JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 25
·11167-11176
·
IF 3.553
Zhang Jiyun,Song Yanyan,Dong Xianhui,Jiang Haoyang,Tang Jianguo,Li Haidong
We, herein, report the synthesis of umbrella-like CdS single crystal with exposed high-activity (002) facets first time by using a one-step hydrothermal method with cadmium acetate dihydrate (Cd(CH 3 COO) 2 ·2H 2 O) and ammonium thiocyanate (NH 4 SCN), and its possible growth mechanism was discussed. As a contrast, CdS nanoparticles with different morphologies were also synthesized. The morphology, composition and photocatalytic property of as-synthesized samples were determined by XRD, SEM, TEM, UV–Vis DRS, PL and photocurrent tests, respectively. The results show that umbrella-like CdS under UV (20 min) and visible light (80 min) irradiation, the removal rate of rhodamine B was as high as 99.1% and 99.3%, respectively. Moreover, even though the particle size of umbrella-like CdS particle is larger than as-synthesized CdS nanospheres, it still shows excellent photocatalytic degradation activity due to its exposed high-energy (002) facets. And its excellent application prospects are conceivable. The current work provides a new paradigm in material morphology design, especially in the construction of highly active surfaces for photocatalysis and photoelectric conversion.
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 11
·6175-6188
·
IF 4.21
Yu Haitao,Xue Zhimin,Lan Xue,Liu Qiaoling,Shi Ruifen,Mu Tiancheng
Abstract Development of efficient solvents to dissolve lignocellulose and its main components is of significant importance for the utilization/transformation of lignocellulose. Herein, several ionic liquid (IL)-based deep eutectic solvents (DESs) were prepared using four ILs as the hydrogen bond acceptors and four different hydrogen bond donors, including thiourea (TU), N-methylthiourea (NMTU), glycerol (Gly), and ethylene glycol (EG). Using the dissolution of xylan (a typical type of hemicellulose) as the example, it was observed that the synthesized IL-based DESs could efficiently dissolve xylan. Especially in the DES formed from 1-allyl-3-methylimidazolium chloride and EG, the xylan solubility could reach as high as 40.4 wt% at 343.15 K. More importantly, the solubility of xylan in IL-based DESs was much higher than that in the corresponding IL. The enhancement effect might be ascribed to that the formation of DESs could significantly decrease the viscosity and increase the hydrogen bond accepting ability. Additionally, the regeneration of the xylan from the DESs could be easily realized using ethanol as the anti-solvent, and the regenerated xylan kept a high consistency with the original xylan. Graphic abstract Ionic liquid-based deep eutectic solvents were designed for highly efficient dissolution of xylan owing to the decreased viscosity and the increased hydrogen-bond accepting ability.
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Ting Chen,Yanqiao Xu,Zhixiang Xie,Lianjun Wang,Weihui Jiang,Wan Jiang
I–III–VI quantum dots (QDs), as a new class of light-emitting materials, have aroused a great of attention for an impressive variety of applications. A facile one-pot approach was employed to synthesize highly luminescent Cu–In–Zn–S/ZnS (CIZS/ZnS) core/shell QDs. It was found that the CIZS/ZnS QDs prepared using sodium sulfide as sulfur source exhibited the strongest emission due to its highest chemical reactivity as compared to thiourea and thioacetamide. The combination of GSH content and pH value played a crucial role in the growth of ZnS shell, which was responsible for the bright emission of QDs. The surface defects of QDs could be effective passivated by GSH, which exhibited a significant improvement of emission intensity. The optimum pH value of 7 was also established due to the fact that the deprotonized sulfhydryl group of GSH molecule strongly coordinated with Zn 2+ at neutral pH value. Moreover, the particle size and composition of the CIZS/ZnS QDs can be well adjusted by tuning the n Zn / n CuInZn ratios. The maximum quantum yield (QY) of CIZS/ZnS QDs increased from 5.95% to 26.12%, accompanying by the improvement of the radiative decay rate from 1.90 × 10 5 to 5.64 × 10 5 s −1 . Furthermore, a blue LED-pumped white light-emitting diode (WLED) device was realized by combining yellow-orange CIZS/ZnS QDs with green Lu 3 Al 5 O 12 :Ce 3+ phosphor, achieving a luminous efficacy (LE) of 66.9 lm/W, and color rendering index (CRI) of 87.2, which demonstrated their great application potential in solid-state lighting field.
