ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xinan Shi,Yuxiang Wang,Hui Yu,Gang Wang,Lijian Huang,Daocheng Pan
The crystal quality of a Cu2ZnSn(S,Se)4 (CZTSSe) thin film is crucially important to a high-performance CZTSSe solar cell. After selenization, a bilayer CZTSSe thin film consisting of a large-grain top layer and a small-particle bottom layer is usually observed according to the literature. In this work, a facile air-annealing pretreatment is conducted for a Cu2ZnSnS4 precursor thin film prior to selenization, which can lead to sodium diffusion into the CZTS precursor thin film and surface oxidization of the CZTS thin film. Our experimental results revealed that the Na prediffusion and the surface oxidation of the CZTS precursor thin film can significantly promote the crystal growth of the CZTSSe thin film, which can completely remove the small-particle bottom layer and form a large-grain-spanned CZTSSe thin film. As a result, a photoelectric conversion efficiency of 9.80% was achieved by this method.
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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.
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Journal of Materials Research and Technology-JMR&T
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2020
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IF 5.289
Chengli Yao,Jianglin Xu,Anjian Xie,Yuhua Shen
Nowadays, developing new anode material for lithium-ion batteries (LIBs) with distinguished electrochemical properties is still very significant and a huge challenge. Herein, a nanocomposite containing Co 9 S 8 /carbon (C)/nickel foam (NF) was synthesized. In the preparation process, ZIF-67 as the source of both Co 2+ and carbon was designedly grown in situ on the surface of NF with loose porous skeleton through the hydrothermal reaction. After sulfurization and pyrolysis of ZIF-67/NF, the porous flower-like Co 9 S 8 /C/NF composites formed. As a binder-free anode, Co 9 S 8 /C/NF exhibited excellent lithium storage performance, which showed a superior initial discharge capacity of 1926 mA h g −1 and reversible capacity of 1114 mA h g −1 after 200 cycles at 0.2 A g −1 . Even at 2 A g −1 current density, it could maintain a capacity of 578 mA h g −1 . The above outstanding electrochemical performances may be due to the following reasons. The loose flower-like structure assembled by lots of nanosheets, can provide a larger surface area for the transport and storage of Li + ions. With the cooperation of carbon matrix, the volume expansion of anodes can be effectively alleviated during charge and discharge process. At the same time, metal nickel foam as the current collector of the negative electrode also can increase the conductivity; promote the transport and diffusion of electrons. The loose skeleton enables the full contact of the active material with the electrolyte, which is beneficial to the transportation of Li + ions and electronics. This work provides an inspiration for designing and fabricating anode materials with distinguished-performance for LIBs.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yutong Luo,Jiaheng Qin,Guangxue Yang,Sha Luo,Ziming Zhao,Ming Chen,Jiantai Ma
The rational design and fabrication of distinctive coordination sites is an attractive and challenging approach to develop electrocatalysts with superior activity toward oxygen evolution reaction (OER). Constructing N-doped carbon shells coordinated with transitional metal composites can greatly enhance the OER activity of electrocatalysts. Herein, a facile electrochemical-pyrolysis strategy is applied to synthesize NiS/C 3 N 4 composite with N-Ni-S coordination sites by in-situ crystallization on copper foam (CF). A detailed characterization, especially synchrotron-based X-ray absorption fine structure (XAFS) clearly unravels the N-Ni-S coordination mode is successfully formed. As a result, NiS/C 3 N 4 presents excellent OER performance with a low overpotential of 334 mV at a current density of 10 mA cm −2 , a Tafel slope of 45 mV dec −1 , and robust electrochemical stability for 50 h in basic media, outperforming some recently reported conventional transitional metal electrocatalysts. The outstanding electrocatalytic performance of NiS/C 3 N 4 mainly originates from the N-Ni-S coordination sites, which can provide abundant catalytic active sites, facilitate charge transfer, and enhance electronic conductivity. Furthermore, by tuning the two important experimental parameters of electrodeposition potential and electropolymerization time, the relationship between morphology and electrocatalytic performance of catalysts is deeply explored. This work demonstrates the validity of improving electrocatalytic performance by elaborately tailoring the coordination sites, thereby opening up an applicable and inspiring avenue forward in the design of advanced electrocatalysts for water splitting.
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JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES
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2020
·
IF 0.992
Shiyun Tang,Yuanxing Duan,Feng Chang,Wei Jiang,Fengmei Zhang,Zhihua Liu,Yuting Yang,Chunbo Liu,Yingzhuang Chen
The porous layer open-tube (PLOT) columns, which were characterized by their considerable specific surface area and high permeability, have attracted a growing attention from researchers in liquid chromatography. In this work, a hydrophilic PLOT column rich in carboxylic acid functional groups was successfully synthesized in capillary with an inner diameter of 200 µm by thermally initiated aqueous two-phase polymerization. Methacrylic acid (MAA) areas monomers that responsible for the introduction of polar functional groups, and poly(ethylene glycol) diacrylate (PEGDA) are as cross-linker. The optimized PLOT column has a uniform, moderately thick porous layer, which is tightly bonded to the inner wall without any detachment. The hollow structure gives the PLOT column good permeability, which facilitates fast mass transfer. The systematical evaluations of the resulting PLOT columns were performed by using polar analytes including nucleosides, bases, amides, phenols and carboxylic acids. Those results demonstrated excellent separation performance for the small polar molecules. Compared to the poly(PEGDA) PLOT column, the hydrophilic retention of analytes on poly(PEGDA-co-MAA) porous layer open-tube column is significantly improved by the introduction of carboxylic acids. Furthermore, with modified nucleosides and chlorophenols being disease markers and the persistent pollutant of wide concern, respectively, the separation was optimized and the linear range of the quantitative analysis was examined for both targets. which indicates the potential application of such PLOT column for analysis of real samples.
