In situ preparation of N doped orthorhombic Nb2O5 nanoplates /rGO composites for photocatalytic hydrogen generation under sunlight

Kulkarni, Aniruddha K.; Panmand, Rajendra P.; Sethi, Yogesh A.; Kadam, Sunil R.; Tekale, Shashikant P.; Baeg, G.-H.; Ghule, Anil V.; Kale, Bharat B.

doi:10.1016/j.ijhydene.2018.09.013

Cited by 39 publications

(17 citation statements)

References 88 publications

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“…The transition metal oxide semiconductor catalyst such as ZnO and TiO 2 reported for best photocatalytic activity. Along with ZnO and TiO 2 some other oxide catalyst such as SnO 2 4 , Ta 2 O 5 5 , Nb 2 O 5 6 , Co 3 O 4 7 , WO 3 8 , V 2 O 5 9 , MoO 3 10 , Bi 2 MoO 4 11 , and CdMoO 4 also reported 12 . But these materials have wide band gap (>3.0 eV) and show good activity only under UV light which is only 5% of the solar spectrum and did not show good photocatalytic activity in the visible light 13 .…”

Section: Introductionmentioning

confidence: 99%

Unique CdS@MoS2 Core Shell Heterostructure for Efficient Hydrogen Generation Under Natural Sunlight

Kadam

Gosavi

Kale

et al. 2019

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The hierarchical nanostructured CdS@MoS 2 core shell was architectured using template free facile solvothermal technique. More significantly, the typical hexagonal phase of core CdS and shell MoS 2 has been obtained. Optical study clearly shows the two steps absorption in the visible region having band gap of 2.4 eV for CdS and 1.77 eV for MoS 2 . The FESEM of CdS@MoS 2 reveals the formation of CdS microsphere (as a core) assemled with 40–50 nm nanoparticles and covered with ultrathin nanosheets of MoS 2 (Shell) having size 200–300 nm and the 10–20 nm in thickness. The overall size of the core shell structure is around 8 µm. Intially, there is a formation of CdS microsphre due to high affinity of Cd ions with sulfur and further growth of MoS 2 thin sheets on the surface. Considering band gap ideally in visible region, photocatalytic hydrogen evolution using CdS@MoS 2 core shell was investigated under natural sunlight. The utmost hydrogen evolution rate achieved for core shell is 416.4 µmole h −1 with apparent quantum yield 35.04%. The photocatalytic activity suggest that an intimate interface contact, extended visible light absorption and effective photo generated charge carrier separation contributed to the photocatalytic enhancement of the CdS@MoS 2 core shell. Additional, the enhanced hole trapping process and effective electrons transfer from CdS to MoS 2 in CdS@MoS 2 core shell heterostructures can significantly contribute for photocatalytic activity. Such core shell heterostructure will also have potential in thin film solar cell and other microelectronic devices.

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Section: Introductionmentioning

confidence: 99%

Unique CdS@MoS2 Core Shell Heterostructure for Efficient Hydrogen Generation Under Natural Sunlight

Kadam

Gosavi

Kale

et al. 2019

Sci Rep

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“…The photogenerated holes from VB oxidize methanol and get adsorbed on the surface of the semiconductor, producing protons (H + ) and free radicals, while the electrons from CB reduce H + ions into molecular hydrogen. 51 Semiconductor ! hn e À þ h þ…”

Section: Photocatalytic Study: Photocatalytic Activity Measurementsmentioning

confidence: 99%

Plasmonic Ag decorated CdMoO₄ as an efficient photocatalyst for solar hydrogen production

et al. 2019

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“…However, numerous other semiconductor oxides can also be used for this technology [8,10,12]. Niobium pentoxide (Nb 2 O 5 ) is a semiconductor that has interesting optical and electrical properties and can be applied in different research fields, such as DSSC, photocatalysis, and sensors [3,[13][14][15][16][17][18][19][20]. Nb 2 O 5 is an n-type semiconductor with a larger conduction band edge and a wide bandgap [4,8,12].…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Multi-Photonic behavior of Nb2O5 and its correlation with synthetic methods

et al. 2021

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The performance of niobium pentoxide (Nb 2 O 5 ) as photoanodes in dye-sensitized solar cells (DSSCs) and as catalysts in the photocatalytic degradation of Rhodamine B (RhB) was investigated. Four samples of Nb 2 O 5 (Nb 2 O 5 _SG, Nb 2 O 5 _CR, Nb 2 O 5 _PP, and Nb 2 O 5 _MA) were synthesized by four different methods, respectively, entailing the sol-gel, combustion, polymeric precursors, and a microwave-assisted hydrothermal reaction. In all these samples, the orthorhombic phase of Nb 2 O 5 was obtained, which resulted in different shapes and assemblies, which is very relevant because the surface area, shape, and size distribution of the nanoparticles significantly contribute to the optical process. The bandgap remained constant at 3.0 eV for all the samples, even for the sample prepared by the combustion method. An additional phase, which is related to local distortions, was revealed by Raman spectroscopy within the vibration range of 688-260 cm -1 . DSSCs using photoanodes with smaller and more dispersed Nb 2 O 5 particles showed better results than those with inhomogeneities. For comparison, DSSCs were assembled using two different counter electrodes, platinum and graphite. The DSSC with platinum showed better photovoltaic results, mainly with photocurrents from 1.17 mA.cm -2 for Nb 2 O 5 _CR to 1.64 mA.cm -2 for Nb 2 O 5 _SG. The same trend was observed for the photocatalytic degradation of RhB, where the smaller and dispersed particles of Nb 2 O 5 _CR and Nb 2 O 5 _SG exhibited the best performance and, respectively, degraded approximately 75% and 61% of the RhB dye over 180 min. Therefore, the results of this study established a correlation between the synthesis methods and photonic behavior.

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In situ preparation of N doped orthorhombic Nb2O5 nanoplates /rGO composites for photocatalytic hydrogen generation under sunlight

Cited by 39 publications

References 88 publications

Unique CdS@MoS2 Core Shell Heterostructure for Efficient Hydrogen Generation Under Natural Sunlight

Unique CdS@MoS2 Core Shell Heterostructure for Efficient Hydrogen Generation Under Natural Sunlight

Plasmonic Ag decorated CdMoO₄ as an efficient photocatalyst for solar hydrogen production

Multi-Photonic behavior of Nb2O5 and its correlation with synthetic methods

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In situ preparation of N doped orthorhombic Nb2O5 nanoplates /rGO composites for photocatalytic hydrogen generation under sunlight

Cited by 39 publications

References 88 publications

Unique CdS@MoS2 Core Shell Heterostructure for Efficient Hydrogen Generation Under Natural Sunlight

Unique CdS@MoS2 Core Shell Heterostructure for Efficient Hydrogen Generation Under Natural Sunlight

Plasmonic Ag decorated CdMoO4 as an efficient photocatalyst for solar hydrogen production

Multi-Photonic behavior of Nb2O5 and its correlation with synthetic methods

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Plasmonic Ag decorated CdMoO₄ as an efficient photocatalyst for solar hydrogen production