Palladium-decorated vanadium pentoxide as NOx gas sensor

Birajdar, Shobha N.; Adhyapak, Parag V.

doi:10.1016/j.ceramint.2020.07.223

Cited by 25 publications

(8 citation statements)

References 43 publications

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“…The 1640 and 1720 cm −1 peaks correspond to the stretching vibration of the sp 2 hybridized carbon (C=C) and the C=O of the carboxylic group, respectively. Finally, the peak around 3448 cm −1 was ascribed to the stretching vibration of the O−H group of the phenolic or alcoholic group on the activated carbon support [31] . The FTIR also showed absorption peaks around 2297 cm −1 for the 5 %Pd/V 2 O 5 ‐C series due to CO 2 sorption at the surface of those nanocomposites [32] …”

Section: Resultsmentioning

confidence: 96%

“…Finally, the peak around 3448 cm À 1 was ascribed to the stretching vibration of the OÀ H group of the phenolic or alcoholic group on the activated carbon support. [31] The FTIR also showed absorption peaks around 2297 cm À 1 for the 5 %Pd/V 2 O 5 -C series due to CO 2 sorption at the surface of those nanocomposites. [32] Raman spectrum was introduced to further confirm the phase of V 2 O 5 , functionalized activated carbon (fAC), and the Pd/V 2 O 5 -C array, Figure S1(a-c) and Figure 1(c).…”

mentioning

confidence: 90%

“…ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi ffi [37,38] The shift in the C 1s can be due to adventitious carbon, conformational changes (as also visible in XRD), and charge transfer as V 2 O 5 can induce the carbon surface affecting the electron density. Pd 3d core level spectra are depicted in Figure 4c(i, ii, iii) and the relative percentage area of the spectral weight of this core level in Tables 3-5 [39,40] As shown in Figure 4, the electronic interaction induced by the high valence state of V results in the profiles of the Pd/V 2 O 5 -C array being different from one another and having varying chemical shifts. Higher palladium oxide formation also results from V's high valence state, which promotes palladium oxidation.…”

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confidence: 99%

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Unveiling the Collaborative Strategy and Synergistic Effects of Pd/V₂O₅‐fAC towards Glycerol Electrooxidation

Matthews,

Chabalala,

Mbokazi

et al. 2023

ChemCatChem

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A series of Pd nanoparticles supported on V2O5 immobilized on functionalized carbon, %Pd (1, 3, and 5) and %V2O5 (10, 20, and 30), were prepared by sodium borohydride‐assisted microwave polyol synthesis for glycerol oxidation reaction (GlyOR) in an alkaline medium. Electrocatalysts loading, temperature, V2O5 immobilization, and their synergistic effect on the electrocatalytic performance are systematically studied. The electrocatalysts' morphology and electronic properties were investigated using X‐ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, Transmission electron microscopy, and X‐ray photoelectron spectroscopy. A significantly improved GlyOR is observed with increased V2O5 content and Pd percentage. The 5%Pd/30%V2O5–fAC showed the highest mass activity of 2157.3 mA.mg‐1Pd, a more negative onset potential of 0.62 VRHE, versus the commercial equivalent, and possessed high stability and durability. The increase in electrocatalytic activity is attributed to the effective immobilization of V2O5 on fAC efficient synergism between Pd and V2O5, strong metal support interaction (SMSI), and great exposure of the electroactive sites. The results herein contribute significantly to the understanding of the physicochemical and electrochemical effects of metal oxide immobilization, microwave irradiation, %Pd/%Metal oxide optimization, and SMSI on metal oxide‐carbon hybrid electrocatalysts for GlyOR, opening new avenues for fabricating high‐performance direct alkaline glycerol fuel cells.

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Section: Resultsmentioning

confidence: 96%

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confidence: 90%

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confidence: 99%

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Unveiling the Collaborative Strategy and Synergistic Effects of Pd/V₂O₅‐fAC towards Glycerol Electrooxidation

Matthews,

Chabalala,

Mbokazi

et al. 2023

ChemCatChem

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“…Semiconductor active layers, such as oxides, nitrides of transition metals, and carbon-containing materials, are widely used as sensor materials [ 5 ]. Despite a large number of studies, most modern semiconductor sensors have insufficient sensitivity to gaseous NO [ 6 ]. For this reason, the search for new materials with high sensitivity to gaseous NO is a very important task.…”