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BIOMATERIALS
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2020
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IF 10.317
Fan Jiang,Binbin Ding,Shuang Liang,Yajie Zhao,Ziyong Cheng,Bengang Xing,Ping'an Ma,Jun Lin
Rational design of biocompatible nanoplatforms simultaneously realizing multimodal imaging and therapeutic functions is meaningful to cancer treatment. Herein, the MoS 2 –CuO heteronanocomposites are designed by integrating semiconductor CuO and flower-like MoS 2 via a two-step hydrothermal method . After loading bovine serum albumin (BSA) and immunoadjuvant imiquimod (R837), the obtained MoS 2 –CuO@BSA/R837 (MCBR) nanoplatforms realize the excellent computed tomography/infrared thermal/magnetic resonance multi-mode bioimaging as well as significantly enhanced antitumor efficacy of synergetic photothermal therapy (PTT)/chemodynamic therapy (CDT)/immunotherapy. In this nanoplatform, the semiconductor CuO exhibits peroxidase-like activity, which can react with over-expressed H 2 O 2 in tumor microenvironment (TME) to generate OH for CDT via Haber-Weiss and Fenton-like reactions. And this process can be further accelerated by the generated heat of MoS 2 under 808 nm laser irradiation . More importantly, the obtained multifunctional MCBR nanoplatforms under near-infrared (NIR) irradiation would destroy tumor cells to generate tumor associated antigens (TAAs), which combine with R837 as an adjuvant to trigger strong antitumor immune responses for effectively eliminating primary tumors and metastatic tumors.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Zewei Hao,Pengkun Wei,Yang Yang,Jingyu Sun,Yunhua Song,Donggang Guo,Lu Liu
Eminent OER electrocatalysts occupies a vital position for hydrogen produced from water splitting. Up to now, sulfides with spinel structure have been considered as the most promising electrocatalysts to replace noble metal catalysts, but generally their catalytic activities are still unsatisfactory. Based on above situation, we used one-step solvothermal method to synthesis two CuCo 2 S 4 nanosheets by introducing two different surfactants. Two CuCo 2 S 4 nanosheets both show outstanding catalytic properties for OER. Specifically, CuCo 2 S 4 CNS exhibits the best OER performance with a low overpotential of 269 mV at a current density of 10 mA cm −2 and a small Tafel slope of about 41 mV dec −1 in 1.0 M KOH. The CV scanning and chronoamperometry tests also show its excellent stability. XPS analysis reveals the introduction of Cu ions into Co 3 S 4 lattice improve the relative concentration of Co 3+ on CuCo 2 S 4 nanosheets surface, which makes the catalytic performance get extensively improvement.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Wensha Niu,Zuoyi Xiao,Shifu Wang,Shangru Zhai,Longfei Qin,Zhenyu Zhao,Qingda An
Transition metal sulfides are regarded as an attractive electrode material because of their excellent metalloid characteristic and good electrical conductivity for supercapacitor applications. Herein, we successfully fabricated a hybrid material of NiS x nanoparticle-supported on porous carbon (NiS x @C) by crosslinking sodium alginate with nickel ions , followed by performing a high-temperature carbonization and low-temperature vulcanization process. The NiS@C and NiS 2 @C hybrids are obtained through changing the carbonization temperature and adjusting the mass of the S-containing precursor. Both of them are subsequently evaluated for their comparative electrochemical performances. The NiS@C electrode shows an excellent specific capacity of 372.6 mA h g −1 at 0.5 A g −1 with a mass loading of 3.5 mg cm −2 , and then retains 216.2 mA h g −1 even if the current density adds up to 10 A g −1 . In contrast, the NiS 2 @C electrode delivers a specific capacity of 213.3 mA h g −1 at 0.5 A g −1 and an impressive capacity retention rate of 60.7% after 5000 charge-discharge cycles. Besides, the asymmetric supercapacitors composed of the NiS x @C hybrids and active carbon (AC) as the positive and negative electrodes deliver excellent energy densities of 58.7 W h kg −1 at a power density of 406.4 W kg −1 (NiS@C//AC device) and 44.4 W h kg −1 at a power density of 397.6 W kg −1 (NiS 2 @C//AC device), respectively.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Lin Zhang,Hongqiang Li,Xuejun Lai,Tianyuan Gao,Xingrong Zeng
