Exergy Analysis of a PEM Fuel Cell System with Different Bipolar Plate Flow Fields

Ionescu, Viorel; Buzbuchi, Nicolae; Andronie, A.; Stamatin, I.; Girleanu, Valentin

doi:10.1109/atee.2019.8724871

Cited by 2 publications

(3 citation statements)

References 20 publications

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“…Another set of measurements was conducted with the same BEKKTECH BT-552 testing system under similar humidity and temperature testing conditions, but at different inlet pressures for anode and cathode: 300 kPa and 200 kPa, respectively and at two different backpressures P b,c /P b,a (kPa) : 30/30 and 70/70 [31,32]. From those measurements it was observed an important increase of exergetic efficiency, with 1.5%-11% between current densities of 0.1-0.7 A cm -2 , for one of the fuel cells tested at the higher backpressure (P b,c /P b,a =70/70 kPa) [31]. This exergy gain was attained with the compromise of higher voltage oscillations at current densities over 0.4 A cm -2 and with lower voltage stability at a constant load of 0.5 A cm -2 [32].…”

Section: Resultsmentioning

confidence: 99%

“…´---D 6. 31 It was shown experimentally that ionic conductivity of Nafion membrane depends on the water content and operating temperature. Zawodzinski et al [14] measured the temperature dependence of the conductivity on a Nafion 117 membrane immersed in liquid water in the temperature range from 25 to 90 °C and also proton conductivity as a function of water content λ, reporting that λ was constant at 22 over this range of temperature.…”

Section: Global Variables For Different Domainsmentioning

confidence: 99%

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Water and hydrogen transport modelling through the membrane-electrode assembly of a PEM fuel cell

Ionescu

2020

Phys. Scr.

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Membrane electrode assembly (MEA) formed by a proton exchange membrane (PEM), two catalyst layers and two gas diffusion layers represent the heart of the PEM fuel cell system, being the place where the electrochemical reactions are developed in order to generate electrical power. Due to a complex water production and transportation process through the porous media of MEA, the water management represents one of the most critical issues for the low temperature PEM fuel cell systems, working at 30 °C-80 °C. In the present paper, a one-dimensional mass transport PEMFC model for evaluation of net water flux across the Nafion type membrane was implemented with the Comsol Multiphysis software, based on the finite element method. Hydrogen crossover phenomenon, which may cause a degradation of the reaction sites inside MEA, was also included in the model. The numerical model offered a reasonable prediction of the fuel cell electrical performance in the form of current-voltage characteristic after validation with experimental data from the literature. Fuel cell performance was investigated by modifying the temperature and pressure inside the cell, along with the relative humidity for reactant gases.

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Section: Resultsmentioning

confidence: 99%

Section: Global Variables For Different Domainsmentioning

confidence: 99%

Water and hydrogen transport modelling through the membrane-electrode assembly of a PEM fuel cell

Ionescu

2020

Phys. Scr.

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“…The exergetic analytical tools are reinforced by voltage efficiency monitoring as a direct metric of FC efficiency, which registers the correspondence between measured voltage and theoretical OCV and provides a strong indicator of the degree of reversibility in FC energy conversion processes by comparing the actual work against the maximum work potential [40][41][42][43][44].…”

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confidence: 99%

Exergetic Performance of a PEM Fuel Cell with Laser-Induced Graphene as the Microporous Layer

et al. 2021

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The microporous layer (MPL) constitutes a critical component of the gas diffusion layer within the membrane electrode assembly (MEA) of a proton exchange membrane fuel cell (PEM FC). The MPL plays a fundamental role in various processes during FC operation: control of membrane humidification, heat distribution throughout the MEA, excess water removal from the cathode, and transportation of fuel to the reaction sites. Previously, we investigated the performance of a fuel cell unit employing an MPL based on laser-induced graphene (LIG) produced by the laser pyrolysis of polymeric (polyimide) substrates. The prototype LIG-based unit was tested over the typical range of relative humidity and temperature conditions. The polarization curves observed in that study displayed broad ohmic loss regions and high stability along the concentration loss regions, an interesting electrical behavior that justified developing the present voltage-current density study for the same FC prototype compared to one bearing a commercial pyrolytic carbon black MPL. The same operating conditions as in the first study were applied, in order to properly compare the performance efficiencies between the two systems; these are evaluated by considering the thermodynamic losses influence on the exergy efficiency, to exceed any limitations inherent in the classical energy efficiency analysis.

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Exergy Analysis of a PEM Fuel Cell System with Different Bipolar Plate Flow Fields

Cited by 2 publications

References 20 publications

Water and hydrogen transport modelling through the membrane-electrode assembly of a PEM fuel cell

Water and hydrogen transport modelling through the membrane-electrode assembly of a PEM fuel cell

Exergetic Performance of a PEM Fuel Cell with Laser-Induced Graphene as the Microporous Layer

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