Hierarchical Heterostructure of ZnO@TiO2 Hollow Spheres for Highly Efficient Photocatalytic Hydrogen Evolution

Li, Yue; Wang, Longlu; Liang, Jian; Gao, Fengxian; Yin, Kai; Dai, Peng

doi:10.1186/s11671-017-2304-5

Cited by 36 publications

(17 citation statements)

References 29 publications

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“…Many methods have been developed to synthesize ZnO nanoparticles with different sizes and morphologies, including chemical vapor deposition [ 11 ], sol-gel methods [ 12 ], hydrothermal methods [ 13 ], laser ablation [ 14 ], microemulsion techniques [ 15 ], and others [ 16 ]. Due to their large specific surface areas as well as high surface energies, ZnO nanoparticles tend to agglomerate easily.…”

Section: Introductionmentioning

confidence: 99%

A Facile Approach for the Preparation of Nano-size Zinc Oxide in Water/Glycerol with Extremely Concentrated Zinc Sources

Wang

Fang-hua

et al. 2018

Nanoscale Res Lett

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A facile process to prepare zinc oxide (ZnO) nanoparticles from an aqueous zinc chloride (ZnCl2) solution and an aqueous hydroxide solution under a glycerol stabilizer at room temperature was developed. ZnCl2 aqueous solutions as concentrated as 65–80 wt% were used as the concentrated zinc source. The concentration of ZnCl2 solutions and the molar ratio of glycerol to Zn2+ had obvious effects on the sizes and shapes of the ZnO nanoparticles. The shape of ZnO nanoparticles changed from rods approximately 50–120 nm long and 30–70 nm in diameter to globular with diameters of approximately 20 nm with the increasing of the concentration of the ZnCl2 solution and the mole ratio of glycerol to Zn2+. Glycerol, as a stabilizer, played an important role in the formation of ZnO nanostructures at room temperature, even for a highly concentrated zinc source.

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Section: Introductionmentioning

confidence: 99%

A Facile Approach for the Preparation of Nano-size Zinc Oxide in Water/Glycerol with Extremely Concentrated Zinc Sources

Wang

Fang-hua

et al. 2018

Nanoscale Res Lett

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“…Since the pioneering work from Fujishima and Honda to induce the photo-assisted decomposition of water into H 2 by using UV light in 1972, the photocatalytic properties of semiconductors have been studied in detail to directly convert solar energy into solar fuels [ 1 , 2 , 3 ]. Metal oxide semiconductors, such as TiO 2 [ 4 ], WO 3 [ 5 ], ZrO 2 [ 6 ], SnO 2 [ 7 ], CeO 2 [ 8 ], ZnO [ 9 ], have been utilized as promising photo-catalyzers to generate H 2 [ 10 ]. Among them, ZnO is nontoxic, low-cost and eco-friendly, and has been investigated for photoactivity [ 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ZnO/Red Phosphorus Heterostructure for Effective Photocatalytic H2 Evolution from Water Splitting

et al. 2018

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Photocatalysis is a green technique that can convert solar energy to chemical energy, especially in H2 production from water splitting. In this study, ZnO and red phosphorus (ZnO/RP) heterostructures were fabricated through a facile calcination method for the first time, which showed the considerable photocatalytic activity of H2 evolution. The photocatalytic activities of heterostructures with different ratios of RP have been investigated in detail. Compared to bare ZnO, ZnO/RP heterostructures exhibit a 20.8-fold enhancement for H2 production and furthermore overcome the photocorrosion issue of ZnO. The improved photocatalytic activities highly depend on the synergistic effect of the high migration efficiency of photo-induced electron–hole pairs with the inhibited charge carrier recombination on the surface. The presented strategy can also be applied to other semiconductors for various optoelectronics applications.

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“…Among the various non-noble co-catalysts including carbon family (graphene, carbon nanotubes, reduced grapheme oxide, carbon nanodots) [ 10 – 15 ], phosphides [ 16 – 22 ], and TiO 2 [ 23 , 24 ] and sulfides [ 25 – 32 ], Ni 2 P and CoP have been extensively composited with CdS nanowires and/or nanorods for efficient photocatalytic H 2 production [ 16 – 18 , 33 – 36 ]. In these composites, one-dimensional (1D) CdS was always decorated by smaller phosphides’ nanoparticles or nanosheets with HER activity, and carrier recombinations can be greatly reduced because of the long carrier diffusion length of the 1D structure and its well-defined hetero-interface with the co-catalysts.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Hydrogen Evolution by Loading Cd0.5Zn0.5S QDs onto Ni2P Porous Nanosheets

et al. 2018

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Ni2P has been decorated on CdS nanowires or nanorods for efficient photocatalytic H2 production, whereas the specific surface area remains limited because of the large size. Here, the composites of Cd0.5Zn0.5S quantum dots (QDs) on thin Ni2P porous nanosheets with high specific surface area were constructed for noble metal-free photocatalytic H2 generation. The porous Ni2P nanosheets, which were formed by the interconnection of 15–30 nm-sized Ni2P nanoparticles, allowed the uniform loading of 7 nm-sized Cd0.5Zn0.5S QDs and the loading density being controllable. By tuning the content of Ni2P, H2 generation rates of 43.3 μM h− 1 (1 mg photocatalyst) and 700 μM h− 1 (100 mg photocatalyst) and a solar to hydrogen efficiency of 1.5% were achieved for the Ni2P-Cd0.5Zn0.5S composites. The effect of Ni2P content on the light absorption, photoluminescence, and electrochemical property of the composite was systematically studied. Together with the band structure calculation based on density functional theory, the promotion of Ni2P in charge transfer and HER activity together with the shading effect on light absorption were revealed. Such a strategy can be applied to other photocatalysts toward efficient solar hydrogen generation.

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Hierarchical Heterostructure of ZnO@TiO2 Hollow Spheres for Highly Efficient Photocatalytic Hydrogen Evolution

Cited by 36 publications

References 29 publications

A Facile Approach for the Preparation of Nano-size Zinc Oxide in Water/Glycerol with Extremely Concentrated Zinc Sources

A Facile Approach for the Preparation of Nano-size Zinc Oxide in Water/Glycerol with Extremely Concentrated Zinc Sources

Fabrication of ZnO/Red Phosphorus Heterostructure for Effective Photocatalytic H2 Evolution from Water Splitting

Enhanced Photocatalytic Hydrogen Evolution by Loading Cd0.5Zn0.5S QDs onto Ni2P Porous Nanosheets

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