Hexagonal nanorods of tungsten trioxide: Synthesis, structure, electrochemical properties and activity as supporting material in electrocatalysis

Polyoxometallate-assisted integration of nanostructures of Au and ZrO 2 to form supports for electrocatalytic PtRu nanoparticles: enhancement of their activity toward oxidation of ethanol

“…The voltammetric responses of Fig. 8 are consistent with literature reports on the oxidation of ethanol at platinum-based catalysts [23][24][25][26][27][28][29][30]. An important issue is that the highest ethanol oxidation currents have been reported following dispersion of PtRu nanoparticles onto the hybrid ZrO 2 -Au/PMo 12 support (Fig.…”

“…Introduction of tin or ruthenium sites (by utilization of bimetallic PtSn or PtRu [23,[26][27][28][29][30]) was reported to induce activation interfacial water molecules and formation of hydroxyl groups capable of the oxidative removal of CO-type adsorbates to CO 2 in acid medium. The final activity of these bimetallic systems during the electrooxidation of ethanol was largely dependent on the choice of matrix, deposition environment and the activation procedure [4,[26][27][28][29][30]. While PtSn was often found to be more reactive during ethanol oxidation, PtRu exhibited higher stability during long-term operation [4] and, therefore, is considered here.…”

Hydrothermally synthesized tungsten trioxide nanorods as NO2 gas sensors

“…Among the existing hydrothermal methods, WO 3 nanorods are usually synthesized at a reaction temperature higher than 180 1C. Salmaoui et al have reported synthesis of WO 3 nanorods by using a hydrothermal method at a temperature of 180 1C for 72 h by using aniline and sodium sulfate together as structure-directing templates [24]. Qin et al reported preparation of W 18 O 49 nanorods at 200 1C by using tungsten hexachloride (WCl 6 ) as a tungsten precursor and cyclohexanol as a reaction solvent [25].…”

Electroanalysis of Ethanol Oxidation and Reactivity of Platinum-Ruthenium Catalysts Supported onto Nanostructured Titanium Dioxide Matrices

“…4, 5 and 6) and literature reports, 22,24,[27][28][29][63][64][65][66] it can be rationalized that, at the potential as low 0.34 V, electrooxidation of ethanol at PtRu-based catalysts proceeds through simple dehydrogenation to acetaldehyde. 58,59 In other words, the reaction involves two-electrons, and no other parallel pathways (neither oxidation to acetic acid nor to carbon dioxide) are expected under potentials below 0.35 V. To comment on the dynamics of this reaction, we have performed diagnostic chronoamperometric experiments as for Fig.…”

“…9 Representative examples include studies with use of titanium(IV) oxide, [19][20][21][22] tungsten(VI) oxide [22][23][24][25] and zirconium(IV) oxide. [26][27][28][29] Any specific interactions between catalytic sites and the metal oxide matrix as well as the system's interfacial ion and electron transfer processes would be influenced by the distribution of electronic states within the oxide.…”