SOLAR ENERGY
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2019
·
IF 4.674
Zhen Li,Libo Yu
Mn-Cd x Zn 1-x Se@ZnO multi-shelled (including single-shelled, double-shelled, and triple-shelled) hollow microspheres (HMS) were successfully synthesized for application in quantum dots sensitized solar cell (QDSSC). The influence of shell numbers on photovoltaic performance of QDSSC were investigated. The results showed that larger surface area, repeated light reflection and reinforced light scattering can be achieved with triple-shelled HMS, which can improve light harvesting efficiency. Furthermore, midgap state created by Mn-doping in Cd x Zn 1-x Se will facilitate electrons injection and collection from excited Cd x Zn 1-x Se quantum dots (QDs) to ZnO. The multi-shelled effects and Mn-doping finally improve the short-circuit current (J sc ) of Mn-Cd x Zn 1-x Se@ZnO tripled-shelled HMS solar cell to 20.21 mA cm −2 , leading to the power conversion efficiency significantly enhanced to 3.39%.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Juan Xia,Qi Wang,Miaomiao Chen,Wenwen Li,Jie Liu,Jitang Chen,Hai Wu,Suhua Fan
To avoid the evaporation and leakage of the liquid electrolyte and increase the long-term stability of the cell, a strategy was developed to construct bifacial dye-sensitized solar cells employing quasi-solid-state electrolyte (BQDSSCs). Two metal selenides with different morphologies, Co 0.85 Se, which has a foliate structure like the structure of graphene, and Ni 0.85 Se, which has uniform nanoparticle , were synthesized by a facile one-step hydrothermal method . The proposed BQDSSCs were then constructed using the TiO 2 photoanode, polyvinylidene fluoride gel electrolyte, and Co 0.85 Se or Ni 0.85 Se as the counter electrode (CE) electrocatalysts . Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization measurements were performed to investigate the electrochemical behavior of the Co 0.85 Se, Ni 0.85 Se, and Pt CEs. The results showed that the graphene-like Co 0.85 Se material exhibited better operational stability, greater charge-transfer ability, and higher electrocatalytic activity for the reduction of I 3 − than the Ni 0.85 Se nanoparticles. Furthermore, for the BQDSSCs, Co 0.85 Se yielded the highest power conversion efficiencies (PCE) of 8.33% and 4.79% under front and rear irradiations, respectively, in comparison with the front and rear efficiencies of 7.44% and 4.05% for Pt and 7.23% and 4.16% for Ni 0.85 Se CEs, respectively. The BQDSSC device based on the Co 0.85 Se CE exhibited good long-term stability with only a 5% drop in power conversion efficiency after 1000 h of one-sun soaking. Consequently, graphene-like Co 0.85 Se was considered to be an ideal material for constructing cost-effective BQDSSCs.
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高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 4
·506
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IF 4.034
Shuquan Chang,Xian Wu,Jianzhang Lan,Zheng Li,Xiaohong Zhang,Haiqian Zhang
Quantum dots (QDs) have attracted great attention due to their unique optical properties. High fluorescence efficiency is very important for their practical application. In this study, we report a simple and efficient strategy to enhance the photoluminescence of water-dispersed thiol-capped QDs using γ-radiation. Three kinds of QDs with different surface ligands and cores (MPA-CdTe, MPA-CdSe and Cys-CdTe) were fabricated and irradiated by high-energy γ-ray in an aqueous solution. Their photoluminescence intensities were significantly enhanced after irradiation, which were closely related to the radiation dose and the structure of QDs. The positions of the fluorescence emission peaks did not shift obviously after irradiation. The mechanism of photoluminescence enhancement was discussed based on the results of photoluminescence (PL) spectra, UV-visible light absorption (UV-vis) spectra, transmission electron microscope (TEM), X-ray diffraction (XRD) patterns, Fourier transform infrared (FT-IR) spectra and X-ray photoelectron spectroscopy (XPS). This method can be employed to uniformly treat large batches of QDs at room temperature and without other chemicals.Keywords:quantum dots;luminescence enhancement;γ-radiation;thiol-capped
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Li Tian,Xuerong Wang,Kexin Wu,Yue Hu,Yue Wang,Juan Lu
A ultrasensitive electrochemiluminescence (ECL) biosensor was designed for the detection of dopamine using ZnSe quantum dots and Ru(bpy) 3 2+ as the signal probes, and graphite oxide and multi-walled carbon nanotube as the supporting matrix. The biosensor exhibits efficient and stable anodic ECL signal (at 1.10 V vs. Ag/AgCl) in phosphate buffer solution (pH 9.0) containing Tripropyl amine. The ECL emission decreases with adding dopamine, which can be attributed to the quenching effect from interaction between ZnSe and dopamine. The possible reaction mechanism of the ECL system is studied, and a method for the determination of dopamine is proposed. Under the optimal experimental conditions, the ECL emission decreases linearly with the logarithm of dopamine concentration in a wide linear range from1 × 10 −9 to 1 × 10 -5 mol L −1 with a detection limit of 6 × 10 -10 mol L -1 (S/N = 3). The biosensor is also successfully applied to detect dopamine in human blood serum samples.
