Preparation and electrochemical characterization of Pt nanoparticles dispersed on niobium oxide

Mello, R. L. S.; Mattos-Costa, Flora I.; Villullas, H. de las M.; Bulhões, L.O.S.

doi:10.1590/s0100-46702003000200009

Cited by 6 publications

(6 citation statements)

References 38 publications

(37 reference statements)

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“…An inhouse electrochemical cell was designed for this measurement, with a ZnSe window, which allows the detection of the three bands associated to the typical oxidation products of ethanol. The yield of oxidation products was calculated using the respective integrated band intensities (A i ), and the amount of a given species Q i (mol cm -2 ) inside the thin layer cavity followed the relationship (16) shown in equation 1, where ε effi is the value of the effective absorption coefficient (3.5•10 4 M -1 cm -2 for CO 2 , 5.8•10 3 M -1 cm -2 for acetic acid, and 2.2•10 3 M -1 cm -2 for acetaldehyde).…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

PtNb Deposited on High Surface Area Carbon Support as Catalyst for Ethanol Electroxidation

Rocha¹,

Linares²,

González³

2011

ECS Trans.

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Platinum-niobium catalysts have been proposed as alternative catalysts for ethanol electro-oxidation. Catalysts prepared by a combined alcohol-sodium borohydride reduction method showed crystal sizes in the range of 3-4 nm, with large amounts of niobium oxide, as TPR results confirmed. Platinum decorated on a mixture of Nb2O5 (amorphous and crystalline)/Vulcan XC-72R carbon black was also prepared , with similar crystal sizes. XANES region analyses showed a certain electronic effect in the case of the co-reduction of the two metals, in which a slight alloy fraction was detected. CO stripping results displayed a promising performance of the PtNb/C catalyst, with a small onset potential and a large current density for CO oxidation. Ethanol oxidation tests demonstrated a larger specific activity for the PtNb2O5 (crystalline)/C compared to the other catalysts. Furthermore, a large efficiency for ethanol oxidation was obtained for this platinum-niobium catalyst.

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Section: Electrochemical Characterizationmentioning

confidence: 99%

PtNb Deposited on High Surface Area Carbon Support as Catalyst for Ethanol Electroxidation

Rocha¹,

Linares²,

González³

2011

ECS Trans.

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“…Dispersion of Pt particles into an oxide matrix can lead, depending mainly on the oxide nature, to a Pt-modified oxide with better catalytic properties than pure Pt. − For instance, Pt−WO x nanophases have shown an enhanced activity for the oxidation of methanol, while a significant enhancement for CO and methanol oxidation was reported for electrodeposited Pt nanoparticles on IrO 2 films . Some of us have shown that samples of different compositions containing Pt nanoparticles dispersed on RuO 2 layers also present a considerable activity for methanol oxidation .…”

Section: Introductionmentioning

confidence: 99%

Sol−Gel Prepared Pt-Modified Oxide Layers: Synthesis, Characterization, and Electrocatalytic Activity

et al. 2006

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Thin films of pure RuO2 and IrO2 and mixed Ru0.5Ir0.5O2 oxide modified with Pt particles were prepared by a sol−gel method in the form of thin films of ∼2 μm thickness on Ti substrates. Surface morphology of these Pt-modified oxides was examined by scanning electron microscopy and was found to exhibit a significant influence of the chemical composition of the oxide matrix. Element mapping showed homogeneous distribution of the metals. X-ray diffraction and X-ray photoelectron spectroscopy analyses showed that these films consist of metallic Pt particles dispersed in an oxide matrix. Cyclic voltammetry in acid solutions showed that the sol−gel prepared layers have relatively high Pt surface areas. The electrocatalytic activity of these materials toward the anodic oxidation of formaldehyde and methanol was compared in terms of onset potential and current density and was found to follow the sequence: Pt−Ru0.5Ir0.5O2/Ti > Pt−RuO2/Ti > Pt−IrO2/Ti.

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“…Herbicides are pesticides that are used to kill or slow the growth of weeds. They were categorized based on their activity (contact or systemic), use (soil, pre-emergent or post-emergent) and mode of action on plant biochemical mechanisms [91,92]. In addition, their target is classified as non-selective (kills all surrounding plants) or selective (attacks only weeds and leaves the crop alone) [93].…”

Section: Cvs Of 50 μM Indigo Carmine At Seo 2 -Cpb/gce At Various Sca...mentioning

confidence: 99%

Recent Advances in Voltammetric Sensing

Devnani¹,

Sharma²

2023

Frontiers in Voltammetry

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The practical day to day life is largely affected by the products that we use, the air that we breathe, the soil that is used to grow crops, the water we drink and use for various household chores or industrial purposes. The purity analysis of these products or estimation of useful inorganic and organic analytes is of utmost importance for avoiding health and environment risk. Everyone wants to be aware that what they are eating or applying on their skin is safe for them. A diabetic patient needs to monitor their blood sugar levels constantly. The air, water and soil quality needs constant monitoring to avoid health hazards. Not just this, chemical analysis is crucial as a crime investigation technique to identify suspects. Fuel quality and storage needs to be tested for eliminating unwanted losses. The electrochemical techniques are inherently fast, selective and sensitive and some systems are portable as well which is a boon for on-site monitoring. Voltammetric techniques like cyclic voltammetry, stripping voltammetry, impedance spectroscopy, amperometry and other techniques provide specific information of the analytes to be tested. This chapter will highlight the voltammetric techniques used for different types of analyte sensing and the advances that have taken place recently related to voltammetric sensing.

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Preparation and electrochemical characterization of Pt nanoparticles dispersed on niobium oxide

Cited by 6 publications

References 38 publications

PtNb Deposited on High Surface Area Carbon Support as Catalyst for Ethanol Electroxidation

PtNb Deposited on High Surface Area Carbon Support as Catalyst for Ethanol Electroxidation

Sol−Gel Prepared Pt-Modified Oxide Layers: Synthesis, Characterization, and Electrocatalytic Activity

Recent Advances in Voltammetric Sensing

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