Characterisation of a electrochemical hydrogen pump using electrochemical impedance spectroscopy

Nguyen, M.-T.; Grigoriev, S.A.; Kalinnikov, A. A.; Филиппов, А. П.; Millet, Pierre; Фатеев, В. Н.

doi:10.1007/s10800-011-0341-9

Cited by 47 publications

(24 citation statements)

References 15 publications

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“…However, the existence of hydrogen at the cathode outlet was detected at air starvation. This hydrogen existence at the cathode agrees with the literature that when the fuel cell starves of oxygen, hydrogen protons pass through the MEA and combine directly with electrons at the cathode side [12,13] in a phenomena that is called hydrogen pumping (equations (1)e(2)) [14].…”

Section: Introductionsupporting

confidence: 90%

Diagnosis of hydrogen crossover and emission in proton exchange membrane fuel cells

Mousa

DeVaal

Golnaraghi

2014

International Journal of Hydrogen Energy

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Keywords: EIS PEM fuel cells Hydrogen leak Hydrogen pumping Air starvation Fuzzy logic a b s t r a c t When hydrogen leaks through holes or cracks in membrane-electrode assemblies (MEAs) in Proton Exchange Membrane (PEM) fuel cells, it recombines directly with air. This recombination results in a reduction in oxygen concentration on the cathode side of the MEA. In this paper, the signatures of electrochemical impedance spectroscopy (EIS) are analyzed in different multi-cell stack configurations to show the relation betweenhydrogen leak rate and reduced oxygen concentrations. The reduction in concentration was made by mixing oxygen with nitrogen at different rates, and the increase in hydrogen leak rate was made by controlling the differential pressure (dP) between anode and cathode. To analyze the impedance signatures, we fit the data of oxygen concentration and dP with the parameters of a Randles circuit. The correlation between the parameters of the two data sets allows us to understand the change in impedance signatures with respect to reduction of oxygen in the cathode side. To have a better insight on the effect of insufficient oxygen at the cathode, a model that establishes a relationship between impedance and voltage was considered. Using this model along with the impedance signatures we were able to detect the reduction of oxygen concentrations at the cathode with the help of fuzzy rule-base. However, resolution of detection was reduced with the reduction of leak rate and/or increases in the stack cell count.

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Section: Introductionsupporting

confidence: 90%

Diagnosis of hydrogen crossover and emission in proton exchange membrane fuel cells

Mousa

DeVaal

Golnaraghi

2014

International Journal of Hydrogen Energy

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“…At the microscale, however, they often suffer from mechanical failure due to fouling or loss in membrane elasticity. 23 Electrokinetic pumps in particular use electrical forces to induce electro-osmotic (EO) fluid flow and offer a popular alternative to mechanical displacement micropumps. Common types of kinetic pumps include electrohydrodynamic, 17 electrokinetic, 18 magnetohydrodynamic, 19 thermomagnetic, 20 electro wetting, 21 electrothermal, 22 and electrochemical.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic pumping, routing and metering by contactless metal-based electro-osmosis

Mavrogiannis

Doria

et al. 2015

Lab Chip

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Over the past decade, many microfluidic platforms for fluid processing have been developed in order to perform on-chip fluidic manipulations. Many of these methods, however, require expensive and bulky external supporting equipment, which are not typically applicable for microsystems requiring portability. We have developed a new type of portable contactless metal electro-osmotic micropump capable of on-chip fluid pumping, routing and metering. The pump operates using two pairs of gallium metal electrodes, which are activated using an external voltage source, and separated from a main flow channel by a thin micron-scale PDMS membrane. The thin contactless membrane allows for field penetration and electro-osmotic (EO) flow within the microchannel, but eliminates electrode damage and sample contamination commonly associated with traditional DC electro-osmotic pumps that utilize electrodes in direct contact with the working fluid. The maximum flow rates and pressures generated by the pump using DI water as a working buffer are 10 nL min(-1) and 30 Pa, respectively. With our current design, the maximum operational conductivity where fluid flow is observed is 0.1 mS cm(-1). Due to the small size and simple fabrication procedure, multiple micropump units can be integrated into a single microfluidic device for automated on-chip routing and sample metering applications. We experimentally demonstrated the ability to quantify micropump electro-osmotic flowrate and pressure as a function of applied voltage, and developed a mathematical model capable of predicting the performance of a contactless micropump for a given external load and internal hydrodynamic microchannel resistance. Finally, we showed that by activating specific pumps within a microchannel network, our micropumps are capable of routing microchannel fluid flow and generating plugs of solute.

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“…The electrochemical membrane hydrogen pump (compressor) [164] for hydrogen purification and compression based on a Nafion-type membrane could also be attributed to membrane electrolysis. In this process, hydrogen molecules are oxidized on the anode, the hydrogen ions …”

Section: Hydrogen Pumpmentioning

confidence: 99%

Membrane electrolysis—History, current status and perspective

Paidar

Фатеев

Bouzek

2016

Electrochimica Acta

282

137

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Please cite this article as: M.Paidar, V.Fateev, K.Bouzek, Membrane electrolysis − history, current status and perspective, Electrochimica Acta http://dx. AbstractThis review is devoted to membrane electrolysis, in particular utilizing ion-selective membranes, as an important part of both existing and emerging industrial electrochemical processes. It aims to provide fundamental information on the history and development, current status and future perspectives of membrane electrolysis. It aims to provide fundamental information on the history and development, current status and future perspectives of membrane electrolysis. An overview of the history of electromembrane processes is given with the focus on brine electrolysis since it is the predominant electrochemical industrial technology utilizing ion-selective membranes. This is followed by a summary of the wide range of hydrogen-based energy conversion processes with different degrees of maturity, i.e. water electrolysis and fuel cells, which promise to become the next generation of major electromembrane processes. The overview of the state-of-the-art is rounded off by a number of smaller-scale processes utilizing ionically conducting solid electrolytes and ion-selective membranes that are already commercially available. The article concludes by considering potential future developments in this exciting field of electrochemistry.

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Characterisation of a electrochemical hydrogen pump using electrochemical impedance spectroscopy

Cited by 47 publications

References 15 publications

Diagnosis of hydrogen crossover and emission in proton exchange membrane fuel cells

Diagnosis of hydrogen crossover and emission in proton exchange membrane fuel cells

Microfluidic pumping, routing and metering by contactless metal-based electro-osmosis

Membrane electrolysis—History, current status and perspective

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