JOURNAL OF POWER SOURCES
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2018
·
IF 6.945
Wei Xing,Dongfeng Du,Tonghui Cai,Xiaochen Li,Jin Zhou,Yongming Chai,Qingzhong Xue,Zifeng Yan
Aluminum ion batteries are attractive new generation energy storage devices in large-scale energy applications such as grid storage due to its low cost, high safety and three-electron-redox properties potentially leading to high capacity. Cathode materials with both high capacity and rate performance are urgently needed to fulfill such applications. Here, a three-dimensional carbon-encapsulated cobalt selenide nanoparticles are developed from metal organic frameworks as a novel aluminum ion batteries cathode. The cathode material delivers an unprecedented capacity of 427 mAh g −1 at 1000 mA g −1 with two high discharge plateaus at 1.0 V and 1.9 V (equivalent to energy density of 424 Wh kg −1 ). And even at a very high current density of 5000 mA g −1 , the initial discharge capacity of cathode electrode can reach 254.8 mAh g −1 , and a high capacity of 62.4 mAh g −1 is retained after 100 cycles. Such outstanding performance are attributed to the well-defined nanostructure of three-dimensional carbon-encapsulated cobalt selenide cathode material. This work represents a significant step forward to prepare advanced cathode materials for aluminum ion batteries.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Qian Kuang,Chunli Li,Zhiwei Qiu,Guifen Jie,Shuyan Niu,Tingyu Huang
In this work, a target-triggered three-way junction (3-WJ) structure was combined with enzyme-powered cascade amplification strategy for ultrasensitive electrochemiluminescence (ECL) detection of microRNA via free-running DNA walker. In the presence of target microRNA-21 (miRNA-21), a three-way junction structure was formed to trigger enzyme-aided multiple DNA amplification, and thus exponentially amplified triggers were generated. Then, the trigger DNA could hybridize with the blocking DNA on the electrode to release walker DNA, which specifically combined with the quantum dots (QDs)-DNA probe, and formed a recognition site for Nt.BbvCI. The movement of DNA walker is powered by the nicking endonuclease that cleaves specific QDs-DNA probes on the track. Thus one walker DNA can automatically cleave multiple QDs probes on the electrode during the movement, resulting in significantly amplified changes of ECL signal, which could be used for the highly sensitive detection of target miRNA-21. Under the optimal conditions, the ECL signal change is linear with the concentration of miRNA-21 in the range from 10 −14 M to 10 -7 M with a detection limit of 1.5 fM. This newly established strategy could achieve rapid, isothermal, and homogeneous signal amplification for specific nucleic acids in complicated biomatrix, which hold great potential for application in early clinical diagnosis.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
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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
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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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Journal of Materials Chemistry A
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2018
·Vol. 6
·期 24
·11424-11434
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IF 9.931
Jingwen Huang,Bo Jin,Huiqiang Liu,Xiaojuan Li,Qingchun Zhang,Shijin Chu,Rufang Peng,Sheng Chu
Nitro-aromatic explosives existing on the surface of the Earth are difficult to degrade, and they greatly harm the ecological environment and human security. Herein, we successfully conducted the large-scale synthesis of novel flower-like MoSe2 3D microspheres and nanospheres by a simple hydrothermal method. The two types of MoSe2 3D spheres had a high crystal quality with abundant nanosheets, and their diameters were approximately 1.5 μm and 300–400 nm, respectively. The Brunauer–Emmett–Teller (BET) and UV-vis diffuse reflectance spectra (UV-vis DRS) analyses revealed that the specific surface area and the band gap of MoSe2 microspheres and nanospheres were 33.3 m2 g−1 and 1.68 eV and those of the nanostructures were 13.6 m2 g−1 and 1.52 eV, respectively. Moreover, two different morphologies of MoSe2 were used for the degradation of nitrobenzene (NB), p-nitrophenol (PNP) and 2,4-dinitrophenol (2,4-DNP) through a photocatalytic process. The results demonstrated that the three nitro-aromatic explosive solutions NB, PNP and 2,4-DNP (40 mg L−1) could be completely degraded by MoSe2 3D microspheres under visible-light irradiation in 3.5 h, 1.5 h and 2.5 h, and the degradation time for MoSe2 nanospheres was 4.5 h, 2.5 h and 4 h, respectively. The mechanism of the photocatalytic reaction was also investigated in detail, and the photocatalytic degradation process was found to follow the pseudo-first-order kinetics. Our study demonstrated the potential application of MoSe2 microspheres as a photocatalyst for the degradation of nitro-aromatic explosives and other organic contaminants.
