Anode and cathode overpotentials and temperature profiles in a PEMFC

Herrera, Omar E.; Wilkinson, David P.; Mérida, Walter

doi:10.1016/j.jpowsour.2011.09.042

Cited by 53 publications

(35 citation statements)

References 24 publications

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“…ergies 2016, 9,47 rive at the CL via diffusion and are consumed at the hydrogen and oxygen electrodes, respectivel otably, the hydrogen mass fraction decreases from the gas flow channel to the CL along line Athe hydrogen side. The oxygen mass fraction exhibits a similar trend in the gas flow channel to th along line A-A at the oxygen side.…”

Section: Resultsmentioning

confidence: 99%

“…ergies 2016, 9,47 Model Description Figure 1 shows the computational domain of a 2D URFC model, which includes a gas flow channe L, catalyst layer (CL) at the hydrogen and oxygen sides respectively, and a PEM sandwiche tween the two sides. The gases in the gas flow channel at the hydrogen side are a mixture of H d H2O, and those in the gas flow channel at the oxygen side are a mixture of O2 and H2O.…”

Section: Model Descriptionmentioning

confidence: 99%

“…The vast literature on experimental research and modeling of PEMFC deal with the water, heat management (e.g., [9][10][11]) and mass transport (e.g., [12][13][14]). Hu et al [13] built a comprehensive model which accounted for the transport phenomena occurring in the PEMFC such as mass transfer, electrochemical kinetics and charge transport.…”

Section: Introductionmentioning

confidence: 99%

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Two-Dimensional Simulation of Mass Transfer in Unitized Regenerative Fuel Cells under Operation Mode Switching

Wang

Guo

et al. 2016

Energies

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Abstract:A two-dimensional, single-phase, isothermal, multicomponent, transient model is built to investigate the transport phenomena in unitized regenerative fuel cells (URFCs) under the condition of switching from the fuel cell (FC) mode to the water electrolysis (WE) mode. The model is coupled with an electrochemical reaction. The proton exchange membrane (PEM) is selected as the solid electrolyte of the URFC. The work is motivated by the need to elucidate the complex mass transfer and electrochemical process under operation mode switching in order to improve the performance of PEM URFC. A set of governing equations, including conservation of mass, momentum, species, and charge, are considered. These equations are solved by the finite element method. The simulation results indicate the distributions of hydrogen, oxygen, water mass fraction, and electrolyte potential response to the transient phenomena via saltation under operation mode switching. The hydrogen mass fraction gradients are smaller than the oxygen mass fraction gradients. The average mass fractions of the reactants (oxygen and hydrogen) and product (water) exhibit evident differences between each layer in the steady state of the FC mode. By contrast, the average mass fractions of the reactant (water) and products (oxygen and hydrogen) exhibit only slight differences between each layer in the steady state of the WE mode. Under either the FC mode or the WE mode, the duration of the transient state is only approximately 0.2 s.

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Section: Resultsmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Two-Dimensional Simulation of Mass Transfer in Unitized Regenerative Fuel Cells under Operation Mode Switching

Wang

Guo

et al. 2016

Energies

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“…However, recent work demonstrates that this assumption is not valid under out-ofspecification conditions (e.g., dry anodes, fuel starvation, etc.) [10,11]. Herrera et al have researched the anode and cathode overpotentials separately employing reference electrodes and multi-component gas analysis [11].…”

Section: Introductionmentioning

confidence: 99%

“…[10,11]. Herrera et al have researched the anode and cathode overpotentials separately employing reference electrodes and multi-component gas analysis [11]. Their work looked at three different operating conditions: a) baseline, b) flooding and c) drying.…”

Section: Introductionmentioning

confidence: 99%

Transport phenomena in polymer electrolyte membrane fuel cells via voltage loss breakdown

Flick

Dhanushkodi

Mérida

2015

Journal of Power Sources

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High Safety Fuel Cells Based on Gas Diffusion Layer Suppressed Uneven Current and Thermal Runaway

Ning,

Zhu,

Liu

et al. 2024

Adv Funct Materials

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Thermal runaway poses a critical safety concern for fuel cells, significantly impairing their performance and durability. Uneven current often leads to uneven temperature, exacerbating the risk of thermal runaway. The inadequate electrical and thermal conductivity of the gas diffusion layer (GDL) is identified as the primary cause of the safety issues. To address this, a multilayer composite gas diffusion layer (MC‐GDL) is proposed and designed to enhance both electrical and thermal conductivity. The in‐plane electrical conductivity of the MC‐GDL reaches an impressive 9.1 × 104 S m−1. Under extreme uneven current, the fuel cell's performance with MC‐GDL only declines by 3.7%, compared to a substantial 58.1% decline observed with commercial GDL. Additionally, the in‐plane thermal conductivity of the MC‐GDL is notably high at 337.0 W m−1 K−1. Under extreme uneven temperature, the maximum temperature of Nafion membrane in fuel cell equipped with MC‐GDL is only 84.2 °C significantly lower than the 180.7 °C observed with commercial GDL. Consequently, the MC‐GDL effectively prevents the melting, thinning, and perforation of the Nafion membrane, thereby mitigating thermal runaway. Furthermore, the superior electrical and thermal conductivity of MC‐GDL can enhance the safety of other electrochemical devices by minimizing uneven current and thermal runaway.

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Anode and cathode overpotentials and temperature profiles in a PEMFC

Cited by 53 publications

References 24 publications

Two-Dimensional Simulation of Mass Transfer in Unitized Regenerative Fuel Cells under Operation Mode Switching

Two-Dimensional Simulation of Mass Transfer in Unitized Regenerative Fuel Cells under Operation Mode Switching

Transport phenomena in polymer electrolyte membrane fuel cells via voltage loss breakdown

High Safety Fuel Cells Based on Gas Diffusion Layer Suppressed Uneven Current and Thermal Runaway

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