Functional Materials Letters
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2019
·
IF 1.388
Qizhi Tian,Yajun Ji
In this paper, novel chestnut-like TiO 2 was successfully synthesized by the hydrothermal method. The presence of chestnut-like structure not only increased the density of active sites with a high accessibility, but also facilitated the diffusion of solvent and products. Then, the chestnut-like TiO 2 based thin films on FTO were successfully prepared by the doctor-blade method. Moreover, the thickness of thin films can be adjusted via different repeated times. After that, in order to further improve its photoelectric properties, the adoption of CdS sensitization with different time interval via chemical bath route was studied. Photoelectrochemical (PEC) measurements showed that CdS/TiO 2 photoelectrode under the optimal condition exhibited minimal resistance and the fastest charge transfer rate. The highest photocurrent density can reach 35.1 μ A ⋅ cm − 2 , which is almost 5-fold than that of pure chestnut-like TiO 2 (7.6 μ A ⋅ cm − 2 ) based thin films. The enhanced PEC properties could be ascribed to the improvement of light harvesting and the formation of heterostructure to accelerate the separation of photo-generated electron-hole pairs.
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ACS Omega
·
2019
·
IF 2.584
Lian Hu,Tianning Xu,Huaxin Zhu,Chaoqun Ma,Guoqing Chen
Enhanced luminescence of an emitter on a Ag film is usually ascribed to the resonant surface plasmons. In these studies, the solid cadmium sulfide (CdS) and cadmium selenide (CdSe) quantum dot/silver (QD/Ag) hybrids were prepared, and the luminescence characteristics of these QD/Ag hybrids were measured. It is found that the enhancement of the trap state emission (TSE) is related to the QD size. The TSE features of the annealed QD/Ag hybrids are insensitive to the morphology of the Ag film. We used the wet and dry methods to separate the QD and Ag components and found that the photoluminescence (PL) of the QD component was permanently changed from the initial state. The PL modification is ascribed to the Ag+ doping effect rather than the surface plasmons. This doping method uses pure Ag as the Ag+ ion source. In this case, though the CdS and CdSe QD/Ag hybrids are the solid state, the cation exchange between Ag+ and Cd2+ ions can still occur on the QD surface. Even a small amount of Ag can efficiently influence the luminescence of the QDs embedded in the poly(methyl methacrylate) matrix. A hypothetical model was proposed to explain the PL modification of the QD/Ag hybrid with and without annealing. Using this dry method for doping, the transparent luminescence label can be prepared easily, and the doped QDs can be further doped with Ag+ dopants.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Jimin Du,Huiming Wang,Mengke Yang,Fangfang Zhang,Haoran Wu,Xuechun Cheng,Sijie Yuan,Bing Zhang,Kaidi Li,Yina Wang,Hyoyoung Lee
Efficient production of hydrogen through visible-light-driven water splitting mechanism using semiconductor-based composites has been identified as a promising strategy for converting light into clean H 2 fuel. However, researchers are facing lots of challenges such as light absorption and electron-hole pair recombination and so on. Here, new sheet-shaped MoS 2 and pyramid-shaped CdS in-situ co-grown on porous TiO 2 photocatalysts (MoS 2 CdS TiO 2 ) are successfully obtained via mild sulfuration of MoO 3 and CdO coexisted inside porous TiO 2 monolith by a hydrothermal route. The scanning electron microscopy and transmission electron microscopy results exhibit that the MoS 2 CdS TiO 2 composites have average pore size about 500 nm. The 3%MoS 2 10%CdS TiO 2 demonstrated excellent photocatalytic activity and high stability for a hydrogen production with a high H 2 -generation rate of 4146 μmol h −1 g −1 under visible light irradiation even without noble-metal co-catalysts. The super photocatalytic performance of the visible-light-driven hydrogen evolution is predominantly attributed to the synergistic effect . The conduction band of MoS 2 facilitates in transporting excited electrons from visible-light on CdS to the porous TiO 2 for catalytic hydrogen production, and holes to MoS 2 for inhibiting the photocorrosion of CdS, respectively, leading to enhancing the efficient separation of electrons and holes.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Meng Yuan,Wen-Hui Zhou,Dong-Xing Kou,Zheng-Ji Zhou,Yue-Na Meng,Si-Xin Wu
Design and preparation of high performance photocatalysts are always the keys for photocatalytic hydrogen production by using green and unlimited solar energy. In this work, we present the synthesis of Cu 2 ZnSnS 4 (CZTS) decorated CdS nanorods and their use for visible-light-driven photocatalytic hydrogen production. The as-synthesized CZTS decorated CdS nanorods exhibit much higher visible-light-driven photocatalytic hydrogen production performance than that of individual CdS nanorods and individual CZTS nanoparticles . Specifically, the hydrogen production rate of representative CZTS decorated CdS nanorods was 48-times and 165-times higher than that of individual CdS nanorods and individual CZTS nanoparticles. The enhanced photocatalytic hydrogen production performance may be contributed by the p-n heterojunction as well as the synergistic effect between CdS nanorods and CZTS particles. The present work not only reported new low-cost and highly efficient photocatalysts for visible-light-driven photocatalytic hydrogen production, but also provided new method for the design and preparation of high performance visible-light-driven heterostructured photocatalysts for photocatalytic hydrogen production.