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ACS Applied Materials & Interfaces
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2018
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IF 8.097
Jingling Li,Zheng Liang,Qiucheng Su,Hu Jin,Kelai Wang,Gang Xu,Xueqing Xu
For an organic–inorganic hybrid quantum dot light-emitting diode (QD-LED), enhancing hole injection into the emitter for charge balance is a priority to achieve efficient device performance. Aiming at this, we employ N,N′-bis(3-methylphenyl)-N,N′-bis(phenyl)benzidine (TPD) as the additional hole transport material which was mixed with poly(9-vinylcarbazole) (PVK) to form a composite hole transport layer (HTL) or was employed to construct a TPD/PVK bilayer structure. Enabled by this TPD modification, the green QD-LED (at a wavelength of 515 nm) exhibits a subband gap turn-on voltage of 2.3 V and a highest luminance up to 56 157 cd/m2. Meanwhile, such TPD modification is also beneficial to acquire efficient blue and red QD-LEDs. In particular, the external quantum efficiencies (EQEs) for these optimized full-color QD-LEDs are 8.62, 9.22, and 13.40%, which are 3–4 times higher than those of their pure PVK-based counterparts. Revealed by the electrochemical impedance spectroscopy, the improved electroluminescent efficiency is ascribable to the reductions of recombination resistance and charge-transfer resistance. The prepared QD-LEDs surpass the EQE values achieved in previous reports, considering devices with small-molecule-modified HTLs. This work offers a general but simple and very effective approach to realize the low turn-on-voltage, bright, and efficient full-color QD-LEDs via this solution-processable HTL modification.
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PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2018
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IF 6.945
Zhitong Jin,Meirong Zhang,Min Wang,Chuanqi Feng,Zhong-Sheng Wang
In quasi-solid-state dye-sensitized solar cells (QSDSSCs), electron transport through a random network of catalyst in the counter electrode (CE) and electrolyte diffusion therein are limited by the grain boundaries of catalyst particles , thus diminishing the electrocatalytic performance of CE and the corresponding photovoltaic performance of QSDSSCs. We demonstrate herein an ordered Co 0.85 Se hollow nanorods array film as the Pt-free CE of QSDSSCs. The Co 0.85 Se hollow nanorods array displays excellent electrocatalytic activity for the reduction of I 3 − in the quasi-solid-state electrolyte with extremely low charge transfer resistance at the CE/electrolyte interface, and the diffusion of redox species within the Co 0.85 Se hollow nanorods array CE is pretty fast. The QSDSSC device with the Co 0.85 Se hollow nanorods array CE produces much higher photovoltaic conversion efficiency (8.35%) than that (4.94%) with the Co 0.85 Se randomly packed nanorods CE, against the control device with the Pt CE (7.75%). Moreover, the QSDSSC device based on the Co 0.85 Se hollow nanorods array CE presents good long-term stability with only 4% drop of power conversion efficiency after 1086 h one-sun soaking.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 1
·288-295
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IF 1.354
Lu Simin,Li Meng,Liu Debao,Yang Yuntao,Yang Ping
A layer-by-layer (LbL) self-assembled method has been developed to create the nano architectonics consisted of quantum dots (QDs) including hydrophobic CdSe/CdZnS and hydrophilic CdTe and Au nanoparticles (NPs) through a functional silica layer as a linker on a slide glass. The glass
layer was created by the hydrolysis of 3-aminopropyltrimethoxysilane (APS), in which the amino group in APS plays an important role for the connection among QDs and Au NPs. UV-vis and PL spectroscopy, scanning electron microscopy, and transmission electron microscopy were employed to characterize.
The result reveals that Au NPs or QDs could be dispersed in the glass slides at a high concentration, and little aggregation. The PL intensity and absorbance is linearly increased with the number of dipping cycles. Furthermore, when the glass layer between Au NPs and CdTe QDs is thin, the
PL of the QDs quenched because of the Plasmon-enhanced fluorescence resonance energy transfer. In contrast, the bright PL of the QDs was observed when the glass layer became thick. The LbL self-assembled glass film shows excellent stability and transparency, which can make a promise for application
in biochemical, optoelectronic, and clinical diagnosis areas.
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高影响因子
MATERIALS RESEARCH BULLETIN
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2018
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IF 2.873
Kaimin Huang,Guowu Tang,Qianhang Luo,Guoquan Qian,Li Yang,Fangqiang Yuan,Zhenguo Shi,Qi Qian,Zhongmin Yang
Se 0.5 Te 0.5 semiconductor core optical fibers with phosphate glass cladding were fabricated by using a reactive molten core approach. The core was found to be amorphous with some oxygen diffusing in from the cladding glass. Crystalline Se 0.5 Te 0.5 (c-Se 0.5 Te 0.5 ) semiconductor core fibers were obtained by a post-drawing annealing process. Significant disparities in conductivity under stress and without stress were observed in c-Se 0.5 Te 0.5 semiconductor core fibers. To the best of our knowledge, this is the first time that stress sensing can be realized in c-Se 0.5 Te 0.5 semiconductor core optical fibers. This is in contrast to all previous work on stress sensing using fibers, which require the use of optical probing signals. In addition, it is found that more than 60 times change in conductivity between dark and illuminated states in c-Se 0.5 Te 0.5 semiconductor core fibers. These results demonstrate that c-Se 0.5 Te 0.5 semiconductor core optical fibers have promising applications in stress sensor, photodetector, and optical switch.