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高影响因子
Micro & Nano Letters
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2019
·Vol. 14
·期 8
·892-896
·
IF 0.975
Jiaqi You,Long Ma,Yu He,Yili Ge,Gongwu Song,Jiangang Zhou
This work has assembled ZnSe:Mn/ZnS quantum dots (QDs)-monoclonal anti-microcystin-Leucine Arginine (anti-MC-LR) antibody bioconjugates as a room temperature phosphorescence (RTP) probe using 1-ethyl-3-(3-dimethyllaminopropyl) carbodiimide/N-Hydroxysuccinimide chemistry for detecting MC-LR. Once the specific interactions occurred between these MCs and their antibodies on the surface of ZnSe:Mn/ZnS QDs, the RTP of ZnSe:Mn/ZnS QDs was quenched with the increased concentration of MC-LR. Under the optimised conditions, the linear range of MC-LR was determined to be 0.9–8.8 nM. The linear relationship between ( P 0 – P )/ P 0 and concentration of MC-LR were observed with the regression equation ( P 0 – P )/ P 0 = 0.03908C + 0.0456 with the detection limit of 0.038 nM. The developed RTP immunoassay favoured environmental applications since the interference from autofluorescence and scattering light was greatly eliminated.
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高影响因子
ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Zhongyuan Guan,Fei Chen,Zhenyang Liu,Peiwen Lv,Mingjun Chen,Mingxuan Guo,Xu Li,Feng Teng,Song Chen,Aiwei Tang
For quantum-dot light-emitting diodes (QD-LED), replacing Cd-based II-VI nanocrystals (NCs) with the Cu-In-Zn-VI counterparts combines the consideration of environmental benignity and device performance. To prove this concept, the chemical composition and nanostructures of Cu-In-Zn-VI nanocrystals need to be thoroughly explored aiming to competitive optoelectronic properties. Herein, we reported a detailed study of Cu–In–Zn–Se–S synthesis and demonstrated how the optical bandgap, emission full width at half-maximum (FWHM) and the performance of QD-LED were tuned by simply changing the dose of precursors in a non-injection synthesis. Evident by optical absorption , the optimization of Se and Cu doses enabled good dispersity and desired emission wavelength . Further analysis of photo-electron spectroscopy revealed the chemical composition from core to surface favored soft confinement of exciton by gradually increasing the loading of Zn element. Finally, we successfully demonstrated solution-processed QD-LEDs with the best external quantum efficiencies as high as 4.2% and emission wavelength centering at 663 nm. To our best knowledge, this is the most efficient solution-processed red QD-LED based on Cu-In-Zn-VI nanocrystals.
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高影响因子
Journal of Materials Chemistry C
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2019
·Vol. 7
·期 15
·4459-4465
·
IF 6.641
Yang-Jie Lin,Bin-Wen Liu,Run Ye,Xiao-Ming Jiang,Long-Qi Yang,Hui-Yi Zeng,Guo-Cong Guo
Two new infrared (IR) nonlinear optical (NLO) chalcogenides, SrCdSnQ4 (Q = S and Se) (1 and 2), were obtained by mixing NLO-active metal chalcogenides and d10 metal tetrahedral motifs in an alkali metal-containing system. Their structures are constructed with edge- and corner-sharing CdQ4 and SnQ4 (Q = S and Se) units to form two-dimensional (CdSnQ4)2− layers, between which are embedded with Sr2+. Compounds 1 and 2 have moderate band gaps of 2.05 and 1.54 eV, respectively. They exhibit strong second-harmonic generation intensities that are comparable to that of the benchmark AgGaS2 using a 2040 nm laser. Furthermore, their laser-induced damage thresholds are 10 and 5 times higher than that of AgGaS2, respectively. The strong NLO efficiency of these two compounds can be ascribed to SnQ4 tetrahedra with a synergetic enhancement in the large distortion of CdQ4 tetrahedra, shedding light on the exploration of new IR NLO materials with mixed NLO-active and synergetic distorted motifs.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Ning Jia,Mengqi Zhang,Bo Li,Chuanchuan Li,Yangyang Liu,Yupeng Zhang,Tongtong Yu,Yang Liu,Deliang Cui,Xutang Tao
Ternary chalcogenides have drawn intense interest as promising alternative anode materials for Li-storage systems benefiting from their high specific capacity. Herein, the electrochemical performance of a new ternary chalcogenide LiInSe 2 used for lithium ion anode has been reported for the first time. Furthermore, in view of carbon-coating treatment, the optimized anode LiInSe 2 @C for Li-ion batteries exhibits enhanced capacitive behavior and high rate capability. LiInSe 2 @C presents a high reversible capacity of 409.1 mA h g −1 at 100 mA g −1 and a reversible capacity of 270 mA h g −1 after 1000 cycles at 1000 mA g −1 . Further analyses evidence that the outstanding rate performance stems from fast electrochemical kinetics, enhanced by the pseudocapacitive effect and improved electronic/ionic conductivity. These results elucidate the attractive lithium storage performance of LiInSe 2 compound, and would offer a practical polestar to explore novel ternary chalcogenide for energy storage.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Linghui Zhao,Jingchun Jia,Ying Chang,Meilin Jia,Zhenhai Wen
It is vital to develop a high activity, stability and inexpensive hydrogen evolution reaction (HER) catalyst for electrochemical hydrogen evolution. A high-temperature reaction approach that is Co nanocrystals on carbon support (XC-72R) and selenylation to synthetize CoSe 2 /C nanocrystals is used, and the effect of temperature on CoSe 2 /C nanocrystals is studied. The morphology and catalytic properties of CoSe 2 /C nanocrystals annealed at different temperatures are compared in 0.5 M H 2 SO 4 . The results indicated the coralline-like CoSe 2 /C-650 nanocrystals have a high performance for HER with Tafel slopes of 45.73 mV·dec −1 and onset potential of −196 mV vs. RHE. The stability maintained for at least 40 h and the Faraday Efficiency (FE) of H 2 is nearly 98%. The outstanding HER performance of CoSe 2 /C-650 is due to its characteristic cora-like frame CoSe 2 nanocrystals embedded into supernal conductive XC-72R, which not only offer affluent active reaction sites, but also boost the capacity of charge transportation in HER process.