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RSC Advances
·
2018
·Vol. 8
·期 61
·35306-35313
·
IF 2.936
Pengpeng Feng,Yusong Pan,Hui Ye
NaYF4:Yb,Tm upconversion nanocrystals with hexagonal structure possess excellent photoluminescence emission characteristics. Under near infrared (NIR) light irradiation, the Yb3+ ions act as sensitizers to absorb the NIR light and transform NIR light into ultraviolet (UV) and visible (Vis) light continuously. Hybrid NIR-activated photocatalysts can be fabricated by combining upconversion nanocrystals with various semiconductor nanocrystals. In this paper, NaYF4:Yb,Tm micro-rods were hydrothermally synthesized with oleic acid as capping ligand. The NaYF4:Yb,Tm@CdS composite was fabricated by in situ generation of CdS nanoclusters on the surface of NaYF4:Yb,Tm micro-rods. The morphologies and structures of NaY4:Yb,Tm and NaYF4:Yb,Tm@CdS were characterized by XRD, SEM, TEM, XPS, UV-Vis and PL spectroscopy. The results of photocatalytic experiments indicated that the NaYF4:Yb,Tm@CdS composite displayed photocatalytic activity under NIR irradiation. In comparison with pure CdS, the photocatalytic ability of NaYF4:Yb,Tm@CdS composite under Vis-NIR irradiation was obviously enhanced. 82% of RhB was degraded by NaYF4:Yb,Tm@CdS catalyst within 75 min under Vis-NIR irradiation, which was more effective than pure CdS (65% degradation of RhB).
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SUPERLATTICES AND MICROSTRUCTURES
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2018
·
IF 2.099
Tianjiao Huang,Xiaoshan Zhang,Huan Wang,Xueting Chen,Lingling Wen,Meixin Huang,Yangshuai Zhong,Hui Luo,Guo Tang,Liya Zhou
In this paper, we developed a simple and convenient method for incorporating graphene with anatase-rutile TiO 2 composite and applied it as photoanode to improve the photovoltaic performance of CdS QDSSCs. Our research indicated in a CdS QDSSC system, the photoelectric conversion efficiency (PCE) of anatase-rutile TiO 2 (TGr0) composite photoanode was 86% higher than that rutile TiO 2 NRs. We also found that the PCE increased first and then decreased with the change of graphene content after the graphene was introduced into the anatase-rutile TiO 2 photoanode. When the ratio of optimized graphene/anatase TiO 2 particles composite that spin-coated on rutile TiO 2 NRs photoanode was 5%, we attained a maximum PCE of 2.20%, which was 178% and 50% higher than that pure TiO 2 NRs (0.79%) and TGr0 (1.47%), respectively.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2015
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IF 3.368
Xin Li,Xiang Chen,Hao Niu,Xiao Han,Ting Zhang,Jiuyu Liu,Huiming Lin,Fengyu Qu
In this paper, CdS/TiO 2 heteronanofibers have been prepared for the photocatalysis toward organic dyes under visible irradiation. Firstly, the one dimensional (1D) TiO 2 porous nanofibers (50–100) nm in diameter and several micrometers in length were synthesized by electrospinning and then CdS nanopaticles (50–100 nm in size) successfully grown onto TiO 2 fibers to form the heterostructure . These CdS/TiO 2 heteronanofibers were adopted as photocatalyst and the photocatalsis processes were analyzed in detail, showing the enhanced visible photodecomposition and good recycle ability. Furthermore, the degradation kinetics was further investigated by varying the amount of CdS. The increase of CdS component may enhance the degradation rate under visible light , but the total degradation efficiency also is affected by the adsorption capacity of catalyst toward the dyes. With the improved visible light degradation performance, these CdS/TiO 2 heteronanofibers would be expected to be used in water purification .
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BIOSENSORS & BIOELECTRONICS
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2014
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IF 6.451
Li Shangguan,Wei Zhu,Yanchun Xue,Songqin Liu
A photoelectrochemical (PEC) aptasensor for highly sensitive and specific detection of thrombin was developed by using graphene–CdS nanocomposites multilayer as photoactive species and electroactive mediator hexaammineruthenium(III) chloride ( Ru NH 3 6 3 + ) as signal enhancer. Graphene–CdS nanocomposites (G–CdS) were synthesized by one-pot reduction of oxide graphene and CdCl 2 with thioacetamide . The photoactive multilayer was prepared by alternative assembly of the negatively charged 3-mercaptopropionic acid modified graphene–CdS nanocomposites (MPA-G–CdS) and the positively charged polyethylenimine (PEI) on ITO electrode. This layer-by-layer assembly method enhanced the stability and homogeneity of the photocurrent readout of G–CdS. Thrombin aptamer was covalently bound to the multilayer by using glutaraldehyde as cross-linking. Electroactive mediator Ru NH 3 6 3 + could interact with the DNA phosphate backbone and thus facilitated the electron transfer between G–CdS multilayer and electrode and enhanced the photocurrent. Hybridizing of a long complementary DNA with thrombin aptamer could increase the adsorption amount of Ru NH 3 6 3 + , which in turn boosted the signal readout. In the presence of target thrombin, the affinity interaction between thrombin and its aptamer resulted in the long complementary DNA releasing from the G–CdS multilayer and decreasing of photocurrent signal. On the basis of G–CdS multilayer as the photoactive species, Ru NH 3 6 3 + as an electroactive mediator, and aptamer as a recognition module, a high sensitive PEC aptasensor for thrombin detection was proposed. The thrombin aptasensor displayed a linear range from 2.0 pM to 600.0 pM and a detection limit of 1.0 pM. The present strategy provided a promising ideology for the future development of PEC biosensor.
