Photoassisted hydrogen evolution over spinel CuM2O4 (M = Al, Cr, Mn, Fe and Co)
Identifieur interne : 000870 ( Main/Exploration ); précédent : 000869; suivant : 000871Photoassisted hydrogen evolution over spinel CuM2O4 (M = Al, Cr, Mn, Fe and Co)
Auteurs : S. Saadi [Algérie] ; A. Bouguelia [Algérie] ; M. Trari [Algérie]Source :
- Renewable energy [ 0960-1481 ] ; 2006.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Hydrogène.
English descriptors
- KwdEn :
Abstract
The photocatalytic ability of CuM2O4 (M = Al, Cr, Mn, Fe and Co) crystallizing with spinel-type structure has been evaluated according to the H2-evolution. The oxides are black and displayed a semiconducting behavior where the electronic balance comes from a small over stochiometry (CuCo2O4.016). Electron hopping occurs between similar sites in normal spinel with a low activation energy whereas larger energies were found in inverse spinel. The electrodes were characterized photoelectrochemically and acquired the characteristic of p-type semiconductors. The conduction band edge, determined from intensity-potential curves, is located below the H2O/H2 potential leading to a thermodynamically favorable H2-liberation under visible light. The photoactivity was dependent on preparative conditions and the best results were obtained over CuCo2O4 prepared through nitrate route in presence of SO2-3 (3.6mlh-1g-1). Improved photoactivity may be interpreted in terms of flat band potential and electronegativity. The presence of cobalt contributes to increase the electron affinity, a desirable property for p-type specimen. It has been observed that the amount of evolved H2 rose using stronger reductors by increasing the band bending. The initial performance of catalyst was almost restored using a fresh reactant solution. With time, the water reduction slowed down because the end products S2-n and S2O2-6 compete with the adsorbed water for the photoelectrons.
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Bouguelia</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Stockage et de Valorisation des Energies Renouvelables, Faculté de Chimie, U.S.T.H.B BP 32</s1><s2>16111 Algiers</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Algérie</country><placeName><settlement type="city">Alger</settlement><region nuts="2">Wilaya d'Alger</region></placeName></affiliation></author><author><name sortKey="Trari, M" sort="Trari, M" uniqKey="Trari M" first="M." last="Trari">M. Trari</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Stockage et de Valorisation des Energies Renouvelables, Faculté de Chimie, U.S.T.H.B BP 32</s1><s2>16111 Algiers</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Algérie</country><placeName><settlement type="city">Alger</settlement><region nuts="2">Wilaya d'Alger</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">06-0474176</idno><date when="2006">2006</date><idno type="stanalyst">PASCAL 06-0474176 INIST</idno><idno type="RBID">Pascal:06-0474176</idno><idno type="wicri:Area/PascalFrancis/Corpus">000158</idno><idno type="wicri:Area/PascalFrancis/Curation">000137</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000159</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000159</idno><idno type="wicri:doubleKey">0960-1481:2006:Saadi S:photoassisted:hydrogen:evolution</idno><idno type="wicri:Area/Main/Merge">000879</idno><idno type="wicri:Area/Main/Curation">000870</idno><idno type="wicri:Area/Main/Exploration">000870</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Photoassisted hydrogen evolution over spinel CuM<sub>2</sub>O<sub>4</sub> (M = Al, Cr, Mn, Fe and Co)</title><author><name sortKey="Saadi, S" sort="Saadi, S" uniqKey="Saadi S" first="S." last="Saadi">S. Saadi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Stockage et de Valorisation des Energies Renouvelables, Faculté de Chimie, U.S.T.H.B BP 32</s1><s2>16111 Algiers</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Algérie</country><placeName><settlement type="city">Alger</settlement><region nuts="2">Wilaya d'Alger</region></placeName></affiliation></author><author><name sortKey="Bouguelia, A" sort="Bouguelia, A" uniqKey="Bouguelia A" first="A." last="Bouguelia">A. Bouguelia</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Stockage