ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Tongyu Liu,Linlin Chen,Xin Wang,Yaoguo Huang,Ming Wang,Yali Zhang
V 2 O 5 is considered as a promising cathode material for zinc ion batteries due to its abundance, low-cost, layered structure and high capacity. However, low electronic conductivity, vanadium dissolution accompanied with sluggish ion transport kinetics, severely limit its electrochemical performance. Herein, the polypyrrole-coated V 2 O 5 nanobelts arrays grown on carbon cloth (PPy@V 2 O 5 /CC) are rationally designed and prepared by combination of solvothermal and vapor-phase polymerization process. The resultant flexible PPy@V 2 O 5 /CC electrode delivers a high specific capacity of 276 mAh g −1 at 0.1 A g −1 , an excellent rate capability of 185 mAh g −1 at 10 A g −1 , and extraordinary long-term cycling stability with 76% capacity retention after 8000 cycles at 5 A g −1 , better than V 2 O 5 /CC. The significant enhancement can be attributed to the PPy protective layer, which can simultaneously achieve higher electronic conduction, suppressed vanadium dissolution, enhanced surface pseudocapacitive behavior, and faster Zn 2+ diffusion rate. This work offers a novel strategy for constructing high-performance micro/nano functional composites for electrochemical energy storage system.
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BIOELECTROCHEMISTRY
·
2019
·
IF 4.474
Dingding Duan,Xiaojing Si,Yaping Ding,Li Li,Guohong Ma,Lu Zhang,Bingyu Jian
In this paper, we constructed MIL-53 (AlOHbdc, bdc = benzene-1,4-dicarboxylate) /CNTs and Prussian blue (PB) as the double sensitization material of the sensing platform, in which the MIL-53/CNTs hybrid can not only increase the specific surface area but also increase the conductivity of the sensor and PB can play a role in amplifying electrical signals and accelerating electron transmission. Pyrrole was used as monomer and E2 was used as template for electropolymerization to form conductive film. Moreover, the overoxidation/dedoping elution method were used to simplify the experimental process. Under optimal conditions, the MIECS exhibited an excellent sensitivity and high selectivity with a wide linear response range between 10 −14 to 10 −9 mol L −1 and an estimated detection limit of 6.19 × 10 −15 mol L −1 .
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Nanomaterials
·
2019
·Vol. 9
·期 6
·833
·
IF 4.034
Zhi Zhang,Qi Lv,Yiwang Chen,Haitao Yu,Hui Liu,Guangzhen Cui,Xiaodong Sun,Ling Li
To reduce electromagnetic pollution as well as increase the accuracy of high-precision electronic equipment, more attention has been paid to new electromagnetic wave (EMW) absorbing materials, which have the advantages of strong absorption, wide absorption bands, and a narrow thickness. In this study, a novel ternary type of the NiS2@rGO/polypyrrole (PPy) sandwich-like structured composites was synthesized via a facile two-step method, in which the hydrothermal method was used to prepare NiS2@rGO binary composites and then the in situ polymerization method was used to synthesize the PPy, which acted as the outer layer of the sandwich-like structure. The morphologies and electromagnetic absorption performance of the NiS2@rGO/PPy were measured and investigated. A sample with 6 wt% NiS2@rGO/PPy loading paraffin-composite obtained an outstanding reflection loss (RL) of −58.7 dB at 16.44 GHz under a thickness of 2.03 mm. Simultaneously, the effective electromagnetic wave absorption bandwidth for RL < −10 dB, which covered 7.04 to 18.00 GHz (10.96 GHz), was achieved by changing the thickness of the absorber from 2.0 to 3.5 mm. The results not only suggest that the NiS2@rGO/PPy composite has excellent performance in the field of EMW absorption but also prove that the novel sandwich-like structure can contribute to appropriate impedance matching through multiple relaxation and interfacial polarization processes.Keywords:graphene;polypyrrole;sandwich-like structure;electromagnetic absorption
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Xing Yang,Yunrui Tian,Shatila Sarwar,Miaomiao Zhang,Huaiping Zhang,Jujie Luo,Xinyu Zhang
