MICROCHEMICAL JOURNAL
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2020
·
IF 3.594
Yiju Song,Kaihang Cao,Wenjun Li,Chaoyun Ma,Xiuwen Qiao,Hongling Li,Chenglin Hong
A three-dimensional array of reduced graphene oxide/MoS 2 @ polyaniline-layered nanosheets (denoted as rGO/MoS 2 @ PANI) has a novel structure of intercalated MoS 2 /PANI nanosheets arrays arranged on rGO that can be used as carcinoembryonic antigen (CEA) electrochemical immunosensors (detectors). In this graded nanosheet, the PANI was embedded in the MoS 2 interlayer. The MoS 2 /PANI nanosheets themselves limit volumetric changes when arranged as MoS 2 /PANI nanosheet arrays on rGO nanosheets to provide tight and sufficient heterogeneity. PANI locates on the interface itself and contains a large amount of –NH 2 that can bind many antibodies. Simultaneously, we investigated the optimal amount of aniline to add. We found that these arrays had excellent film thickness and conductivity for improving CEA detection sensitivity. The tested immunosensor achieved sensitive and specific detection of CEA, with a detection limit of 0.3 pg mL −1 . Under the optimal conditions, the prepared immunosensor exhibited acceptable reproducibility and selectivity and excellent stability. Satisfactory results of human serum samples indicated the potential application of the immunosensor for clinical monitoring of tumor markers.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Wenhu Yang,Hao Guo,Liguo Yue,Qi Li,Mengni Xu,Longwen Zhang,Tian Fan,Wu Yang
In this present paper, a novel layered multi-metal sulphide was reported as a positive electrode material with abundant electroactive sites and redox reaction centres. Molybdenum and sulfur elements were introduced into the metal-organic frameworks (M-MOF: M = Ni, Co and Ni/Co) to synthesize layered MMoS x by a hydrothermal method . The electrochemical performance comparison of MOFs and six electrode materials demonstrated that NiCoMoS x electrode materials had the best electrochemical performance and the highest specific capacitance. The highest specific capacitance could reach 2595 F g −1 at a current density of 1 A g −1 . The NiCoMoS x electrode material also had an excellent cycle stability with a retention rate of 90.8% after 10,000 charge and discharge cycles. In addition, the as-assembled NiCoMoS x //AC assymmetric supercapacitor (ASC) device exhibited a maximum energy density of 48.2 Wh·kg −1 at a power density of 807.2 W kg −1 , and the capacity retention rate after 10,000 charge and discharge cycles was 91.6%. This electrochemical performance indicated that this kind of material had a good market development prospect.
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CELLULOSE
·
2020
·Vol. 27
·期 11
·6175-6188
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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.
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Journal of Materials Chemistry A
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2020
·Vol. 8
·期 23
·11607-11616
·
IF 11.301
Qiaozhi Sun,Biao Zhang,Lechen Diao,Biao Chen,Kai Song,Liying Ma,Fang He
The electrocatalytic hydrogen evolution reaction (HER) in water–alkali and chlor–alkali electrolyzers is an indispensable source of H2 supply for industrial applications. Transition metal dichalcogenides (TMDs) have been demonstrated to be highly promising for the HER, but they are mostly operated in acidic solutions. Rationally designing TMD electrocatalysts towards efficient alkaline HER still remains challenging. Herein, we report a controllable atomic engineering of nitrogen atoms into 1T′-phase ReS2 using a simple one-step method. The optimized material shows a greatly enhanced HER performance under alkaline conditions, achieving a low overpotential of 90 mV at 10 mA cm−2 and outstanding stability (with negligible activity decay during the 140 h test). Density functional theory calculations reveal that rational N-implanting remarkably promotes H2O dissociation and H adsorption/desorption on the edge active sites of ReS2, and meanwhile increases electronic states near the Fermi level for improved charge transfer. Such ensemble effects are proposed to account for the much improved HER activity. The work broadens the horizon for designing TMD materials via atomic-site engineering for alkaline HER or other catalysis reactions.
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JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 25
·11167-11176
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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.
