Catalytic Effects of Chlorate Ions on the Electrode Reaction Processes of 12-Molybdophosphate and 12-Molybdosilicate

Unoura, Kei; Iwashita, Atuko; Itabashi, Eiki; Tanaka, Nobuyuki

doi:10.1246/bcsj.57.597

Cited by 42 publications

(12 citation statements)

References 8 publications

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“…9 a) contribute to the overall activity, but the electrocatalytic current was maximized when mixed-valent W (V, VI) redox centers were generated within the polytungstate structure. The typical reduction mechanism described for various types of Keggin and Dawson polyoxometalates [9,26,[33][34][35][36][37] (Fig. 9 c).…”

Section: Dynamics Of Charge Transportmentioning

confidence: 99%

“…It is noteworthy that up to now a large portion (ca. 80 %) of POM applications concentrated on their electrocatalytic features, particularly with respect to induced electroactivity of such inert inorganic reactants [9,26,[33][34][35][36][37] as bromate, chlorate, nitrite, hydrogen peroxide (reductions) or ascorbic acid, NADH, and L-cysteine (oxidations). POMs were also reported to have a beneficial effect on oxygen reduction process [28].…”

Section: Introductionmentioning

confidence: 99%

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Hybrid materials utilizing polyelectrolyte-derivatized carbon nanotubes and vanadium-mixed addenda heteropolytungstate for efficient electrochemical charging and electrocatalysis

Sosnowska

Góral-Kurbiel

Skunik-Nuckowska

et al. 2013

J Solid State Electrochem

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Preparation and electrochemical behavior of new hybrid materials composed of multi-walled carbon nanotubes (CNTs) that were derivatized with poly(diallyldimethylammonium) chloride and modified with vanadium-mixed addenda Dawson-type heteropolytungstate, [P 2 W 17 VO 62 ] 8− , is described here. These nanostructured composite systems exhibited fast dynamics of charge propagation. They were characterized by the transport (effectively diffusional) kinetic parameter of approximately 8×10 −8 cm −2 s −1/2 and the specific capacitance parameter of 82 F g −1 (at the charging/discharging current of 200 mA g −1 ). The latter parameter for bare CNTs was found to be only 50 F g −1 under analogous conditions. These observations were based on the results of galvanostatic charging-discharging, cyclic voltammetric, and AC impedance spectroscopic measurements. The improved capacitance properties were attributed to the systems' pseudocapacitive features originating from the fast redox transitions of the [P 2 W 17 VO 62 ] 8− polyanions. In addition to the fast redox conduction, the proposed organicinorganic hybrid materials exhibited interesting electrocatalytic activity toward reduction of bromate in the broad concentration range (sensitivity, 0.24 mA cm −2 mmol −1 dm 3 ).

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Section: Dynamics Of Charge Transportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hybrid materials utilizing polyelectrolyte-derivatized carbon nanotubes and vanadium-mixed addenda heteropolytungstate for efficient electrochemical charging and electrocatalysis

Sosnowska

Góral-Kurbiel

Skunik-Nuckowska

et al. 2013

J Solid State Electrochem

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“…Our group is primarily concerned with the application of this family of HPAs in the development of electrochemical sensors with the HPA acting as a possible electrocatalyst. HPAs in the past have been employed as electrocatalysts for a variety of substrates, such as, NO [16][17][18][19][20][21][22][23][24], H 2 O 2 [25][26][27][28], NADH [29][30][31][32] and the hydrogen evolution reaction [33][34][35][36]. A crucial step in the development of any electrochemical based sensor is the immobilisation of the electrocatalyst onto the electrode surface.…”

Section: Introductionmentioning

confidence: 99%

Solution and solid phase electrochemical behaviour of [Os(bpy)3]3[P2W18O62]