Two nanocompisitees with different morphologies of polypyrrole nanofibers/cobalt oxide (PPyNF/CoO x ) and polypyrrole nanotubes/cobalt oxide (PPyNT/CoO x ) were successfully prepared via a rapid and cost-efficient microwave approach. The micromorphology, surface chemical and crystalline structure of the resultant samples were characterized by FT-IR, XRD , SEM and XPS . Besides, electrochemical performances of the as-produced nanocompisitees with different mass ratio, microwave powers and times were further investigated as a battery-type electrode materials for supercapacitors . It was found that the maximum capacitance of PPyNF/CoO x could reached up to 270C g −1 at 1 A g −1 , as well as with good cycling stability (almost nothing capacitance loss after 1000 cycles). Compared to PPyNF/CoO x , PPyNT/CoO x , showed a lower specific capacitance of 167.5C g −1 at the same current density. Surprisingly, the specific capacitance of PPyNT/CoO x could be further increased by 166% (278.4C g −1 at 1 A g −1 ) after 1200 cycles, and the cycling stability with nearly 105% of the initial capacitance could be achieved after 4000 cycles. Moreover, the asymmetric supercapacitor device based on the PPyNF/CoO x //active carbon showed a maximum gravimetric energy density of 24.22 Wh kg −1 and power density of 6.8 kW kg −1 , testifying its enormous potential for energy storage devices.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2019
·
IF 3.47
Ziguo Yuan,Xin Zhang,Qian Yao,Ying Zhang,Yao Fu
In this study, a series of catalysts including different metal oxides loading on HZSM-5(Si/Al = 25) and cobalt oxides loading on different supports were synthesized to catalyze fast pyrolysis (CFP) of biomass derived polylactic acid (PLA) to produce acetonitrile under ammonia atmosphere. Both the metal and the acid of the catalyst had a crucial influence on the yield of acetonitrile and Co/HZSM-5(25) produced most acetonitrile. Other factors that might affect the product distribution including cobalt loading, reaction temperature, resident time and NH 3 flow rate have been investigated systematically. Under the optimized CFP condition (650 ℃; resident time 2.4 s; NH 3 flow rate 80 ml/min), the carbon yield and selectivity of acetonitrile in liquid product reached 50.2% and 83.6%, respectively. The possible reaction pathway from PLA to acetonitrile was also studied and proposed. PLA firstly cracked into lactic acid through thermal decomposition and formed lactide at the same time. Then lactic acid and lactide cracked into low-molecular aldehydes, ketones and acids. These aldehydes and ketones reacted with ammonia to form imines, acids to amides, and finally to acetonitrile and small amount of proponitrile under the catalysis of Co/HZSM-5 catalyst.
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Acta Biomaterialia
·
2019
·
IF 6.638
Qiang Yang,Pan Li,Haitao Ran,Jingyuan Wan,Huan Chen,Huali Chen,Zhigang Wang,Liangke Zhang
A theranostic nanoplatform (DTX/PFH@PPy-FA) for multi-modal imaging-guided photothermal-chemotherapy has been constructed. Lipid-perfluorohexane (PFH) nanodroplet loaded with docetaxel (DTX) was coated with a polypyrrole (PPy) shell. Then the folic acid (FA) molecule with active tumor-targeting function was modified on the surface of PPy shell. Due to the good photothermal conversion performance, PPy shell can raise the temperature under the near infrared laser irradiation, which not only produces photothermal effect to kill tumor cells, but also promotes liquid-gas phase change of PFH, and produces ultrasound imaging effect. The results of photothermal experiment and imaging experiment confirmed that the obtained DTX/PFH@PPy-FA possessed good photothermal, photoacoustic imaging and ultrasound imaging effects in vitro and in vivo . The results of in vitro cell experiments showed that DTX/PFH@PPy-FA had a active targeting ability to tumor cells, and its photothermal-chemotherapy synergistically inhibited the proliferation of tumor cells. In vivo study on 4T1-bearing BALB/c mice indicated that the photothermal-chemotherapy of DTX/PFH@PPy-FA not only effectively inhibited the growth of 4T1 breast cancer, but also inhibited lung metastasis. This multifunctional nanoparticle is expected to become a new nanoplatform for the visualized photothermal-chemotherapy of cancer. Statement of Significance In this work, we presented a multi-modal imaging-guided photothermal-chemotherapy theranostic nanoplatform (DTX/PFH@PPy-FA) for visualized treatment of breast cancer. The docetaxel (DTX) loaded perfluorohexane (PFH) nanodroplets (DTX/PFH@SPC) were firstly prepared and then coated with polypyrrole shell (PPy). Then, PEGylated folic acid was covalently modified to obtain the folate-targeted multifunctional nanoparticle (DTX/PFH@PPy-FA). Due to the good photothermal conversion performance, PPy shell can raise the temperature under the near infrared laser irradiation, which not only produces photothermal effect to kill tumor cells, but also promotes liquid-gas phase change of PFH, and produces good ultrasound imaging effect. The PPy shell also imparts photoacoustic imaging characteristics to the nanoparticles. Experimental results show that our prepared DTX/PFH@PPy-FA possesses folic acid-mediated tumor targeting ability, ultrasound and photoacoustic imaging, and photothermal-chemotherapy synergistic effect. This multi-functional nanoparticle is expected to become a new platform for the visualized photothermal-chemotherapy of breast cancer.
