NANOTECHNOLOGY
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2018
·Vol. 29
·期 18
·185602
·
IF 3.404
Zhen Hu,Qing Shao,Yudong Huang,Long Yu,Dayu Zhang,Xirong Xu,Jing Lin,Hu Liu,Zhanhu Guo
The interfacial microcracks in the resin matrix composites are difficult to be detected and repaired. However, the self-healing concept provides opportunities to fabricate composites with unusual properties. In the present study, photothermal conversion Ag–Cu2S nanoparticles were immobilized onto poly(p-phenylene benzobisoxazole) (PBO) fibers via a polydopamine chemistry. Benefitting from the photothermal effects of Ag–Cu2S, the obtained PBO fibers (Ag–Cu2S–PBO) efficiently converted the light energy into heat under Xenon lamp irradiation. Then, single PBO fiber composites were prepared using thermoplastic polyurethane as the matrix. It was found that the interfacial damage caused by single fiber pull-out was simply self-healed by Xe light irradiation. This wonderful interfacial damage self-healing property was mainly attributed to the in situ heating generation via photothermal effects of Ag–Cu2S in the composite interface. This paper reports a novel strategy to construct advanced composites with light-triggered self-healing properties, which will provide inspiration for preparing high performance composite materials.
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Nano Energy
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2018
·
IF 13.12
Yuanhui Cheng,Dongming Li,Lei Shi,Zhonghua Xiang
Air-based flow batteries have triggered huge interests as promising large-scale energy storage devices due to their high energy density and extremely low cost. However, the sluggish kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) lower their energy conversion efficiencies . Herein, we in situ grow amorphous NiS x -FeO y particles on sulfur doped carbon fiber paper (termed as NiS x -FeO y /SCFP) as practical self-supported oxygen electrode through a simple and economic synthesis route. Benefiting from the synergetic effects of amorphous NiS x -FeO y and SCFP, NiS x -FeO y /SCFP possesses massively accessible active sites, enhanced electrons and reactants transfer, and stable integrated structure, exhibiting a low overpotential (0.37 V) at 10 mA cm −2 for OER, a positive half-wave potential for ORR and a small potential gap (0.82 V). Zinc air flow battery assembled with newly developed NiS x -FeO y /SCFP shows a coulombic efficiency of 100% and a voltage efficiency of 50% at the charge-discharge current of 10 mA cm −2 , and vigorously operates 110 h without performance decay, showing highly catalytic activity and super cycling stability, which are among the best performance ever reported. We believe that this work will open up new ways for fabricating practical oxygen electrode for metal air based batteries applications.
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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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CHEMICAL ENGINEERING & TECHNOLOGY
·
2018
·Vol. 41
·期 6
·1180-1187
·
IF 1.588
Haijiao Lu,Jingkang Wang,Beiqian Tian,Xin Huang,Jingtao Bi,Ting Wang,Hongxun Hao
As persistent and detrimental contaminants, azo dyes are difficult to be removed from wastewater. It is a worldwide challenge to develop efficient technologies for their removal. Adsorption is widely recognized to be a practical, efficient, and low-cost technology for removal of contaminants. Compared with various conventional adsorbents, MoS 2 nanocrystals possess larger specific surface area, higher surface energy, and better adsorptive properties. Since nitrogen-doping is a common approach for modification of materials, N-doped MoS 2 nanocrystals (NDMN) were first used as adsorbents for removal of the azo dye methyl orange. Compared with bulk MoS 2 and MoS 2 nanocrystals, NDMN showed much higher efficiency and reusability. This study provides inspiration for exploring and expanding the applications of NDMN.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Xinyan Shi,Jiaxin Song,Fengqi Zhao,Hongxu Gao,Xinbing Chen,Pei Chen,Zhongwei An,Yu Chen