Fay¹,

Dempsey²,

McCormac³

2005

Electrochimica Acta

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Abstract[Os (bpy) indicating surface based processes were present. Electroactive films of the complex were formed on carbon macroelectrodes by the redox switching of the transition metal within the complex. Voltammetric investigations into the film's behaviour in a range of buffer solutions (pH 2.0, 4.5 and 7.0) were performed. The films were found to possess better stability in acidic pH and the same pH dependence for the tungsten-oxo framework of the heteropolyanions as in solution. Solid state electrochemical measurements on mechanically attached microparticles of the complex were performed, with the effect of both the nature and concentration of the aqueous electrolyte on this behaviour being investigated. Upon redox switching between the Os 2+/3+ redox states there is an associated insertion/expulsion of anions from/to the solution phase. Scanning electron micrographs of these solid state films were attained before and after redox cycling. Apparatus and ProceduresThe reference electrode that was employed in organic solvents was a silver wire in contact IR SpectroscopyThe Differential pulse anodic stripping voltammetric (DPASV) experiments were performed so as to confirm the adsorption phenomenon observed in 0.01M electrolyte concentration. Figure 3 illustrates the DPASV of a modified carbon electrode in 0.1M Et 4 NPF 6 after an accumulation step at - As discussed in the previous section the oxidative processes of the Os 2+ centre exhibits characteristics pointing to an interaction between the complex and the electrode surface. As a result a film of the complex could be deposited onto the electrode surface by continuous redox switching through the osmium metal redox couple. Films were formed by cycling the potential of the glassy carbon electrode through the Os 3+/2+ redox process for 250 cycles from 9 a 0.1M TBAPF 6 DMSO solution of the starting complex. Figure 4 [79,80]. Despite the FWHM pointing to the first redox process being monoelectronic we believe it is bielectronic for two reasons. At slower scan rates a slight shoulder has been observed on the first redox process and it is well known that the first two monoelectronic processes are very close in potential. Secondly it is well know that the parent HPA can accept 6 electrons reversibly.The P 2 W 18 O 62 6-Dawson species is stable in pH's from 2.00 to 8.00 and its electrochemical behaviour depends upon the pH of the contacting electrolyte with some of the tungsten-oxo based redox processes involving protonation [75]. As a result we were interested in investigating the effect of solution pH on the redox activity of the film. With increasing pH, the losses. The lower stability of the film towards redox cycling in pH 4.50 is linked to the pH dependent nature of the tungsten-oxo reductions, when at more alkaline pH's the availability of protons which accompany the reductions is less, relative to that in pH 2.00. Scan rate studies were also performed at both pH 2.00 and 4.50, it was found that the peak potentials were independent of scan rate and th...

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“…For example, Launary et al (3), Unoura and co-workers (4,5), and Maeda and co-workers (6,7) have investigated in detail the electrochemical behavior of SiMo 12 in aqueous media, aqueous organic mixed-solvent systems, and organic media, respectively. The electrocatalytic properties of SiMo 12 in homogeneous solution have been recognized and exploited by Unoura et al (8) and Keita et al (9), respectively. Several groups have immobilized SiMo 12 on the surfaces of electrodes using various techniques and studied its electrochemical and electrocatalytic properties.…”

Section: Introductionmentioning

confidence: 99%

Redox Electrochemistry of Silicon Dioxide Gel Films Containing 1:12 Molybdosilicate Acid and Its Electrocatalytic Activity toward the Reduction of Nitrite Ions

Song

Lü

Jiang

et al. 1999

Microchemical Journal

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Catalytic Effects of Chlorate Ions on the Electrode Reaction Processes of 12-Molybdophosphate and 12-Molybdosilicate

Cited by 42 publications

References 8 publications

Hybrid materials utilizing polyelectrolyte-derivatized carbon nanotubes and vanadium-mixed addenda heteropolytungstate for efficient electrochemical charging and electrocatalysis

Hybrid materials utilizing polyelectrolyte-derivatized carbon nanotubes and vanadium-mixed addenda heteropolytungstate for efficient electrochemical charging and electrocatalysis

Solution and solid phase electrochemical behaviour of [Os(bpy)3]3[P2W18O62]

Redox Electrochemistry of Silicon Dioxide Gel Films Containing 1:12 Molybdosilicate Acid and Its Electrocatalytic Activity toward the Reduction of Nitrite Ions

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