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2020
·Vol. 22
·期 11
·3597-3607
·
IF 9.48
Hai-Qin Xiao,Wen-Hui Zhou,Dong-Xing Kou,Zheng-Ji Zhou,Yue-Na Meng,Ya-Fang Qi,Sheng-Jie Yuan,Qing-Wen Tian,Si-Xin Wu
Cu2ZnSn(S,Se)4 (CZTSSe) solar cells have been receiving considerable attention in recent years, owing to their low cost and toxicity as well as a high abundance of their constituent elements. Solution-based (mainly precursor solution) methods have been widely used in the fabrication of CZTSSe-based thin film solar cells. Though most record solar cells since 2009 have been achieved using solution-based methods, carbonaceous residues are always formed during post deposition treatment (PDT). These carbonaceous residues are detrimental to grain growth of CZTSSe to form large grains. The presence of unwanted small grain layers will increase the series resistance and reduce the fill factor of the solar cell, thus consequently decreasing the efficiency of CZTSSe solar cells. Herein, we propose “green” supercritical carbon dioxide (SCCO2) treatment to overcome the challenge of carbonaceous residues. FT-IR, SEM, XRD and Raman characterization studies were used to confirm the reduction of carbonaceous residues in CZTSSe films. The solar cell fabricated from a selenized CZTSSe precursor film with SCCO2 treatment under optimal conditions showed the best conversion efficiency of 11.23% (VOC = 0.456 V, JSC = 36.6 mA cm−2, FF = 67.1%). To the best of our knowledge, this is the first report on boosting the efficiency of solution-based CZTSSe solar cells by using SCCO2 treatment. In addition, this unique SCCO2 treatment may also bring forth new ideas for other solution-based optoelectronic devices.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Guang-Ya Hou,Zi-Ye Lyu,Yi-Ping Tang,Hua-Zhen Cao,Guo-Qu Zheng
In this study, carbon aerogel (CA) were obtained by inexpensive bacterial cellulose (BC) hydrogel freeze-dried and carbonized under N 2 atmosphere. Then nickel sulfide (NiS)/CA composite aerogel electrodes with different contents were successfully prepared by a one-step solvothermal method . The morphology, phases and surface electronic state of these electrodes were characterized by SEM/TEM, XRD and XPS , respectively, and their electrocatalytical properties for methanol oxidation were investigated by cyclic voltammetry (CV) in the alkaline media of methanol. The NiS particles dispersed uniformly on CA, and the obtained material maintained the reticulated porous structure of BC. The methanol oxidation peak current density of CNS-0.5 at 0.8 V reached 43 mA/cm 2 (263 mA/mg). After 1000 cycles, the peak current density retained 92% of the initial state. The composite electrode has good catalytic activity and good cycle performance for methanol catalysis. Nickel sulfide with high crystallinity transforms to nickel oxide with low crystallinity after a long cycle test, which results in excellent cycle performance of the composite. NiS/CA electrodes have the potential for application in portable or wearable devices .