Developing an efficient, stable and low cost oxygen reduction reaction electrocatalyst is desirable for fuel cells and metal-air batteries. Here, we have successfully prepared multi-element doped carbon nanobowls by simply mixing the porous carbon nanobowls and sulfur doped graphitic carbon nitride quantum dots in FeCl 3 solution and subsequent high temperature treatment processes. Compared with the commercial Pt/C electrocatalyst, the multi-element doped carbon nanobowls display a comparable half-wave potential of 0.82 V, much larger limiting diffusion current density (0.4–0.8 V), better methanol-tolerance and higher long-term stability for the oxygen reduction reaction in alkaline media. The robust three-dimensional porous structure of carbon nanobowls and multiple active centers derived from Fe, N, S and O co-doping are responsible for the excellent performance. This work suggests that such multi-element doped carbon nanobowls can be a promising alternative for Pt-based catalysts in fuel cells.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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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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BIOSENSORS & BIOELECTRONICS
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2018
·
IF 8.173
Xiaoqiang Liu,Peipei Liu,Yunfei Tang,Liwei Yang,Lele Li,Zhichong Qi,Deliang Li,Danny K.Y. Wong
In this work, a sensitive photoelectrochemical aptasensor was developed for kanamycin detection using an enhanced photocurrent response strategy, which is based on the surface plasmon resonance effect of gold nanoparticles deposited on a 3D TiO 2 -MoS 2 flower-like heterostructure . A significant aspect of this development lies in the photoelectrochemical and morphological features of the unique ternary composite, which have contributed to the excellent performance of the sensor. To develop an aptasensor, mercapto-group modified aptamers were immobilised on the photoactive composite as a recognition unit for kanamycin. The TiO 2 -MoS 2 -AuNP composite was demonstrated to accelerate the electron transfer , increase the loading of aptamers and improve the visible light excitation of the sensor. Under optimal conditions, the aptasensor exhibited a dynamic range from 0.2 nM to 450 nM of kanamycin with a detection limit of 0.05 nM. Overall, we have successfully synergised both the electrical and the optical merits from individual components to form a ternary composite, which was then demonstrated as an effective scaffold for the development of PEC biosensors.
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 11
·9006-9015
·
IF 3.201
Huating Sun,Tianxing Wu,Yunxia Zhang,Dickon H. L. Ng,Guozhong Wang
Molybdenum disulfide (MoS2) was successfully synthesized via a facile one-step hydrothermal method without addition of templates or surfactants. The obtained MoS2 product was characterized via various techniques including FESEM, HRTEM, XRD, BET and XPS analyses. Their application in capturing Cr(VI) ions in water was investigated. The results showed that the MoS2 nanosheets were ultrathin with a thickness of 5–10 nm and had a uniform lateral size of 100–200 nm. Impressively, these MoS2 nanosheets not only possessed enlarged interlayer spacing, but also had multiple defects on the basal planes, which were proved to be crucial in the removal of Cr(VI). The kinetics of chromium adsorption was found to follow the pseudo-second-order rate equation and the adsorption isotherm data were well fitted to the Langmuir model with a chromium in-take capacity of about 84.03 mg g−1. This structure-enhanced removal was likely related to the synergism of adsorption and reduction, in which the anionic Cr(VI) was adsorbed on the surface of D-MoS2via electrostatic interaction. At the same time, some fraction of the adsorbed Cr(VI) was reduced to low toxic Cr(III) and the generated Cr(III) species were adsorbed by the adsorbent. More significantly, the adsorption and reduction processes not only transferred the Cr(VI) from the aqueous environment to the surface of solid adsorbents but also alleviated the toxicity of Cr(VI). It was evident that this study may promote the application of other transition metal dichalcogenides in environmental remediation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Changjian Li,Yueqi Wang,Xiaojie Zhang,Xueling Guo,Xiaoxuan Kang,Libo Du,Yang Liu
Carbon dots have attracted considerable attention in the field of biosensors and bioimaging because of their excellent optical performance and low toxicity. However, the cellular uptake of the reported carbon dots generally has a low efficiency, which limits their practical applications. In this study, we reported a novel red fluorescent sulfur and nitrogen co-doped carbon dots with small molecular phenylboronic acid tags (i.e. S, N-CDs-PBA). The S, N-CDs-PBA can be taken up rapidly by PC12 cells in twenty minutes and showed high sensitivity for the detection of Fe 3+ ions. The maximum emission wavelength is at 593 nm under the excitation of 550 nm. The absolute fluorescence quantum yield is 23% in water. The fluorescence can be effectively and selectively quenched by Fe 3+ ions and the linear response range of Fe 3+ ions was obtained from 0.3 µM to 5.0 µM with a detection limit as low as 0.1 µM. It could be concluded that the rapid uptake of S, N-CDs-PBA into cells and high photoluminescence quantum yield of red emission are beneficial for quick detection of Fe 3+ ions.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xiaoyan Wang,Ying Xie,Zhicheng Cai,Ni Xiong,Zhikun Xu,Mingxia Li,Qingmao Feng,Wei Zhou,Kai Pan
