JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Yongkun Liu,Guohua Jiang,Bo Yu,Uwamahoro Evariste,Pianpian Ma
Herein, the phosphorus-substituted nickel cobalt sulfides nanosheet arrays growth on nitrogen doped carbonic nanofibers (donated as Ni–Co–S–P) are prepared by an electrodeposition method. The morphologies and chemical composition of Ni–Co–S–P are investigated by SEM, TEM, XPS and EDS . The electrochemical properties of Ni–Co–S–P are tested by CV , GCD and EIS technologies. And the sample Ni–Co–S–P-4 displays the most outstanding electrochemical properties including electrocatalytic activity, rate capability and specific capacitance. In addition, the iron oxide nanosheets growth on N-CNFs (Fe–O/N-CNFs) are prepared by the same electrodepositing route. And they can serve as a negative electrode according to the electrochemical performances analysis. A hybrid supercapacitor based on the obtained electrodes is further assembled by using Fe–O/N-CNFs as negative electrode and Ni–Co–S–P as positive electrode. The as-fabricated hybrid supercapacitor show outstanding energy storage performance, it possesses a high energy density at 55.8 Wh·kg −1 corresponding to a power density at 402.9 W kg −1 .
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Nanomaterials
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2020
·Vol. 10
·期 4
·631
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IF 4.324
Zhen Li,Libo Yu,Hao Wang,Huiwen Yang,Huan Ma
Light harvesting and electron recombination are essential factors that influence photovoltaic performance of quantum dots sensitized solar cells (QDSSCs). ZnO hollow microspheres (HMS) as architectures in QDSSCs are beneficial in improving light scattering, facilitating the enhancement of light harvesting efficiency. However, this advantage is greatly weakened by defects located at the surface of ZnO HMS. Therefore, we prepared a composite hollow microsphere structure consisting of ZnO HMS coated by TiO2layer that is obtained by immersing ZnO HMS architectures in TiCl4aqueous solution. This TiO2-passivated ZnO HMS architecture is designed to yield good light harvesting, reduced charge recombination, and longer electron lifetime. As a result, the power conversion efficiency (PCE) of QDSSC reaches to 3.16% with an optimal thickness of TiO2passivation layer, which is much higher when compared to 1.54% for QDSSC based on bare ZnO HMS.Keywords:TiO2passivation layer;ZnO hollow microspheres;quantum dots sensitized solar cells
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Xingliang Chen,Tao Shi,Guanglei Wu,Yun Lu
The MoS 2 @polypyrrole@Fe 3 O 4 composite was skillfully synthesized via a novel one pot method. No any separation step during the synthesis process, and the Fe 2+ was successively utilized to prepare the Ppy and Fe 3 O 4 , which can achieve a high utilization of raw materials. The characterization about microstructure, crystal form, elemental composition and surface functional groups verify the structure of MoS 2 @polypyrrole@Fe 3 O 4 . Its hysteresis loop indicates that the composite performs typical soft magnetism behavior, with a magnetic saturation value of 20.3 emu.g −1 , which is helpful to improve the magnetic loss for EM wave absorbing. The reflection loss curve suggested that the composite exhibits superior EM wave absorption performance, with a minimum reflection loss value of –32 dB at the specimen thickness of just 2.0 mm due to the fair electromagnetic matching, interface polarization and interface relaxation. In addition, the one pot method used in this work can promisingly be applied to prepare other similar composites such as carbon fiber@polypyrrole@Fe 3 O 4 , graphene@polypyrrole@Fe 3 O 4 .
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Meng Yao,Ao Liu,Chunxian Xing,Bosen Li,Shanshan Pan,Jiahe Zhang,Peipei Su,Haitao Zhang
Supercapacitors have emerged as appealing alternatives to rechargeable energy storage devices in renewable energy generation and storage systems due to their ultra-high power characteristics. However, their broad applications are hindered by their low energy density characteristic. Therefore, the designs of electrodes with high rate and high specific capacitance and electrolytes with wide-potential window are extremely crucial. A novel core–shell heterostructure, TiNb 2 O 7 as the core and C-encapsulated MoS 2 as the shell, was demonstrated. As a result of synergistic effects induced by the core–shell heterostructure, this nanoarchitectural anode exhibited a high rate capability and an excellent cyclic stability, 99% capacity was retented after 500 cycles. Moreover, a nanocomposite ionogel electrolyte composed of ionic liquid (IL), poly(vinylidene fluoride-co-hexafluoropropene)-hexafluoropropylene (PVDF-HFP) and SiO 2 was prepared. In our study, optimized solid lithium-ion capacitors (SLICs) exhibited an impressive energy density of 147.2 Wh kg −1 at 60 °C and an outstanding ultra-long term stability, 93.7% capacity was retented after 10,000 cycles at 1 A g −1 . These outstanding performances could be ascribed to the widened potential window and remarkable ionic conductivity of the ionogel electrolyte. The effective combination of nanoarchitectural anodes and a nanocomposite ionogel provides a novel and profound direction for the fabrication of highly safe and reliable solid lithium-ion capacitors with an enhanced high energy density.