et de Valorisation des Energies Renouvelables, Faculté de Chimie, U.S.T.H.B BP 32</s1><s2>16111 Algiers</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Algérie</country><placeName><settlement type="city">Alger</settlement><region nuts="2">Wilaya d'Alger</region></placeName></affiliation></author><author><name sortKey="Trari, M" sort="Trari, M" uniqKey="Trari M" first="M." last="Trari">M. Trari</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Stockage et de Valorisation des Energies Renouvelables, Faculté de Chimie, U.S.T.H.B BP 32</s1><s2>16111 Algiers</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Algérie</country><placeName><settlement type="city">Alger</settlement><region nuts="2">Wilaya d'Alger</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Renewable energy</title><title level="j" type="abbreviated">Renew. energy</title><idno type="ISSN">0960-1481</idno><imprint><date when="2006">2006</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Renewable energy</title><title level="j" type="abbreviated">Renew. energy</title><idno type="ISSN">0960-1481</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Copper Cobalt Oxides</term><term>Experimental study</term><term>Hydrogen</term><term>Hydrogen production</term><term>Nitrates</term><term>Optimization</term><term>Photocatalysis</term><term>Renewable energy</term><term>Spinel</term><term>X ray diffractometry</term><term>p type semiconductor</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Hydrogène</term><term>Nitrate</term><term>Energie renouvelable</term><term>Production hydrogène</term><term>Photocatalyse</term><term>Spinelle</term><term>Semiconducteur type p</term><term>Etude expérimentale</term><term>Diffractométrie RX</term><term>Cuivre Cobalt Oxyde</term><term>Optimisation</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Hydrogène</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The photocatalytic ability of CuM<sub>2</sub>O<sub>4</sub> (M = Al, Cr, Mn, Fe and Co) crystallizing with spinel-type structure has been evaluated according to the H<sub>2</sub>-evolution. The oxides are black and displayed a semiconducting behavior where the electronic balance comes from a small over stochiometry (CuCo<sub>2</sub>O<sub>4.016</sub>). Electron hopping occurs between similar sites in normal spinel with a low activation energy whereas larger energies were found in inverse spinel. The electrodes were characterized photoelectrochemically and acquired the characteristic of p-type semiconductors. The conduction band edge, determined from intensity-potential curves, is located below the H<sub>2</sub>O/H<sub>2</sub> potential leading to a thermodynamically favorable H<sub>2</sub>-liberation under visible light. The photoactivity was dependent on preparative conditions and the best results were obtained over CuCo<sub>2</sub>O<sub>4</sub> prepared through nitrate route in presence of SO<sup>2-</sup><sub>3</sub> (3.6mlh<sup>-1</sup>g<sup>-1</sup>). Improved photoactivity may be interpreted in terms of flat band potential and electronegativity. The presence of cobalt contributes to increase the electron affinity, a desirable property for p-type specimen. It has been observed that the amount of evolved H<sub>2</sub> rose using stronger reductors by increasing the band bending. The initial performance of catalyst was almost restored using a fresh reactant solution. With time, the water reduction slowed down because the end products S<sup>2-</sup><sub>n</sub> and S<sub>2</sub>O<sup>2-</sup><sub>6</sub> compete with the adsorbed water for the photoelectrons.</div></front></TEI><affiliations><list><country><li>Algérie</li></country><region><li>Wilaya d'Alger</li></region><settlement><li>Alger</li></settlement></list><tree><country name="Algérie"><region name="Wilaya d'Alger"><name sortKey="Saadi, S" sort="Saadi, S" uniqKey="Saadi S" first="S." last="Saadi">S. Saadi</name></region><name sortKey="Bouguelia, A" sort="Bouguelia, A" uniqKey="Bouguelia A" first="A." last="Bouguelia">A. Bouguelia</name><name sortKey="Trari, M" sort="Trari, M" uniqKey="Trari M" first="M." last="Trari">M. Trari</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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