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Preparation and electrocatalytic application of composites containing gold nanoparticles protected with rhodium-substituted polyoxometalates

Identifieur interne : 002714 ( Main/Repository ); précédent : 002713; suivant : 002715

Preparation and electrocatalytic application of composites containing gold nanoparticles protected with rhodium-substituted polyoxometalates

Auteurs : RBID : Pascal:11-0456516

Descripteurs français

English descriptors

Abstract

Substitution of a metal center of phosphomolybdate, PMO12O403- (PMO12), or its tungsten analogue with dirhodium(II) and subsequent stabilization of gold nanoparticles, AuNPs, with Rh2PMo11 are demonstrated. The AuNP-Rh2PMo11 mediates oxidations but adsorbs too weakly for direct modification of electrode materials. Stability in quiescent solution was achieved by modifying glassy carbon (GC) with 3-aminopropyltriethoxysilane (APTES) and then electrostatically assembling AuNP-Rh2PMo11. At GC|APTES|AuNP-Rh2 PMo11, cyclic voltammetry showed the expected set of three reversible peak-pairs for PMo11 in the range -0.2 to 0.6 vs. (Ag/AgCl)/V and the reversible RhII,III couple at 1.0 vs. (Ag/AgCl)/V. The presence of AuNPs increased the current for the reduction of bromate by a factor of 2.5 relative to that at GC|Rh2PMo11, and the electrocatalytic oxidation of methionine displayed characteristics of synergism between the AuNP and RhII . To stabilize AuNP-Rh2PMO11 on a surface in a flow system, GC was modified by electrochemically assisted deposition of a sol-gel with templated 10-nm pores prior to immobilizing the catalyst in the pores. The resulting electrode permitted determination of bromate by flow-injection amperometry with a detection limit of 4.0 x 10-8 mol dm-3.

