Nanocrystalline Zn1−x Ag x O y thin films evolved through electrodeposition for photoelectrochemical splitting of water

Singh, Nirupama; Choudhary, Surbhi; Upadhyay, Sumit Kumar; Satsangi, Vibha R.; Dass, Sahab; Shrivastav, Rohit

doi:10.1007/s10008-013-2285-y

Cited by 12 publications

(4 citation statements)

References 33 publications

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“…(0.74 Å ). Hence, the insertion of both these metals in the interstitial space is expected to build compressive strain in the lattice, as is also observed in this study [25].…”

Section: Microstructural Characteristics: Xrd Analysismentioning

confidence: 62%

“…The method permits deposition of high-purity metal nanoparticles on substrates of varying sizes and shapes, with greater control over the density [22]. In continuation to our previous reports on PEC splitting of water, using nanostructured undoped/doped metal oxides, the present work is an endeavor to enhance the PEC performance of [23][24][25][26][27][28]. The study deals with the surface deposition of silver (Ag)/gold (Au) nano-isles, on ZnO thin films, which was carried out at fixed potentials, for time duration ranging 5-60 s. The sample films were characterized by X-ray diffractometry (XRD), UV-Visible spectrometry, scanning electron microscopy (SEM), and atomic force microscopy (AFM).…”

Section: Introductionmentioning

confidence: 77%

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Surface deposition of Ag and Au nano-isles on ZnO thin films yields enhanced photoelectrochemical splitting of water

et al. 2015

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Nanostructured zinc oxide thin films, prepared by sol-gel, were subjected to surface loading of silver/gold nano-isles by controlled electrodeposition, using aqueous solutions (10 -2 M) of silver nitrate and chloroauric acid as precursor. The deposition potentials were, respectively, -400 and -200 mV for silver and gold depositions, as the deposition time varied from 5 to 60 s. Pristine samples (i.e., samples with no deposition of metal nano-isles) were also obtained for comparison. X-ray diffractometry indicated dominant evolution of wurtzite zinc oxide phase, with a possible diffusion of silver/gold into zinc oxide lattice. However, changes in the band gap energy were insignificant. Atomic force microscopic and scanning electron microscopic analyses revealed the surface topography and morphology. Energy-dispersive X-ray analysis confirmed the elemental stoichiometry and existence of silver and gold nanoparticles in films. Samples exhibited significant gain in photoelectrochemical water splitting current, which is largely attributable to the facilitative role played by silver/gold nano-isles in the separation and transport of photogenerated charge-carriers.

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“…(0.74 Å ). Hence, the insertion of both these metals in the interstitial space is expected to build compressive strain in the lattice, as is also observed in this study [25].…”

Section: Microstructural Characteristics: Xrd Analysismentioning

confidence: 62%

Section: Introductionmentioning

confidence: 77%

Surface deposition of Ag and Au nano-isles on ZnO thin films yields enhanced photoelectrochemical splitting of water

et al. 2015

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“…Recently, one type of technologies based on photoelectrochemical (PEC) reactions is expected as a potential route to solve the problems [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. These technologies share some features in common, including utilization of nanostructured or molecular semiconductors to harvest sunlight, and conversion of solar energy into fuels or electricity by electrochemical reactions, etc.…”

Section: Introductionmentioning

confidence: 99%

“…These technologies share some features in common, including utilization of nanostructured or molecular semiconductors to harvest sunlight, and conversion of solar energy into fuels or electricity by electrochemical reactions, etc. For instance, hydrogen (H 2 ), regarded as one of the most promising candidates to fossil fuels, could be produced by photocatalytic water (H 2 O) splitting [3,[5][6][7][15][16][17]. Photocatalytic degradation of organic pollutants is a feasible and cost-effective way to address the environmental problem [1,2,9,10].…”

Section: Introductionmentioning

confidence: 99%

Sonication-polished anodic TiO2 nanotube array-based photoanode for efficient solar energy conversion

Zhong

Guo

et al. 2016

J Solid State Electrochem

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In this work, the capping layer atop anodic TiO 2 nanotube arrays (NTAs), which hinders filling of other guest materials and transport of charge carriers, is discerned to be TiO 2 nanotapes. Then, it is completely removed by a novel sonication-polishing (SP) treatment, after which Sb 2 S 3 is subsequently introduced to fill the nanotubes by chemical bath deposition. The morphological, structural, and optical properties of the SP-treated TiO 2 NTAs and TiO 2 NTAs/Sb 2 S 3 heterogeneous structures are characterized systematically. The results indicate that SP treatment opens the tops of nanotubes with diameters of ∼120 nm, which endure a phase conversion from amorphous to anatase after calcination at 450°C; besides, stibnite Sb 2 S 3 with a band gap of ∼1.75 eV inside the TiO 2 networks is formed upon heat treatment at 330°C in Ar, which enhances the absorption in visible light range. The photoelectrochemical (PEC) and photovoltaic properties for the SP-treated TiO 2 NTAs are investigated. Results shows that the photoresponse of TiO 2 NTAs is improved by the SP treatment, and the photocurrent for the TiO 2 NTAs/Sb 2 S 3 electrode is substantially enhanced as compared to the bare TiO 2 one. A high efficiency of 6.28 % is achieved in a TiO 2 NTAs/Sb 2 S 3 PEC cell. In addition, charge recombination in the photoanode of dye-sensitized solar cells (DSSCs) is observed to be greatly retarded by using the SP-treated TiO 2 NTAs as compared to TiO 2 nanoparticles (NPs). Thus, the SP anodic TiO 2 NTAs are promising in applications in various PEC areas such as photocatalysis and sensitized solar cells.

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Chemically etched ZnO thin films, with surface-evolved nano-ridges, for efficient photoelectrochemical splitting of water

Kumari

Sharma

Singh

et al. 2015

J Solid State Electrochem

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Nanocrystalline Zn1−x Ag x O y thin films evolved through electrodeposition for photoelectrochemical splitting of water

Cited by 12 publications

References 33 publications

Surface deposition of Ag and Au nano-isles on ZnO thin films yields enhanced photoelectrochemical splitting of water

Surface deposition of Ag and Au nano-isles on ZnO thin films yields enhanced photoelectrochemical splitting of water

Sonication-polished anodic TiO2 nanotube array-based photoanode for efficient solar energy conversion

Chemically etched ZnO thin films, with surface-evolved nano-ridges, for efficient photoelectrochemical splitting of water

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