Catalysis on Pd/WO3 and Pd/WO2

Bigey, C.; Maire, G.

doi:10.1006/jcat.2000.3045

Cited by 28 publications

(11 citation statements)

References 66 publications

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“…Diffraction peaks at 26° and 37° were the (011) and (200) planes of WO 2 (JCPDS: 32-1393), indicating that WO 3 was transferred to WO 2 after heating to 600 °C under a CH 4 /H 2 atmosphere well agreed with the previous report. 44 When the temperature was increased to 650 °C, WO 2 was further reduced to metallic W proved by the observed diffraction peaks at 40°, 58°, and 73° originating from the (110), (200), and (211) facets of metallic W (JCPDS: 04-0806). The carburization started at 700 °C and W 2 C was formed as characteristic diffraction peaks at 39°, 34°, and 38° were identified to (102), (002), and (200) planes of W 2 C according to the standard PDF card (JCPDS: 20-1315).…”

Section: Resultsmentioning

confidence: 99%

Tungsten Carbide Hollow Microspheres with Robust and Stable Electrocatalytic Activity toward Hydrogen Evolution Reaction

et al. 2019

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Here, we report a stable tungsten carbide hollow microsphere (W 2 C-HS) electrocatalyst with robust electrocatalytic activity toward hydrogen evolution reaction fabricated from carburization of tungsten oxides at 700 °C with CH 4 /H 2 flow, which demands overpotentials of 153 and 264 mV to deliver 10 and 100 mA cm –2 ascribing to the hollow structures beneficial for interfacial charge transfer as well as releasing of hydrogen molecular. Meanwhile, the W 2 C-HS electrocatalyst exhibits undetectable degradation after 20 000 potential cycles indicative of extraordinary durability; in contrast, overpotential@100 mA cm –2 is dramatically increased from 128 to 251 mV after only 2000 potential cycles for benchmark platinum electrocatalyst.

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Section: Resultsmentioning

confidence: 99%

Tungsten Carbide Hollow Microspheres with Robust and Stable Electrocatalytic Activity toward Hydrogen Evolution Reaction

et al. 2019

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“…Among semiconductor oxides, tungsten oxide with various oxidation states of WO 3−x has been recognized as one of the most impressive candidate compared with other electrochromic materials due to its fast optical response time. High coloration tungsten oxide nanowires have attracted lots of attention, due to their potential in pH sensing, water splitting, gas sensors, n-type semiconductor, photocatalytic and field emission [6][7][8][9]. Hence tungsten oxide nanowires (NWs) have been synthesized by numerous synthetic approaches such as thermal evaporation, chemical vapor deposition (CVD), solvothermal route and electro spinning method for their electric or electrochemical applications [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of growth time on structural, morphological and electrical properties of tungsten oxide nanowire

et al. 2018

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In this work, tungsten oxide nanowires were grown directly on a tungsten substrate in 800 °C using thermal evaporation method in a horizontal tube furnace. The effect of growth time on structural, morphological, elemental composition and electrical properties of the tungsten oxide nanostructures was investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS) technique and KIETHLEY 2361 system. Our experimental results show that tungsten oxide nanowires crystalline phase, electrical conductance and density on the substrate surface depend on the growth time. The XRD results showed that tungsten oxide nanowires are synthesized with a cubic WO 3 structure. Moreover, the lattice strain, grain size and dislocation density were obtained in three different growth time. It is noteworthy that by increasing the growth time the crystallinity increases. The FESEM images at different growth times showed that the nanowires on grains begin to germinate when the growth time increases to 6 h. At this time, nanowire structures with 1 µm in diameter and 40 µm in length were formed and continued to grow which caused a change in the morphology. In addition, the XPS results showed that the sample that has grown at longer growth time exhibit two asymmetric W4d5/2 and W4d3/2 peak at 252 and 263 eV which can be assigned to W5+ and W4+ species, respectively. Moreover, the linear I-V curves are obtained and it is found that by increasing the growth time, the conductivity of the sample increases due to increasing number of wires on the sample surface. Finally, the conditions and mechanism of WO 3 nanowire growth are discussed. The results can be used to guide a better understanding about the growth behavior of WO 3 nanowires and can contribute towards the development of novel nanodevices.

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“…22 Moreover, it was reported that some tungstic oxides exhibited interesting electronic properties, such as high temperature superconductivity with T c at about 90 K 23 and charge carrying ability. 24 Much effort has been made to synthesize tungstic oxide nanostructures, such as nanowires, 25 26 nanorods 27 28 and nanosphere.…”

Section: Introductionmentioning

confidence: 99%

Facile and Rapid Synthesis of Pyrochlore W₂O₆·H₂O Nanoplate via a Fluorinion-Assisted Hydrothermal Process

Zheng¹,

Liang²,

Wu³

et al. 2014

j nanosci nanotechnol

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Pyrochlore W2O6 x H2O were successfully prepared via a facile and rapid hydrothermal process in the presence of fluorinion. It is worth noting that our developed method can efficiently overcome the tedious process in the preparation of nanostructured tungstic oxide in the previous reports. The as-prepared samples have been characterized by XRD, SEM and TEM. Results showed the morphologies of the samples were nanoplate and the thickness of the plate was estimated at about several nanometers. TEM image further revealed that the plates were trigonal-like with equal lengths of about 300 nm. Furthermore the selected area electron diffraction (SAED) pattern taken from a single nanoplate indicated that the nanoplates were the single crystals with a preferential growth direction along the [011] direction. The effect of the additive ions on the formation has also been discussed. It was found that the fluorinion played a key role in the formation of W2O6 x H2O nanoplates. It is hoped that our work could provide a new insight into the facile and rapid preparation of metal oxide nanomaterials.

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Catalysis on Pd/WO3 and Pd/WO2

Cited by 28 publications

References 66 publications

Tungsten Carbide Hollow Microspheres with Robust and Stable Electrocatalytic Activity toward Hydrogen Evolution Reaction

Tungsten Carbide Hollow Microspheres with Robust and Stable Electrocatalytic Activity toward Hydrogen Evolution Reaction

Effect of growth time on structural, morphological and electrical properties of tungsten oxide nanowire

Facile and Rapid Synthesis of Pyrochlore W₂O₆·H₂O Nanoplate via a Fluorinion-Assisted Hydrothermal Process

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Catalysis on Pd/WO3 and Pd/WO2

Cited by 28 publications

References 66 publications

Tungsten Carbide Hollow Microspheres with Robust and Stable Electrocatalytic Activity toward Hydrogen Evolution Reaction

Tungsten Carbide Hollow Microspheres with Robust and Stable Electrocatalytic Activity toward Hydrogen Evolution Reaction

Effect of growth time on structural, morphological and electrical properties of tungsten oxide nanowire

Facile and Rapid Synthesis of Pyrochlore W2O6·H2O Nanoplate via a Fluorinion-Assisted Hydrothermal Process

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Facile and Rapid Synthesis of Pyrochlore W₂O₆·H₂O Nanoplate via a Fluorinion-Assisted Hydrothermal Process