Preparation and electrochemical characterization of spinel type Fe-Co3O4 thin film electrodes in alkaline medium
Identifieur interne : 000076 ( Maroc/Analysis ); précédent : 000075; suivant : 000077Preparation and electrochemical characterization of spinel type Fe-Co3O4 thin film electrodes in alkaline medium
Auteurs : E. Laouini [Maroc] ; M. Hamdani [Maroc] ; M. I. S. Pereira [Portugal] ; J. Douch [Maroc] ; M. H. Mendonca [Portugal] ; Y. Berghoute [Maroc] ; R. N. Singh [Inde]Source :
- International journal of hydrogen energy [ 0360-3199 ] ; 2008.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Fer.
English descriptors
- KwdEn :
Abstract
Spinel type Fe-CO3O4 (0, 5 and 10% of Fe) adherent and stable films have been prepared on stainless steel supports using the thermal decomposition method at 400 °C. All the oxides prepared by this method produced the pure spinel phase. The electrochemical characterization of the catalytic films towards O2-evolution has been made using cyclic voltammetry and ac impedance techniques. The data show that the partial replacement of Co-ion by Fe-ion in the cobalt cobaltite CO3O4 leads to electrodes with lower surface areas. On the other hand, an enhancement of the electrocatalytic activity, towards the oxygen evolution, is confirmed by the values calculated for the corrected Tafel slopes. Values ranging from 71 to 44 mV were obtained for the pure and iron containing oxides. The reaction order with respect to OH concentration was found to be ∼ 1 on pure and ∼ 2 on the substituted oxides.
Affiliations:
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Pascal:09-0038187Le document en format XML
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Laouini</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Chimie Physique, Faculté des Sciences, Uniuersité Ibn Zohr, B.P. 8106/S Cité Dakhla</s1><s2>Agadir</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Agadir</wicri:noRegion></affiliation></author><author><name sortKey="Hamdani, M" sort="Hamdani, M" uniqKey="Hamdani M" first="M." last="Hamdani">M. Hamdani</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Chimie Physique, Faculté des Sciences, Uniuersité Ibn Zohr, B.P. 8106/S Cité Dakhla</s1><s2>Agadir</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Agadir</wicri:noRegion></affiliation></author><author><name sortKey="Pereira, M I S" sort="Pereira, M I S" uniqKey="Pereira M" first="M. I. S." last="Pereira">M. I. S. Pereira</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Departamento de Quimica e Bioquímica, Centro Ciências Moleculares e Materiais, Faculdade de Ciências da Uniuersidade de Lisboa, Campo Grande</s1><s2>1749-016, Lisboa</s2><s3>PRT</s3><sZ>3 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Portugal</country><wicri:noRegion>1749-016, Lisboa</wicri:noRegion></affiliation></author><author><name sortKey="Douch, J" sort="Douch, J" uniqKey="Douch J" first="J." last="Douch">J. Douch</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Chimie Physique, Faculté des Sciences, Uniuersité Ibn Zohr, B.P. 8106/S Cité Dakhla</s1><s2>Agadir</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Agadir</wicri:noRegion></affiliation></author><author><name sortKey="Mendonca, M H" sort="Mendonca, M H" uniqKey="Mendonca M" first="M. H." last="Mendonca">M. H. Mendonca</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Departamento de Quimica e Bioquímica, Centro Ciências Moleculares e Materiais, Faculdade de Ciências da Uniuersidade de Lisboa, Campo Grande</s1><s2>1749-016, Lisboa</s2><s3>PRT</s3><sZ>3 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Portugal</country><wicri:noRegion>1749-016, Lisboa</wicri:noRegion></affiliation></author><author><name sortKey="Berghoute, Y" sort="Berghoute, Y" uniqKey="Berghoute Y" first="Y." last="Berghoute">Y. Berghoute</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Chimie Physique, Faculté des Sciences, Uniuersité Ibn Zohr, B.P. 8106/S Cité Dakhla</s1><s2>Agadir</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Agadir</wicri:noRegion></affiliation></author><author><name sortKey="Singh, R N" sort="Singh, R N" uniqKey="Singh R" first="R. N." last="Singh">R. N. Singh</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Chemistry, Faculty of Science, Banaras Hindu University</s1><s2>Varanasi 221 005</s2><s3>IND</s3><sZ>7 aut.</sZ></inist:fA14><country>Inde</country><wicri:noRegion>Varanasi 221 005</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">International journal of hydrogen energy</title><title level="j" type="abbreviated">Int. j. hydrogen energy</title><idno type="ISSN">0360-3199</idno><imprint><date when="2008">2008</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">International journal of hydrogen energy</title><title level="j" type="abbreviated">Int. j. hydrogen energy</title><idno type="ISSN">0360-3199</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cobalt oxide</term><term>Cyclic voltammetry</term><term>Electrocatalysis</term><term>Electrochemical characteristic</term><term>Impedance</term><term>Iron</term><term>Iron oxide</term><term>Preparation</term><term>Spinel</term><term>Stainless steel</term><term>Thermal decomposition</term><term>Thin film</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Préparation</term><term>Caractéristique électrochimique</term><term>Spinelle</term><term>Fer</term><term>Acier inoxydable</term><term>Décomposition thermique</term><term>Voltammétrie cyclique</term><term>Impédance</term><term>Oxyde de cobalt</term><term>Couche mince</term><term>Oxyde de fer</term><term>Electrocatalyse</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Fer</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Spinel type Fe-CO<sub>3</sub>O<sub>4</sub> (0, 5 and 10% of Fe) adherent and stable films have been prepared on stainless steel supports using the thermal decomposition method at 400 °C. All the oxides prepared by this method produced the pure spinel phase. The electrochemical characterization of the catalytic films towards O<sub>2</sub>-evolution has been made using cyclic voltammetry and ac impedance techniques. The data show that the partial replacement of Co-ion by Fe-ion in the cobalt cobaltite CO<sub>3</sub>O<sub>4</sub> leads to electrodes with lower surface areas. On the other hand, an enhancement of the electrocatalytic activity, towards the oxygen evolution, is confirmed by the values calculated for the corrected Tafel slopes. Values ranging from 71 to 44 mV were obtained for the pure and iron containing oxides. The reaction order with respect to OH concentration was found to be ∼ 1 on pure and ∼ 2 on the substituted oxides.</div></front></TEI><affiliations><list><country><li>Inde</li><li>Maroc</li><li>Portugal</li></country></list><tree><country name="Maroc"><noRegion><name sortKey="Laouini, E" sort="Laouini, E" uniqKey="Laouini E" first="E." last="Laouini">E. Laouini</name></noRegion><name sortKey="Berghoute, Y" sort="Berghoute, Y" uniqKey="Berghoute Y" first="Y." last="Berghoute">Y. Berghoute</name><name sortKey="Douch, J" sort="Douch, J" uniqKey="Douch J" first="J." last="Douch">J. Douch</name><name sortKey="Hamdani, M" sort="Hamdani, M" uniqKey="Hamdani M" first="M." last="Hamdani">M. Hamdani</name></country><country name="Portugal"><noRegion><name sortKey="Pereira, M I S" sort="Pereira, M I S" uniqKey="Pereira M" first="M. I. S." last="Pereira">M. I. S. Pereira</name></noRegion><name sortKey="Mendonca, M H" sort="Mendonca, M H" uniqKey="Mendonca M" first="M. H." last="Mendonca">M. H. Mendonca</name></country><country name="Inde"><noRegion><name sortKey="Singh, R N" sort="Singh, R N" uniqKey="Singh R" first="R. N." last="Singh">R. N. Singh</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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