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Significant enhancement of stability for visible photocatalytic overall water splitting by assembling ultra-thin layer of NiO over Zn1-xCdxSX
摘要： Solar light driven water splitting into hydrogen and oxygen using visible light active photocatalyst has been considered as a clean, green, and renewable route to solar energy conversion and storage. Although Zn1-xCdxS catalyst shows comparatively higher activity for photocatalytic hydrogen generation under visible light irradiation, it suffers serious photocorrosion during the photocatalytic reaction. Deposition of protection layer over Zn1-xCdxS catalyst is believed to be an effective way to inhibit such photocorrosion. Nevertheless, seldom of protection layer exhibits satisfied catalytic properties for hydrogen evolution while presents good protection ability. In this work, a new Zn1-xCdxS photocatalyst has been developed for water splitting under visible light illumination by assembled an ultra-thin NiO layer over Zn0.8Cd0.2S via in-situ photodeposition method. By this strategy, NiO/Zn0.8Cd0.2S showed significant higher activity than Pt/Zn0.8Cd0.2S under same conditions without photocorrosion. The AQE of 0.66% for hydrogen evolution at 430 nm has been achieved and multi-cycle stability has been accomplished up to 12 hours without significant decay. Moreover, the strong electronic coupling between NiO layer and Zn1-xCdxS promoted efficient charge separation and migration.
关键词： Overall water splitting,sulfide semiconductor photocatalyst with thin NiO catalytic layer,enhanced charge separation and migration,significant enhanced stability,anti-photocorrosion
更新于2025-09-19 17:15:36
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Supercritical CO <sub/>2</sub> -assisted deposition of NiO on (101)-anatase-TiO <sub/>2</sub> for efficient facet engineered photocatalysts
摘要： NiO/(101)-anatase-TiO2 heterostructure nanoparticles were synthesized by depositing NiO onto the (101) facet of anatase crystals via the supercritical fluid chemical deposition (SFCD) route. Thorough characterization experiments performed by various techniques (XRD, UV-Vis DRS, N2 sorption, HR-TEM, EDX, and XPS) indicate that the SFCD method allowed a good dispersion of NiO onto the TiO2 nanoparticles for NiO amounts below 2 wt%. Compared to pure TiO2, the 0.1–1 wt% NiO–TiO2 nanocomposites showed enhanced photocatalytic properties for methylene blue (MB) and methyl orange (MO) decomposition under UV light irradiation, the 0.25 wt% NiO–TiO2 system leading to the highest efficiencies. The photocatalytic properties were then rationalized in terms of the acidic properties and electronic structures of the NiO–TiO2 nanocomposites. This higher photocatalytic activity was mainly related to the heterocontact at the interface of the NiO–TiO2 crystallites and to the enhanced reaction rates at the NiOx surface.
关键词： anatase-TiO2,Supercritical CO2,photocatalysis,NiO deposition,facet engineering
更新于2025-09-19 17:15:36
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AIP Conference Proceedings [AIP Publishing THE 7TH INTERNATIONAL CONFERENCE ON APPLIED SCIENCE AND TECHNOLOGY (ICAST 2019) - Karbala City, Iraq (27–28 March 2019)] THE 7TH INTERNATIONAL CONFERENCE ON APPLIED SCIENCE AND TECHNOLOGY (ICAST 2019) - Investigations of ZnO-NiO/PSi heterojunction for solar cell application
摘要： In this paper, ZnO-NiO nanocomposite has been successfully synthesized using chemical precipitation method .The structural properties were investigated using X-ray diffraction ( XRD) and field emission scanning electron microscope (FESEM) . XRD measurements confirms the formation of polycrystalline ZnO and NiO nanoparticles with a hexagonal and cubic structure respectively. The average grain size of ZnO-NiO nanocoposite estimated from FESEM was 60 nm . Heterojunction solar cell fabricated using ZnO-NiO nanocomposite on porous silicon by spray pyrolysis method shows open-circuit voltage (VOC) of 470 mV, short-circuit current density (ISC) of 39 mA/cm2, fill factor (FF) of 78.72% , and efficiency of 14.43%.
