Physica Status Solidi-Rapid Research Letters
·
2018
·Vol. 12
·期 6
·1800025
·
IF 3.721
Chunfeng Lan,Guangxing Liang,Huabin Lan,Huanxin Peng,Zhenghua Su,Dongping Zhang,Huibin Sun,Jingting Luo,Ping Fan
Antimony sulfide (Sb 2 S 3 ) thin film is a promising light absorber for solar cell application due to its suitable bandgap, high absorption coefficient, and non-toxic constituents. However, thermally evaporated Sb 2 S 3 thin films experience sulfur loss during evaporation and post-annealing, which do harm to the film quality and the performance of the devices. In this work, for the first time Sb 2 S 3 thin films are prepared by thermally evaporating antimony pentasulfide (Sb 2 S 5 ) precursor. The thermal and microstructural properties of Sb 2 S 3 and Sb 2 S 5 precursors are studied and compared. The crystallization of the Sb 2 S 3 film (S-5) prepared from Sb 2 S 5 precursor is inferior to that (S-3) from Sb 2 S 3 powder. And the annealed S-5 film shows a larger bandgap of 1.69 eV than S-3. However, compared with S-3, planar S-5 thin film solar cells in the configuration of glass/(SnO 2 :F) FTO/TiO 2 /Sb 2 S 3 /Spiro-OMeTAD/Ag exhibit an apparently improved photovoltaic performance, with the best power conversion efficiency of 3.75% and high fill factor of 0.56, which is the highest efficiency of thermally evaporated planar Sb 2 S 3 solar cell. The capacitance–voltage ( C–V ) measurement indicates that this might come from the higher C–V derived space-charge density in S-5. This work offers a new method to prepare Sb 2 S 3 thin films for efficient solar cells.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2013
·Vol. 36
·期 7
·1263-1269
·
IF 2.591
Qian Zhang,Tao Liang,Lili Guan
A simple and economical method for the determination of eight polybrominated diphenyl ethers (BDE-28, 47, 99, 100,153,154,183, and 209) in water was developed. This method involves the use of ultrasound-assisted dispersive liquid–liquid microextraction combined with GC-MS in negative chemical ionization mode. Various parameters affecting the extraction efficiency, including the type and volume of extraction and dispersive solvents, salt concentration, extraction time, and ultrasonic time, were investigated. A volume of 1.0 mL of acetone (dispersive solvent) containing 10 μL tetrachloroethylene (extraction solvent) was injected into 5.0 mL of water samples and then emulsified by ultrasound for 2.0 min to produce the cloudy solution. Under the optimal condition, the enrichment factors for the eight PBDEs were varied from 845- to 1050-folds. Good linearity was observed in the range of 1.0–200 ng L −1 for BDE-28, 47, 99, and 100; 5.0–200 ng L −1 for BDE-153, 154, and 183; and 5.0–500 ng L −1 for BDE-209. The RSD values were in the range of 2.5–8.4% ( n = 5) and the LODs ranged from 0.40 to 2.15 ng L −1 (S/N = 3). The developed method was applied for the determination of eight BPDEs in the river and lake water samples, and the mean recoveries at spiking levels of 5.0 and 50.0 ng L −1 were in the range of 70.6–105.1%.
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PubMed
高影响因子
MACROMOLECULAR RESEARCH
·
2012
·Vol. 21
·期 6
·681-686
·
IF 1.153
Xu Yewei,Tang Jie,Chang Guanjun,Zhu Fanghua,Luo Xuan,Zhang Lin
Poly( N -arylenebenzimidazole ketone ketone)s (PNABIKKs) consisting of m - and p -phenylene linkages have been synthesized by nucleophilic aromatic substitution from bis(benzimidazolyl) derivatives containing sulfonyl, carbonyl, and ether groups with activated aromatic difluorides in sulfolane at 210 °C in the presence of anhydrous potassium carbonate. The structures of the polymers were characterized by means of Fourier tramsfom infrared (FTIR), proton nuclear magnetic resonance ( 1 H NMR) spectroscopy, and elemental analysis, and the results were largely consistent with the proposed structure. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) measurements demonstrated that polymers had high glass transition temperatures ( T
g
>220 °C) and good thermal stability with high decomposition temperatures ( T
D
>480 °C). These novel polymers also showed good solubility.