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Pascal:11-0456516

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<title xml:lang="en" level="a">Preparation and electrocatalytic application of composites containing gold nanoparticles protected with rhodium-substituted polyoxometalates</title>
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<name sortKey="Wiaderek, Kamila M" uniqKey="Wiaderek K">Kamila M. Wiaderek</name>
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<s1>Department of Chemistry and Biochemistry, Miami University</s1>
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<name sortKey="Cox, James A" uniqKey="Cox J">James A. Cox</name>
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<s1>Department of Chemistry and Biochemistry, Miami University</s1>
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<term>Amperometry</term>
<term>Application</term>
<term>Bromates</term>
<term>Bromine Compounds</term>
<term>Composite material</term>
<term>Electrocatalysis</term>
<term>Electrochemical detector</term>
<term>Gold</term>
<term>Heteropolysalt</term>
<term>Indium tin oxide electrode</term>
<term>Inorganic anion</term>
<term>Methionine</term>
<term>Modified material</term>
<term>Morphology</term>
<term>Nanoparticle</term>
<term>Preparation</term>
<term>Rhodium Compounds</term>
<term>Sol gel process</term>
<term>Sulfur containing aminoacid</term>
<term>Surface structure</term>
<term>Transmission electron microscopy</term>
<term>Ultraviolet visible spectrometry</term>
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<term>Préparation</term>
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<term>Application</term>
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<term>Or</term>
<term>Nanoparticule</term>
<term>Rhodium Composé</term>
<term>Hétéropolysel</term>
<term>Procédé sol gel</term>
<term>Electrode ITO</term>
<term>Matériau modifié</term>
<term>Spectrométrie UV visible</term>
<term>Microscopie électronique transmission</term>
<term>Méthionine</term>
<term>Bromate</term>
<term>Ampérométrie</term>
<term>Morphologie</term>
<term>Structure surface</term>
<term>Aminoacide soufré</term>
<term>Anion minéral</term>
<term>Brome Composé</term>
<term>Détecteur électrochimique</term>
<term>Molybdorhodophosphate</term>
<term>Silane(3-aminopropyl triéthoxy)</term>
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<div type="abstract" xml:lang="en">Substitution of a metal center of phosphomolybdate, PMO
<sub>12</sub>
O
<sub>40</sub>
<sup>3-</sup>
(PMO
<sub>12</sub>
), or its tungsten analogue with dirhodium(II) and subsequent stabilization of gold nanoparticles, AuNPs, with Rh
<sub>2</sub>
PMo
<sub>11</sub>
are demonstrated. The AuNP-Rh
<sub>2</sub>
PMo
<sub>11</sub>
mediates oxidations but adsorbs too weakly for direct modification of electrode materials. Stability in quiescent solution was achieved by modifying glassy carbon (GC) with 3-aminopropyltriethoxysilane (APTES) and then electrostatically assembling AuNP-Rh
<sub>2</sub>
PMo
<sub>11</sub>
. At GC|APTES|AuNP-Rh
<sub>2</sub>
PMo
<sub>11</sub>
, cyclic voltammetry showed the expected set of three reversible peak-pairs for PMo
<sub>11</sub>
in the range -0.2 to 0.6 vs. (Ag/AgCl)/V and the reversible Rh
<sup>II,III</sup>
couple at 1.0 vs. (Ag/AgCl)/V. The presence of AuNPs increased the current for the reduction of bromate by a factor of 2.5 relative to that at GC|Rh
<sub>2</sub>
PMo
<sub>11</sub>
, and the electrocatalytic oxidation of methionine displayed characteristics of synergism between the AuNP and Rh
<sup>II</sup>
. To stabilize AuNP-Rh
<sub>2</sub>
PMO
<sub>11</sub>
on a surface in a flow system, GC was modified by electrochemically assisted deposition of a sol-gel with templated 10-nm pores prior to immobilizing the catalyst in the pores. The resulting electrode permitted determination of bromate by flow-injection amperometry with a detection limit of 4.0 x 10
<sup>-8</sup>
mol dm
<sup>-3</sup>
.</div>
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<s0>Substitution of a metal center of phosphomolybdate, PMO
<sub>12</sub>
O