关键词： porous silicon,solar cell,chemical precipitation,ZnO-NiO nanocomposite,spray pyrolysis
更新于2025-09-19 17:13:59
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Fabrication and study of self-assembled NiO surface networks assisted by Sn doping
摘要： Complex pattering of surfaces commonly requires a significant effort in terms of time, cost, and advanced post-fabrication treatments design, which could be overcome by self-organization mechanisms avoiding damage to the surface materials and enhancing properties of interest. In the present work, grid self-assembled NiO complex surfaces have been fabricated assisted by Sn incorporation during growth, following thermal treatments at 1400 oC under a controlled Ar flow. The singular morphologies achieved enable the fabrication of robust high surface to volume ratio surfaces with a wide range of surface properties and functionalities. Based on the research performed by a set of complementary techniques, the mechanisms involved in the formation of these textured surfaces have been discussed and some of the fundamental electronic and optical properties of NiO have been analyzed, both aspects necessary to head up the potential development of applications based on this p-type material which is arousing growing attention. These singular micro- and nanostructures present high luminescence and tunable performance unusual to bulk NiO samples, which can broaden the applicability of this material to light-emitting devices. Moreover, the surface evolution depends on a controllable way on the preferential state of charge of the incorporated Sn, which could be selected through the convenient Sn-based precursor, its ratio to the metallic Ni starting precursor, and the atmosphere and duration of the fabrication treatment. Finally, in order to assess the dependence of some potential NiO-based applications on the insights achieved on the surface characterization, the gas-sensing response to ethanol from the Sn doped NiO samples was also evaluated. The study of the processes and mechanisms involved in the growth of these grid-patterned surfaces can be extended to similar oxide-based systems.
关键词： Surface-patterning,luminescence,NiO
更新于2025-09-19 17:13:59
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Tunable Q-switched ytterbium-doped fibre laser with Nickel Oxide saturable absorber
摘要： A passively Q-switched ytterbium-doped fibre laser (YDFL) using a nickel oxide-based saturable absorber is proposed and demonstrated. The Q-switched YDFL is capable of generating a stable output with a minimum pulse width of 6.9 ls and maximum repetition rate of 57.01 kHz. The generated pulses are highly stable, with an observed signal-to-noise ratio of * 33 dB. The output of the laser can be tuned over a wavelength range of 18 nm from 1035 to 1053 nm. The Q-switched YDFL would find use in multiple applications ranging from medicine to manufacturing.
关键词： Ytterbium-doped fibre laser,NiO saturable absorber,Q-switching
更新于2025-09-19 17:13:59
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Hierarchical NiO/CMK-3 Photocathode for a p-Type Dye-Sensitized Solar Cell with Improved Photoelectrochemical Performance and Fast Hole Transfer
摘要： The sluggish photoelectrochemical performance of p-type dye-sensitized solar cells (p-DSSCs) has hindered its commercial use. In this work, we introduce a novel hierarchical nanocomposite of NiO nanoparticles anchored on highly ordered mesoporous carbons CMK-3 (NiO/CMK-3). Using CMK-3 as a backbone e?ectively prevented the self-aggregation of NiO nanoparticles and subsequently increased the total speci?c surface area of the composite for more dye adsorption. The interconnected conductive networks of CMK-3 also served as a split-?ow high-speed channel, which was bene?cial for hole spin-?ow to accelerate hole transfer. The hierarchical NiO/CMK-3 photocathode improved the photovoltaic conversion e?ciency to 1.48% in a cell with a Cobalt(II)/(III) electrolyte and a PMI-6T-TPA dye.
关键词： Solar cell,CMK-3,Fast hole transport,NiO
更新于2025-09-19 17:13:59
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Synthesis of nanosheet-assembled porous NiO/ZnO microflowers through a facile one-step hydrothermal approach
摘要： The unique flower-like NiO/ZnO composite with porous nanosheets has been triumphantly manufactured via the one-step hydrothermal method initially. On the basis of morphology observations and ethanol gas measurements, it is considered that the construction of P-N junctions at the interface as well as the sheet-like porous microflowers architecture greatly contribute to the fantastic gas sensing properties of the prepared materials, which exhibit superb gas response value and outstanding repeatability. Furthermore, a possible formation mechanism is proposed, elucidating the process of the oriented-attachment, the self-assembly in addition to the pores-development.