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Shuo Geng,Weiwei Yang,Yequn Liu,Yongsheng Yu
Engineering sulfur vacancies in the basal plane of MoS 2 is an effective method to enhance its catalytic activity. However, the traditional methods are only effective for multilayer or monolayer MoS 2 supported on the substrate (such as Si/SiO wafer or carbon paper), which are not applied in bulk or commercial MoS 2 . In this work, we developed a simple and general chemical reduction method for engineering S-vacancies in the MoS 2 basal plane and additional active edge sites, which can be exploited to improve the HER catalytic performance of MoS 2 . The optimized MoS 2 nanosheets with S-vacancies exhibit excellent HER activity with a small overpotential of 190 mV at large density of 10 mA/cm 2 and a low Tafel slope of 54 mV decade −1 . Moreover, prominent electrochemical durability was also achieved. This finding proposes an effective strategy to fabricating S-vacancies for activating basal plane of 2D transition metal chalcogenides materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Jincai Wang,Jialiang Guo,Haowen Chen,Xiaoling Huang,Govert W. Somsen,Fenyun Song,Zhengjin Jiang
A single-step copolymerization strategy was developed for the preparation of carbohydrate (glucose and maltose) functionalized monoliths using click reaction. Firstly, novel carbohydrate-functionalized methacrylate monomers were synthesized through Cu(I)-catalyzed 1,3-dipolar cycloaddition (alkyne-azide reaction) of terminal alkyne with azide of carbohydrate derivatives. The corresponding carbohydrate functionalized monolithic columns were then prepared through a single-step in-situ copolymerization. The physicochemical properties and performance of the fabricated monolithic columns were evaluated using scanning electron microscopy, Fourier-transform infrared spectroscopy, and nano-liquid chromatography. For the optimized monolithic column, satisfactory column permeability and good separation performance were demonstrated for polar compounds including nucleoside, phenolic compounds and benzoic acid derivatives. The monolithic column is also highly useful for selective and efficient enrichment of glycopeptides from human IgG tryptic digests. This study not only provided a novel hydrophilic column for separation and selective trapping of polar compounds, but also proposed a facile and efficient approach for preparing carbohydrate functionalized monoliths.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2020
·
IF 5.339
Jingju Liu,Xiaoyan Lin,Mimi Sun,Bing Du,Lei Li,Jing Bai,Ming Zhou
The flower-like porous In 2 O 3 pompon assembled from two-dimensional (2D) nanosheets was synthesized through a simple thiourea-assistant hydrothermal method following the annealed process. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images manifest that the In 2 O 3 pompon possesses a clear porous structure with a nanosheet thickness of about 37.5 nm. Further, we compare the performance of intermediate products (In 2 S 3 , In 2 S 3 /In 2 O 3 ) and In 2 O 3 nanostructures as ethanol detection gas sensors. The fabrication of In 2 O 3 -based sensors exhibits enhanced ethanol sensing performance than that of In 2 S 3 /In 2 O 3 -based and In 2 S 3 -based sensors, which is mainly attributed to more chemical oxygen and oxygen vacancies on the material surface. The In 2 O 3 -based sensors for ethanol detection revealed a wide linear range from 2 ppm to 100 ppm, meanwhile the corresponding detection limits (LOD) as low as ~0.4 ppm at 260 °C. And the In 2 O 3 -based sensors also exhibit superior repeatability and reliable selectivity. The simple fabrication strategy of 2D nanosheets-assembled flower-like In 2 O 3 porous pompon may facilitate other ethanol gas sensors production and other 2D metal oxide semiconductor materials-based sensors preparation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Jialin Ma,Hengdong Ren,Zhenying Liu,Jun Zhou,Yueqin Wang,Biao Hu,Yin Liu,Ling Bing Kong,Tianshu Zhang
A microwave absorber of MoS 2 -PANI with three-dimensional spherical structure was synthesized. The absorber was prepared by one-step hydrothermal strategy of a two-dimensional nanoflower-like MoS 2 and in-situ oxidation polymerization reaction with an aniline monomer under ice bath conditions. It can be clearly seen from the SEM characterization that the structure of this three-dimensional MoS 2 -PANI microwave absorber is composed of a soft flower-like MoS 2 as a carrier and a successful intercalation of two-dimensional nano-rod PANI . The effects of aniline monomer, initiator and molybdenum disulfide on the microwave absorption properties of MoS 2 -PANI nanocomposites were investigated by adjusting different mass ratios. The results show that the optimized reflection loss (RL) of the MoS 2 -PANI nanocomposites after interlayer is −59.78 dB, a matching thickness of 3.44 mm and an effective absorption frequency range of 6.56–9.68 GHz (RL < -10 dB), covering C-Band and X-band. The outstanding microwave absorption performance of the MoS 2 -PANI nanocomposites is attributed to three factors, including enlarged specific surface area, reduced particle size and increased electrical conductivity .
