Properties of Poly(Vinyl Alcohol)‐Based Composite Membranes for Direct Methanol Fuel Cell Applications

Gao, Tongzhai; Kandel, Bishnu Sharma; Oh, Sae-Joong

doi:10.1002/jccs.200700210

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…Hence, the understanding of water transport properties through this new type of membranes becomes essential [15]. The DAFC operated in the hydroxide-conduction mode offers a cost advantage, especially on polymer electrolyte and catalysts compared to the analogous proton exchange mode [19]. When (OH)ions are present in the fuel stream, comparison between an alkaline and an acidic direct alcohol fuel cell, both using the same catalyst, indicates a better performance of the former, independently of the type of fuel [2].…”

Section: Introductionmentioning

confidence: 99%

Swelling properties of alkali-metal doped polymeric anion-exchange membranes in alcohol media for application in fuel cells

Lain

Barragán

2016

International Journal of Hydrogen Energy

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Section: Introductionmentioning

confidence: 99%

Swelling properties of alkali-metal doped polymeric anion-exchange membranes in alcohol media for application in fuel cells

Lain

Barragán

2016

International Journal of Hydrogen Energy

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“…55,56 Membrane electrolytes are to have high conductivity at low temperature (less than 50 • C) and low relative humidity (less than 50%). A new class of hetero(poly acid)-poly(vinyl alcohol) (HPA-PVA) membranes is currently being developed for fuel cells, [57][58][59][60] with some very initial work extended to capacitors. 53 Other liquid, non-aqueous electrolytes are also of interest.…”

Section: Resultsmentioning

confidence: 99%

“…A new class of hetero(poly acid)-poly(vinyl alcohol) (HPA-PVA) membranes is currently being developed for fuel cells, [57][58][59][60] with some very initial work extended to capacitors. 53 Other liquid, non-aqueous electrolytes are also of interest.…”

Section: E3273mentioning

confidence: 99%

Mathematical Modeling of Hybrid Asymmetric Electrochemical Capacitors

Weidner

2014

J. Electrochem. Soc.

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Electrochemical capacitors may be ideal energy storage devices for applications ranging from renewable energy storage to transportation. Electrochemical capacitors are characterized by high power density and cycle life, and can be classified based on the properties of their electrodes. Symmetric capacitors have two electrodes that exhibit the same behavior, while asymmetric capacitors have two electrodes that exhibit different behavior. A hybrid asymmetric capacitor is a device that has two electrodes that behave differently because of different processes occurring in them. In this paper, we present a mathematical model of hybrid asymmetric capacitors made up of a redox couple electrode and a double-layer electrode. We show that, because of the different behavior of each electrode, the hybrid asymmetric capacitor possesses higher energy and power density than the symmetric capacitor. Our model is generic and can be extended to any device so long as the properties of the electrodes are known. Electrochemical energy storage systems like electrochemical capacitors may be ideal to meet the needs of renewable energy storage and electric vehicles.1-3 Electrochemical capacitors are characterized by high power density and high cycle life. In the simplest terms, electrochemical capacitors store energy in the double layer at the interface of an electrically conductive material and the electrolyte. No faradaic reaction occurs. Double layer capacitance is low, usually between 10 and 40 μF cm −2 of electrode surface area. Therefore, high surface area materials are used (e.g., porous carbon electrodes) to significantly increase the capacitance of the device. 4 Because the voltage across a double layer is proportional to the charge stored, the voltage of a device decreases linearly with time during an entire constant-current discharge. In contrast, the voltage across a device where a faradaic reaction occurs across the electrode/electrolyte interface (i.e., a battery) is determined by the activity of the reactants and products. Therefore, its constant-current discharge curve is sigmoidal in shape, and hence the voltage is fairly constant over a significant portion of the discharge. Finally, pseudocapacitance is a term used to describe storage of charge via faradaic reactions where the activities of reactants and products are such that the discharge curve of a device more closely resembles a capacitor than it does a battery. Although pseudocapacitor response is much like a double-layer capacitor, they have considerably higher capacitance, and hence energy.Regardless of the type of device (i.e., double-layer capacitor or pseudocapacitor), the term "capacitor" is valid when the electrodes behave like a capacitor. Major efforts related to double-layer capacitors have focused on understanding the effect of electrode thickness and pore structure on the energy density and device capacity. 5-7Efforts toward developing pseudocapacitors have mostly focused on creating different electrode materials with most emphasis given to metal oxide...

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An approach of balancing the ionic conductivity and mechanical properties of PVA based nanocomposite membrane for DMFC by various crosslinking agents with ionic liquid

Kakati

Maiti

Das

et al. 2015

International Journal of Hydrogen Energy

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Properties of Poly(Vinyl Alcohol)‐Based Composite Membranes for Direct Methanol Fuel Cell Applications

Cited by 6 publications

References 15 publications

Swelling properties of alkali-metal doped polymeric anion-exchange membranes in alcohol media for application in fuel cells

Swelling properties of alkali-metal doped polymeric anion-exchange membranes in alcohol media for application in fuel cells

Mathematical Modeling of Hybrid Asymmetric Electrochemical Capacitors

An approach of balancing the ionic conductivity and mechanical properties of PVA based nanocomposite membrane for DMFC by various crosslinking agents with ionic liquid

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