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CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Jingchao Wang,Tianyong Zhang,Shuang Jiang,Xiaoyuan Ma,Xiao Shao,Yiwei Liu,Di Wang,Xianggao Li,Bin Li
The electrostatic induced self-assembly method is successfully applied to prepare core-shell hierarchical structure of BiOI/OMCMB (Oxidized mesocarbon microbead) composites (MB), in which BiOI nanosheets were uniformly immobilized on the surface of OMCMB. The low-priced graphite carbon OMCMB played a crucial role in inducing and assembling the core-shell structure of the MB composites, which not only effectively improved the conductivity of the catalyst but also enhanced the stability of BiOI in the catalytic process. The photocatalytic degradation of tetracycline hydrochloride (TH) revealed that the hierarchical structure of OMCMB and BiOI promoted the photogenerated charge separation, and enhanced the photocatalytic performance of BiOI. And sample MB-3 had the highest photocatalytic performance with TH degradation of 96.8% under the visible-light irradiation for 60 min. MB-3 remains favorable photocatalytic activity after four cycles. Moreover, based on the related optical and electrical characterization analysis, a possible photocatalytic mechanism about MB composites was proposed tentatively.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Rui Wang,Erqi Yang,Xiaosi Qi,Ren Xie,Shuijie Qin,Chaoyong Deng,Wei Zhong
It is well recognized that advanced microwave absorbers (MAs) with the characteristics of light weight, good stability, strong absorption, thin thickness and wide absorption bandwidth are highly desirable. In this study, we reported a simple hydrothermal route to synthesize core@shell structure CNTs@MoS 2 nanocomposites (NCs), which were designed as novel and outstanding MAs. By controlling the amounts of initial Mo and S sources, different MoS 2 contents of CNTs@MoS 2 NCs were selectively produced. The results showed that the as-prepared CNTs@MoS 2 NCs displayed the excellent microwave absorption properties (MAPs) owing to their synergetic effect and unique nanoflower morphology of MoS 2 , and their comprehensive MAPs could be improved significantly by optimizing the MoS 2 contents and the filler loading. Impressively, when the filler loading is 40 wt%, the as-prepared CNTs@MoS 2 sample could simultaneously displayed the minimal reflection loss value of −54.75 dB with the very thin matching thickness of 1.49 mm, and effective absorption bandwidth (~4.0 GHz) at the low thicknesses of 1.26 mm. Taking into account of low cost and high stability, one could find that the designed CNTs@MoS 2 displayed very extraordinary comprehensive MAPs, which provided a reliable strategy to design high-performance MAs.
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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.
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ACS Applied Energy Materials
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2020
·
IF 4.473
Yapeng He,Panpan Zhang,Hui Huang,Xiaobo Li,Xinhua Zhai,Buming Chen,Zhongcheng Guo
The development of an efficient metal sulfide cathode is of great importance and an ongoing challenge for the practical application of an aqueous rechargeable Ni-Zn battery. Herein, Ni3S2 nanosheets with abundant sulfur vacancies (r-Ni3S2) have been successfully prepared via hydrothermal reaction and surface engineering, which are further employed as the binder-free cathode of the aqueous Ni-Zn battery. Benefitting from the features of substantially improved electrical conductivity, low band gap, abundant active sites, and good intrinsic capacity, the r-Ni3S2 electrode delivers an impressive reversible specific capacitance (1621.6 F g–1 at 0.2 A g–1) and extraordinary rate capability (62.1% retention under 8 A g–1). Moreover, the aqueous rechargeable r-Ni3S2//Zn battery exhibits a remarkable specific capacity (240.8 mAh g–1 at 1 A g–1) and preeminent cycling durability (only 8.4% decay after 3000 cycles). Besides, a glorious energy density of 419.6 Wh kg–1 together with a peak power density of 1.84 kW kg–1 could be achieved, surpassing a significant percentage of the reported Ni-Zn batteries. The results reveal that the r-Ni3S2 cathode with abundant sulfur vacancies and the adopted facile approach possesses huge promotion potential for Ni-Zn batteries and is promising to numerous electronics and electric vehicle applications in the future.
