Influential factors on oxygen reduction at La1-xCaxCoO3 electrodes in alkaline electrolyte
Identifieur interne : 000878 ( Main/Exploration ); précédent : 000877; suivant : 000879Influential factors on oxygen reduction at La1-xCaxCoO3 electrodes in alkaline electrolyte
Auteurs : Abderrezak Hammouche [Allemagne] ; Abdelkrim Kahoul [Algérie] ; Dirk Uwe Sauer [Allemagne] ; Rik W. De Doncker [Allemagne]Source :
- Journal of power sources [ 0378-7753 ] ; 2006.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Reduction of oxygen was investigated on porous electrodes made of La1-xCaxCoO3 (with 0 ≤ x ≤ 0.6) perovskite-structured oxides, prepared by a sol-gel process. It was found that both the reaction rate and the electrode active surface area (determined by cyclic voltammetry in a narrow capacitive potential range and by impedance spectroscopy) depend on the partial substitution ratio x, both displaying a maximum value for x nearly equal to 0.4. However, in spite of the parallel trend exhibited by the reduction current and the electroactive surface area parameter, the current varies much more with x, that is, while the change in the surface area amounts to approximately 40% over the explored x range, the current increases fivefold. Subsequent investigation of the electrode surface composition revealed that surface cobalt concentration (estimated by XPS analysis) deviates significantly from the nominal bulk composition (determined by EDX analysis). It follows a similar dependence on x, showing equally a maximum for x near to 0.4. Such a behaviour seems to have a greater effect on the reaction rate, since Co cations are the surface active sites for oxygen electro-reduction.
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Abbas University of Setif</s1><s2>19000 Setif</s2><s3>DZA</s3><sZ>2 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>19000 Setif</wicri:noRegion></affiliation></author><author><name sortKey="Sauer, Dirk Uwe" sort="Sauer, Dirk Uwe" uniqKey="Sauer D" first="Dirk Uwe" last="Sauer">Dirk Uwe Sauer</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Electrochemical Energy Conversion and Storage Systems Group, Institute for Power Electronics and Electrical Drives, Aachen University of Technology, Jägerstrasse. 17-19</s1><s2>52066 Aachen</s2><s3>DEU</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Allemagne</country><placeName><region type="land" nuts="1">Rhénanie-du-Nord-Westphalie</region><region type="district" nuts="2">District de Cologne</region><settlement type="city">Aix-la-Chapelle</settlement></placeName></affiliation></author><author><name sortKey="De Doncker, Rik W" sort="De Doncker, Rik W" uniqKey="De Doncker R" first="Rik W." last="De Doncker">Rik W. De Doncker</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Electrochemical Energy Conversion and Storage Systems Group, Institute for Power Electronics and Electrical Drives, Aachen University of Technology, Jägerstrasse. 17-19</s1><s2>52066 Aachen</s2><s3>DEU</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Allemagne</country><placeName><region type="land" nuts="1">Rhénanie-du-Nord-Westphalie</region><region type="district" nuts="2">District de Cologne</region><settlement type="city">Aix-la-Chapelle</settlement></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of power sources</title><title level="j" type="abbreviated">J. power sources</title><idno type="ISSN">0378-7753</idno><imprint><date when="2006">2006</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of power sources</title><title level="j" type="abbreviated">J. power sources</title><idno type="ISSN">0378-7753</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Chemical reduction</term><term>Cyclic voltammetry</term><term>Electric batteries</term><term>Electrochemical impedance spectroscopy</term><term>Fuel cell</term><term>Lanthanum Calcium Cobalt Oxides</term><term>Porous electrode</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Pile combustible</term><term>Batterie électrique</term><term>Electrode poreuse</term><term>Lanthane Calcium Cobalt Oxyde</term><term>Réduction chimique</term><term>Voltammétrie cyclique</term><term>Spectrométrie impédance électrochimique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Reduction of oxygen was investigated on porous electrodes made of La<sub>1-x</sub>Ca<sub>x</sub>CoO<sub>3</sub> (with 0 ≤ x ≤ 0.6) perovskite-structured oxides, prepared by a sol-gel process. It was found that both the reaction rate and the electrode active surface area (determined by cyclic voltammetry in a narrow capacitive potential range and by impedance spectroscopy) depend on the partial substitution ratio x, both displaying a maximum value for x nearly equal to 0.4. However, in spite of the parallel trend exhibited by the reduction current and the electroactive surface area parameter, the current varies much more with x, that is, while the change in the surface area amounts to approximately 40% over the explored x range, the current increases fivefold. Subsequent investigation of the electrode surface composition revealed that surface cobalt concentration (estimated by XPS analysis) deviates significantly from the nominal bulk composition (determined by EDX analysis). It follows a similar dependence on x, showing equally a maximum for x near to 0.4. Such a behaviour seems to have a greater effect on the reaction rate, since Co cations are the surface active sites for oxygen electro-reduction.</div></front></TEI><affiliations><list><country><li>Algérie</li><li>Allemagne</li></country><region><li>District de Cologne</li><li>Rhénanie-du-Nord-Westphalie</li></region><settlement><li>Aix-la-Chapelle</li></settlement></list><tree><country name="Allemagne"><region name="Rhénanie-du-Nord-Westphalie"><name sortKey="Hammouche, Abderrezak" sort="Hammouche, Abderrezak" uniqKey="Hammouche A" first="Abderrezak" last="Hammouche">Abderrezak Hammouche</name></region><name sortKey="De Doncker, Rik W" sort="De Doncker, Rik W" uniqKey="De Doncker R" first="Rik W." last="De Doncker">Rik W. De Doncker</name><name sortKey="Sauer, Dirk Uwe" sort="Sauer, Dirk Uwe" uniqKey="Sauer D" first="Dirk Uwe" last="Sauer">Dirk Uwe Sauer</name></country><country name="Algérie"><noRegion><name sortKey="Kahoul, Abdelkrim" sort="Kahoul, Abdelkrim" uniqKey="Kahoul A" first="Abdelkrim" last="Kahoul">Abdelkrim Kahoul</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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