JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 53
·期 17
·12374-12387
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IF 2.993
Ye Zhengqing,Wang Feijun,Jia Chao,Shao Ziqiang
Three-dimensional (3D) O, N-codoped activated carbon aerogels with ultramicropores were prepared via oxidation polymerization, freeze-drying, and carbonization/activation of aniline and sodium alginate. All the O, N-codoped activated carbon aerogels exhibit 3D interconnected hierarchical porous network structures with high specific surface areas (1337–1695 m 2 g −1 ), ultramicropores (0.52–0.54 nm), and rich O (12.68–18.48%) and N (1.18–3.59%) doping. A typical 3D O, N-codoped activated carbon aerogel (ACA700) obtained at the activation of 700 °C exhibits excellent electrochemical performance. When ACA700 is utilized as electrode materials for supercapacitor, the highest specific capacitance of 342 F g −1 at a current density of 2 A g −1 in 3 M H 2 SO 4 electrolyte is achieved. Furthermore, ACA700//ACA700 all-solid-state supercapacitor device displays acceptable energy density (3.8 Wh kg −1 ) at a power density of 246.0 W kg −1 , extraordinary coulombic efficiency (95.8%), and good rate capability. Therefore, the sustainable 3D O, N-codoped activated carbon aerogels with ultramicropores demonstrate tremendous potential for energy storage devices.
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ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Jing Chen,Huanming Wei,Haijun Chen,Wenhao Yao,Hualin Lin,Sheng Han
The N/P co-doped hierarchical porous carbon materials are synthesized by SiO 2 -template approach following potassium phosphate activation. Polyvinylidene fluoride is used as the carbon source, melamine as the nitrogen source and potassium phosphate as the phosphorus source and activator. The obtained porous carbon materials exhibit a hierarchical pore structure (∼0.6 and ∼4 nm), a large specific surface area (1431 m 2 g −1 ) and a high nitrogen and phosphorus content. These predominant characteristics enable the CNP-5-800 sample to exhibit a superior specific capacitance of 337 F g -1 at 0.5 A g −1 and outstanding cycling stability of 97.8% retention after 10000 cycles in a three-electrode system. Even in the two-electrode system (an all-solid-state symmetric capacitor), this kind of materials still can deliver an energy density of 23.1 W h kg −1 to 12.4 W h kg −1 at power densities of 720.4 W kg −1 to 13950 W kg −1 , respectively, and a cycling property of 98.7% maintenance after 5000 cycles. Therefore, the practicable synthetic method and excellent electrochemical performance make CNP- x - y materials a potential candidate in supercapacitor application.
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JOURNAL OF SOLID STATE CHEMISTRY
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2018
·
IF 2.179
Qi Tang,You Zhou,Li Ma,Mengyu Gan
The N-doped porous carbon/NiCo 2 O 4 (NPC/NiCo 2 O 4 ) substance is designed and synthesized via hydrothermal treatment , polymerization, carbonization , activation, and chemical bath deposition. The as-prepared NPC/NiCo 2 O 4 holds hemispherical flower-like structure that consists of two things: a porous bowl-shaped NPC at the inside, and sheet NiCo 2 O 4 at the whole outside, in which NPC works as a scaffold for NiCo 2 O 4 to restrain NiCo 2 O 4 nanosheets from aggregation in the synthesis process and NiCo 2 O 4 acts as a capacitive coating layer, and causing a synergic effect. The composite electrode has a specific capacitance of 948.30 F g −1 at a current density of 1 A g −1 , enhanced rate capability (727.43 F g −1 at 16 A g −1 ) and good conductivity. Additionally, NPC/NiCo 2 O 4 reaches a desirable cycling stability (87.4% capacitance retention after 2000 cycles even at a high current density of 10 A g −1 ), suggesting a hopeful electrode material for the electrochemical supercapacitors .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Yongmei Xia,Zuming He,Kejun Hu,Bin Tang,Jiangbin Su,Ya Liu,Xiaoping Li
In order to further improve the photocatalytic activity, Cu 2 O coupled with SrTiO 3 was for the first time constructed by introducing SrTiO 3 to Cu 2 O and synthesized via a two-step route. The obtained n-SrTiO 3 /p-Cu 2 O heterojunction photocatalysts were systematically characterized by XRD , XPS , SEM, UV–vis spectra, etc., showing that n-SrTiO 3 /p-Cu 2 O composites were formed by coupling SrTiO 3 submicroparticles with Cu 2 O cubic micrometer structure. Photocatalytic results demonstrated that the introduction of SrTiO 3 brought about significant enhancement of photocatalytic activity of Cu 2 O, which led to the fact that SrTiO 3 could serve as cocatalyst for the degradation of pollutant MB by forming p-n heterojunction to accelerate photo-generated charge carriers separation and migration and providing enriched active sites. The obtained n-SrTiO 3 /p-Cu 2 O heterojunction composites showed good stability and recyclability in the process of photo-degradation. Besides, the possible photocatalytic mechanism was proposed.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
