INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
·
IF 4.784
Dandan Hao,Quanhao Shen,Ju Liu,Lingfei Wei,Rehana Bibi,Bo Fu,Naixu Li,Jiancheng Zhou
In the present work, CdS nanoparticles were integrated into sodium alginate aerogel matrix through a facile method. The CdS particles were successfully incorporated into the network of sodium alginate and highly distributed. Moreover, the accessibility of pore structures of sodium alginate was well-preserved. The resulting hybrid aerogels demonstrated high photocatalytic ability towards Cr (VI) reduction. SA/CdS-2 (mass ratio SA: CdS = 1:2) exhibited the highest reduction efficiency of Cr (VI), which could reduce the concentration of Cr (VI) to 0 mg/L after 60 min illumination. A probably adsorption-photoreduction mechanism was proposed and discussed in detail. The aerogels had excellent reusability and recyclability, avoiding secondary pollution. This work holds a promise to design and fabrication of CdS particles into three-dimensional aerogel network.
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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 12
·4015-4025
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IF 4.052
Haiyu Wang,Zhiliang Jin,Xuqiang Hao
The development of a highly active and stable non-noble-metal hydrogen-producing catalyst for renewable energy reserves and conversion remains a serious challenge. In this work, we described a novel binary solution (DETA/H2O) reaction for preparing a composite catalyst composed of CdS nanoparticles grown on CoSe2 nanobelts. The composite catalyst (CoSe2/CdSDETA) exhibits excellent catalytic activity for a hydrogen evolution reaction in an EY sensitized 15% (v/v) TEOA aqueous solution under visible light irradiation (λ ≥ 420 nm). Moreover, the catalytic activity of the P-doped sample (CoSe2/CdSDETA|P) was further improved. The excellent performance is ascribed to the synergy among DETA and atomic-level P-doping. Some essential characterization methods such as XRD, SEM, TEM, UV-vis diffuse spectroscopy, XPS, photoelectrochemistry, PL, etc. were carried out to support the related results and a possible reaction mechanism was put forward.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 4
·H87
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IF 3.12
Jinnan Wu,Yuhan Zhu,Kai Yan,Jingdong Zhang
Redox active hexacyanoferrate (HCF) was immobilized on CdS-graphene (CdS-G) electrode to study the photovoltammetric behavior of p-phenylenediamine (PPD). Under visible light illumination, the immobilized HCF could quickly consume photogenerated carriers on CdS-G electrode and mediate the photoelectrocatalytic oxidation of PPD, leading to an enhanced anodic limiting current response. The HCF/CdS-G electrode fabricated with 1% graphene content in CdS-G composites and 0.3 mmol·L−1 K4[Fe(CN)6] was found to show the optimum photovoltammetric response to PPD. The fabricated HCF/CdS-G electrode was explored for photovoltammetric determination of PPD, which showed a current response linearly proportional to PPD concentration from 1.0 × 10−7 to 1.0 × 10−5 mol·L−1. The detection limit (3S/N) was 4.7 × 10−8 mol·L−1. Moreover, the HCF/CdS-G electrode displayed good reproducibility and high stability. The developed photovoltammetric method was successfully applied to the determination of PPD in environmental water samples.
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Advanced Materials Interfaces
·
2019
·Vol. 6
·期 12
·1900367
·
IF 4.713
Lun Cai,Wenxian Wang,Lei Jin,Zhirong Yao,Wenjie Lin,Lanxiang Meng,Bin Ai,Zongcun Liang,Yuelong Huang,Fuqin Zhang,Pietro P. Altermatt,Hui Shen
Most crystalline silicon (c-Si) solar cells are based on high temperature–processed p-n junctions or highly doped heterojunctions. The concept of dopant-free carrier selective contact has become a research hotspot and been successfully demonstrated with n-type Si wafers, showing the great potential of simplified fabrication process and lower thermal-consuming. However, there are few successful cases on p-Si, dopant-free p-Si/CdS (cadmium sulfide)/ITO (indium tin oxide) solar cells with champion efficiency of 12.29% (device area 4 cm 2 ) have been demonstrated with DC magnetron sputtered CdS thin films working as electron-selective contact. A proper annealing treatment is found essential in improving the p-Si/CdS/ITO heterocontact and device performance. The author's preliminary results confirm the feasibility of preparation of efficient p-Si wafer–based dopant-free solar cells.