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DESALINATION
·
2020
·
IF 7.098
Qingmiao Wang,Feifei Jia,Anhua Huang,Yi Qin,Shaoxian Song,Yanmei Li,Mario Alberto Corona Arroyo
A novel three-dimensional (3D) MoS 2 -based evaporator (MPU-PPU) was constructed for solar desalination in this work. This evaporator provided a typical design of double layer structure (DLS): the top layer which was formed via embedding nanoscale MoS 2 onto frameworks of 3D porous polyurethane (PU) sponge, played the role of solar absorbing and photothermal conversion , while the bottom layer which was originated from PU sponge with the hydrophilic PDA coating, functioned as the thermal insulation layer and water pump. With low cost, facile construction pathway and good mechanical flexibility, the MPU-PPU evaporator simultaneously exhibited high evaporation efficiency of 85% under a low illumination of 1.0 kW m −2 and superhigh evaporation efficiencies over 90% under higher solar illumination (1.5–2.5 kW m −2 ), which outperformed many other reported advanced materials for solar desalination . The four factors: (1) high photothermal efficiency, (2) localized heating effect, (3) hydrophilic bottom layer to leverage capillary forces and promote fluid flow to the hot region, together with (4) the porous structure which enabled efficient water supply and vapor channel, mainly accounted for the high-efficiency solar desalination. Besides, the MPU-PPU evaporator exhibited the outstanding desalination efficiency and excellent recyclability , providing great potential in its commercial use for solar desalination.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Hao Liu,Qing-da An,Jeonghun Kim,Lin Guo,Yu-meng Zhao,Zuo-yi Xiao,Shang-ru Zhai
The recovery of noble metals from aqueous systems is of great significance for constructing sustainable framework of modern industry yet remains challenging. Herein, Cu x S y /Carbon composites with superior thermal stability and adsorption capacity were successfully synthesized via one-pot hydrothermal method using lignosulfonate as dual role of raw materials. The optimal synthesis conditions were investigated via tailoring the temperature and the mass ratio of reagents. The morphologies and physical properties of the composites were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The surface chemistry was analyzed by Zeta potential analysis, Brunauer-Emmet-Teller (BET), and X-ray photoelectron spectroscopy (XPS). The Langmuir model and the pseudo-second-order model well described the adsorption of Pd(II) and Pd(IV) delivered by fabricated composites. The adsorption capacity obtained from Langmuir isotherm model towards Pd(IV) was 114 mg/g and Pd(II) was 101 mg/g, respectively. More importantly, the adsorbed palladium species could be desorbed with hydrochloric acid and thiourea, which suggested good durability and recycling performance of the typical composite. This work might provide a new guidance for the utilization of lignin or its derivatives and enriched the research in the field of noble metal recovery.
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JOURNAL OF SOLID STATE CHEMISTRY
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2020
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IF 2.726
Yan Zhou,Jingtong Zhang,Fengchao Sun,Xinping Yu,Wenpei Kang,Jun Zhang
In this work, sheet-like Co 9 S 8 was directly grown on Ni 3 S 2 spheres (donate as Co 9 S 8 @Ni 3 S 2 ) via a one-step hydrothermal synthetic approach. The structural characterization of Co 9 S 8 @Ni 3 S 2 revealed that the Co 9 S 8 nanosheets were perpendicularly arrayed on Ni 3 S 2 spheres. This heterostructure thus fixes the two-dimensional Co 9 S 8 in position on Ni 3 S 2 spheres to obtain a stable heterostructural material. Due to the strengthened morphological structure, high surface area, metallic feature of Co 9 S 8 and Ni 3 S 2 , and the synergetic effect, the Co 9 S 8 @Ni 3 S 2 showed excellent performance in sodium ion battery (SIB) anode and HER cathode. The electrochemical tests showed that Co 9 S 8 @Ni 3 S 2 can demonstrate excellent HER catalytic activity with only −0.16 V and −0.23 V overpotential needed to achieve 10 mA cm −2 and 100 mA cm −2 current density in acidic condition. Besides, Co 9 S 8 @Ni 3 S 2 heterostructure as an anode in SIB also delivered high discharge capacity of 699 mAh g −1 at 0.5 A g −1 current density in the first cycle, with 92% Columbic efficiency.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
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2020
·
IF 3.209
Rongying Luo,Hai Han,Jia Liu,Dongsheng Xu,Qiqin Wang,Salvatore Fanali,Zhengjin Jiang
A novel chiral stationary phase (CSP), based on a monolithic organic polymer chemically modified with teicoplanin, was fabricated within a 100 μm I.D. fused silica capillary. The teicoplanin was firstly derivatized with 2-isocyanatoethyl methacrylate (ICNEML) and then thermally co-polymerized with the crosslinker ethylene dimethacrylate (EDMA) in presence of porogens (methanol and dimethylsulfoxide). The optimal experimental conditions (e.g., concentration and ratio of the reagents), considering enantioresolution and permeability, were systematically investigated. The prepared monolith was evaluated using scanning electron microscopy, and the column exhibited quite good morphology. In order to further evaluate the enantioresolving power of the poly(ICNEML-teicoplanin- co -EDMA) monolith, a series of basic and acidic chiral compounds were analyzed using an isocratic mode of polar organic solvents (methanol and acetonitrile) or the same solvents in combination with water (reversed-phase) by nano-liquid chromatography. Five mandelic acids and six derivatized amino acids were enantioresolved under reversed-phase mode ( R s = 1.22–3.47 and α = 1.43–6.33). This monolithic teicoplanin-CSP was also effective in the enantioseparations of 17 amino alcohol drugs employing polar-organic phase mode (MeOH/ACN/TEA/HOAc (80/20/0.03/0.055, v/v/v/v)). Ten of them were baseline enantioresolved (alprenolol, betaxolol, clenbuterol, isoproterenol, metoprolol, pindolol, propranolol, salbutamol, sotalol, tertatolol) ( R s = 1.55–2.48 and α = 1.21–1.55), while the others were partially enantioseparated ( R s = 1.14–1.48).
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