JOURNAL OF CRYSTAL GROWTH
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2019
·
IF 1.573
Kun Wang,Baokun Liu,Peixu Yang,Jinhui Liu,Weidong Zhang,Chengduo Wang,Haojie Lü,Guanwei Jia,Rongbin Li,Shaojun Zhang,Jiang Du
Branched CuInSe 2 nanowires (NWs) are successfully synthesized by one-pot method for making secondary bismuth nanoparticles to attach onto the CuInSe 2 NWs stem for inducing the secondary branch growth by solution-liquid-solid (SLS). The branched CuInSe 2 NWs were measured in order to reveal its viability for PV device fabrication and application for the light-absorbing material in solar cells.
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ChemSusChem
·
2019
·Vol. 13
·期 1
·260-266
·
IF 7.804
Dengfeng Yu,Zhuo Li,Gongyuan Zhao,Hong Zhang,Hüsnü Aslan,Jiwei Li,Feifei Sun,Lin Zhu,Baosheng Du,Bin Yang,Wenwu Cao,Ye Sun,Flemming Besenbacher,Miao Yu
Graphical NiSe and easy does it : Porous ultrathin NiSe nanosheet networks (NiSe NNs) on nickel foam fabricated by selenylation/pickling of Mn-doped α-Ni(OH) 2 afford electrodes with high ion mobility, abundant activated sites, and low resistance. The NiSe NNs electrodes had an ultrahigh capacity of 443 mA h g −1 (807 μAh cm −1 ) at 3.0 A g −1 . The assembled hybrid supercapacitor had a high energy density of 66.6 Wh kg −1 with excellent cycling stability. Transition metal selenides (TMSs) with excellent electrochemical activity and high intrinsic electrical conductivity have attracted considerable attention owing to their potential use in energy storage devices. However, the low energy densities of the reported TMSs, which originate from the small active surface area and poor electrolyte ion mobility, substantially restrict their application potential. In this work, porous ultrathin nickel selenide nanosheet networks (NiSe NNs) on nickel foam are fabricated by using a novel, facile method, that is, selenylation/pickling of the pre-formed manganese-doped α-Ni(OH) 2 . Removal of Mn resulted in NNs with a highly porous structure. The 3D framework of the NNs and the inherent nature of the NiSe affords high ion mobility, abundant accessible activated sites, vigorous electrochemical activity, and low resistance. One of the highest specific capacities of TMSs ever reported, that is, 443 mA h g −1 (807 μAh cm −2 ) at 3.0 A g −1 , is achieved with the NNs as electrodes. The assembled NiSe NNs//porous carbon hybrid supercapacitor delivers a high energy density of 66.6 Wh kg −1 at a power density of 425 W kg −1 , with excellent cycling stability. This work provides a new strategy for the production of novel electrode materials that can be applied in high-performance hybrid supercapacitors, and a fresh pathway towards commercial applications of hybrid supercapacitors based on TMS electrodes.
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NANOTECHNOLOGY
·
2019
·Vol. 30
·期 45
·455601
·
IF 3.399
Xiaoshuang Chen,Xiangfeng Guo,Lihua Jia,Xin Wang,Kun Song,Chunling Zuo,Rui Yang,Jinping Wang
Optimizing of electrocatalytic hydrogen evolution reaction (HER) activity is still a gigantic challenge for improving catalysts in renewable energy field. In this research, large-scale neoteric three-dimensional (3D) hierarchical MoSe2 hollow sphere arrays with like-Pacific Plate architecture were triumphantly prepared via a facile and reliable approach. The like-Pacific Plate architecture consists of many 3D MoSe2 arrays plates with the dimensions of 10–35 μm, which is assembled by plentiful closely connecting hierarchical MoSe2 hollow spheres with the outer diameter, hierarchically secondary unit size and shell thickness of 450 nm, 25 nm and 10 nm, respectively. The products exhibited remarkable HER performance with small Tafel slope (58.5 mV dec−1), low overpotential (169.8 mV) at 10 mA cm−2, high conductivity and durable stability, which are attribute to the mechanisms (1) 3D hollow framework furnishes large specific surface area, (2) hierarchical structure generates more active sites, (3) like-Pacific Plate architecture facilitates the touch of electrolyte and catalyst, and (4) closely packed arrays expedite the migration of electron. The current work indicates that unique 3D hierarchical hollow sphere arrays with like-Pacific Plate architecture will be a potential candidate for effective electrocatalytic water splitting catalyst material with energy source application.