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高影响因子
Solar RRL
·
2019
·Vol. 3
·期 10
·1900131
·
IF 0
Afei Zhang,Zhengji Zhou,Wenhui Zhou,Dongxing Kou,Yuena Meng,Yafang Qi,Shengjie Yuan,Sixin Wu
A back contact interface in a kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) photovoltaic device plays an important role in fabricating high quality semiconducting photoactive layers and improving carrier extraction efficiency. However, uncontrolled decomposition reactions between the CZTSSe absorber layer and Mo electrode result in high series resistance and recombination at the back interface. The insertion of high work function MoO 3 as an interfacial layer is considered as a promising way to engineer the back contact. This highlights the importance of elucidating the chemistry and dynamics of MoO 3 at the Mo/kesterite interface in the CZTSSe annealing process. Herein, A detailed investigation of the elemental diffusion and chemistry of the back contact with the MoO 3 intermediate layer during selenization is carried out. The results demonstrate that the presence of the MoO 3 interfacial layer largely suppresses the chemical reaction between Mo and CZTSSe in the annealing process, inducing high quality CZTSSe absorbing films with fewer voids and reducing the thickness of MoSe 2 from 209 to 84 nm when the optimized thickness of MoO 3 is 10 nm. This finally leads to the increase in device efficiency from 9.02% to 10.92%, and the best performance where an efficiency of 11.37% is achieved.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xianbiao Hu,Qingwei Zhou,Pengfei Cheng,Shaoqiang Su,Xin Wang,Xingsen Gao,Guofu Zhou,Zhang Zhang,Junming Liu
Constructing earth-abundant and efficient electrocatalysts for overall water splitting are still in the research and exploration stage. In this work, the Fe-doped NiSe 2 polyhedron nanocrystals grown on Ni foam (Ni 0.75 Fe 0.25 Se 2 @NF) with controllable surface morphology are developed as high-performance bifunctional electrocatalysts. The surfaces of the optimized polyhedron nanocrystals provide high density of catalytic active sites. NiSe 2 is originally a catalytic active substance, and the Fe doping in NiSe 2 can greatly enhance the conductivity. The optimized Ni 0.75 Fe 0.25 Se 2 @NF (6 h) electrode are performed in an alkaline solution, exhibiting outstanding OER and HER activity with small overpotentials of 210 mV and −117 mV to reach current density of 10 mA cm −2 and −10 mA cm −2 , respectively. Remarkably, the Ni 0.75 Fe 0.25 Se 2 @NF (6 h) electrode serve as cathode and anode in water splitting electrolyzer also demonstrates highly efficient overall water electrolysis performance, with a relatively low cell voltage of 1.61 V at 10 mA cm −2 (1.57 V for RuO 2 (+)//Pt/C(−) couple) and excellent long-term stability of 50 h for overall water electrolysis.
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高影响因子
PHYSICS LETTERS A
·
2019
·
IF 2.087
Manman Yang,Hongyu Zhu,Wencai Yi,Shangsheng Li,Meihua Hu,Qiang Hu,Baoli Du,Xiaobing Liu,Taichao Su
In this paper, p-type thermoelectric material Te–Se solid solutions have been successfully prepared by the high-pressure technique. The thermal conductivity of Te was depressed sharply by Se alloying. An extremely low thermal conductivity ∼0.27 W m −1 K −1 was obtained for Te alloyed with 15 mol% Se, which near the theoretical minimum, κ min . The bipolar diffusion effect of Te was suppressed by Se alloying due to the increased band gap, which lead to enhanced Seebeck coefficient and depressed bipolar diffusion thermal conductivity under high temperature. The maximum figure of merit, ZT of 0.37 at 480 K was obtained for Te alloyed with 5 mol% Se, which is about twice higher than that of pristine Te.
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高影响因子
危险品化学品经营许可证（带存储）