<sub>40</sub>
<sup>3-</sup>
(PMO
<sub>12</sub>
), or its tungsten analogue with dirhodium(II) and subsequent stabilization of gold nanoparticles, AuNPs, with Rh
<sub>2</sub>
PMo
<sub>11</sub>
are demonstrated. The AuNP-Rh
<sub>2</sub>
PMo
<sub>11</sub>
mediates oxidations but adsorbs too weakly for direct modification of electrode materials. Stability in quiescent solution was achieved by modifying glassy carbon (GC) with 3-aminopropyltriethoxysilane (APTES) and then electrostatically assembling AuNP-Rh
<sub>2</sub>
PMo
<sub>11</sub>
. At GC|APTES|AuNP-Rh
<sub>2</sub>
PMo
<sub>11</sub>
, cyclic voltammetry showed the expected set of three reversible peak-pairs for PMo
<sub>11</sub>
in the range -0.2 to 0.6 vs. (Ag/AgCl)/V and the reversible Rh
<sup>II,III</sup>
couple at 1.0 vs. (Ag/AgCl)/V. The presence of AuNPs increased the current for the reduction of bromate by a factor of 2.5 relative to that at GC|Rh
<sub>2</sub>
PMo
<sub>11</sub>
, and the electrocatalytic oxidation of methionine displayed characteristics of synergism between the AuNP and Rh
<sup>II</sup>
. To stabilize AuNP-Rh
<sub>2</sub>
PMO
<sub>11</sub>
on a surface in a flow system, GC was modified by electrochemically assisted deposition of a sol-gel with templated 10-nm pores prior to immobilizing the catalyst in the pores. The resulting electrode permitted determination of bromate by flow-injection amperometry with a detection limit of 4.0 x 10
<sup>-8</sup>
mol dm
<sup>-3</sup>
.</s0>
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<s0>001C01H01</s0>
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<s0>001C04E</s0>
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<s0>Préparation</s0>
<s5>01</s5>
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<s0>Preparation</s0>
<s5>01</s5>
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<s0>Preparación</s0>
<s5>01</s5>
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<s0>Electrocatalyse</s0>
<s5>02</s5>
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<fC03 i1="02" i2="X" l="ENG">
<s0>Electrocatalysis</s0>
<s5>02</s5>
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<s5>02</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE">
<s0>Application</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG">
<s0>Application</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA">
<s0>Aplicación</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE">
<s0>Matériau composite</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG">
<s0>Composite material</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA">
<s0>Material compuesto</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE">
<s0>Or</s0>
<s2>NC</s2>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG">
<s0>Gold</s0>
<s2>NC</s2>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA">
<s0>Oro</s0>
<s2>NC</s2>
<s5>05</s5>
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<s0>Nanoparticule</s0>
<s5>06</s5>
</fC03>
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<s0>Nanoparticle</s0>
<s5>06</s5>
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<s5>06</s5>
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<s2>NC</s2>
<s2>NA</s2>
<s5>07</s5>
</fC03>
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<s0>Rhodium Compounds</s0>
<s2>NC</s2>
<s2>NA</s2>
<s5>07</s5>
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<s0>Rodio Compuesto</s0>
<s2>NC</s2>
<s2>NA</s2>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE">
<s0>Hétéropolysel</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG">
<s0>Heteropolysalt</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA">
<s0>Heteropolisal</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE">
<s0>Procédé sol gel</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG">
<s0>Sol gel process</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA">
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<s5>09</s5>
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<fC03 i1="10" i2="X" l="FRE">
<s0>Electrode ITO</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG">
