Catálise eletroquímica da redução do bromato em superfícies modificadas por filmes de molibdênio

Bertotti, Mauro; Pletcher, Derek

doi:10.1590/s0100-40421998000200012

Cited by 6 publications

(3 citation statements)

References 14 publications

(19 reference statements)

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“…In the late 1990s, Mo-containing catalysts were found to be useful in the reduction of chlorate, bromate, and iodide anions. [48][49][50][51][52] The electrochemistry of molybdenum and molybdenum oxides has been described in detail. 53 Nakazawa et al 54 employed two types of iron-sulfur clusters, [Fe 4 S 4 (SR) 4 ] 2À (R = C 6 H 5 CH 2 and (CH 3 ) 3 C) and [M 2 Fe 6 S 8 (SCH 2 CH 3 ) 9 ] 3À (M = Mo or W), to catalyze the electrochemical reduction of CO 2 .…”

Section: Copyright R 1985 Crc Pressmentioning

confidence: 99%

A review of catalysts for the electroreduction of carbon dioxide to produce low-carbon fuels

et al. 2014

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This paper reviews recent progress made in identifying electrocatalysts for carbon dioxide (CO2) reduction to produce low-carbon fuels, including CO, HCOOH/HCOO(-), CH2O, CH4, H2C2O4/HC2O4(-), C2H4, CH3OH, CH3CH2OH and others. The electrocatalysts are classified into several categories, including metals, metal alloys, metal oxides, metal complexes, polymers/clusters, enzymes and organic molecules. The catalyts' activity, product selectivity, Faradaic efficiency, catalytic stability and reduction mechanisms during CO2 electroreduction have received detailed treatment. In particular, we review the effects of electrode potential, solution-electrolyte type and composition, temperature, pressure, and other conditions on these catalyst properties. The challenges in achieving highly active and stable CO2 reduction electrocatalysts are analyzed, and several research directions for practical applications are proposed, with the aim of mitigating performance degradation, overcoming additional challenges, and facilitating research and development in this area.

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Section: Copyright R 1985 Crc Pressmentioning

confidence: 99%

A review of catalysts for the electroreduction of carbon dioxide to produce low-carbon fuels

et al. 2014

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“…In summary although the best methods for the detection of bromate still rely on ion chromatography [36], our results compare very positively with other works reporting the direct electrochemical detection of bromate in the low micromolar range. These works make use of modified macroelectrodes of various kinds, mainly tungsten [14] and molybdenum [21] oxides. As a matter of fact, Table 2 shows that the only electrochemical technique reported [12] to be superior to our amperometric method requires a preconcentration step (8 minutes) and the use of mercury electrodes, which is forbidden in certain countries.…”

Section: Bromate Analysis At Wo 3 Filmsmentioning

confidence: 99%

Electroanalysis of Bromate, Iodate and Chlorate at Tungsten Oxide Modified Platinum Microelectrode Arrays

Ordeig¹,

Banks²,

Campo³

et al. 2006

Electroanalysis

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This article describes the direct detection of Bromate, but also of chlorate and iodate, using modified arrays of platinum ultramicroelectrodes. The detection limits for these ions are IOThe formation of a suitable tungsten oxide layer and the optimum analytical conditions are described. These oxide layers are formed electrochemically from hydrogen peroxide-tungstanate solutions in acid conditions. Although film stability may be an issue, particularly at pH > 3, these modified arrays of microelectrodes can be used for analytical purposes. After the analysis, the modifying oxide is easily removed and the Pt microelectrode array recovers its original properties. Finally, the detection limit is calculated using a propagation of errors approach which in the present context turned out more appropriate than IUPACs 3s.

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“…This kind of compound is capable to deliver electrons and to mediate the catalytic transfer of oxygen atoms in a highly-conductive environment. The catalytic function of the molybdenum oxide film has been reported upon the reduction of bromate [38] and iodate [39]. Preliminary experiments aimed at the verification of the electrochemical behavior of modified electrodes prepared by films of different compositions.…”

Section: Anodic Oxidation Of H 2 O 2 At Bare and Coated Electrodesmentioning

confidence: 99%

Electrochemical Codeposition of Platinum and Molybdenum Oxides: Formation of Composite Films with Distinct Electrocatalytic Activity for Hydrogen Peroxide Detection

et al. 2003

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The electrochemical properties of gold electrode surfaces modified by molybdenum oxide films intercalated with platinum microparticles have been described. The incorporation of Pt microparticles at the oxide film was characterized by PIXE (particle induced X-ray emission) spectroscopy. The modified electrode showed electrochemical activity at around À 0.5 V in 50 mmol L À1 Na 2 SO 4 supporting electrolyte (pH 3), corresponding to the reduction of protons at platinum sites and further transfer of hydrogen atoms to form reduced molybdenum oxides (bronzes). At 0.1 V, the MoO 3 / Pt electrode showed a better performance for hydrogen peroxide oxidation than on platinized gold electrodes. The solution pH has a marked effect on the voltammetric profile and best responses for hydrogen peroxide were obtained at the 5.0 to 6.0 pH range. The activation of the electrode by polarization at negative potentials was also studied and a mechanism by which more platinum sites are available as a consequence of this process was proposed. Calibration plots for hydrogen peroxide were highly linear (r 0.9989) in the 0.2 to 1.6 mmol L À1 concentration range, with a relative standard deviation (RSD) < 1%.

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Catálise eletroquímica da redução do bromato em superfícies modificadas por filmes de molibdênio

Cited by 6 publications

References 14 publications

A review of catalysts for the electroreduction of carbon dioxide to produce low-carbon fuels

A review of catalysts for the electroreduction of carbon dioxide to produce low-carbon fuels

Electroanalysis of Bromate, Iodate and Chlorate at Tungsten Oxide Modified Platinum Microelectrode Arrays

Electrochemical Codeposition of Platinum and Molybdenum Oxides: Formation of Composite Films with Distinct Electrocatalytic Activity for Hydrogen Peroxide Detection

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