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Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 8
·2299-2304
·
IF 6.641
Yutong Guo,Danchen Wang,Jieai Li,Yunyu Sun,Mingtong Li,Hui Zhang,Ruomeng Duan,Dafeng Zhang,Bo Song,Bin Dong
Micropumps, especially those based on polymers, have shown great potential in sensing and mass transportation applications. However, polymer-based micropumps only exhibit a certain pumping direction, which is not adjustable, thus limiting their further applications. In this paper, a light-driven micropump with tunable pumping directions is reported. The direction control of this micropump relies on the photothermal effect of the polymeric component and the light-induced release of the encapsulated surfactant. Both on–off, inward and outward, or even the unique heartbeat-like pumping behaviors could be realized. The direction-controlled micropump has great potential for a variety of applications. Among others, it has the ability to rectify the fluid flow or accelerate the solution stirring.
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PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Shan Wan,Chun-Hui Miao,Ruo-Min Wang,Ze-Fan Zhang,Ze-Hua Dong
Conductive polypyrrole (PPy) composite films were electrodeposited on copper together with BTA or/and silica by cyclic voltammetry in salicylate solution. The corrosion resistance and electrical conductivity of the composite films were assessed by use of polarisation curves, open circuit potential (OCP) measurements and electrochemical impedance spectroscopy in 5 wt% NaCl solution. It was found that the sole doping of benzotriazole (BTA) or silica in PPy film merely improved corrosion resistance slightly, but the codoping of BTA and silica in PPy film can significantly enhance the corrosion resistance and electrical conductivity of the composite film. Salt spraying test (SST) confirmed that the ternary composite film exhibited the best anti-corrosion performance and durability, which was attributed to the synergetic effect from the physical barrier of silica and the active protection of BTA inhibitor.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2019
·Vol. 36
·期 3
·1800403
·
IF 4.194
Yuanjie Xu,Chaochao Li,Huihan Huang,Lei Huang,Luming Peng,Haibo Pan
The selective degradation of specific substances in mixed contaminants is quite challenging. And a general approach for sensitized oxide semiconductor relies on dip-coating method with sensitizer. Here, hydrophilic 2D, nest-like architecture ZnO (ZnO NA) was hydrophobicly functioned by monomolecular–layer tetraphenylporphyrin zinc (ZnTPP), where ZnTPP was synthesized by means of an in situ center-substituted (ISCS) process., i.e., the hydrogen atoms in the core of metal-free tetraphenylporphyrin (H 2 TPP) are substituted by the unsaturated zinc ions in ZnO NAs. ZnTPP/ZnO NA was exhibited with significant hydrophobicity, benefitting to absorb hydrophobic phenol (PL). Further, it is realized to selectively photodegradate PL in the mixture by ZnTPP/ZnO NAs under visible irradiation. Note that the rate of degradation to hydrophobic PL by ZnTPP/ZnO NA is 9.17 times of that for ZnO NA within 150 min; on the contrary, the degradation rate of hydrophilic rhodamine B (RhB) by ZnTPP/ZnO is reduced by 40%. Radiative lifetime of photogenerated charges is obviously increased by ZnTPP/ZnO NA compared with that of ZnTPP, indicating the effective charge separation for ZnTPP/ZnO NAs. In addition, ZnTPP/ZnO NA produced more superoxide radicals (·O 2 − ) in comparison to ZnO NA. With surface functionalization, the feasibility of selective photocatalysis under visible irradiation is demonstrated.