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Journal of Environmental Chemical Engineering
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2018
·
IF 0
Changchang Ma,Xin Yao,Lu Wang,Zihao Cai,Hai Huang,Xin Gao,Rongru Chen,Yang Liu,Pengwei Huo,Yongsheng Yan
A novel plasmonic photocatalysts of Ag@CdSe/Al 2 TiO 5 was successfully prepared via a simple and mild wet-chemical process. The physical and photophysical properties of the as-prepared Ag@CdSe/Al 2 TiO 5 samples were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), Ultraviolet–visible diffuse reflection spectroscopy (DRS), photoluminescence emission spectra (PL) and electrochemical impedance spectroscopy (EIS). The interaction between Ag@CdSe and Al 2 TiO 5 has been characterized by X-ray photoelectron spectroscopy (XPS) analysis, and which is facile to the electron transfer between Ag@CdSe and Al 2 TiO 5 and enhancing photocatalytic performance of Ag@CdSe/Al 2 TiO 5 composite photocatalyst. The photocatalytic experiments demonstrat that the Ag@CdSe species can efficiently improve the separation efficiency of photoinducing electrons and holes and consequently improve the methylene blue (MB) photodegradation activity. The 20 wt% Ag@CdSe/Al 2 TiO 5 sample exhibit the most superior photocatalytic activity. A possible photocatalytic mechanism of MB over Ag@CdSe/Al 2 TiO 5 is proposed, which can be attributed the success to the surface plasmon resonance (SPR) effect from Ag/AgCl species.
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ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Yi-Fan Jiang,Cheng-Zong Yuan,Xiao Zhou,Ya-Nan Liu,Zhi-Wei Zhao,Sheng-Jie Zhao,An-Wu Xu
The design of inexpensive, efficient, durable and self-supported bifunctional electrodes for simultaneously catalyzing the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in the same electrolyte is essential for renewable energy conversion processes and future sustainable development, however, it still remains a challenging issue. Reported herein is the first example of selenium phosphorus co-doped cobalt oxide nanosheets on highly conductive Co foil collector (CoOSeP@Co foil), fabricated by successively selenylation and phosphorization of a pre-oxidized Co foil, as a novel bifunctional electrode for water electrolysis. Due to the improved intrinsic catalytic activity of cobalt oxide derived from doping and the strong interaction between active CoOSeP nanosheets and highly conductive Co foil collector, the designed CoOSeP@Co foil integrated electrode displays favorable catalytic activities towards both HER and OER in strongly alkaline media, achieving an electrocatalytic current density of 10 mA cm −2 at a low overpotential of 155 mV for HER and 347 mV for OER, respectively. Beyond that, the electrode could keep working and maintain its catalytic activity for at least 30 h. Furthermore, an alkaline electrolyzer constructed by employing CoOSeP@Co foil as an integrated bifunctional electrode in both the cathode and anode can generate 10 mA cm −2 at a cell voltage of 1.74 V and shows good long-term stability of more than 30 h. This work not only opens a new avenue to improve the intrinsic catalytic activity of materials by co-doping with heteroatoms , but also brings us a new idea for designing other cost-effective, self-supported, efficient and robust overall water splitting electrodes.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 35
·17075-17085
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IF 9.931
Hancheng Yuan,Yuanying Yang,Yanna NuLi,Jun Yang,Jiulin Wang
Rechargeable magnesium–selenium (Mg–Se) batteries are promising electrochemical systems with higher energy density than traditional magnesium batteries. It has been widely accepted that electrophilic selenium cathodes can only be chemically compatible with non-nucleophilic electrolytes. Herein, we report for the first time on Mg–Se batteries containing a selenized polyacrylonitrile (Se/PAN) cathode, Mg anode and nucleophilic electrolyte. The Se/PAN composite with a moderate Se content (45.37 wt%) exhibits high rate capacity and cycling stability in an easily prepared (PhMgCl)2–AlCl3 based electrolyte. It delivers an initial discharge capacity of 338.2 mA h g−1 based on the mass of the whole composite at a rate of 100 mA g−1, and the capacity can be maintained at around 188.4 mA h g−1 after 100 cycles. Even at a high rate of 400 mA g−1, a capacity of 118.3 mA h g−1 can be obtained after 800 cycles with an inappreciable capacity decay of 0.021% per cycle, which is comparable to that of previously reported Mg–Se batteries using non-nucleophilic electrolytes. The excellent performance is attributed not only to the structural advantage of the material, but to the compatible electrolyte. Well trapped Sen chains in the polymer backbone facilitate electron/ion transport and improve reaction kinetics, leading to high reactivity and utilization of Se with suppressed shuttle effect. In addition, the polymer backbone could buffer the volume changes during the electrochemical process and mitigate the structural degradation. Furthermore, the effective SEI film preserves the cathode and prevents it from irreversible reaction with the electrolyte. This work proposes combining a conductive Se/PAN cathode and a compatible electrolyte to promote the performance of Mg–Se batteries, with a view to sparking intense research interest in Mg–Se batteries with easily prepared nucleophilic electrolytes.
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