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RSC Advances
·
2014
·Vol. 4
·期 87
·46689-46696
·
IF 3.708
Wei-fang Chen,Ling Pan,Li-fang Chen,Qiong Wang,Chang-cheng Yan
Nano zero-valent iron (nZVI) and activated carbon composites were synthesized and employed to remove hexachlorobenzene (HCB). Methods of impregnation and adsorption were employed to firstly load iron salt onto activated carbon, and thus loaded iron was then reduced to form zero valent iron. Results indicate that the method of iron loading significantly impacted the amount of iron and HCB dechlorination. In general, nZVI/activated carbon composite synthesized using an adsorption method showed considerably higher removal efficiency and dechlorination capability. More than 80% of the HCB was dechlorinated after 48 h. The dechlorination of HCB followed a stepwise pathway: HCB (hexachlorobenzene) → PCB (pentachlorobenzene) → 1,2,4,5 TeCB (tetrachlorobenzene) → TriCB (trichlorobenzene) → 1,4 DCB (dichlorobenzene) → MCB (monochlorobenzene). Compared with activated carbon or nZVI, nZVI/activated carbon composite showed much higher HCB removal. Analysis of mass partition on solid and aqueous phases indicates that most of the HCB and its dechlorination intermediates were retained on solids probably due to the strong adsorption on activated carbon. In summary, activated carbon performs three important functions: it alleviated the limitation of nZVI agglomeration, contributed to HCB removal due to its own adsorption capability and increased the resistance of nZVI against pH change.
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高影响因子
HIGH PERFORMANCE POLYMERS
·
2014
·
IF 1.09
Yewei Xu,Yi Sun,Yonglin Lei,Jichuan Huo,Lin Zhang
Poly(N-arylenebenzimidazole ketone ketone pyridine)s have been prepared via N–C coupling reaction that removed the N–H sites from the novel bis(benzimidazoyl) derivatives with activated aromatic difluorides in sulfolane. The reaction was carried out at 210°C in the presence of anhydrous potassium carbonate. The structures of the polymers were characterized by means of Fourier transform infrared and proton nuclear magnetic resonance spectroscopies and elemental analysis. All resulting polymers showed essentially amorphous patterns. Differential scanning calorimetry and thermogravimetric measurements showed that the polymers had high glass transition temperatures (>179°C), good thermostability, and high decomposition temperatures (>401°C). These novel polymers also showed easy solubility.
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高影响因子
FLUID PHASE EQUILIBRIA
·
2015
·
IF 2.2
Yinchuan Pei,Qinbo Wang,Xing Gong,Fuqiong Lei,Binwei Shen
Liquid–liquid equilibrium (LLE) data for ternary systems water + cyclohexane + cyclohexanol and water + cyclohexane + cyclohexanone were measured at (303.2–333.2) K and under atmospheric pressure. The reliability of the experimental tie-line data was checked by the empirical Othmer–Tobias correlation. The distribution coefficient and separation factor were used to investigate the distribution of cyclohexanol and cyclohexanone between water and cyclohexane. The results show that the distribution coefficient of cyclohexanol or cyclohexanone between organic and aqueous phases increases with the increasing content of cyclohexanol or cyclohexanone in water, and so does it with the increasing of temperature. By using the NRTL and UNIQUAC activity coefficient models, the experimentally determined LLE data, along with the LLE data for another ternary system water + cyclohexanol + cyclohexanone [G. Xing, W. Qinbo, L. Fuqiong, S. Binwei, J. Chem. Eng. Data 59 (2013) 1651–1655], were correlated simultaneously. Good agreements were obtained between the correlated and experimentally determined tie-line data. The binary NRTL and UNIQUAC interaction parameters were obtained. Furthermore, four sets of quaternary LLE data for water + cyclohexane + cyclohexanol + cyclohexanone were experimentally determined at 318.2 K. The experimentally determined quaternary LLE data were compared with the NRTL model predicted LLE data, and generally agreements were obtained. It further verifies the reliability of the obtained binary model parameters, and indicates the obtained parameters could be used for prediction, as well as design and optimization of the related separation process.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2015
·Vol. 38
·期 16
·2880-2886
·
IF 2.737
Xi Zhang,Xiaohuan Zang,Guijiang Zhang,Chun Wang,Zhi Wang
A mesoporous carbon was fabricated using MCM-41 as a template and sucrose as a carbon source. The carbon material was coated on stainless-steel wires by using the sol–gel technique. The prepared solid-phase microextraction fiber was used for the extraction of five volatile aromatic compounds (chlorobenzene, ethylbenzene, o -xylene, bromobenzene, and 4-chlorotoluene) from tea beverage samples (red tea and green tea) prior to gas chromatography with mass spectrometric detection. The main experimental parameters affecting the extraction of the volatile aromatic compounds by the fiber, including the extraction time, sample volume, extraction temperature, salt addition, and desorption conditions, were investigated. The linearity was observed in the range from 0.1 to 10.0 μg/L with the correlation coefficients ( r ) ranging from 0.9923 to 0.9982 and the limits of detection were less than 10.0 ng/L. The recoveries of the volatile aromatic compounds by the method from tea beverage samples at spiking levels of 1.0 and 10.0 μg/L ranged from 73.1 to 99.1%.
