Maximization of high-temperature proton exchange membrane fuel cell performance with the optimum distribution of phosphoric acid

Kwon, Kyungjung; Kim, Tae Young; Yoo, Duck Young; Hong, Suk-Gi; Park, Jung O.

doi:10.1016/j.jpowsour.2008.11.104

Cited by 63 publications

(38 citation statements)

References 18 publications

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“…When the content of phosphoric acid introduced into the MEA is raised, more acid will be absorbed in the membrane and catalyst layer. This improves the proton conductivity of MEA [1,20,25], and reduces R o and R p (Figures 6 and 7). In addition, the increased content of phosphoric acid in the cathode catalyst layer enlarges the active area [25,26].…”

Section: Discussionmentioning

confidence: 93%

Influence of the Interaction Between Phosphoric Acid and Catalyst Layers on the Properties of HT‐PEFCs

Liu

Mohajeri

et al. 2014

Fuel Cells

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The performance of high‐temperature polymer electrolyte fuel cells is influenced by the components in the cell. In order to determine the effects of the platinum loading and the thickness of the anode and the cathode as well as of the phosphoric acid content on the cell performance, a three‐level factorial plan encompassing 15 experimental points was designed and carried out. The experimental results were analyzed statistically and expressed as graphic cubes in the range studied. It was found that each factor and their interactions have strong effects on the cell performance. The interactions are attributed to the distribution of phosphoric acid and gases in the membrane electrode assembly. The water vapor transport influences the concentration of phosphoric acid, which modifies not only the proton conductivity but also the cathode kinetics. The optimized cell performance was obtained with an acid amount of 20 mg cm–2, a cathode thickness of 125 μm (platinum loading of 1.0 mg cm–2), and an anode thickness of 75 μm (platinum loading of 0.6 mg cm–2).

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Section: Discussionmentioning

confidence: 93%

Influence of the Interaction Between Phosphoric Acid and Catalyst Layers on the Properties of HT‐PEFCs

Liu

Mohajeri

et al. 2014

Fuel Cells

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“…As high temperature proton conductive membranes, polybenzimidazole (PBI) membranes are doped with different acids [one of which is Phosphoric acid (PA)] to improve the proton conductivity. It was found that doping the PBI membrane with about 500 mol% of PA resulted in a better property [17].…”

Section: Introductionmentioning

confidence: 99%

Effects of geometry/dimensions of gas flow channels and operating conditions on high-temperature PEM fuel cells

Liu

Hartz

et al. 2014

Int J Energy Environ Eng

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In order to accomplish the objective of studying and optimizing the flow channel geometries and dimensions for high-temperature proton-exchange-membrane (PEM) fuel cells (with operating temperatures above 120°C), a mathematical model has been developed in this work. As the major step of the modeling, the average concentrations of gas species in bulk flows as well as in the layers of electrodes are calculated through mass transfer analysis in one-dimensional direction normal to the membrane-electrodes layers. Therefore, the concentration and activation polarizations are simulated with much less computational work compared to a three-dimensional numerical model. The ohmic loss is taken into consideration through analysis of a representative network circuit simulating the electron and proton conduction in the elements of electrodes and electrolyte, respectively. The simulated results for high-temperature PEM fuel cells were compared with experimental results from literature. The results from the simulation and experimental tests showed good agreement, which validated the mathematical model. As the model requires less computational work, it was used to analyze a large number of cases with different gas flow channel dimensions and operating conditions, and optimization to the dimensions of channels and ribs was accomplished.

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“…These advantages can simplify the fuel cell system design by removing the humidifier and adapting a simpler reformer. Polybenzimidazole (PBI) is usually used as membrane for a phosphoric-acid-based PEMFC [4][5][6]. PBI has excellent durability at temperatures up to 200 °C and retains its mechanical strength, even after absorbing phosphoric acid [7].…”

Section: Introductionmentioning

confidence: 99%

Design and Synthesis of Cross-Linked Copolymer Membranes Based on Poly(benzoxazine) and Polybenzimidazole and Their Application to an Electrolyte Membrane for a High-Temperature PEM Fuel Cell

et al. 2013

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Elevated-temperature (100~200 °C) polymer electrolyte membrane (PEM) fuel cells have many features, such as their high efficiency and simple system design, that make them ideal for residential micro-combined heat and power systems and as a power source for fuel cell electric vehicles. A proton-conducting solid-electrolyte membrane having high conductivity and durability at elevated temperatures is essential, and phosphoric-acid-containing polymeric material synthesized from cross-linked polybenzoxazine has demonstrated feasible characteristics. This paper reviews the design rules, synthesis schemes, and characteristics of this unique polymeric material. Additionally, a membrane electrode assembly (MEA) utilizing this polymer membrane is evaluated in terms of its power density and lifecycle by an in situ accelerated lifetime test. This paper also covers an in-depth discussion ranging from the polymer material design to the cell performance in consideration of commercialization requirements. OPEN ACCESSPolymers 2013, 5 78

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Maximization of high-temperature proton exchange membrane fuel cell performance with the optimum distribution of phosphoric acid

Cited by 63 publications

References 18 publications

Influence of the Interaction Between Phosphoric Acid and Catalyst Layers on the Properties of HT‐PEFCs

Influence of the Interaction Between Phosphoric Acid and Catalyst Layers on the Properties of HT‐PEFCs

Effects of geometry/dimensions of gas flow channels and operating conditions on high-temperature PEM fuel cells

Design and Synthesis of Cross-Linked Copolymer Membranes Based on Poly(benzoxazine) and Polybenzimidazole and Their Application to an Electrolyte Membrane for a High-Temperature PEM Fuel Cell

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