Effect of vinylphosphonic acid and polymer binders with phosphate groups on performance of high-temperature polymer electrolyte membrane fuel cell

Kim, Do-Hyung; Min, Cheong‐Min; Lee, Eunae; Lee, Jae‐Suk; Pak, Chanho

doi:10.1016/j.cattod.2019.07.046

Cited by 21 publications

(11 citation statements)

References 44 publications

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“…Consequently, it is thought that the amount of O 2 consumption decreases at T ini = 373 K. The proton conductivity of the Nafion membrane increases when the temperature increases, even at a temperature above 373 K [40]. However, we have to consider the degradation of the Nafion membrane under the dehydrated condition [44]. Therefore, it is a challenging issue to control the humidification of the Nafion membrane at a temperature above 373 K.…”

Section: In-plane Distribution Of Mass and Current Density On The Interface Between Nafion Membrane And Anode Catalyst Layer Or The Intermentioning

confidence: 99%

Numerical Simulation on Impacts of Thickness of Nafion Series Membranes and Relative Humidity on PEMFC Operated at 363 K and 373 K

et al. 2021

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The purpose of this study is to understand the impact of the thickness of Nafion membrane, which is a typical polymer electrolyte membrane (PEM) in Polymer Electrolyte Membrane Fuel Cells (PEMFCs), and relative humidity of supply gas on the distributions of H2, O2, H2O concentration and current density on the interface between a Nafion membrane and anode catalyst layer or the interface between a Nafion membrane and cathode catalyst layer. The effect of the initial temperature of the cell (Tini) is also investigated by the numerical simulation using the 3D model by COMSOL Multiphysics. As a result, the current density decreases along with the gas flow through the gas channel irrespective of the Nafion membrane thickness and Tini, which can be explained by the concentration distribution of H2 and O2 consumed by electrochemical reaction. The molar concentration of H2O decreases when the thickness of Nafion membrane increases, irrespective of Tini and the relative humidity of the supply gas. The current density increases with the increase in relative humidity of the supply gas, irrespective of the Nafion membrane thickness and Tini. This study recommends that a thinner Nafion membrane with well-humidified supply gas would promote high power generation at the target temperature of 363 K and 373 K.

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Section: In-plane Distribution Of Mass and Current Density On The Interface Between Nafion Membrane And Anode Catalyst Layer Or The Intermentioning

confidence: 99%

Numerical Simulation on Impacts of Thickness of Nafion Series Membranes and Relative Humidity on PEMFC Operated at 363 K and 373 K

et al. 2021

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“…The actual sizes of the electrode in the MEA were 2.8 cm × 2.8 cm. Details regarding the assembly and the operation of the MEA are available elsewhere [41,42].…”

Section: Measurement Of Membrane Electrode Assembly Performancementioning

confidence: 99%

Preparation of Nanoporous PdIrZn Alloy Catalyst by Dissolving Excess ZnO for Cathode of High- Temperature Polymer Electrolyte Membrane Fuel Cells

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et al. 2019

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Carbon-supported nanoporous palladium-iridium–zinc (NP-PdIrZn) electrocatalyst was prepared through the modification of the alcohol-reduction process following the selective dissolution of excess ZnO nanoparticles using NaOH solution. The electrocatalyst was applied successfully to the cathode for a high-temperature polymer electrolyte membrane fuel cell (HT-PEMFC). X-ray diffraction (XRD) patterns of the NP-PdIrZn nanoparticles suggests formation of the ternary alloy and complete removal of ZnO without the formation of individual Pd, Ir, or Zn nanoparticles. Moreover, transmission electron microscopy (TEM) images displayed porous nanoparticles with an irregular shape, which was generated by removing the ZnO from the PdIrZn–ZnO nanocomposites, and was prepared by using the excessive Zn precursor. The electrochemical surface area (ECSA) of the NP-PdIrZn catalysts was estimated by cyclic voltammetry using a rotating disk electrode method , and the oxygen reduction reaction (ORR) activity was evaluated by a linear sweep method. The NP-PdIrZn catalysts showed larger ECSA and higher ORR activity than those of the PdIr and PdIrZn catalysts, which may be attributed to the increased exposed surface area by selective etching of the ZnO in the composites. Furthermore, the NP-PdIrZn catalyst exhibited excellent performance (0.66 V) in a single cell under the HT-PEMFC condition than those of the PdIr (0.58 V) and PdIrZn (0.62 V) catalysts, indicating that geometric and electronic control of Pd-based alloy can improve the single-cell performance for the HT-PEMFC.