<s0>Indium tin oxide electrode</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA">
<s0>Electrodo ITO</s0>
<s5>10</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE">
<s0>Matériau modifié</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG">
<s0>Modified material</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA">
<s0>Material modificado</s0>
<s5>11</s5>
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<s0>Spectrométrie UV visible</s0>
<s5>12</s5>
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<s0>Ultraviolet visible spectrometry</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA">
<s0>Espectrometría UV visible</s0>
<s5>12</s5>
</fC03>
<fC03 i1="13" i2="X" l="FRE">
<s0>Microscopie électronique transmission</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="X" l="ENG">
<s0>Transmission electron microscopy</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="X" l="SPA">
<s0>Microscopía electrónica transmisión</s0>
<s5>13</s5>
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<fC03 i1="14" i2="X" l="FRE">
<s0>Méthionine</s0>
<s2>NK</s2>
<s2>FR</s2>
<s5>14</s5>
</fC03>
<fC03 i1="14" i2="X" l="ENG">
<s0>Methionine</s0>
<s2>NK</s2>
<s2>FR</s2>
<s5>14</s5>
</fC03>
<fC03 i1="14" i2="X" l="SPA">
<s0>Metionina</s0>
<s2>NK</s2>
<s2>FR</s2>
<s5>14</s5>
</fC03>
<fC03 i1="15" i2="X" l="FRE">
<s0>Bromate</s0>
<s2>NA</s2>
<s5>15</s5>
</fC03>
<fC03 i1="15" i2="X" l="ENG">
<s0>Bromates</s0>
<s2>NA</s2>
<s5>15</s5>
</fC03>
<fC03 i1="15" i2="X" l="SPA">
<s0>Bromato</s0>
<s2>NA</s2>
<s5>15</s5>
</fC03>
<fC03 i1="16" i2="X" l="FRE">
<s0>Ampérométrie</s0>
<s5>16</s5>
</fC03>
<fC03 i1="16" i2="X" l="ENG">
<s0>Amperometry</s0>
<s5>16</s5>
</fC03>
<fC03 i1="16" i2="X" l="SPA">
<s0>Amperometría</s0>
<s5>16</s5>
</fC03>
<fC03 i1="17" i2="X" l="FRE">
<s0>Morphologie</s0>
<s5>32</s5>
</fC03>
<fC03 i1="17" i2="X" l="ENG">
<s0>Morphology</s0>
<s5>32</s5>
</fC03>
<fC03 i1="17" i2="X" l="SPA">
<s0>Morfología</s0>
<s5>32</s5>
</fC03>
<fC03 i1="18" i2="X" l="FRE">
<s0>Structure surface</s0>
<s5>33</s5>
</fC03>
<fC03 i1="18" i2="X" l="ENG">
<s0>Surface structure</s0>
<s5>33</s5>
</fC03>
<fC03 i1="18" i2="X" l="SPA">
<s0>Estructura superficie</s0>
<s5>33</s5>
</fC03>
<fC03 i1="19" i2="X" l="FRE">
<s0>Aminoacide soufré</s0>
<s5>34</s5>
</fC03>
<fC03 i1="19" i2="X" l="ENG">
<s0>Sulfur containing aminoacid</s0>
<s5>34</s5>
</fC03>
<fC03 i1="19" i2="X" l="SPA">
<s0>Aminoácido azufrado</s0>
<s5>34</s5>
</fC03>
<fC03 i1="20" i2="X" l="FRE">
<s0>Anion minéral</s0>
<s5>35</s5>
</fC03>
<fC03 i1="20" i2="X" l="ENG">
<s0>Inorganic anion</s0>
<s5>35</s5>
</fC03>
<fC03 i1="20" i2="X" l="SPA">
<s0>Anión inorgánico</s0>
<s5>35</s5>
</fC03>
<fC03 i1="21" i2="X" l="FRE">
<s0>Brome Composé</s0>
<s2>NC</s2>
<s2>FR</s2>
<s2>FX</s2>
<s2>NA</s2>
<s5>36</s5>
</fC03>
<fC03 i1="21" i2="X" l="ENG">
<s0>Bromine Compounds</s0>
<s2>NC</s2>
<s2>FR</s2>
<s2>FX</s2>
<s2>NA</s2>
<s5>36</s5>
</fC03>
<fC03 i1="21" i2="X" l="SPA">
<s0>Bromo Compuesto</s0>
<s2>NC</s2>
<s2>FR</s2>
<s2>FX</s2>
<s2>NA</s2>
<s5>36</s5>
</fC03>
<fC03 i1="22" i2="X" l="FRE">
<s0>Détecteur électrochimique</s0>
<s5>37</s5>
</fC03>
<fC03 i1="22" i2="X" l="ENG">
<s0>Electrochemical detector</s0>
<s5>37</s5>
</fC03>
<fC03 i1="22" i2="X" l="SPA">
<s0>Detector electroquímico</s0>
<s5>37</s5>
</fC03>
<fC03 i1="23" i2="X" l="FRE">
<s0>Molybdorhodophosphate</s0>
<s4>INC</s4>
<s5>76</s5>
</fC03>
<fC03 i1="24" i2="X" l="FRE">
<s0>Silane(3-aminopropyl triéthoxy)</s0>
<s4>INC</s4>
<s5>77</s5>
</fC03>
<fC07 i1="01" i2="X" l="FRE">
<s0>Métal transition</s0>
<s2>NC</s2>
<s5>53</s5>
</fC07>
<fC07 i1="01" i2="X" l="ENG">
<s0>Transition metal</s0>
<s2>NC</s2>
<s5>53</s5>
</fC07>
<fC07 i1="01" i2="X" l="SPA">
<s0>Metal transición</s0>
<s2>NC</s2>
<s5>53</s5>
</fC07>
<fC07 i1="02" i2="X" l="FRE">
<s0>Platinoïde</s0>
<s2>NC</s2>
<s5>54</s5>
</fC07>
<fC07 i1="02" i2="X" l="ENG">
<s0>Platinoid</s0>
<s2>NC</s2>
<s5>54</s5>
</fC07>
<fC07 i1="02" i2="X" l="SPA">
<s0>Platinoide</s0>
<s2>NC</s2>
<s5>54</s5>
</fC07>
<fN21>
<s1>311</s1>
</fN21>
</pA>
</standard>
</inist>
</record>

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