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ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Yuan Lin,Qiao Zhang,Yuhang Li,Yunpeng Liu,Kejia Xu,Jiangnan Huang,Xiaosong Zhou,Feng Peng
An incompletely covered CdS/ZnS core/shell is synthesized via a simple hydrothermal method. Due to the defect energy levels introduced by zinc vacancies, the typical type-I heterojunction of CdS/ZnS evolves to a type-II heterojunction and Z-scheme hybrid structure so that the ZnS shell can timely transfer and capture the photogenerated holes from the CdS core. The surface photovoltage (SPV) distribution caused by photogenerated charges on the surface of catalyst is visually presented by Kelvin probe force microscopy with synchronous illumination (microscope SPV). It intuitively proves the effective spatial separation of photogenerated holes from the CdS core to the ZnS shell, for the first time. Under optimal conditions, the highest hydrogen production rate of CdS/ZnS reached 24.1 mmol g–1 h–1 under visible light illumination. The average apparent quantum yield of 9.3% can be achieved for 9 h of illumination (λ = 420 ± 5 nm). It exhibits highly efficient photocatalytic H2 evolution with well stability.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 44
·期 6
·4827-4836
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IF 3.741
Mojie Sun,Zhao Wang,Bixue Gao,Shijie Wang,Chi Wang,Xiaochen Song,Dongyao Lin
Summary To circumvent the expensive cost of precious metal electrocatalysts, a hydrothermal method and a plasma-enhanced chemical vapor deposition (PECVD) method have been used to prepareNiS 2 -Ni(OH) 2 /NF-PECVD (N-PECVD) with excellent properties. After XRD, SEM, XPS, and other characterization methods, it can be seen that after the hydrothermal reaction of Ni foam (NF), 50-60 nm Ni(OH) 2 nanosheets have grown on the NF frame. The subsequent PECVD reaction produces 90 nm NiS 2 -Ni(OH) 2 nanosheets on the NF frame. The hydrogen release overpotentials in the acidic solution and alkaline solution are 90 and 95 mV ( j = 10 mA/cm 2 ), respectively. And the Tafel slopes reach 80 and 83.6 mV/dec, respectively. The chronopotential (CP) test shows that the material has good HER stability over 12 h. The results from the subsequent electric double layer capacitance and alternating current impedance (EIS) tests show that N-PECVD synthesized by PECVD has a relatively large active electrochemical surface area (ECSA) and a low electrochemical impedance. This study not only finds good inspiration for the synthesis of cheap HER catalysts but also provides a valuable reference for the synthesis of materials in other fields.
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Colloid and Interface Science Communications
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2020
·
IF 2.831
Hongye Huang,Yi Cui,Meiying Liu,Ziyang He,Guang Yang,Fengjie Deng,Naigen Zhou,Xiaoyong Zhang,Yen Wei
In this work, we reported the preparation of nitrogen and FeS x codoped porous carbon through hydrothermal treatment of FeCl 3 , thiourea and porous carbon. The degradation results demonstrated that PC-FeS x composite displayed high degradation efficiency towards organic dyes with excellent reusability. Moreover, the degradation efficiency under alkaline solution (pH = 11) is even better under acidic solution (pH = 3), indicating that other routes for generation free radicals were existed. Electron spin resonance (ESR) spin−trap technique was used to determine the free radical species and results demonstrated that both •OH and O 2 − are formed during Fenton reaction . Considered the facile operation procedure, low cost of reagents and high degradation efficiency, we believe this work should of broad interest for fabrication of multifunctional composites for environmental treatment.
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LUMINESCENCE
·
2020
·Vol. 35
·期 8
·1350-1359
·
IF 1.855
Liu Zhang,Yue Hou,Xiaoyan Guo,Wei Liu,Congcong Lv,Chunyang Zhang,Yan Jin,Baoxin Li
In this study, three types of Fe(III) bipyridyl or phenanthroline (Fe(III)-L 3 ) complex could directly catalyze 3,3′,5,5′-tetramethylbenzidine (TMB) to induce blue chromogenic changes without H 2 O 2 . Fe(III)-L 3 complex could induce a colour change in TMB directly after a short incubation time. Due to the high oxidase-like activity of the Fe(III)-L 3 complexes, superoxide anion radicals (O 2 •– ) were formed in solution. Intermediates radical involving oxo-iron species were then produced that oxidized TMB to its oxidation products (oxTMB), which had an absorbance maximum at 652 nm. Glutathione (GSH) could inhibit the oxidation reaction of the Fe(III)-L 3 complex–TMB system, a rapidly colorimetric method was established for the specific detection of GSH that had a detection limit of 0.1 μM. Furthermore, Fe(III)-L 3 complexes could catalyze TMB to oxTMB directly without H 2 O 2 . This fast and simple colorimetric method may open a new avenue for application in the point-of-care diagnosis field using the TMB chromogenic system.
