PtIr–WO3 nanostructured alloy for electrocatalytic oxidation of ethylene glycol and ethanol

Abstract

In this article, we characterized tungsten oxide-decorated carbon-supported PtIr nanoparticles and tested it for the electrooxidation reactions of ethylene glycol and ethanol. Phase and morphological evaluation of the proposed electrocatalytic materials are investigated employing various characterization techniques including X-ray diffraction (XRD) and transmission electron microscopy (TEM). Electrochemical diagnostic measurements such as cyclic voltammetry, chronoamperometry, and linear sweep voltammetry revealed that the tungsten oxide-modified PtIr/Vulcan nanoparticles have higher catalytic activity for ethylene glycol and ethanol electrooxidation than that of PtIr/Vulcan. A significant enhancement for electrooxidation of CO-adsorbate monolayers occurred in the presence of a transition metal oxide relative to that of pure PtIr/Vulcan electrocatalyst. The likely reasons for this are modification on the Pt center electronic structure and/or increasing the population of reactive oxo groups at the PtIr/Vulcan electrocatalytic interface in different potential regions.

Recent Advances in Anode Electrocatalysts for Direct Formic Acid Fuel Cells – Part I – Fundamentals and Pd Based Catalysts

“…Therefore the dehydrogenation step is facilitated [259][260][261] (3) the oxophilic nature leads to the formation of adsorbed water or OH group at the interface between Pd and the WO 3 at a lower potential, which promotes the oxidative removal of CO from the Pd surface. [260,262,263] In fact, Rutkowska et al found that coating WO 3 nanorods (50-70 nm diameter, 5 micro meter length) with Pd resulted in an improved the catalytic activity of the Pd/WO nanoparticles compared to Pd black. In addition to the electronic effect and bifunctional effect, the presence of partially reduced WO 3 -y or tungsten bronze and WO 3 helps the adsorptive/desorptive phenomena or interfacial O 2 transfer to help CO oxidation.…”

Synthesis of a functionalized carbon supported platinum–iridium nanoparticle catalyst by the rapid chemical reduction method for the anodic reaction of direct methanol fuel cells

“…CO stripping and hydrogen underpotential deposition methods are widely used to determine the ECSA. 22,23 In this study, the ECSAs of PtIr@C and Pt@C catalysts were calculated at a scanning rate of 25 mV s À1 within 0.5 M H 2 SO 4 using the CO stripping method. CO stripping voltammograms of catalysts exposed to CO gas were performed for 15 min (Fig.…”

“…When using a single-layer CO charge value of 420 mC cm À2 , the ECSAs of PtIr@C and Pt@C were calculated to be 20.23 cm 2 and 14.49 cm 2 , respectively, according to the CO peak area. 22,24 According to the ECSA results, it was found that the PtIr@C catalyst has higher CO tolerance and a higher ECSA than Pt@C. Besides, electrochemical impedance spectroscopy (EIS) measurements were performed to better understand the properties of PtIr@C and Pt@C catalysts. Measurements were performed in 1 M KOH solution and 1 M CH 3 OH in the frequency range of 10 kHz to 0.01 Hz as shown in Fig.…”

Influence of Phase Composition of Bulk Tungsten Vanadium Oxides on the Aerobic Transformation of Methanol and Glycerol

“…Indeed, they are well‐known multifunctional materials for fuel cells, in which they are employed as electrocatalysts and supports . Oxygen‐deficient tungsten oxide based materials, known as tungsten bronzes, are catalysts for the electrochemical oxidation of C 2 –C 3 alcohols and hydrogen in acid media . Tungsten oxide bronzes have also been used as electrocatalysts for oxygen reduction, photocatalysts, and as efficient catalysts in the hydrogenation of linear and cyclic alkenes, nitroarenes, and unsaturated organosulfur compounds .…”