Studies on structural and optical properties of ZrO2 nanopowder for opto-electronic applications

Sathyaseelan, B.; Manikandan, E.; Baskaran, I.; Senthilnathan, K.; Sivakumar, K.; Moodley, Mathew; Ladchumananandasivam, Rasiah; Mâaza, M.

doi:10.1016/j.jallcom.2016.10.002

Cited by 97 publications

(20 citation statements)

References 25 publications

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“…These patterns are characteristic of turbostratic carbons, meaning that these lack correspondence between graphene planes [43]. Only a tiny peak (marked by an inverted triangle) was observed in the XRD pattern of AC120 at 30 • , which was confirmed to be caused by the debris of zirconia balls and bowl used for the AC milling [44]. It was clearly indicated that carbon structures of all the ACs were turbostratic, and the milling process had little impact on those carbon structures.…”

Section: Materials Properties Of the Milled Acsmentioning

confidence: 94%

Effect of Ball Milling on the Electrochemical Performance of Activated Carbon with a Very High Specific Surface Area

et al. 2020

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Activated carbon (AC) with a very high specific surface area of >3000 m2 g−1 and a number of course particles (average size: 75 µm) was pulverized by means of planetary ball milling under different conditions to find its greatest performances as the active material of an electric double-layer capacitor (EDLC) using a nonaqueous electrolyte. The variations in textural properties and particle morphology of the AC during the ball milling were investigated. The electrochemical performance (specific capacitance, rate and cyclic stabilities, and Ragone plot, both from gravimetric and volumetric viewpoints) was also evaluated for the ACs milled with different particle size distributions. A trade-off relation between the pulverization and the porosity maintenance of the AC was observed within the limited milling time. However, prolonged milling led to a degeneration of pores within the AC and a saturation of pulverization degree. The appropriate milling time provided the AC a high volumetric specific capacitance, as well as the greatest maintenance of both the gravimetric and volumetric specific capacitance. A high volumetric energy density of 6.6 Wh L−1 was attained at the high-power density of 1 kW L−1, which was a 35% increment compared with the nonmilled AC. The electrode densification (decreased interparticle gap) and the enhanced ion-transportation within the AC pores, which were attributed to the pulverization, were responsible for those excellent performances. It was also shown that excessive milling could degrade the EDLC performances because of the lowered micro- and meso-porosity and the excessive electrode densification to restrict the ion-transportation within the pores.

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Section: Materials Properties Of the Milled Acsmentioning

confidence: 94%

Effect of Ball Milling on the Electrochemical Performance of Activated Carbon with a Very High Specific Surface Area

et al. 2020

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“…ZnO showed H3-type hysteresis loop at high relative pressure. However, ZrO 2 and all ZnO-ZrO 2 composites exhibited H2-type hysteresis which is associated with the presence of bottle-shaped mesopores that can be explained as a consequence of the interconnectivity of pores [1]. The specific surface area decreased from 46 to 8 m 2 /g when 25% of ZnO was incorporated, and for 75ZnO-ZrO 2 , S BET value was 36 m 2 /g, and its N 2 isotherm showed a broader hysteresis loop than the observed pure oxides.…”

Section: Resultsmentioning

confidence: 98%

“…X-ray diffraction (XRD) patterns were obtained on a Bruker D8 Advance diffractometer using CuKα radiation (1.5418 Å) in the 2θ scan range of 10-90°. The average crystallite size of the samples was estimated using the Debye-Scherrer equation (equation (1)).…”

Section: Synthesis Of Zno-zro 2 Nanocompositesmentioning

confidence: 99%

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Synthesis and Characterization of ZnO-ZrO₂ Nanocomposites for Photocatalytic Degradation and Mineralization of Phenol