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Applied Materials Today
·
2018
·
IF 0
Bowen Zhao,Zhongquan Wan,Junsheng Luo,Chunyang Jia,Xingzhao Liu,Ruilin Wang
Sb 2 Se 3 with its excellent optical, electrical properties emerging as a promising next-generation light harvesting material has gained immense research interest. However, in the Sb 2 Se 3 photovoltaic devices , the impediment of charge transport within the layered structure dragged down the device performance. Here, for the first time, we reported the air-stabled Sb 2 Se 3 sensitized solar cells (SSCs) modified with CdSe interlayer at the TiO 2 /Sb 2 Se 3 heterojunction through successive ionic layer adsorption and reaction (SILAR) process. CdSe modification provided the reduced TiO 2 work function, enhanced optical absorption and suppressed charge recombination. The short-circuit current density, fill factor and open-circuit voltage of the Sb 2 Se 3 SSCs were all remarkably improved. When CdSe layer with five SILAR cycles was applied, the device power conversion efficiency (PCE) was as high as 1.96%, which was the highest recorded PCE of Sb 2 Se 3 nanoparticle based solar cells. Our work illustrates that interfacial engineering provided a useful route to adjust the interface configuration in Sb 2 Se 3 based solar cell and optoelectronic applications .
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Yuanyuan Geng,Manli Guo,Jiean Tan,Shuyi Huang,Youwen Tang,Lei Tan,Yong Liang
This paper describes an alternative strategy for fabricating a fluorescent aptamer functionalized molecularly imprinted polymer (MIP) for highly specific sensing of kanamycin. The technique provides surface imprinting in aqueous solutions using CdSe quantum dots as supports, thiols modified aptamer and methacrylic acid as functional monomers, and kanamycin as a template. The MIP would function utilizing double recognition of the aptamer and imprinted cavities for fluorescent sensing of kanamycin. The “thiol-ene” click reaction was utilized to fix the aptamer into polymer matrix, and the click chemistry used was highly efficient under mild condition and environmentally friendly. Experimental results indicated that there was a synergistic interaction between the aptamer and MAA, which improved the recognition ability of MIP toward kanamycin. The MIP showed an imprinting factor of 3.51 for kanamycin, excellent analog selectivity, and strong resistance toward ions interference. The fluorescence intensity of the MIP enhanced gradually with increase in the concentration of kanamycin, and exhibited good linear correlation within the concentration of 0.05–10.0 μg/mL with a detection limit of 0.013 μg/mL. This fluorescent MIP was further applied to quickly, sensitively and simply sensing of kanamycin in food, water and biological samples which yielded satisfied results.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2018
·
IF 5.018
Chunyan Wu,Lijian Zhang,Honghe Ding,Huanxin Ju,Xin Jin,Xiaomin Wang,Changfei Zhu,Tao Chen
Sb 2 S 3-x Se x (0 ≤x ≤ 3) is promising for practically applicable solar cell since it possesses excellent stability, suitable band gap, high extinction coefficient and abundant elemental storage. This study demonstrates a novel methodology towards simultaneous dissolution of Se and Sb 2 O 3 for direct deposition of Sb 2 S 3-x Se x films. Mechanistic study shows that the formation of selenium-nitrogen free radical in sulfur-containing complex is responsible for the dissolution of selenium. The energy levels of the as-synthesized Sb 2 S 3-x Se x were examined by synchrotron radiation photoemission spectroscopy , revealing that more Se in the Sb 2 S 3-x Se x leads to the valence band shifting considerably upward while the conduction band remaining nearly unchanged. Moreover, for the first time we present that the solution processed Sb 2 S 3-x Se x can generate photovoltaic performance with an efficiency of 5.8%. This research provides a straightforward strategy for the fabrication of Sb 2 S 3-x Se x solar cells and offers an effective method for the synthesis of metal selenosulfide films.