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Section: Introductionmentioning

confidence: 99%

“…The high-temperature PEMFC (HTPEMFC) characteristics have been investigated recently at temperatures over 373 K [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. However, many studies have focused on the R&D of new materials, e.g., membranes and catalysts [7][8][9][10][11][12][13]. Polybenzimidazole-graphene oxide composite membranes were developed and the maximum power of 546 W (voltage of 5.2 V at 105 A) was achieved using 12 cell stacks [7].…”

Section: Introductionmentioning

confidence: 99%

“…Polybenzimidazole-graphene oxide composite membranes were developed and the maximum power of 546 W (voltage of 5.2 V at 105 A) was achieved using 12 cell stacks [7]. New polymers (poly-phenylene oxide) composed of a phosphate group, including methyl phosphonic acid and 6-oxohexyl phosphonic acid, showing good proton activities, were developed as ionomers and binders in order to form an electrode [8]. The electrode containing a surfactant was been fabricated in order to improve the dispersion of the polytetrafluoroethylene binder and in order to enhance the reproducibility during manufacturing of the electrode, which showed a relatively high voltage of 0.65 V at the current density of 0.2 A/cm 2 [9].…”

Section: Introductionmentioning

confidence: 99%

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Impacts of Separator Thickness on Temperature Distribution and Power Generation Characteristics of a Single PEMFC Operated at Higher Temperature of 363 and 373 K

et al. 2022

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The aim of this study is to investigate the effects of the separator thickness on not only the heat and mass transfer characteristics, but also the power generation characteristics of a polymer electrolyte membrane fuel cell (PEMFC) with a thin polymer electrolyte membrane (PEM) and thin gas diffusion layer (GDL) operated at higher temperatures of 363 and 373 K. The in-plane temperature distributions on the back of the separator at the anode and cathode, which are the opposite sides to the GDL, are measured using a thermograph at various initial cell temperatures (Tinit), relative humidity (RH) levels, and supply gas flow rates. The total voltage corresponding to the load current is measured in order to evaluate the performance of the PEMFC. As a result, it is revealed that the effect of the RH on the power generation characteristics is more significant when the separator thickness decreases. It is revealed that the power generation performance obtained at high current densities decreases with the increase in Tinit with thinner separator thicknesses. According to the investigation of the in-plane temperature distribution, it is clarified that the temperature decreases at corner positions in the separator with the separator thickness of 2.0 mm, while the temperature gradually increases along with the gas flow with separator thicknesses of 1.5 mm and 1.0 mm.

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Effect of vinylphosphonic acid and polymer binders with phosphate groups on performance of high-temperature polymer electrolyte membrane fuel cell

Cited by 21 publications

References 44 publications

Numerical Simulation on Impacts of Thickness of Nafion Series Membranes and Relative Humidity on PEMFC Operated at 363 K and 373 K

Numerical Simulation on Impacts of Thickness of Nafion Series Membranes and Relative Humidity on PEMFC Operated at 363 K and 373 K

Preparation of Nanoporous PdIrZn Alloy Catalyst by Dissolving Excess ZnO for Cathode of High- Temperature Polymer Electrolyte Membrane Fuel Cells

Impacts of Separator Thickness on Temperature Distribution and Power Generation Characteristics of a Single PEMFC Operated at Higher Temperature of 363 and 373 K

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