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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 26
·9631-9638
·
IF 4.052
Weiwei Zhao,Weikang Wang,Jiali Peng,Tiantian Chen,Beibei Jin,Shujuan Liu,Wei Huang,Qiang Zhao
Two-dimensional (2D) metal porphyrin frameworks (MPFs) with a π-conjugated skeleton, high surface area, and more accessible active sites have been applied as active materials for supercapacitors, but the poor electrical conductivity limits the enhancement of electrochemical performance. Moreover, MPF-based flexible supercapacitors have been rarely reported. Here, for the first time, we fabricated wrinkled 2D ultrathin 5,10,15,20-tetrakis(4-carboxylphenyl)porphyrin copper(II) (Cu-TCPP) nanosheets through the surfactant-assisted synthetic method. The as-obtained wrinkled Cu-TCPP nanosheets were further composited with conductive polypyrrole (PPy) to construct a flexible Cu-TCPP/PPy film through the combination of the electrophoretic deposition method and electrochemical polymerization technology. The wrinkled 2D ultrathin Cu-TCPP nanosheets not only offer macroporous channels for fast ion/electron transport, but also effectively reduce the transmission path of electrolyte ions. The PPy affords 3D conductive networks for rapid electron transport and enhances the electrochemical kinetics. The synergistic effect of Cu-TCPP and PPy leads to the enhanced supercapacitive performance of Cu-TCPP/PPy in comparison with the individual components. As a result, the freestanding Cu-TCPP/PPy electrode shows a capacitance of 340.6 mF cm−2 at 1 mA cm−2, 71.14 F cm−3 at 0.1 A cm−3, and 163.34 F g−1 at 0.2 A g−1, more than 45% greater than that of the pristine PPy film of 224.6 mF cm−2, 48.15 F cm−3 and 92.2 F g−1 at the corresponding current densities. Moreover, the fabricated binder-free symmetric supercapacitor possesses a maximum energy density of 2.27 μW h cm−2 at the highest power density of 50 μW cm−2. This work provides a new strategy to design 2D metal–organic framework-based flexible all-solid-state supercapacitors with high energy storage performances.
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RSC Advances
·
2019
·Vol. 9
·期 12
·6890-6897
·
IF 3.049
Huijun Liu,Qiang Zhao,Kewei Wang,Zhen Lu,Feng Feng,Yong Guo
In this study, polypyrrole nanofiber (PPyNF)/NiOx composites were synthesized by a simple and fast microwave method. The samples were characterized using differential scanning calorimetry and thermal gravimetric analysis (DSC/TGA), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Furthermore, the synthesized PPyNF/NiOx nanocomposites were electrochemically characterized using galvanostatic charge–discharge, cyclic voltammetry and electrochemical impedance spectroscopy (EIS) techniques. They showed the highest specific capacitance of 657 F g−1 at 0.5 A g−1, demonstrating their potential application in supercapacitors.
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JOURNAL OF POLYMER RESEARCH
·
2018
·Vol. 25
·期 12
·1-12
·
IF 1.434
Chang Dan-Dan,Yang Wei-He,Dai Xiao-Hui,Wang Ji-Xiang,Chen Li,Pan Jian-Ming,Yan Yong-Sheng,Dai Yi-Rong
Glycoporphyrin dendrimers have received increasing attentions due to their distinct physical and chemistry properties, such as fluorescence and water solubility. They also acted as a promising photodynamic therapy (PDT) sensitizer and used in the study of carbohydrate-protein interaction. In this study, different generations of porphyrin-cored dendrimers consisting of glycosylated siloxane-poly (amido amine) typed dendron (PP-Si-PAMAM-D m -Lac, m = 1, 2, and 3), multifunctional specific-targeting sensitizers, had been synthesized via click reaction. The structure of PP-Si-PAMAM-D m -Lac was characterized by 1 H NMR, GPC, FT-IR, UV-vis and fluorescence analyses. This glycoporphyrin dendrimers, not only obtained high fluorescence quantum yield and singlet oxygen production efficiency, but also showed specific recognition of lectin and remarkable temperature-responsive property (20–80 °C). These properties proved a facile click synthetic strategy of glycosylated siloxane-poly (amido amine) typed dendrimers with multiple functions as a promising tumor-selective photsensitizer (PS) for PDT and also allow applications in highly sensitive fluorescent probes over a larger temperature window.
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危险品化学品经营许可证（带存储）