of the total oxygen transport resistance in the fuel cell [75][76][77][78] in when there is no liquid water present. At low RH, the catalyst layer was generally the largest contributor to the oxygen transport resistance, owing to a decrease in oxygen diffusivity through the ionomer layer when the ionomer was poorly hydrated [78].…”

Section: Effect Of Gdl Liquid Water Accumulationmentioning

confidence: 99%

Section: Effect Of Gdl Liquid Water Accumulationmentioning

confidence: 99%

“…At low RH, the catalyst layer was generally the largest contributor to the oxygen transport resistance, owing to a decrease in oxygen diffusivity through the ionomer layer when the ionomer was poorly hydrated [78]. In references [75][76][77][78], however, the limiting current experiments were performed exclusively in low current-density conditions to avoid liquid water condensation in the GDL. Water accumulation in the cathode GDL of a PEM fuel cell reduces the available pore space for oxygen transport, thereby reducing the effective diffusivity of oxygen through the material [33,79,80].…”

Section: Effect Of Gdl Liquid Water Accumulationmentioning

confidence: 99%

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Liquid water saturation and oxygen transport resistance in polymer electrolyte membrane fuel cell gas diffusion layers

Muirhead

Banerjee

George

et al. 2018

Electrochimica Acta

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In this thesis, the relative humidity (RH) of the cathode reactant gas was investigated as a factor which influences gas diffusion layer (GDL) liquid water accumulation and mass transport-related efficiency losses over a range of operating current densities in a polymer electrolyte membrane (PEM) fuel cell. Limiting current measurements were used to characterize fuel cell oxygen transport resistance while simultaneous measurements of liquid water accumulation were conducted using synchrotron X-ray radiography. GDL porosity distributions were characterized with micro-computed tomography (μCT). The work presented here can be used by researchers to develop improved numerical models to predict GDL liquid water accumulation and to inform the design of next-generation GDL materials to mitigate mass transport-related efficiency losses. This work also contributes an extensive set of concurrent performance and liquid water visualization data to the PEM fuel cell field that can be used for validating multiphase transport models.iii

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Section: Quantifying Oxygen Transport Resistancementioning

confidence: 99%

Section: Quantifying Oxygen Transport Resistancementioning

confidence: 99%

Section: Effect Of Gdl Liquid Water Accumulationmentioning

confidence: 99%

Section: Effect Of Gdl Liquid Water Accumulationmentioning

confidence: 99%

Section: Effect Of Gdl Liquid Water Accumulationmentioning

confidence: 99%

See 3 more Smart Citations

Liquid water saturation and oxygen transport resistance in polymer electrolyte membrane fuel cell gas diffusion layers

Muirhead

Banerjee

George

et al. 2018

Electrochimica Acta

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Perspectives on Challenges and Achievements in Local Oxygen Transport of Low Pt Proton Exchange Membrane Fuel Cells

Cheng

Shen

Wei

et al. 2022

Adv Materials Technologies

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The key to address the cost issue of polymer electrolyte membrane fuel cells (PEMFCs) lies on reducing Pt amount employed in cathode catalyst layers (CCLs). In past decades, researchers focus on developing series of alloy and core–shell electrocatalysts with high oxygen reduction reaction activity in order to alleviate the low Pt loading caused performance loss. However, it is noted that the concentration polarization loss resulting from the cathode oxygen transport plays a more important role as the Pt loading decreases, especially the local oxygen transport through the ultrathin ionomer film covering on Pt surface. This paper reviews the nanomorphology of the ultrathin perfluorinated sulfonic acid ionomer film in CCLs, as well as the local oxygen transport mechanism and the corresponding effects on fuel cell performance in low Pt PEMFCs. In addition, both the detailed local oxygen transport properties in carbon black‐supported Pt membrane electrode assemblies (MEAs) and high surface carbon‐supported MEAs are summarized. Subsequently, numerous innovative strategies and effective approaches of reducing the local oxygen transport resistance are introduced. The new insights proposed in this paper have important implications for enhancing local oxygen transport and designing high‐performance fuel cell electrodes.

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Numerical Development of Concentric Cylinder‐Shaped Dual‐Functional Catalyst Structure for Enhanced Charge Transport in Polymer Electrolyte Fuel Cells

Shin

Liu

Chung

et al. 2020

Advcd Theory and Sims

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Dual‐functional catalyst bilayers of vertical concentric cylinders are proposed and numerically developed using a stochastic modeling approach to improve catalyst utilization for advanced fuel cell applications. A cylindrically bilayered catalyst structure wherein the ion transport materials are confined by concentric outer carbon shells is adopted to increase the number of interconnected electron and ion transport paths. For reliable statistical analysis, each data point is extracted from a set of 25 catalyst layer models to achieve a 95% confidence level. The nanoscale morphologies of the ionomers, including interconnected ion transport networks, surface coverage, and electrochemically active surface areas, are quantitatively evaluated. The statistical investigations reveal that the bilayered cylindrical catalyst structures provide more uniform and improved transport paths for ions and reactants when compared with established catalyst layers. Specifically, the additional ion transport channels in the core of the concentric vertical cylinder enhance catalyst utilization under insufficient ionomer conditions. Furthermore, the bilayered catalyst structures yield remarkably enlarged electrochemically active surface areas, hence facilitating more efficient electron, ion, and reactant transfers to improve catalyst utilization.

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Experimental dissection of oxygen transport resistance in the components of a polymer electrolyte membrane fuel cell

Cited by 79 publications

References 42 publications

Liquid water saturation and oxygen transport resistance in polymer electrolyte membrane fuel cell gas diffusion layers

Liquid water saturation and oxygen transport resistance in polymer electrolyte membrane fuel cell gas diffusion layers

Perspectives on Challenges and Achievements in Local Oxygen Transport of Low Pt Proton Exchange Membrane Fuel Cells

Numerical Development of Concentric Cylinder‐Shaped Dual‐Functional Catalyst Structure for Enhanced Charge Transport in Polymer Electrolyte Fuel Cells

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