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RSC Advances
·
2014
·Vol. 4
·期 69
·36665-36670
·
IF 3.708
Juan Feng,Junxue Liu,Guijuan Wei,Jun Zhang,Shutao Wang,Zhaojie Wang,Changhua An
Hollow CdS nanostructures have been synthesized by a two-step ionic exchange route, which consists of a first synthesis of Ag2S intermediated hollow frames derived from the reaction of S2− ions with AgCl cube-tetrapods, and a subsequent ion-exchange conversion of the obtained Ag2S to CdS hollow nanoframes. The investigation of the corresponding transformation process with scanning electronic microscopy (SEM) revealed that the obtained CdS particles preserved the framework of the original template. The solar-driven hollow structured CdS modified with 5% (w/w) of promoter of Pt nanoparticles/nanoclusters manifested a high hydrogen evolution rate of 10.07 mmol h−1 g−1, corresponding to the apparent quantum yield of 9.6% measured at a single length of 435 nm, which is due to efficient charge separation, fast transport of the photogenerated carriers, and fast photochemical reaction at the CdS/Pt/electrolyte interfaces. The present work can benefit the development of other hollow structured nano-photocatalysts with high efficiency towards new energy applications.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2015
·Vol. 27
·期 2
·1479-1484
·
IF 1.569
Li Jing,Cao Jun,Zhang Xiufang,Wang Song,Zheng Yingying,Pan Jiaqi,Li Chaorong
The ZnO/CdS nanocomposites have been successfully synthesized on the electrospun cotton cellulose nanofibers (CCNFs). ZnO nanorods (70–80 nm in diameter and 1 μm in length) are uniformly grown on the CCNFs by a simple hydrothermal method firstly and then different amount of CdS nanoparticles (20–30 nm in diameter) are loaded on the ZnO nanorods by the chemical bath deposition method. The visible light photocatalytic activity of ZnO/CdS nanocomposites is investigated by degradation of Rhodamine B under visible light irradiation, and it demonstrates that the photocatalytic performance of this composites is significantly enhanced compared with that of pure ZnO. Furthermore, the relatively narrow band gap and novel nanostructure of the composites are considered as the main reasons of this enhancement.
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OPTICS COMMUNICATIONS
·
2015
·
IF 1.449
Yibing Lin,Yu Lin,Yongming Meng,Yongguang Tu,Xiaolong Zhang
SnO 2 nanoparticles were synthesized by hydrothermal method and applied to photo-electrodes of quantum dots-sensitized solar cells (QDSSCs). After sensitizing SnO 2 films via CdS quantum dots , CdSe quantum dots was decorated on the surface of CdS/SnO 2 photo-electrodes to further improve the power conversion efficiency. CdS and CdSe quantum dots were deposited by successive ionic layer absorption and reaction method (SILAR) and chemical bath deposition method (CBD) respectively. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) were used to identify the surface profile and crystal structure of SnO 2 photo-electrodes before and after deposited quantum dots. After CdSe co-sensitized process, an overall power conversion efficiency of 1.78% was obtained in CdSe/CdS/SnO 2 QDSSC, which showed 66.4% improvement than that of CdS/SnO 2 QDSSC.
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CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Juan Feng,Changhua An,Linxiu Dai,Junxue Liu,Guijuan Wei,Song Bai,Jun Zhang,Yujie Xiong
To seek robust active photocatalysts for sunlight-driven water splitting, a variety of semiconductor materials have been developed to achieve high photocatalytic efficiency. In this work, the CdS nanoplates with rough surface have been synthesized through a two-step ionic-exchange route. The as-synthesized sample was modified by Pt in an in situ photo-deposition cell to fabricate hybrid Pt/CdS nanophotocatalyst. The rate of average solar hydrogen evolution over the Pt/CdS nanoplates reached 3.75 mmol h −1 g −1 , which is significantly higher than that of bare CdS and NiS/CdS counterparts. Furthermore, the Pt/CdS exhibited very high stability in continuous solar H 2 evolution at a relatively stable state even over a 16-day reaction period, implying the as-fabricated hybrid nanophotocatalyst is approaching the practical requirements. The significantly enhanced photocatalytic efficiency was ascribed to the merits of rough plate-like nanostructures and the assistance of Pt co-catalyst, which can promote the light-absorption capability and photo-carrier separation as well as provide reactive sites. The present work opens an avenue to construct efficient and stable solar-driven catalysts for new energy creation.
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