Section: Introductionmentioning

confidence: 99%

Cobalt and Iron Phthalocyanine Derivatives: Effect of Substituents on the Structure of Thin Films and Their Sensor Response to Nitric Oxide

et al. 2023

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In this work, we study the effect of substituents in cobalt(II) and iron(II) phthalocyanines (CoPcR4 and FePcR4 with R = H, F, Cl, tBu) on the structural features of their films, and their chemi-resistive sensor response to a low concentration of nitric oxide. For the correct interpretation of diffractograms of phthalocyanine films, structures of CoPcCl4 and FePcCl4 single crystals were determined for the first time. Films were tested as active layers for the determination of low concentrations of NO (10–1000 ppb). It was found that the best sensor response to NO was observed for the films of chlorinated derivatives MPcCl4 (M = Co, Fe), while the lowest response was in the case of MPc(tBu)4 films. FePcCl4 films exhibited the maximal response to NO, with a calculated limit of detection (LOD) of 3 ppb; the response and recovery times determined at 30 ppb of NO were 30 s and 80 s, respectively. The LOD of a CoPcCl4 film was 7 ppb. However, iron phthalocyanine films had low stability and their sensitivity to NO decreased rapidly over time, while the response of cobalt phthalocyanine films remained stable for at least several months. In order to explain the obtained regularities, quantum chemical calculations of the binding parameters between NO and phthalocyanine molecules were carried out. It was shown that the binding of NO to the side atoms of phthalocyanines occurred through van der Waals forces, and the values of the binding energies were in direct correlation with the values of the sensor response to NO.

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“…Owing to a combination of layered structure [ 1 ] with a large amount of oxygen vacancies and vanadium reactivity in redox reactions, V 2 O 5 is a very promising material for various applications, such as cathode material for various ion batteries [ 2 , 3 , 4 , 5 , 6 ], a component of antibacterial coatings [ 7 ], photocatalysts [ 8 ], electrochromic material [ 9 , 10 , 11 ], charge transfer component in photovoltaics [ 12 , 13 ], etc. In particular, V 2 O 5 is a prospective receptive layer in gas sensors for the detection of NO 2 [ 14 , 15 ], NH 3 [ 16 , 17 ], methane [ 18 ], various volatile organic compounds (VOC)—xylene [ 19 ], trimethylamine [ 20 ], etc. Among these analytes, xylene stands out as a member of the “BTEX” family of compounds—benzene, toluene, ethylbenzene, and xylene.…”

Section: Introductionmentioning

confidence: 99%

Microextrusion Printing of Hierarchically Structured Thick V2O5 Film with Independent from Humidity Sensing Response to Benzene

et al. 2022

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The process of V2O5 oxide by the combination of sol-gel technique and hydrothermal treatment using heteroligand [VO(C5H7O2)2–x(C4H9O)x] precursor was studied. Using thermal analysis, X-ray powder diffraction (XRD) and infra-red spectroscopy (IR), it was found that the resulting product was VO2(B), which after calcining at 300 °C (1 h), oxidized to orthorhombic V2O5. Scanning electron microscopy (SEM) results for V2O5 powder showed that it consisted of nanosheets (~50 nm long and ~10 nm thick) assembled in slightly spherical hierarchic structures (diameter ~200 nm). VO2 powder dispersion was used as functional ink for microextrusion printing of oxide film. After calcining the film at 300 °C (30 min), it was found that it oxidized to V2O5, with SEM and atomic force microscopy (AFM) results showing that the film structure retained the hierarchic structure of the powder. Using Kelvin probe force microscopy (KPFM), the work function value for V2O5 film in ambient conditions was calculated (4.81 eV), indicating a high amount of deficiencies in the sample. V2O5 film exhibited selective response upon sensing benzene, with response value invariable under changing humidity. Studies of the electrical conductivity of the film revealed increased resistance due to high film porosity, with conductivity activation energy being 0.26 eV.

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Palladium-decorated vanadium pentoxide as NOx gas sensor

Cited by 25 publications

References 43 publications

Unveiling the Collaborative Strategy and Synergistic Effects of Pd/V₂O₅‐fAC towards Glycerol Electrooxidation

Unveiling the Collaborative Strategy and Synergistic Effects of Pd/V₂O₅‐fAC towards Glycerol Electrooxidation

Cobalt and Iron Phthalocyanine Derivatives: Effect of Substituents on the Structure of Thin Films and Their Sensor Response to Nitric Oxide

Microextrusion Printing of Hierarchically Structured Thick V2O5 Film with Independent from Humidity Sensing Response to Benzene

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Palladium-decorated vanadium pentoxide as NOx gas sensor

Cited by 25 publications

References 43 publications

Unveiling the Collaborative Strategy and Synergistic Effects of Pd/V2O5‐fAC towards Glycerol Electrooxidation

Unveiling the Collaborative Strategy and Synergistic Effects of Pd/V2O5‐fAC towards Glycerol Electrooxidation

Cobalt and Iron Phthalocyanine Derivatives: Effect of Substituents on the Structure of Thin Films and Their Sensor Response to Nitric Oxide

Microextrusion Printing of Hierarchically Structured Thick V2O5 Film with Independent from Humidity Sensing Response to Benzene

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Unveiling the Collaborative Strategy and Synergistic Effects of Pd/V₂O₅‐fAC towards Glycerol Electrooxidation

Unveiling the Collaborative Strategy and Synergistic Effects of Pd/V₂O₅‐fAC towards Glycerol Electrooxidation