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OPTICS EXPRESS
·
2019
·Vol. 27
·期 6
·7935-7944
·
IF 3.561
Yanbin Zhang,Fengjuan Zhang,Hongzhe Wang,Lei Wang,Fangfang Wang,Qingli Lin,Huaibin Shen,Lin Song Li
In this paper, we report the synthesis, the structural and optical characterization of CdSe/CdS//CdS nanorods (NRs) and their exploitation in nanorod-based light-emitting diodes (NR-LEDs). Two kinds of NRs of CdSe/CdS and CdSe/CdS//CdS were incorporated into the structure of solution-processed hybrid NR-LEDs. Compared to CdSe/CdS, the efficiencies of CdSe/CdS//CdS NR-based LEDs are overwhelmingly higher, specifically showing unprecedented values of peak current efficiency of 19.8 cd/A and external quantum efficiency of 15.7%. Such excellent results are likely attributable to a unique structure in CdSe/CdS//CdS NRs with a relatively high quantum yield, thick CdS outer shell, and rod structure which minimize nonradiative energy transfer between closely packed NRs in emitting layer.
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JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
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2019
·Vol. 107
·期 7
·1532-1540
·
IF 3.221
Mingchen Zhou,Fei Xie,Guocang Li,Qiyang Wang,Longxiang Tang,Manqing Yan,Hong Bi
The trinary hydroxyapatite@Fe 3 O 4 @N-doped carbon dots (HA@Fe 3 O 4 @N-CDs) hybrids were prepared by one-pot hydrothermal approach and utilized to detect and remove lead ion from aqueous solution. The structures and morphologies of as-obtained nanorod-like HA@Fe 3 O 4 @N-CDs hybrids were characterized by X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy measurements. These HA@Fe 3 O 4 @N-CDs hybrids possess good magnetism by magnetic hysteresis test and multi-colored fluorescence by the CLSM measurement. Furthermore, the as-obtained hybrids display excellent biocompatibility by MTT assay. Importantly, the trinary magnetic HA@Fe 3 O 4 @N-CDs hybrids as a green detector and adsorbent of Pb 2+ were investigated. The influence of the different pH, the concentration of heavy metal, and the maximum adsorption capacity on removal efficiency was measured in detail. The maximum Pb 2+ adsorption capacity on HA@Fe 3 O 4 @N-CDs hybrids is 450 mg/g. The kinetic mechanism was a pseudo-second order model, and the isotherm data was fitted well by the Langmuir isotherm and Freundlich model. Hence, the nanorod-like HA@Fe 3 O 4 @N-CDs hybrids could be a multifunctional material with significant potential applications in heavy metal detection and adsorption, bone tissue regeneration, magnetic therapy, and biomedicine. © 2019 Wiley Periodicals, Inc. J Biomed Mater Res Part A, 2019.
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JOURNAL OF ELECTRONIC MATERIALS
·
2019
·Vol. 48
·期 10
·6397-6405
·
IF 1.676
Yang Mengru,Shi Yonghong,Li Yuangang,Li Huajing,Luo Ningdan,Li Jin,Fan Jing,Zhou Anning
Abstract 2D Bi 2 S 3 /CdS nanosheet arrays have been constructed by a simple three-step method. Firstly, BiOI nanosheet arrays have been electrochemically grown on the surface of conductive FTO substrate and then converted into Bi 2 S 3 nanosheet arrays by ion exchange. Finally, CdS was hydrothermally deposited onto the surface of Bi 2 S 3 nanosheet arrays to form hybrid Bi 2 S 3 /CdS nanosheet arrays. The obtained hybrid heterojunction arrays have been used as photoanodes for photoelectrochemical hydrogen evolution and showed enhanced performance and prolonged stability. The photocurrent density of the elegant Bi 2 S 3 /CdS nanosheet arrays reaches 9.48 mA/cm 2 at 1.23 V RHE under an illumination of 100 mW/cm 2 from AM 1.5G sun simulator, which is more than ten times higher than that of the pure Bi 2 S 3 nanosheet arrays and the photocurrent density does not decline obviously after 4 h of continuous operation. Ultimately, a rational mechanism is proposed to elucidate the high performance and excellent stability of Bi 2 S 3 /CdS nanosheet arrays for photoelectrochemical cells. Graphic Abstract To obtain nanosheet arrays : Arrays of Bi 2 S 3 /CdS nanosheets on a FTO substrate are synthesized by electrodeposition, ion exchange and hydrothermal process. The Bi 2 S 3 /CdS nanosheet photoanodes show better photoactive and photostability compared to bare Bi 2 S 3 (CdS) nanosheets for photoelectrochemical splitting of water.
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Functional Materials Letters
·
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
·
2018
·
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
·
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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