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高影响因子
Materials Today Energy
·
2020
·
IF 5.604
Jun Xu,Rixin Wang,Xing Chen,Ru Zhou,Junjun Zhang
Copper-containing bimetallic sulfides are regarded as an emerging low-cost catalyst for electrocatalytic hydrogen generation. In this work, we report for the first time the ternary Cu 2 SnS 3 (CTS) nanocrystals anchored reduced graphene oxide (rGO) nanosheets (CTS@rGO) as a superior electrocatalyst for efficient hydrogen generation. The CTS nanocrystals with 5–10 nm are much homogeneously distributed on the surface of rGO nanosheets. In the CTS@rGO composite, the rGO works as a robust scaffold that can effectively suppress aggregation of the CTS nanocrystals and ensure more exposed active sites on CTS surfaces. Furthermore, the conductive rGO is beneficial to fast charge transfer. Therefore, the CTS@rGO catalyst possesses a large electrocatalytic active surface area and a small charge transfer resistance. As a result, the CTS@rGO exhibits significantly enhanced catalytic activity for hydrogen evolution reaction (HER) in both the acid and alkaline electrolytes in comparison with the pristine CTS nanocrystals. The CTS@rGO delivers a striking catalytic kinetic metrics of a small Tafel slope of 54 mV dec −1 , a low overpotential of 252 mV at a current density of 10 mA cm −2 , long operation stability of 4 day in the acid electrolyte.
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CHEMOSPHERE
·
2020
·
IF 5.778
Xiaoping Wang,Chao Wu,Tongren Zhu,Pan Li,Shengji Xia
Membrane fouling is an issue of concern due to the hydrophobic properties of polyethersulfone (PES) membrane when applied in water treatment . In this work, a facile hydrothermal method was utilized to synthesize hierarchical flower-like structured molybdenum disulfide nanosheets (HF–MoS2 NSs) that then incorporated into PES membranes as composite membranes. We characterized their permeability, the separation performance, the antifouling performance, and the antibacterial activity systematically. Results showed that composite membranes exhibited a better pure water flux (286 LMH/bar) at the HF–MoS 2 NSs content of 0.4 wt%, which was 1.8 times higher than the control membrane. Also, composite PES membranes achieved 98.2% and 96.9% rejection of BSA and HA in comparison with the control PES membrane (87.3%, and 84.5%, respectively). Compare to the control PES membrane, the flux recovery ratio of the composite membrane increased from 69% to 88% for BSA fouling and increased from 84% to 93% for HA fouling. The retention rate for the organic dyes also improved slightly after HF–MoS2 NSs incorporation into the membrane. Additionally, the composite membranes exhibited a relatively high antibacterial activity against E. coli and B. subtilis with antibacterial rates of 67.8% and 82.5%, respectively. In conclusion, HF–MoS2 NSs incorporated composite membranes were shown to have outstanding filtration performance and could be a promising candidate for practical application in water filtration.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2020
·
IF 6.444
Lixue Gai,Yumeng Zhao,Guilin Song,Qingda An,Zuoyi Xiao,Shangru Zhai,Zhongcheng Li
Herein, a novel core-shell PPy@MoS 2 nanotube-like heterostructures were prepared with hollow polypyrrole nanotubes and intertwined MoS 2 nanosheets as core and the outer shell, respectively, by combining chemical oxidative polymerization and hydrothermal process. The unique heterostructures endowed the designed composite with highly enhanced electromagnetic wave absorbing performance. In contrast to pristine hollow PPy nanotubes and MoS 2 nanoflowers, the fabricated PPy@MoS 2 composite not only possessed excellent reflection loss (RL) performance, but also displayed a broad absorbing bandwidth, which might be ascribed to the good impedance matching and multifarious loss pathways including dipole polarization, interfacial polarizations and conductive loss. Impressively, the widest bandwidth (RL < −10 dB) of PPy@MoS 2 could be gained up to 6.4 GHz at 2.5 mm, and the optimal RL is −49.1 dB at 6.1 GHz. In combination of controllable preparation process and highly enhanced performance, this newly PPy@MoS 2 might be a promising candidate in remediation of electromagnetic wave pollution.
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