Effects of Gas Diffusion Layer Porosity Distribution on Proton Exchange Membrane Fuel Cell

Yang, Penghui; Wang, Yongqing; Yang, Youchen; Li, Yuan; Jin, Zunlong

doi:10.1002/ente.202001012

Cited by 21 publications

(12 citation statements)

References 30 publications

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“…140 Although reducing porosity can enhance the conductivity of the electrode, it also hinders the transmission of gas. 141 In addition, the porosity distribution also seriously affects the uniform distribution of reaction gas and current density within the catalytic layer. Therefore, it is necessary to gradient design the porosity of the GDLs.…”

Section: Gas Diffusion Layers (Gdls) In Pemfcs With High Specific Pow...mentioning

confidence: 99%

Designing proton exchange membrane fuel cells with high specific power density

Zhao

Tao

et al. 2023

J. Mater. Chem. A

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Section: Gas Diffusion Layers (Gdls) In Pemfcs With High Specific Pow...mentioning

confidence: 99%

Designing proton exchange membrane fuel cells with high specific power density

Zhao

Tao

et al. 2023

J. Mater. Chem. A

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“…They concluded that the GDL with a logarithmically decreasing porosity gradient improved the cell performance. Yang et al [ 29 ] numerically analyzed the effects of GDL porosity variation with various increasing gradients from the gas inlet to the outlet, they concluded that a cell with an increasing porosity gradient could increase the current density. Sim et al [ 30 ] achieved a non-uniform porosity distribution by changing the compression ratio of the GDL, the outlet area was less compressed than the inlet area and hence had a larger porosity, and the cell performance increased.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cathode GDL Gradient Porosity Distribution along the Flow Channel Direction on Gas–Liquid Transport and Performance of PEMFC

et al. 2023

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The gas diffusion layer (GDL) is an important component of proton exchange membrane fuel cells (PEMFCs), and its porosity distribution has considerable effects on the transport properties and durability of PEMFCs. A 3-D two-phase flow computation fluid dynamics model was developed in this study, to numerically investigate the effects of three different porosity distributions in a cathode GDL: gradient-increasing (Case 1), gradient-decreasing (Case 3), and uniform constant (Case 2), on the gas–liquid transport and performance of PEMFCs; the novelty lies in the porosity gradient being along the channel direction, and the physical properties of the GDL related to porosity were modified accordingly. The results showed that at a high current density (2400 mA·cm−2), the GDL of Case 1 had a gas velocity of up to 0.5 cm·s−1 along the channel direction. The liquid water in the membrane electrode assembly could be easily removed because of the larger gas velocity and capillary pressure, resulting in a higher oxygen concentration in the GDL and the catalyst layer. Therefore, the cell performance increased. The voltage in Case 1 increased by 8% and 71% compared to Cases 2 and 3, respectively. In addition, this could ameliorate the distribution uniformity of the dissolved water and the current density in the membrane along the channel direction, which was beneficial for the durability of the PEMFC. The distribution of the GDL porosity at lower current densities had a less significant effect on the cell performance. The findings of this study may provide significant guidance for the design and optimization of the GDL in PEMFCs.

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“…Proton exchange membrane fuel cell (PEMFC) has been widely considered as an alternative power source for electric vehicles, regional power stations, and mobile power due to its advantages of zero-emission, fast start-up, and high-energy efficiency. [1][2][3][4] The proton exchange membrane (PEM) is a core component of PEMFC, which plays a key role in separating reaction gas and providing proton transfer channels. [5] A low-temperature fuel cell places high demands on the PEM, including: 1) high proton conductivity; 2) low water and fuel permeation, and 3) long-term mechanical, thermal, and acidic stability.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamic Simulations of Proton and Water Transport Mechanism in a Nafion Pore

2023

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Herein, nonequilibrium molecular dynamics simulations are conducted to study the hydraulic permeation and vehicle transport of protons in proton exchange membranes (PEMs) with different structures. The results indicate that water molecules and hydronium ions are transported in porous PEMs in the form of clusters. Water molecules are more concentrated in the bulk areas of pores, whereas hydronium ions had a high‐density profile near the pore surface areas since sulfonate ions of the side chain exhibit a stronger adsorption effect on hydronium ions. Due to the confined pore size, the slip flow of water molecules and hydronium ions occurs near the pore surfaces and it becomes more significant as side chain separation or pore size increases. As pore size decreases, the reduction of movement region and the deep attractive potential near the pore wall lower the specific enthalpy due to enhanced molecule‐wall collisions. In addition, the transport diffusivity coefficients of positively charged hydronium ions are smaller than that of water molecules due to the stronger Coulomb interactions and hydrogen bonding with negatively charged side chains. Transport diffusivity coefficients of water molecules and hydronium ions increase as pore size and side chain separation increase.

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Effects of Gas Diffusion Layer Porosity Distribution on Proton Exchange Membrane Fuel Cell

Abstract: Figure 4. Fuel cell polarization curves of different porosity models.

Cited by 21 publications

References 30 publications

Designing proton exchange membrane fuel cells with high specific power density

Designing proton exchange membrane fuel cells with high specific power density

Effects of Cathode GDL Gradient Porosity Distribution along the Flow Channel Direction on Gas–Liquid Transport and Performance of PEMFC

Molecular Dynamic Simulations of Proton and Water Transport Mechanism in a Nafion Pore

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