In this work, the sesame ball-like CoS/MoS 2 nanospheres were controllably synthesized via a facile hydrothermal and solvothermal consecutive reaction. MoS 2 nanospheres were preferentially formed by assembly of nanosheets during the hydrothermal reaction . And then CoS nanoparticles were grown on the surface of MoS 2 nanosheets during the solvothermal reaction method. Due to the space confinement effect, CoS grew as nanoparticles with size of 5 nm between MoS 2 nanosheets, and the nanosheets assembled into nanospheres to get the sesame ball-like structure. Because this composite possessed two merits, that is, more active sites of CoS nanoparticles and high conductivity of MoS 2 nanospheres, DSSCs based on this sesame ball-like CoS/MoS 2 nanospheres got a higher power conversion efficiency of 7.48%, which was higher than that based on the solo CoS (7.10%) and solo MoS 2 (4.84%). And it was similarly to the DSSCs based on Pt cathode (7.51%). Their excellent electrocatalytic activities for the I 3 − /I − redox reaction was confirmed by cyclic voltammetry , electrochemical impedance spectra and Tafel polarization measurements. Density functional theory was also used to calculate the adsorption of I 3 − on the surface of CoS/MoS 2 , and the adsorption energy and bond length results indicated Co atoms were the main catalytic active site for I 3 − reduction. The hybrid interactions took place between p orbital of I and 3d states of Co, which lead to I 3 − was activated and dissociated easily.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Junjie Pan,Xin Sun,Tao Wang,Zetao Zhu,Yuping He,Wei Xia,Jianping He
Magnetic metallic materials compounded with dielectric loss materials are promising for efficient microwave absorption as a result of the synergistic effect between dielectric loss and magnetic loss, as well as the optimized impedance matching. In this paper, porous coin-like structured Fe@MoS 2 composite has been fabricated via solvothermal method accompanied by subsequent heat treatment under H 2 /Ar atmosphere. The structure and morphology of as-prepared Fe@MoS 2 composite indicates that MoS 2 nanosheets with the two-dimensional (2D) structure are well dispersed on the porous coin-like Fe micro-sheets to form a core-shell structure. Particularly, the addition of MoS 2 regulates the permittivity as well as improves the impedance matching of the Fe@MoS 2 composite. The as-prepared composite shows efficient microwave absorption properties with the maximum effective absorption bandwidth (reflection loss below −10 dB) of about 4.73 GHz (11.13–15.86 GHz) at the corresponding coating thickness of 2.0 mm, accompanied by the minimum reflection loss of about −37.02 dB. When the calcination temperature increases to 650 °C, the effective microwave absorption frequency band shifts to the lower frequency (9.91–14.19 GHz) with the minimum reflection loss of about −35.5 dB under the coating thickness of 2.0 mm. Considering the efficient microwave attenuation, the as-fabricated porous coin-like Fe@MoS 2 composite can be a hopeful candidate in the field of microwave absorption.
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NANO
·
2018
·
IF 1.1
Kaidi Li,Fangfang Zhang,Huiming Wang,Yalan Zhou,Lixin Zhao,Jimin Du,Yating Gao,Weimin Wang,Dae Joon Kang
Here, the lamellar-shaped Bi 2 S 3 grown on a porous TiO 2 monolith was obtained by a two-step method including a sol–gel route and hydrothermal treatment. The photocatalytic activity of the as-synthesized Bi 2 S 3 /TiO 2 composites was evaluated for photodegradation of methylene blue (MB) dye in aqueous solution under the visible-light irradiation. Based on our experimental results, 5% (molar ratio of Bi 2 S 3 to TiO 2 ) Bi 2 S 3 /TiO 2 photocatalysts exhibited a maximum photodegradation rate of MB up to 96.9% under visible-light irradiation for 120 min. Our findings indicated that the lamellar-shaped Bi 2 S 3 can extend the light absorption up to visible areas, and porous TiO 2 can provide enhanced specific surface area and more mass transfer pathway to enhance the photodegradation efficiency. Furthermore, porous TiO 2 can accept the electrons from the Bi 2 S 3 conduction band due to the relatively positive electrode potential to impede the photoproduced electron and hole combination to result in advanced photocatalytic performance.
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