Hydrogen reaction at open circuit in alkaline media on Pt in a gas-diffusion electrode

Cabot, Pere Lluı́s; Alcaide, Francisco; Brillas, Enric

doi:10.1016/j.jelechem.2008.12.013

Cited by 12 publications

(13 citation statements)

References 66 publications

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“…Thus, the apparent activation energy value could be calculated at several selected overpotentials from the slope of the line. The found value 33.8 kJ mol À1 is comparable with values reported in the literature [18,19]. …”

Section: Resultssupporting

confidence: 90%

Low overpotential reduction of dinitrogen to ammonia in aqueous media

Köleli

Kayan

2010

Journal of Electroanalytical Chemistry

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Section: Resultssupporting

confidence: 90%

Low overpotential reduction of dinitrogen to ammonia in aqueous media

Köleli

Kayan

2010

Journal of Electroanalytical Chemistry

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“…2 was proposed in our previous work [26] to fit the silver membrane cathodes impedance spectrum electrolyte resistance (bulk), contact resistances and cell resistances; R1 is the Ohmic resistance of the electrolyte in active pores (or flooded pores) which depends on electrode porosity and wettability and finally R2 is related to kinetics. Similar circuits have already been proposed in the case of cathode [31] and anode [32] in alkaline media. The electrolyte uptake measurements were performed by determining the difference in weight of a 1 cm 2 section of electrode before and after immersion in 1M KOH.…”

Section: Characterization Of Silver Membranessupporting

confidence: 54%

Cathode development for alkaline fuel cells based on a porous silver membrane

Bidault

Kucernak

2011

Journal of Power Sources

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Abstract:Porous silver membranes were investigated as potential substrates for alkaline fuel cell cathodes by the means of polarisation curves and electrochemical impedance spectroscopy measurements. The silver membranes provide both electrocatalytic function, mechanical support and a means of current collection. Improved performance, compare to a previous design, was obtained by increasing gas accessibility (using Teflon AF instead of PTFE suspension) and by adding a catalyst improvement compare to the previous design.

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“…However, in alkaline media, the HOR on polycrystalline Pt has been suggested to have an exchange current density two orders of magnitude lower than that in acid [43], and so the activation polarization at the anode in alkaline fuel cells cannot be negated so easily [28]. In fact, in order to take advantage of the ability to use cheaper cathode catalysts in AFCs, anode HOR catalysis is a vitally important and oft-neglected area of required improvement [34,44].…”

Section: The Hor In Alkalinementioning

confidence: 99%

“…These slower kinetics in alkaline were predicted to contribute significant anode overpotentials of ∼130 mV if the ultralow loading of Pt used on PEM anodes [42] is employed in AFCs, underlining the need for anode catalyst development in order to take advantage of potentially cheaper cathode catalysts in AFCs. The other studies of nonbulk metal HOR in alkaline come from Cabot et al [25,44] who used a Pt-containing gas diffusion electrode (GDE) to closely represent the electrodes of a fuel cell in their RDE experiments. They concluded that at low overpotentials (near the OCV), the Tafel reaction is the rate-determining step in a Tafel-Volmer mechanism, with the diffusion of H 2 becoming rate determining at higher overpotentials.…”

Section: The Hor In Alkalinementioning

confidence: 99%

Alkaline Anion Exchange Membrane Fuel Cells

Jervis¹,

Brett²

2014

Materials for Low‐Temperature Fuel Cells

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Fuel cells represent a potentially integral technology in a greener electricitybased energy economy. Converting chemical energy directly into electricity with no moving parts and no particulate or greenhouse gas emissions at point of operation, they can offer higher efficiencies than combustion and greater energy storage and reduced "charge" times compared with batteries. While they retain few of the disadvantages of existing electricity generation technologies, a major barrier to commercialization and widespread use at present is cost. The key working part of a fuel cell, the membrane electrode assembly (MEA), comprises a catalyst, usually containing platinum, and an ionic polymer membrane, both of which contribute significantly to the overall cost of a fuel cell. This chapter will concentrate on the potential for alkaline anion exchange membrane (AAEM) fuel cells to provide a route to reduced costs and help realize commercial ubiquity of fuel cells in various energy sectors. We will first discuss the basic principles of the more common acidic PEM fuel cells and the thermodynamics and kinetics of the electrochemical reactions governing their operation, before explaining the key differences in AAEM fuel cells and how they might provide an advantage over the more established technology.This basic idea of the fuel cell goes back to as far as 1839 when Swanseaborn physicist Sir William Gove realized that reverse electrolysis of water was possible. However, development from this concept was slow and it was not until the 1960s and the Apollo Space Programme that fuel cells became practicable, in the form of aqueous alkaline electrolyte fuel cells. Aqueous electrolyte-based fuel cells have many disadvantages for portability causing recent focus to shift toward solid electrolytes, in particular toward polymer electrolyte membrane (PEM) fuel cells. These employ an ionomer, which is a polymer containing an ionic functional group in the monomer, as the electrolyte in order to allow hydrogen ion transport through a nonaqueous medium. Recent improvements in membrane technology, and in particular the performance of the industry standard Nafion membranes, have made PEM fuel cells a major focus of research. The alkaline 3 Materials for Low-Temperature Fuel Cells, First Edition. Edited

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Hydrogen reaction at open circuit in alkaline media on Pt in a gas-diffusion electrode

Cited by 12 publications

References 66 publications

Low overpotential reduction of dinitrogen to ammonia in aqueous media

Low overpotential reduction of dinitrogen to ammonia in aqueous media

Cathode development for alkaline fuel cells based on a porous silver membrane

Alkaline Anion Exchange Membrane Fuel Cells

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