A lot of attention has recently been focused on wearable strain sensors because of their promising applications in the rising areas of human motion detection, health monitoring, and smart human–machine interaction. However, the design and fabrication of self-healable strain sensors with superior overall properties including stretchability, sensitivity, response ability, stability, and durability is still a huge challenge. Herein, we report an innovative self-healable strain sensor with exceptional overall performance constructed with three-dimensional binary-conductive-network silver nanowire-coated thiolated graphene foam (AgNWs@TGF) and room-temperature self-healing functionalized polyurethane (FPU) elastomer. Taking advantage of the good ductility and continuity of the AgNWs@TGF binary structure and the excellent resilience of the FPU, the strain sensor exhibits good stretchability (up to 60% strain), high sensitivity [gauge factor (GF) of 11.8 at 60% strain and detection limit of 0.1% strain], fast response ability (response/recovery time of 40/84 ms), and exceptional durability for 800 cycles of fatigue test. Besides, the highly flexible polydimethylsiloxane chains, strong intermolecular hydrogen bonding, and dynamic exchange reaction of aromatic disulfides ensure the sensor excellent recovery property of electrical conductivity, and the GF of sensor after self-healed only increases slightly. More importantly, the sensor is successfully applied for detecting a variety of human motions including pulse beats, voice recognitions, various joint movements, and handwriting. The method for preparing room-temperature self-healable strain sensor is facile, scalable, and cost-effective. The finds provide a new perspective on fabricating new-generation high-performance and functional strain sensors for health monitoring, wearable electronics, and intelligent robots.
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JOURNAL OF NANOPARTICLE RESEARCH
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2020
·Vol. 22
·期 9
·1-11
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IF 2.132
Lin Jiaxin,Mei Qianwen,Duan Yingchun,Yu Chenhong,Ding Yaping,Li Li
The sensitive determination of VB 2 has broad analytical applications. In this work, a novel VB 2 electrochemical sensor based on the hydrothermal method was constructed to uniformly grow molybdenum disulfide and silver nanoparticles on the surface of electrospun carbon fiber. MoS 2 -Ag-CNF was characterized by scanning electron microscope, EDS spectrum, TEM analysis, cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy. The sensor exhibited a high sensitivity of 0.05 to 40 μΜ with a fast response time and a low detection limit of 0.02 μM. The electrode also showed outstanding selectivity toward various interferences. These results indicate that the MoS 2 -Ag-CNF nanocomposites may be promising electrode materials for electrochemical biosensing.
Graphical abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yuzhen Hou,Yanbiao Ren,Shichao Zhang,Kunpeng Wang,Fangshuo Yu,Tao Zhu
Practical application of the lithium-sulfur (Li–S) batteries is still hindered by their capacity decays caused by the shuttling of polysulfides . In this work, 3D MoS 2 nanoporous spheres (MoS 2 -NPSs), exposing abundant active edges by decorating on conductive reduced graphene oxide aerogels (rGOA/GA), were fabricated as an S host to construct the S@MoS 2 @GA cathodes. An S@MoS 2 @GA-0.425 cathode constructed as such delivered an initial capacity of 688 mAh g −1 and arrived at a high discharge capacity of 565 mAh g −1 after 200 cycles at 0.2C; moreover, a reversible capacity of 324 mAh g −1 retained for the electrode after 500 cycles at 1.0C with a slow capacity fading rate of 0.054% per cycle. The improved electrochemical performance can be attributed to the strong interactions of 3D MoS 2 @GA with lithium polysulfides intermediates (Li 2 S n where 4 ≤ n ≤ 8), and the fast lithium ion and electron transport channels formed in the cathode for the sulfur redox reaction . More importantly, the MoS 2 -NPSs electrocatalyst could chemically adsorb the Li 2 S n to fix soluble ones near the conductive GA surface and also could kinetically accelerate the transformation of Li 2 S n .
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yuechao Zhao,Xiangyun Zhao,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yafang Qi,Zhi Zheng,Sixin Wu
Although the traditional Cu-poor architecture addresses many limitations for Cu2ZnSn(S,Se)4 solar cells, its further development still encounters a bottleneck in terms of efficiency, primarily arising from the inferior charge transport within the quasineutral region and enlarged recombination at back contact. On the contrary, the electrical benign kesterite compound with higher Cu content may compensate for these shortages, but it will degrade device performance more pronouncedly at front contact because of the Fermi level pinning and more electric shunts. Based on the electric disparities on their independent side, in this work, we propose a new status of Cu component by exploring a large grain/fine grain/large grain trilayer architecture with higher Cu content near back contact and lower Cu content near front contact. The benefits of this bottom Cu-higher strategy are that it imposes a concentration gradient to drive carrier diffusion toward front contact and decreases the valence band edge offset in the rear of the device to aid in hole extraction. Also, it maintains the Cu-poor architecture at the near surface to facilitate hole quasi-Fermi level splitting. In return, the local Cu component engineering-mediated electric advances contribute to the highest efficiency of 12.54% for kesterite solar cells using amine–thiol solution systems so far.
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