关键词： Semiconductor,NiO/ZnO,Porous microflower,Electronic property,Functional
更新于2025-09-19 17:13:59
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Oxidized Nickel films as highly transparent HTLs for inverted planar perovskite solar cells
摘要： Inverted planar perovskite solar cells (PSCs) with nickel oxide (NiO) as a hole transporting layer were fabricated in an ambient atmosphere. Nickel (Ni) film synthesized at optimized evaporation conditions using low-cost thermal evaporation were transformed from island-like structure to compact porous thin films of NiO after oxidation at 580 ℃. The formation of highly transparent NiO films without any impurity was confirmed from UV–visible spectroscopy and energy dispersive x-ray analysis. These optically tailored NiO films with island-like morphology conceived minimum absorption to the visible light than that of compact porous thin films. The NiO island-like films coated with single cationic CH3NH3PbI3 perovskite overlayer in ambient conditions via a modified two-step method showed higher hole quenching than the compact porous NiO thin films. PSCs consisting of NiO island-like films showed 39.3% improvement in power conversion efficiency (PCE), and 41.4% enhancement in current density (JSC) compared to the compact porous NiO thin films. Overall, the present approach of utilizing optically engineered island-like inorganic films with single cationic CH3NH3PbI3 perovskite overlayer has opened up a novel approach toward the improvement in high-performance optoelectronic devices fabricated at an ambient atmosphere.
关键词： Thermal evaporation,Perovskite solar cells,Islands morphology,PL,NiO,Ambient process
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Quantum-dot light-emitting diodes with NiO and NiO:Mg as hole injection layer
摘要： Quantum-dot light-emitting diodes （QLED） have attracted great attention due to their impressive optoelectronic properties and stability. The most common used hole injection layer (HIL) material Poly(3,4-ethylenedioxytiophene):polystyrene sulfonate (PEDOT:PSS) is acidic and causes corrosion of indium-tin-oxide (ITO) anodes. Nickle oxide (NiO) are widely used as the hole transport layer (HTL) in QLED due to their suitable electrical properties. For the large energy gap between QD and HTL, there is unbalanced charge injection in QLED device when NiO is used. The energy band structures of NiO can be adjusted by Mg doping, which is an effective strategy to improve charge injection and mobility. Compared to undoped HIL, device with doped NiO give rise to higher EQE. In this work, our results suggests that Mg-doped NiO serve as a good hole injection layer materials for QLED and other optoelectronic devices.
关键词： QLED,hole injection layer,Mg-doped NiO
更新于2025-09-16 10:30:52
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Monolayer MoSe <sub/>2</sub> /NiO van der Waals heterostructures for infrared light-emitting diodes
摘要： Nowadays monolayer transition metal chalcogenides (TMCs) have been widely researched due to their excellent optoelectronic properties. However, the preparation of large-sized monolayer TMCs and high-power TMC-based light-emitting diodes are still full of challenges, which limit their application in two-dimensional devices. Here, the large-sized monolayer single-crystalline MoSe2 was synthesized by chemical vapor deposition. The influence of the relative gas pressure ratio of MoO3 to Se on MoSe2 morphology is discussed. The TEM analysis confirmed the presence of 2H-phase monolayer MoSe2. A photoluminescence peak from the MoSe2 monolayer is detected at about 804 nm, illustrating an intrinsic energy bandgap of 1.54 eV. Importantly, a novel 2D/3D heterostructure, monolayer MoSe2/NiO van der Waals heterostructure, is constructed for a light-emitting diode (LED). The electroluminescence peaks of n-MoSe2/p-NiO LED locate at 812 nm, 848 nm and 918 nm, all of which are in the infrared light range. Interestingly, the electroluminescence peaks of our n-MoSe2/p-NiO LED are close to those of conventional air conditioner telecontrollers. So the n-MoSe2/p-NiO infrared LED is forward to be used in infrared remote sensing systems in the future.
关键词： van der Waals heterostructures,infrared light-emitting diodes,Monolayer MoSe2,chemical vapor deposition,NiO
更新于2025-09-16 10:30:52