Numerical analysis of effects of gas crossover through membrane pinholes in high-temperature proton exchange membrane fuel cells

Chippar, Purushothama; Oh, Kyeongmin; Kim, Whangi; Ju, Hyunchul

doi:10.1016/j.ijhydene.2013.05.117

Cited by 20 publications

(17 citation statements)

References 26 publications

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“…The HT-PEMFC stack model is simplified from the three-dimensional (3-D) high temperature (HT)-PEMFC models [29,[35][36][37][38]. The cell voltage can be determined after the activation loss η act , ohmic loss η ohm , and concentration loss η con are estimated and then subtracted from the thermodynamic equilibrium potential, E nernst , as follows,…”

Section: Ht-pemfc Stack Modulementioning

confidence: 99%

“…In Equation 11, the activation overvoltage, η act , represents the total activation loss, i.e., the sum of the activation loss in the anode side due to the hydrogen oxidation reaction (HOR) and the activation loss in the cathode side due to the oxygen reduction reaction (ORR). The anode and cathode activation losses can be estimated from the Butler-Volmer (B-V) equations for the HOR and ORR, as follows [35]:…”

Section: Ht-pemfc Stack Modulementioning

confidence: 99%

“…α is the transfer coefficient. The exchange current densities for the HOR and ORR, denoted by i re f 0,a and i re f 0,c , respectively, are dependent of temperature, as follows [35]:…”

Section: Of 21mentioning

confidence: 99%

“…Q stack in Equation 25is mainly removed by a coolant flowing through the cooling channels [35]. Triethylene glycol is usually employed as a coolant for HT-PEMFC stacks, owing to its high boiling point around 285 • C. The coolant temperature gradient from the inlet to outlet, ∆T cool can be estimated through a simple heat balance of the total waste heat generation rate from the stack and heat removal rate by the coolant.…”

Section: Of 21mentioning

confidence: 99%

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Performance and Efficiency Analysis of an HT-PEMFC System with an Absorption Chiller for Tri-Generation Applications

Gwak

Kim

et al. 2019

Energies

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An absorption chiller model for tri-generation (combined cooling, heating, and power) is developed and incorporated with the high temperature- (HT-) proton exchange membrane fuel cell (PEMFC) system model that was developed in our previous study. We employ a commercially available flow simulator, Aspen HYSYS, for solving the energy and mass balances of various system components, including an HT-PEMFC stack that is based on a phosphoric acid-doped PBI membrane, natural gas-fueled reformer, LiBr-H2O absorption chiller, balance of plant (BOP) components, and heat exchangers. Since the system’s operating strategy for tri-generation must be changed, depending on cooling or heating loads, a major focus of this study is to analyze system performance and efficiency under different requirements of electricity generation, cooling, and heating conditions. The system simulation results revealed that high-current fuel-cell operation is essential in raising the cooling capacity, but the overall system efficiency is slightly reduced as a result. Using a lower fuel-air ratio for the burner in the reforming module is one alternative that can minimize the reduction in the overall system efficiency under high-current fuel-cell operation and large cooling-capacity modes.

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Section: Ht-pemfc Stack Modulementioning

confidence: 99%

Section: Ht-pemfc Stack Modulementioning

confidence: 99%

“…α is the transfer coefficient. The exchange current densities for the HOR and ORR, denoted by i re f 0,a and i re f 0,c , respectively, are dependent of temperature, as follows [35]:…”

Section: Of 21mentioning

confidence: 99%

Section: Of 21mentioning

confidence: 99%

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Performance and Efficiency Analysis of an HT-PEMFC System with an Absorption Chiller for Tri-Generation Applications

Gwak

Kim

et al. 2019

Energies

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“…Meyer et al [19] investigated the effect of anode dead-end and purge processes on the cell performance by adopting a combinational approach, which involves voltage transients, EIS, off-gas analysis and thermal imaging of the cell. In HT-PEMFC, numerical models were developed by Chippar et al [21,22] to study the effect of reactants crossover on performance. They concluded that reactants crossover in a fresh PBI membrane exhibited a negligible impact on performance and appeared more impact in a more severely degraded membrane or with pinholes in membrane.…”

Section: Introductionmentioning

confidence: 99%

Investigation of water transport and its effect on performance of high-temperature PEM fuel cells

Zhang

Zhou

et al. 2014

Electrochimica Acta

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Numerical modeling of novel cage‐like cross‐linked membranes for enhanced proton conductivity in a high temperature‐polymer electrolyte membrane fuel cell

Kashi Prahlad,

Varghese,

Joseph

et al. 2023

J of Applied Polymer Sci

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Phosphoric acid (PA)‐doped polybenzimidazole (PBI) membranes have encountered several problems associated with high cost, chemical instability, poor solubility in organic solvents, and higher doping level which results in poor mechanical properties and faster degradation of the membrane. Alternative membranes with high proton conductivity and mechanical strength for high‐temperature applications are of great interest, one such membrane being cPBI‐IL X. The cage‐like cross‐linked structure of these membranes shows a dual proton transport path due to which proton conductivity is elevated. The ionic liquid content of these membranes improves the PA absorbing capability and shortens the proton transfer path. These membranes exhibit the highest proton conductivity of 13.3 S/m and better durability compared to existing PBI Membranes. A mathematical model is developed and validated versus published experimental results to account for the proton conductivity of these membranes. The developed model is further investigated for a detailed understanding of polarization phenomena and species distribution.

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Numerical analysis of effects of gas crossover through membrane pinholes in high-temperature proton exchange membrane fuel cells

Cited by 20 publications

References 26 publications

Performance and Efficiency Analysis of an HT-PEMFC System with an Absorption Chiller for Tri-Generation Applications

Performance and Efficiency Analysis of an HT-PEMFC System with an Absorption Chiller for Tri-Generation Applications

Investigation of water transport and its effect on performance of high-temperature PEM fuel cells

Numerical modeling of novel cage‐like cross‐linked membranes for enhanced proton conductivity in a high temperature‐polymer electrolyte membrane fuel cell

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