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高影响因子
HIGH PERFORMANCE POLYMERS
·
2015
·
IF 1.286
Yewei Xu,Yi Sun,Yonglin Lei,Jichuan Huo,Lin Zhang
This article presents a convenient polymerization route to synthesize poly(arylene ether)s containing N-arylenebenzimidazolyl groups. The novel polymers were prepared by a catalyst-free nucleophilic substitution reaction, in which the N–H and O–H sites were removed from 2-(2-hydroxyphenyl)-1H-benzimidazole with different activated difluorides containing carbonyl groups in sulfolane. The reaction was carried out in the presence of anhydrous potassium carbonate at 210°C. The structures of the polymers were characterized using Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and elemental analysis. The results show good agreement with the proposed structure. All resulting polymers show essentially amorphous patterns. Moreover, differential scanning calorimetry and thermogravimetric measurements show that the polymers have high glass transition temperatures (>209°C), good thermostability, and high decomposition temperatures (>425°C). Furthermore, the polymers also exhibit excellent solubility in common organic solvents.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2013
·
IF 2.004
Fuqiong Lei,Qinbo Wang,Xing Gong,Binwei Shen,Bingyan Mao,Xiang Ye
Liquid–liquid equilibrium (LLE) data for the ternary system water + cyclohexane + acetic acid have been measured at (303.2 to 333.2) K under atmospheric pressure. The Othmer–Tobias and Bachman equations were used to check the reliability of the obtained tie-line data. The experimental data were correlated by NRTL (nonrandom two-liquid) activity coefficient model, and the relevant interaction parameters were regressed with the experimental data. The predicted values by NRTL method show good consistency with the measured data. The obtained interaction parameters can be used in the calculation of LLE for the ternary system water + cyclohexane + acetic acid as well as for the design and optimization of the related separation process.
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Materials Today Energy
·
2017
·
IF 0
Wangen Zhao,Dong Yang,Zhou Yang,Shengzhong (Frank) Liu
The high efficiency and low-toxicity are the two main objectives for all perovskite solar cells (PSCs) towards large scale commercialization. Herein, ecology-benign Zn was introduced to partially replace the noxious Pb in the typical Pb-based perovskite absorber layer owing to its low-toxicity, high-richness in the crust, suitable valence states, and good stability against oxidation and reduction. It is found that the addition of Zn with a certain amounts significantly improves the crystalline quality, enlarges the grain sizes in the perovskite thin films , reduces the non-radiative recombination loss and lengthens the carrier lifetime, leading to the improved photovoltaic performance and eliminated hysteresis. It is demonstrated that Zn doping is an effective strategy to replace Pb to achieve superior solar cell performance with reduced Pb usage.
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CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Yuwei Pan,Minghua Zhou,Xiang Li,Liting Xu,Zhuoxuan Tang,Xuejie Sheng,Bing Li
Highly efficient persulfate oxidation process activated with pre-magnetization Fe 0 (pre-magnetization Fe 0 /PS) was employed to degrade Orange anthraquinone dye at different Fe 0 dosages (1–8 mmol/L), initial pH levels (3–10) and PS dosages (2–8 mmol/L). Pre-magnetization Fe 0 /PS possessed 8.4–119.6 folds enhancement in degradation rate and could widen pH range and save 90% Fe 0 and PS dosage when compared with conventional Fe 0 /PS process. And this effect was ascribed to the change of Fe 0 characteristics after pre-magnetization. This significant improvement was also observed on the degradation of many refractory contaminants of tartrazine, phenol, 2,4-dichlorophenol (2,4-DCP), p -chlorophenol, chlorobenzene, nitrobenzene, p -nitrophenol and p -nitrchlorobenzene, which were 2.8–11.4 folds of those by Fe 0 /PS process. Pre-magnetization Fe 0 /PS is a more promising process since it does not require any change of the present water and wastewater treatment process, and does not need an extra energy source, costly materials, and complex equipment.
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Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 21
·8374-8383
·
IF 8.262
Liangbin Xiong,Minchao Qin,Guang Yang,Yaxiong Guo,Hongwei Lei,Qin Liu,Weijun Ke,Hong Tao,Pingli Qin,Songzhan Li,Huaqing Yu,Guojia Fang
Mg doping into high temperature processed (HTP) SnO2 as an electron selective layer (ESL) significantly improves perovskite solar cell (PSC) performance including power conversion efficiency (PCE), open circuit voltage, short circuit current (JSC) and fill factor. An optimum Mg content (7.5%) affords a uniform, smooth and dense Mg-doped SnO2 film with high electron mobility and its corresponding PSC displays less hysteresis and achieves a highest steady-state PCE of 14.55%, nearly 92.8% enhancement compared to that with undoped SnO2. Electrical measurements show that suitable Mg doping dramatically reduces free electron density and substantially increases the electron mobility of pristine SnO2. The mechanism of efficiency enhancement for PSCs is proposed as follows: the low free electron density causes suppression of carrier recombination and high electron mobility facilitates fast extraction of electrons from perovskite to ESLs, contributing to an improved JSC. Impedance analysis strongly supports the proposed mechanism and reveals that the higher is the electron mobility, the higher is the electron collection efficiency, and the higher are the JSC and PCE. The HTP SnO2 with a suitable Mg content can be an excellent ESL for PSCs and might well be a suitable candidate of ESLs for CdTe, CuInGaSe and other photovoltaic devices involved in HTP treatment.
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