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2020
·
IF 5.339
Ruijin Zeng,Dianping Tang
Herein a versatile photoelectrochemical (PEC) immunoassay platform for sensitive and specific screening of tumor biomarkers (carcinoembryonic antigen; CEA) was innovatively designed using hollow cadmium sulfide (H–CdS) as photoactive matrix based on immunomagnetic separation. Experimental results reveal that the hollow-structure prepared by template hydrothermal-etching method endowed the CdS with better photocurrent intensity compared to the traditional CdS nanoparticles . Upon addition of target CEA, a sandwiched immunoreaction was carried out between anti-CEA capture antibody-conjugated immunomagnetic bead (IMB) and horseradish peroxidase (HRP)-labeled anti-CEA detection antibody, accompanying the immunocomplex formation of the IMB-antibody/CEA/HRP-labeled antibody (IMB-CEA-HRP). Followed by magnetic separation, the carried HRP on the sandwich structure triggers enzymatic bioetching of H–CdS, thus resulting in decreasing photocurrent intensity. The H–CdS-based PEC sensing system exhibited satisfying photocurrent responses toward target CEA within the working range from 0.02 ng mL −1 to 50 ng mL −1 at a low detection limit of 6.12 pg mL −1 . Combined with magnetic immunoassay, this sensing platform has the advantages of high precision, great anti-interference ability, and acceptable accuracy. Overall, this research not only provides an efficient strategy for the activity of CdS with a well-defined hollow-nanostructures but also sheds light on the development of enzyme-triggered bioetching technology for traditional PEC immunoassay.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2020
·
IF 5.339
Chengji Sui,Qian Wang,Yunlei Zhou,Dingding Zhang,Huanshun Yin,Shiyun Ai
A sensitively homogeneous electrochemiluminescence (ECL) method was developed for 5-hydroxymethylcytosine (5hmC) detection using TiO 2 /MoS 2 /g-C 3 N 4 /GCE as substrate electrode, where g-C 3 N 4 was employed as the ECL active material, the MoS 2 nanosheets were used as co-catalyst, and TiO 2 was adopted as phosphate group capture reagent. To achieve the specific recognition and capture of 5hmC, the covalent reaction between –CH 2 OH and –SH was employed under the catalysis of HhaI methyltransferase, in which, –SH functionalized ferrocenedicarboxylic acid polymer (PFc-SH) was prepared as 5hmC capture reagent and ECL signal quencher. Then, based on the interaction between TiO 2 and phosphate group of 5hmC, the target was recognized and captured on electrode, resulting in a decreased ECL response due to the quenching effect of PFc-SH. Under optimal conditions, the biosensor presented the linear range from 0.01 to 500 nM with the detection limit of 3.21 pM (S/N = 3). The steric effect on electrode surface is a bottle-neck issue restricting devised biosensors advancement. In this work, the reaction between 5hmC and PFc was carried out in the solution, which can avoid steric effect on electrode surface to keep the high activity of enzyme. In addition, the biosensor was successfully applied to detect 5hmC in genomic DNA of chicken embryo fibroblast cells and different tissues of rice seedlings.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Yi Xiao,Ting Wang,Ganhua Qiu,Kun Zhang,Changguo Xue,Benxia Li
Photocatalytic reactions represent a kind of green and sustainable chemical processes for organic transformations, but the efficiency is limited by the severe recombination and/or inadequate redox potentials of photoinduced charge carriers in photocatalysts . To address these issues, herein, the CdS-EDTA/g-C 3 N 4 heterostructures were designed according to Z-scheme photocatalytic mechanism and synthesized by the hydrothermal growth of CdS on g-C 3 N 4 nanoflakes with assistance of EDTA chelating agent. EDTA played multiple roles in the formation of CdS-EDTA/g-C 3 N 4 heterostructure photocatalysts, such as controlling the morphology of CdS nanostructures , linking CdS and g-C 3 N 4 together, and boosting the charge transfer between two semiconductors. The optimized CdS-EDTA/g-C 3 N 4 (10%) photocatalyst exhibited much higher activities toward the selective reduction of nitrophenol and the selective oxidation of benzyl alcohol , than those of CdS/g-C 3 N 4 heterostructures without EDTA. The enhanced photocatalysis of CdS-EDTA/g-C 3 N 4 can be ascribed to the efficient separation and suitable photoredox potentials of photoexcited charge carriers in the EDTA-bridged Z-scheme system. This work provides the inspiration for exploring inexpensive organic electron mediators for constructing all-solid-state Z-scheme photocatalysts and demonstrates the enhanced performance of Z-scheme photocatalysts for photoredox reactions of organic transformations.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）