López

Lemus

Hidalgo

et al. 2019

Journal of Nanomaterials

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ZnO-ZrO2 nanocomposites using zinc (II) acetylacetonate and different ZnO contents (13, 25, 50, and 75% mol) were synthesized through sol-gel method. The synthesis process was strongly related to nanocomposite properties especially on their structural composition. The obtained ZnO-ZrO2 nanomaterials presented tetragonal crystalline structure for zirconia whereas hexagonal one was formed in ZnO. Raman spectroscopy and XRD patterns confirmed the formation of tetragonal zirconia whereas inhibition of monoclinic structure was observed. Addition of ZnO affected the pore size distribution of the composite, and the measured specific surface areas were from 10 m2/g (for pure ZnO) to 46 m2/g (pristine ZrO2). Eg values of ZrO2 were modified by ZnO addition, since calculated values using Kubelka-Munk’s function varied from 4.73 to 3.76 eV. The morphology and size of the nanomaterials investigated by electron microscopy showed formation of nanorods for ZnO with sizes ranging from 50 nm to 300 nm while zirconia was formed by smaller particles (less than 50 nm). The main advantage of using the nanocomposite for photocatalytic degradation of phenol was the mineralization degree, since 75ZnO-ZrO2 nanocomposite surpassed mineralization reached by pure ZnO and also inhibited formation of undesirable intermediates.

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“…It is known that ZrO 2 as a porous material has a relatively large surface area (ca. 80-110 m 2 /g), most of which is provided by the internal surface [68,69]. rough comparison of the detection results obtained by XPS and ICP-MS analysis (Table 2), a relatively high K content of KF/ZrO 2 detected by ICP indicated that KF is successfully distributed in both the external and internal surface of ZrO 2 .…”

Section: Catalyst Characterizationmentioning

confidence: 94%

Highly Selective Reduction of Bio-Based Furfural to Furfuryl Alcohol Catalyzed by Supported KF with Polymethylhydrosiloxane (PMHS)

et al. 2020

Journal of Chemistry

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Hydrogenation of bio-based furfural (FUR) to furfuryl alcohol (FFA) is tremendously expanding the application of biomass in many industries such as resins, biofuels, and pharmaceuticals. However, mass manufacture of FFA from FUR is restrained by strict requirements of reaction conditions and expensive catalysts. In this work, an economical and benign catalytic system, containing an easily prepared and reusable catalyst 5 wt.% KF/ZrO2 and a low-cost hydrogen source polymethylhydrosiloxane (PMHS), was developed to be efficient for the hydrogenation of FUR to high-value FFA under mild conditions. The catalyst reactivity was found to be remarkably influenced by the support acid-base properties and KF loading doge. In the presence of 5 wt.% KF/ZrO2, a high FFA yield of 97% and FUR conversion of 99% could be obtained at 25°C in just 0.5 h, which was superior to those attained with other tested catalysts. The KF/ZrO2 catalyst could be recycled at least five times, with the FFA yield slightly decreasing from 97% to 71%. The spare decrease in FFA yield is possibly attributed to the catalyst pore blocking, as clarified by SEM, BET, XPS, and ICP-MS measurements of the fresh and reused catalysts.

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Studies on structural and optical properties of ZrO2 nanopowder for opto-electronic applications

Cited by 97 publications

References 25 publications

Effect of Ball Milling on the Electrochemical Performance of Activated Carbon with a Very High Specific Surface Area

Effect of Ball Milling on the Electrochemical Performance of Activated Carbon with a Very High Specific Surface Area

Synthesis and Characterization of ZnO-ZrO₂ Nanocomposites for Photocatalytic Degradation and Mineralization of Phenol

Highly Selective Reduction of Bio-Based Furfural to Furfuryl Alcohol Catalyzed by Supported KF with Polymethylhydrosiloxane (PMHS)

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Studies on structural and optical properties of ZrO2 nanopowder for opto-electronic applications

Cited by 97 publications

References 25 publications

Effect of Ball Milling on the Electrochemical Performance of Activated Carbon with a Very High Specific Surface Area

Effect of Ball Milling on the Electrochemical Performance of Activated Carbon with a Very High Specific Surface Area

Synthesis and Characterization of ZnO-ZrO2 Nanocomposites for Photocatalytic Degradation and Mineralization of Phenol

Highly Selective Reduction of Bio-Based Furfural to Furfuryl Alcohol Catalyzed by Supported KF with Polymethylhydrosiloxane (PMHS)

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Synthesis and Characterization of ZnO-ZrO₂ Nanocomposites for Photocatalytic Degradation and Mineralization of Phenol