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CRYSTAL GROWTH & DESIGN
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2018
·
IF 3.972
Xiao-Ning Hu,Lin Xiong,Li-Ming Wu
The A2MIIMIV3Q8 family (A = alkali metal; MII = divalent metal; MIV = tetravalent metal; Q = chalcogenide) has attracted much attention because of its diverse structures and properties. Herein, we have successfully synthesized six new compounds as the first Mn-containing members of this family, Cs2MnGe3S8 (1), Cs2MnGe3Se8 (2), Cs2MnSn3Se8 (3), Rb2MnGe3S8 (4), Rb2MnGe3Se8 (5), and Rb2MnSn3Se8 (6). Compounds 1 and 6 crystallize in the monoclinic space group P21/n (No. 14) and P21 (No. 4), respectively, whereas compounds 2–5 crystallize in the non-centrosymmetric orthorhombic P212121 (No. 19). According to our theoretical calculations, their energy gaps are mainly dominated by s states of MIV and p states of Q and minor Mn 3d. Plate-like crystals with sizes about 20 × 5 × 1 mm3 of 2 and 3 are obtained by the Bridgeman method. In addition, we propose a structure mismatch factor that is defined as F = rMII+ rMIV + 2rQ2– – 2rA+ to provide a clear description of how three different structure types distribute among the A2MIIMIV3Q8 family; when 1.2 < F < 1.9, members will adopt a P212121-type structure; when F is too small (<1.2) or too large (>1.9), P21/n or P21-type, respectively, will be taken.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Jun Wan,Baihong An,Zhibeng Chen,Jingwei Zhang,William W. Yu
Nitrogen doped graphene oxide (NG) modified WSe 2 nanorod composites (WSe 2 /NG) were prepared by a hydrothermal synthesis route. The synthesized samples were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectroscopy(DRS) and elemental analysis . Using methylene blue (MB) as a target organic dye, WSe 2 /NG nanocomposites exhibited significant enhancement in photocatalytic degradation of MB under visible light irradiation compared with WSe 2 . That was mainly attributed to the strong adsorption of MB, excellent electrical conductivity and charge separation features of the NG, leading to effectively restrained electron-hole pair recombination of WSe 2 nanorods. Among the hybrid photocatalysts , WSe 2 /50NG (50 wt% of NG) exhibited the highest photocatalytic activity with a rate constant of 0.0572 min −1 for the degradation of the MB in aqueous solution under visible light irradiation, and the removal efficiency reached 99.3% which was 2.4 times higher than that of WSe 2 . In addition, WSe 2 /NG also showed higher stability and good reusability.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
He Li,Jiali Jiang,Jianxing Huang,Yunhui Wang,Yueying Peng,Yiyong Zhang,Bing-Joe Hwang,Jinbao Zhao
In this study, one-dimensional Cu2–xSe nanorods synthesized by a simple water evaporation-induced self-assembly approach are served as the anode material for Na-ion batteries for the first time. Cu2–xSe electrodes express outstanding electrochemical properties. The initial discharge capacity is 149.3 mA h g–1 at a current density of 100 mA g–1, and the discharge capacity can remain at 106.2 mA h g–1 after 400 cycles. Even at a high current density of 2000 mA g–1, the discharge capacity of the Cu2–xSe electrode still remains at 62.8 mA h g–1, showing excellent rate performance. Owing to the excellent electronic conductivity and one-dimensional structure of Cu2–xSe, the Cu2–xSe electrodes manifest fast Na+ ion diffusion rate. Moreover, detailed Na+ insertion/extraction mechanism is further investigated by ex situ measurements and theoretical calculations.
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Advanced Optical Materials
·
2019
·Vol. 7
·期 5
·1800579
·
IF 7.125
Yuting Ye,Yuehui Xian,Jiawen Cai,Kaicheng Lu,Zhengzheng Liu,Tongchao Shi,Juan Du,Yuxin Leng,Rongfei Wei,Weiqi Wang,Xiaofeng Liu,Gang Bi,Jianrong Qiu
Monochalcogenides of group IV elements have been considered as phosphorene analogs due to their similar crystal and electronic structure. Here, few-layer SnSe nanosheets are synthesized by a sonication-assisted liquid phase exfoliation process and their linear and nonlinear optical properties are examined. The as-exfoliated few-layer (FL) SnSe demonstrates layer thickness from 2 to 10 nm and lateral size of 150 nm with high crystallinity. Optical measurement confirms the layer-number dependent bandgap, which is also corroborated by first-principle calculation. In addition, the FL SnSe shows a transition from saturable absorption to reverse saturable absorption with the increase of pumping power, and the nonlinear absorption is characterized by an ultrafast response time of picosecond scale. The nonlinear optical response in FL SnSe could be explained by defect-involved recombination of photogenerated carriers as well as the Auger scattering process, which is further enhanced by structural two-dimensionality.
