Conductivity of phosphoric acid: an in situ comparative study of proton in phosphoric acid fuel cell

Paul, Thierry; Banerjee, Dipali; Kargupta, Kajari

doi:10.1007/s11581-015-1426-y

Cited by 10 publications

(3 citation statements)

References 27 publications

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“…This can be explained by the improved proton conductivity of the phosphoric acid doped membrane brought by acid dilution when the water content in the anode gas is increased [21]. On one hand, in the operating temperature range of the HT-PEM fuel cell (140°C -180°C) the proton conductivity of the PA-H 2 O system decreases with the increase in the acid concentration [22,23], which means the acid dilution results in the increase in the membrane conductivity in this temperature range. The proton transfer in the phosphoric acid doped PBI membrane derives from the breakage and formation of the hydrogen bond.…”

Section: Methodsmentioning

confidence: 99%

Investigation of the Effect of Humidity Level of H₂ on Cell Performance of a HT‐PEM Fuel Cell

2019

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High temperature polymer electrolyte membrane (HT‐PEM) fuel cell is often integrated with a light fossil fuel reformer to improve the fuel flexibility. Although the operation of HT‐PEM fuel cell does not rely on the humidification of the inlet gas, water vapor is found in the reformate gas which is fed to the HT‐PEM fuel cell. In this work, the influence of water content in the H2 to the cell performance of a HT‐PEM fuel cell is studied under different operating temperatures. Under lower operating temperature of 140 °C, the HT‐PEM fuel cell shows the best performance with low water content in the H2. With increasing water content, the cell performance decreases. Under the operating temperature of 160 °C, the best cell performance is achieved with an intermediate water content in the H2. While under high operating temperature of 180 °C, the cell performance shows an increasing trend with the increase in the water content. By measuring the impedance spectra of the HT‐PEM fuel cell, the reasons for the different influence of anode humidification in cell performance at different operating temperatures were investigated.

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Section: Methodsmentioning

confidence: 99%

Investigation of the Effect of Humidity Level of H₂ on Cell Performance of a HT‐PEM Fuel Cell

2019

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“…Here, 88 wt% phosphoric acid (Merck, India) was used as an electrolyte. The details of the experimental set up were also reported elsewhere [1] , [2] . A glass mat soaked in the phosphoric acid was used as a solid electrolyte.…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Data for phase angle shift with frequency

2016

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Phase angle shift between the current and voltage with frequency has been reported for a single phosphoric acid fuel cell in the cell temperature from 100 °C to 160 °C and the humidifier temperature from 40 °C to 90 °C. An electrochemical workbench is employed to find the shift. The figure of phase angle shift shows a peak in high humidifier temperatures. The peak in phase angle shift directs to lower frequency side with decreasing humidifier temperature. The estimation of electrochemical reaction time is also evaluated in the humidifier temperature zone from 50 °C to 90 °C.

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“…The strong and extensive hydrogen bonding network of PA causes its high viscosity and its Grotthuss mechanism with high intrinsic conductivity, which renders PA the most stable and most efficient proton carrier for HT-PEMFCs to date (Fig. 2) [55,56]. While the proton conduction mechanism in HT-PEMFCs does not involve solely PA as the proton carrier, the PA/phosphate approach has thus far yielded superior performance and durability.…”

Section: Pa-doped Pbi Membranesmentioning

confidence: 99%

Overcoming the Electrode Challenges of High-Temperature Proton Exchange Membrane Fuel Cells

Meyer

Yang

Cheng

et al. 2023

Electrochem. Energy Rev.

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Proton exchange membrane fuel cells (PEMFCs) are becoming a major part of a greener and more sustainable future. However, the costs of high-purity hydrogen and noble metal catalysts alongside the complexity of the PEMFC system severely hamper their commercialization. Operating PEMFCs at high temperatures (HT-PEMFCs, above 120 °C) brings several advantages, such as increased tolerance to contaminants, more affordable catalysts, and operations without liquid water, hence considerably simplifying the system. While recent progresses in proton exchange membranes for HT-PEMFCs have made this technology more viable, the HT-PEMFC viscous acid electrolyte lowers the active site utilization by unevenly diffusing into the catalyst layer while it acutely poisons the catalytic sites. In recent years, the synthesis of platinum group metal (PGM) and PGM-free catalysts with higher acid tolerance and phosphate-promoted oxygen reduction reaction, in conjunction with the design of catalyst layers with improved acid distribution and more triple-phase boundaries, has provided great opportunities for more efficient HT-PEMFCs. The progress in these two interconnected fields is reviewed here, with recommendations for the most promising routes worthy of further investigation. Using these approaches, the performance and durability of HT-PEMFCs will be significantly improved.

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Conductivity of phosphoric acid: an in situ comparative study of proton in phosphoric acid fuel cell

Cited by 10 publications

References 27 publications

Investigation of the Effect of Humidity Level of H₂ on Cell Performance of a HT‐PEM Fuel Cell

Investigation of the Effect of Humidity Level of H₂ on Cell Performance of a HT‐PEM Fuel Cell

Data for phase angle shift with frequency

Overcoming the Electrode Challenges of High-Temperature Proton Exchange Membrane Fuel Cells

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Conductivity of phosphoric acid: an in situ comparative study of proton in phosphoric acid fuel cell

Cited by 10 publications

References 27 publications

Investigation of the Effect of Humidity Level of H2 on Cell Performance of a HT‐PEM Fuel Cell

Investigation of the Effect of Humidity Level of H2 on Cell Performance of a HT‐PEM Fuel Cell

Data for phase angle shift with frequency

Overcoming the Electrode Challenges of High-Temperature Proton Exchange Membrane Fuel Cells

Contact Info

Product

Resources

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Investigation of the Effect of Humidity Level of H₂ on Cell Performance of a HT‐PEM Fuel Cell

Investigation of the Effect of Humidity Level of H₂ on Cell Performance of a HT‐PEM Fuel Cell