Πλοήγηση ανά Θέμα "Electrochemistry"
Αποτελέσματα 1-20 από 53
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Application of Solid oxide proton-conducting electrolytes for amperometric analysis of hydrogen in H-2+N-2+H2O gas mixtures
(2014)Amperometric hydrogen sensors based on proton-conducting solid electrolytes of La0.95Sr0.05YO3, CaTi0.95Sc0.05O3 and CaZr0.9Sc0.1O3 compositions are prepared and investigated in the present work. The influence of the sensor ... -
Benzene electro-oxidation in a PEMFC for phenol and electricity cogeneration
(2005)In the present investigation, the electrochemically-assisted oxidation of benzene in a H2-O2 proton exchange membrane fuel cell (PEMFC), for electricity and phenol cogeneration is studied. Experiments were carried out in ... -
Bi4Cu0.2V1.8O11-delta based membrane electrochemical reactors for propane oxidation at moderate temperatures
(2005)Bi4Cu0.2V1.8O11-delta membrane material was synthesized by following the solid-state method. The oxygen permeation flux at 673 K was found to be 0.5 ml/cm(2) by the use of an external electric power source. The oxidation ... -
Catalytic and Electrocatalytic Activation of Methane over Manganese Oxides Deposited on YSZ
(1997)The catalytic and the electrocatalytic behavior of MnO(x) oxides deposited on Yttria Stabilized Zirconia (YSZ) in the form of thin porous films, was studied during the reaction of methane activation at high methane to ... -
Catalytic Behavior of La(0.6)Sr(0.4)Co(0.8)Fe(0.2)O(3) Perovskite-Type Oxide Thin Films Deposited on YSZ During the Reaction of Ethanol Oxidation
(1998)The perovskite-type oxide La(0.6)Sr(0.4)Co(0.8)Fe(0.2)O(3) was studied as an ethanol oxidation catalyst-anode as a probable candidate for future application in Solid Oxide Fuel Cells (SOFCs). The investigation was carried ... -
CeO2 based materials doped with lanthanides for applications in intermediate temperature electrochemical devices
(2011)The present work aims at the investigation of the influence of different dopants' ionic radius and concentration on the lattice parameters and the density of Ce(1-x)Ln(x)O(2-delta) (x = 0-0.20; Ln = La, Nd, Sm, Eu, Gd, Dy, ... -
Charge transfer in mixed proton, oxygen ion and electron solid oxide conductor
(2005)Analysis of the equivalent scheme of the mixed proton-oxygen ion-electron conductor (MPOEC) allowed to obtain relationships between parameters of the membrane (total conductivity and transfer numbers) and parameters of the ... -
Charge transfer properties of BaCe(0.88)Nd(0.12)O(3-delta) co-ionic electrolyte
(2006)Charge and mass transfer in an electrochemical cell, based on an electrolyte possessing both oxygen ion and proton conductivity (co-ionic electrolyte), under the gradient of steam partial pressure was considered from ... -
Conductivity of Gd-doped BaCeO3 protonic conductor in H-2-H2O-O-2 atmospheres
(2014)In the present investigation, a radically new and simple method of evaluation of the proton conductivity is proposed. This method is based on the conductivity measurement of ceramic materials depending on the oxygen partial ... -
Cu and Gd co-doped BaCeO3 proton conductors: Experimental vs SEM image algorithmic-segmentation results
(2014)Segmentation algorithms for the quantitative description of the surface microstructure and the evaluation of the grain-boundary conductivity of ceramic materials surface using SEM microphotographs analysis was developed ... -
Direct ethanol fuel cell anode simulation model
(2006)The electrochemical behavior of a direct ethanol feed proton exchange membrane fuel cell (DEFC) operating under steady-state isothermal conditions at 1 atm at both anode and cathode sides is considered. A mathematical model ... -
Direct ethanol PEM fuel cells: The case of platinum based anodes
(2005)PtSn/C catalysts were prepared by the direct decoration of Pt/C with Sn through a modified poly process. XRD results showed there existed obvious SnO2 in this catalyst, different from the PtSn/C prepared by co-precipitation, ... -
Direct methanol fuel cells: Methanol crossover and its influence on single DMFC performance
(2004)In the present investigation, the methanol crossover rate through Nafion((R))-115 membrane at different temperatures and different concentrations had been investigated in a fuel cell test apparatus by using gas chromatography ... -
Direct methanol fuel cells: The effect of electrode fabrication procedure on MEAs structural properties and cell performance
(2005)In the present paper, the effect of electrode preparation procedure on the structural properties of membrane electrode assembly (MEA) and consequently on the performance of direct methanol fuel cells (DMFCs) was investigated. ... -
The effect of co-dopant addition on the properties of Ln(0.2)Ce(0.8)O(2-delta) (Ln = Gd, Sm, La) solid-state electrolyte
(2008)The present work aims at the investigation of Ln(0.2)Ce(0.8)O(2-delta) (where Ln = Sm, La, Gd) structural and electrical properties when in the Ln sub-lattice, Ba2+ and Sr2+ with ionic radii 1.42 and 1.26 angstrom, ... -
The effect of methanol and ethanol cross-over on the performance of PtRu/C-based anode DAFCs
(2005)In the present work, the cross-over rates of methanol and ethanol, respectively, through Nafion®-115 membranes at different temperatures and different concentrations have been measured and compared. The changes of Nafion®-115 ... -
The effect of the MEA preparation procedure on both ethanol crossover and DEFC performance
(2005)In the present work, the changes of Nafion((R))-115 membrane porosity in the presence of ethanol aqueous solutions of different concentrations were determined by weighing vacuum-dried and ethanol solution-equilibrated ... -
The effect of the parasitic current on the direct ethanol PEM fuel cell operation
(2008)In the present work the effect of the parasitic or leakage current, I, which is the result of the ethanol crossover through the polymer electrolyte membrane (PEM) from the anode to the cathode side of the cell, on both the ... -
Electricity from ethanol fed SOFCs: the expectations for sustainable development and technological benefits
(2004)Based on a thermodynamic and economic analysis presented in the first part of this paper, ethanol is considered as an alternative fuel with suitable characteristics for electricity generation in SOFCs. Ethanol fed steam ... -
Electrochemical Promotion of Pt During the Oxidation of Ethanol
(2001)The reaction of ethanol oxidation has been examined over a Pt polycrystalline film deposited on an yttria stabilized zirconia (YSZ) electrochemical reactor. Experiments were carried out at 325 degrees C at atmospheric total ...