Effect of the preparation methodology on some physical and electrochemical properties of Ti/IrxSn(1−x)O2 materials

Ribeiro, Josimar; Alves, Paula D. P.; Andrade, Adalgisa R. de

doi:10.1007/s10853-007-1906-1

Cited by 21 publications

(23 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Supported Pt-based catalysts were synthesized by thermal decomposition of a polymeric precursor (DPP) as previously described [28,[40][41][42]. First, the Pt and W polymeric precursors (metal-resin) were prepared separately.…”

Section: Catalysts Preparationmentioning

confidence: 99%

Effect of W on PtSn/C catalysts for ethanol electrooxidation

et al. 2008

View full text Add to dashboard Cite

Binary and ternary Pt-based catalysts were prepared by the Pechini-Adams modified method on carbon Vulcan XC-72, and different nominal compositions were characterized by TEM and XRD. XRD showed that the electrocatalysts consisted of the Pt displaced phase, suggesting the formation of a solid solution between the metals Pt/W and Pt/Sn. Electrochemical investigations on these different electrode materials were carried out as a function of the electrocatalyst composition, in acid medium (0.5 mol dm -3 H 2 SO 4 ) and in the presence of ethanol. The results obtained at room temperature showed that the PtSnW/C catalyst display better catalytic activity for ethanol oxidation compared to PtW/C catalyst. The reaction products (acetaldehyde, acetic acid and carbon dioxide) were analyzed by HPLC and identified by in situ infrared reflectance spectroscopy. The latter technique also allowed identification of the intermediate and adsorbed species. The presence of linearly adsorbed CO and CO 2 indicated that the cleavage of the C-C bond in the ethanol substrate occurred during the oxidation process. At 90°C, the Pt 85 Sn 8 W 7 /C catalyst gave higher current and power performances as anode material in a direct ethanol fuel cell (DEFC).

show abstract

Section: Catalysts Preparationmentioning

confidence: 99%

Effect of W on PtSn/C catalysts for ethanol electrooxidation

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Besides leading to chloro-alkali production, dimensionally stable anode (DSA Ò ) electrodes are also a good alternative to the oxidation of various organic compounds [5]. In this investigation, we propose some materials that have been prepared and characterized by our group in recent years [6][7][8][9][10]. From the wide range of investigated materials and compositions, we have chosen the ones which displayed the best performance concerning life stability, catalytic activity, cost, and easiness of preparation.…”

Section: Introductionmentioning

confidence: 99%

“…The working anodes were 2-cm 2 large, and they were prepared by thermal decomposition. The precursor mixtures were applied on both sides of the pre-treated Ti support by brushing, as described in previous works; details about the preparation, methodologies, and the physical and electrochemical characterization of these anodes are given elsewhere [6][7][8][9][10]. Two spiraled platinized platinum wires (15 cm), placed parallel to each other, were used as counter electrodes.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical degradation of glyphosate formulations at DSA® anodes in chloride medium: an AOX formation study

Neto

Andrade

2009

J Appl Electrochem

View full text Add to dashboard Cite

The electrochemical degradation of different glyphosate herbicide formulations on RuO 2 and IrO 2 DSA Ò electrodes is investigated. Parameters that could influence the formation of organochloride compounds during electrolysis are studied. The effects of chloride concentration, electrodic composition, current density, and electrolysis time are reported. The influence of the oxide composition on herbicide degradation seems to be almost insignificant; however, there is a straight relationship between anode composition and organic halides formation. Commercial herbicide formulations have lower degradation rates and lead to the formation of a larger quantities of organochloride compounds. In high chloride concentrations, there is a significant increase in organic mineralization, and the relationship between chloride concentration and organic halides formation is direct. Only in low chloride medium investigated the organochloride concentration obtained was below the limit values allowed in Brazil. The determination of organic halides absorbable (AOX) during electrolysis increases significantly with the applied current. Even during long-term electrolysis, a large amount of organochloride compounds is formed.

show abstract

“…Thin film electrodes of nominal compositions: Ti/RuO 2 -Ta 2 O 5 (Ru:Ta-varying by 10 at.% Ru) were prepared by thermal decomposition of a polymeric precursor solution (DPP) [15][16][17][18][19][20][21]. The ruthenium polymeric precursor (Ruresin) was prepared by first mixing citric acid (CA) (Merck) in ethylene glycol (EG) (Merck) at 60-65°C.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The DPP-method consists of the thermal decomposition of metallic salts dissolved in a mixture of ethylene glycol and citric acid [16][17][18][19][20][21]. This method is a good alternative to SD to overcome metal volatilization [19,20] particularly in the preparation of ternary coating compositions containing SnO 2 [19,20].…”

Section: Introductionmentioning

confidence: 99%

Morphological and electrochemical investigation of RuO2–Ta2O5 oxide films prepared by the Pechini–Adams method

2008

Self Cite

View full text Add to dashboard Cite

Preparation methods can profoundly affect the structural and electrochemical properties of electrocatalytic coatings. In this investigation, RuO 2 -Ta 2 O 5 thin films containing between 10 and 90 at.% Ru were prepared by the Pechini-Adams method. These coatings were electrochemically and physically characterized by cyclic voltammetry, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The composition and morphology of the oxide were investigated before and after accelerated life tests (ALT) by EDX and SEM. SEM results indicate typical mud-flat-cracking morphology for the majority of the films. High resolution SEMs reveal that pure oxide phases exhibit nanoporosity while binary compositions display a very compact structure. EDX analyses reveal considerable amounts of Ru in the coating even after total deactivation. XRD indicated a rutile-type structure for RuO 2 and orthorhombic structure for Ta 2 O 5 . XPS data demonstrate that the binding energy of Ta is affected by Ru addition in the thin films, but the binding energy of Ru is not likewise influenced by Ta. The stability of the electrodes was evaluated by ALT performed at 750 mA cm -2 in 80°C 0.5 mol dm -3 H 2 SO 4 . The performance of electrodes prepared by the Pechini-Adams method is 100% better than that of electrodes prepared by standard thermal decomposition.

show abstract

Effect of the preparation methodology on some physical and electrochemical properties of Ti/IrxSn(1−x)O2 materials

Cited by 21 publications

References 21 publications

Effect of W on PtSn/C catalysts for ethanol electrooxidation

Effect of W on PtSn/C catalysts for ethanol electrooxidation

Electrochemical degradation of glyphosate formulations at DSA® anodes in chloride medium: an AOX formation study

Morphological and electrochemical investigation of RuO2–Ta2O5 oxide films prepared by the Pechini–Adams method

Contact Info

Product

Resources

About