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ACS Biomaterials Science & Engineering
·
2018
·
IF 4.432
Guoqing Ma,Jie Liu,Jinlin He,Mingzu Zhang,Peihong Ni
The development of novel stimuli-responsive and biodegradable polyphosphoester-anticancer prodrugs is of importance in designing water-soluble prodrugs utilized in the field of drug delivery. In this study, the focus is on the synthesis of biocompatible and biodegradable diselenide-containing polyphosphoester [PEEP-b-PBYP-Se]2 using reduction-responsive di(1-hydroxylundecyl) diselenide as an initiator to polymerize 2-(but-3-yn-1-yloxy)-2-oxo-1,3,2-dioxaphospholane (BYP) and 2-ethoxy-2-oxo-1,3,2-dioxaphospholane (EOP). After that, a doxorubicin (DOX) derivative containing an azide group was linked onto the side chain of [PEEP-b-PBYP-Se]2 via the Cu(I)-catalyzed azide–alkyne cycloaddition (CuAAC) “click” reaction to yield a pH/reduction-responsive polymeric prodrug, namely [PEEP-b-(PBYP-hyd-DOX)-Se]2. The chemical structures of various polymers were characterized by nuclear magnetic resonance spectroscopy, ultraviolet–visible spectrophotometer, Fourier transform infrared spectroscopy, and high-performance liquid chromatography. The self-assembly behavior measured by dynamic light scattering and transmission electron microscopy clearly supported the formation of the prodrug nanoparticles (NPs). The results indicated that the polymeric prodrug NPs were relatively uniform spheres that could maintain stability in a physiological condition but be cleaved in acidic or reductive medium. Furthermore, the pH- and reduction-responsive properties of the prodrug NPs were investigated via drug release in vitro in different media. It turned out that the drug was efficiently released in acidic or reductive medium compared with that under physiological conditions. The results of methyl thiazolyl tetrazolium assays confirmed the favorable biocompatibility of [PEEP-b-PBYP-Se]2. Moreover, the cell cytotoxicity and intracellular uptake experiments were carried out to verify the efficient cellular proliferation inhibition. This finding contributes to the design of a novel diselenide-containing polyphosphoester-doxorubicin prodrug.
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BIOSENSORS & BIOELECTRONICS
·
2018
·
IF 8.173
Xing-Pei Liu,Jing-Shuai Chen,Chang-jie Mao,He-Lin Niu,Ji-Ming Song,Bao-Kang Jin
A novel enhanced photoelectrochemical DNA sensor, based on a TiO 2 /Au hybrid electrode structure , was developed to detect target DNA. The sensor was developed by successively modifying fluorine-tin oxide (FTO) electrodes with TiO 2 nanoparticles , gold (Au) nanoparticles, hairpin DNA (DNA1), and CdSe-COOH quantum dots (QDs), which acted as signal amplification factors . In the absence of target DNA, the incubated DNA1 hairpin and the CdSe-COOH QDs were in close contact with the TiO 2 /Au electrode surface , leading to an enhanced photocurrent intensity due to the sensitization effect. After incubation of the modified electrode with the target DNA, the hairpin DNA changed into a double helix structure, and the CdSe QDs moved away from the TiO 2 /Au electrode surface, leading to a decreased sensitization effect and photoelectrochemical signal intensity. This novel DNA sensor exhibited stable, sensitive and reproducible detection of DNA from 0.1 μM to 10 fM, with a lower detection limit of 3 fM. It provided good specificity, reproducibility, stability and is a promising strategy for the detection of a variety of other DNA targets, for early clinical diagnosis of various diseases.
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