Mathematical Modeling and Experimental Study of Proton Exchange Membrane Fuel Cells

Grigoriev, S.A.; Kalinnikov, A. A.; Porembsky, V.I.; Фатеев, В. Н.

doi:10.1007/1-4020-3498-9_21

Cited by 2 publications

(3 citation statements)

References 1 publication

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“…where

y_{H_{2}}^{PTL}

is the molar fraction of hydrogen in the PTL,

{\overset{\cdot}{N}}_{H_{2}}^{PTL}

and

{\overset{\cdot}{N}}_{H_{2} O}^{PTL}

are the molar flux of hydrogen and water across the PTL respectively, c is the global molar concentration of the hydrogen/water mixture,

D_{H_{2}, H_{2} O}^{eff}

is the effective diffusion coefficient and x PTL is the PTL thickness.

D_{H_{2}, H_{2} O}^{eff}

was used instead of the intrinsic diffusion coefficient,

D_{H_{2}, H_{2} O}

since the first one takes into account the PTL porosity , which affects the mass transport across the diffusion layer. Furthermore, the effect of both the temperature and pressure on

D_{H_{2}, H_{2} O}^{eff}

was considered as well through:

true {scriptD}_{H_{2}, H_{2} O}^{eff} (T, P) = {scriptD}_{H_{2}, H_{2} O}^{0} (T^{0}, P^{0}) \frac{P^{0}}{P} {(\frac{T}{T^{0}})}^{3 false/ 2} \cdot ε_{PTL}^{3 false/ 2}

…”

Section: Modelingmentioning

confidence: 99%

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Feasibility of Hydrogen Compression in an Electrochemical System: Focus on Water Transport Mechanisms

et al. 2019

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In this study, the behavior of an electrochemical hydrogen compressor (EHC) able to compress hydrogen up to 32 bar was investigated. The current density distribution along the EHC was measured using a segmented cell. It was found to decrease from 0.75 A cm−2 to 0.65 A cm−2 along the EHC when using Nafion 117 and when high relative humidity hydrogen was fed to the EHC (at 0.66 A cm−2 and 0.36 V). This drop corresponded to a decrease of the relative humidity of the hydrogen flow from 90 to 55% along the gas channels at the anode side, evidencing the local dehydration of the PEM due to the unbalanced water transport across the membrane. As a consequence, the membrane resistance increased, thus a higher voltage had to be supplied to the EHC in order to maintain good performances, decreasing the overall efficiency. On the other hand, unstable operating conditions were observed when using hydrogen with a low relative humidity. A pseudo‐2D model was developed along with experimental studies to estimate the physical parameters enhancing the efficiency of the EHC. A higher efficiency was obtained when using a thinner membrane than Nafion 117 (53% vs. 37%, at 60 °C and 0.66 A cm−2).

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“…where

y_{H_{2}}^{PTL}

is the molar fraction of hydrogen in the PTL,

{\overset{\cdot}{N}}_{H_{2}}^{PTL}

and

{\overset{\cdot}{N}}_{H_{2} O}^{PTL}

are the molar flux of hydrogen and water across the PTL respectively, c is the global molar concentration of the hydrogen/water mixture,

D_{H_{2}, H_{2} O}^{eff}

is the effective diffusion coefficient and x PTL is the PTL thickness.

D_{H_{2}, H_{2} O}^{eff}

was used instead of the intrinsic diffusion coefficient,

D_{H_{2}, H_{2} O}

since the first one takes into account the PTL porosity , which affects the mass transport across the diffusion layer. Furthermore, the effect of both the temperature and pressure on

D_{H_{2}, H_{2} O}^{eff}

was considered as well through:

true {scriptD}_{H_{2}, H_{2} O}^{eff} (T, P) = {scriptD}_{H_{2}, H_{2} O}^{0} (T^{0}, P^{0}) \frac{P^{0}}{P} {(\frac{T}{T^{0}})}^{3 false/ 2} \cdot ε_{PTL}^{3 false/ 2}

…”

Section: Modelingmentioning

confidence: 99%

“…Grigoriev et al. carried out a numerical investigation to estimate the maximum output pressure reachable by a single EHC. They found that high output pressures are achievable at low temperatures mainly because of the lower hydrogen permeation.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Hydrogen Compression in an Electrochemical System: Focus on Water Transport Mechanisms

et al. 2019

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“…However, PEMFC components such as bipolar plates and gas diffusion layer (GDL) need optimization [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of a dimensionless number in the cathode channels of a polymer electrolyte membrane fuel cell with different head losses

Han

Kim

Ahn

et al. 2009

Proceedings of the Institution of Mechanical Engineers, Part C:

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This study investigates the effects of stoichiometry, humidity, cell temperature, and pressure on the performance and the flooding of the proton exchange membrane fuel cell. Values of stoichiometry are 1.5, 2.0, and 2.5 at cell temperatures of 50, 55, and 60 • C, respectively. This study shows that the dimensionless flooding value (FV) is a function of the stoichiometry, humidity, temperature, and pressure. The FV is calculated by using the measured values of temperature, humidity, pressure, and flowrate of the cathode. The effect of the dimensionless number on the flooding of the cathode in the proton exchange membrane fuel cell is analysed in this study. The effects of air stoichiometry, cell temperature, and air humidity are also discussed in this article.

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Mathematical Modeling and Experimental Study of Proton Exchange Membrane Fuel Cells

Cited by 2 publications

References 1 publication

Feasibility of Hydrogen Compression in an Electrochemical System: Focus on Water Transport Mechanisms

Feasibility of Hydrogen Compression in an Electrochemical System: Focus on Water Transport Mechanisms

Experimental analysis of a dimensionless number in the cathode channels of a polymer electrolyte membrane fuel cell with different head losses

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