On the temperature distribution in polymer electrolyte fuel cells

Pharoah, Jon G.; Burheim, Odne Stokke

doi:10.1016/j.jpowsour.2010.03.024

Cited by 55 publications

(30 citation statements)

References 24 publications

(47 reference statements)

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“…In the high current-density cases, the catalyst layer ionomer drying could be a result of elevated local temperatures caused by the significant heat production resulting from high currentdensity operation with a large cathode overpotential. Loss of Nafion hydration at high temperature is expected [116], and the elevation of local temperature at the CCM in high current-density operation is well-established in literature [24,102,117].…”

Section: Liquid Water Accumulationmentioning

confidence: 94%

“…This is attributed to the following considerations. Firstly, the local temperatures in the carbon fiber substrate region are lower than in the MPL due to the physical proximity of the MPL to the site of heat production in the cathode catalyst layer [8,24,[101][102][103]. In addition, the MPL has significantly lower porosity and smaller pore sizes than the carbon fiber substrate.…”

Section: Impact Of Humidity On 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: Liquid Water Accumulationmentioning

confidence: 94%

Section: Impact Of Humidity On Water Accumulationmentioning

confidence: 99%

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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“…They observed that passive cooling was significant only at high temperatures and provided up to a quarter of the cooling requirements. With steady-state active cooling, the opBrought to you by | MIT Libraries Authenticated Download Date | 5/11/18 6:59 PM timum cooling occurs when the cooling water inlet temperature is less than 60 ∘ C. Pharoah and Burheim developed a simplified thermal model of a PEMFC which was used to explore the possible temperature gradients in the through-plane of an operating fuel cell at current density of 1 A cm −2 [65]. It was found that under no conditions was the cell isothermal even when both end plates were held at a constant temperature.…”

Section: Heat Generationmentioning

confidence: 99%

Review on management, mechanisms and modelling of thermal processes in PEMFC

Bvumbe¹,

Bujło²,

Tolj³

et al. 2016

Hydrogen and Fuel Cells

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Abstract:In an effort to reduce the environmental impact of the energy sector that is mostly based on fossil fuels, researchers are looking for a clean alternative of our existing energy sources. Hydrogen Energy and Fuel Cells, and in particular Polymer Electrolyte Membrane Fuel Cells (PEMFCs) have emerged as a leading candidate for transportation as well as stationary and portable applications. Due to the irreversibility of the electrochemical reactions and ohmic heating in the fuel cell components, the PEMFC produces a significant amount of heat and this heat has to be removed in order to avoid cell or stack overheating. In this paper, a review of the key heat transfer mechanisms and the various cooling strategies that are available for heat removal from PEMFCs are presented. Due to the interrelated nature and difficulty of conducting in-situ thermal measurements on the operating PEMFCs, computational modelling provides a fast and efficient way of designing PEMFC cooling systems and understanding the heat transfer mechanisms. Therefore PEMFC thermal modelling is also highlighted together with present challenges and potential areas for further research and development works.

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“…The heat transfer sub-model included the conduction heat transfer inside the MEA and convective heat rejection from MEA to cooling water flow and gases. Pharoah and Burheim [24] presented a two-dimensional thermal model and obtained temperature distributions in a PEMFC in the plane normal to the cathode flow direction. In this case, convective heat transfer was neglected.…”

Section: Introductionmentioning

confidence: 99%