·
IF 3.235
Xiaoxia Ye,Xiaofeng Yang,Piaopiao Wei,Kangbing Wu
10-Hydroxycamptothecine (10-HCPT), a natural alkaloid, is widely used in clinical practice because of its significant anti-cancer activity and small toxic side effects. In this work, graphene nanosheets (GNs) were prepared by ultrasonic exfoliation of graphite using N -methylpyrrolidone (NMP) as the solvent. The prepared GNs were characterized using transmission electron microscopy and scanning electron microscopy, and then used to construct a novel sensing platform for 10-HCPT. The electrochemical behaviors of 10-HCPT on the glassy carbon electrode (GCE) and GNs modified GCE (GNs/GCE) were studied. Compared with bare GCE, the prepared GNs/GCE increased the oxidation signal of 10-HCPT significantly, owing to larger active area of GNs/GCE and thus higher accumulation efficiency of 10-HCPT. Utilizing the signal amplification strategy of GNs, a highly-sensitive electrochemical method was established for the detection of 10-HCPT. The linear range was from 10.0 to 250.0 μg L −1 , and the detection limit was 3.21 μg L −1 (8.81 nM). It was used to detect 10-HCPT in urine samples, and satisfactory results were obtained.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2018
·
IF 2.631
Xiaojiang Liang,Shilin Ye,Qinglong Xie,Meizhen Lu,Fan Xia,Yong Nie,Zhiyan Pan,Jianbing Ji
The solubilities of sulfuryl fluoride (SO 2 F 2 ) in propylene carbonate (PC), tributyl phosphate (TBP) and N-methylpyrrolidone (NMP) was measured by isochoric saturation method at the pressure of up to 600 kPa and temperatures ranging from (293.15 to 313.15) K. Results showed that SO 2 F 2 solubility increased with increasing pressure and decreased with increasing temperature in the three solvents, and the dissolution of SO 2 F 2 in the solvents was a physical process. Moreover, Henry’s law constants and thermodynamic properties such as standard Gibbs free energy, enthalpy, and entropy changes of SO 2 F 2 solvation were further calculated according to the experimental solubility data. The solubility of SO 2 F 2 in these three solvents followed the order of TBP > PC > NMP. The results illustrated that TBP possessed the potentiality to capture SO 2 F 2 among the present absorbents due to the relatively large solubility and low absorption enthalpy for SO 2 F 2 .
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Royal Society Open Science
·
2018
·Vol. 5
·期 8
·
IF 2.504
Yuting Yan,Yanwei Cao,Chunsheng Xiao,Yang Li,Xiaoxuan Xiang,Xinhua Guo
Herein, the DNA strands containing 5′-(CGA)n and consecutive guanines are used to construct supramolecular DNA nanostructures that are size-controlled by pH values. Additionally, the introduction of thymine linkers within DNA nanostructures is necessary to maintain the stability of long-sized nanostructures. This work also demonstrates a method for accurately building DNA nanostructures.
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PubMed
高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 148
·期 9
·2636-2642
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IF 2.911
Yu Zongjiang,Zhai Guoqing,Xian Mo,Lu Ming,Wang Pengcheng,Jiang Tao,Xu Chao,Sun Weizhi
The cleavage of C–N single bonds of N -containing compounds provides either an excellent nitrogen source or an excellent carbon source. In this study, an efficient metalloporphyrins/H 2 O 2 cleavage of C–N bonds of arylpyrazoles was investigated. The effects of different factors, including different catalysts, catalyst dosages, H 2 O 2 dosages, reaction temperature and reaction time were studied. The experimental results showed that the optimal catalyst was FeTPPCl, and the yield of pyrazole derivatives could reach up to 12.3%, which was fourfold higher than hemin catalyzed reaction and closed to ceric ammonium nitrate catalyzed reaction, respectively. Compared with transition-metal-catalyzed and strong-oxidization cleavage of C–N bonds, this protocol is characterized by environmentally-friendly, stable, mild reaction conditions and simplified operation procedures. Graphical Abstract
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ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Lei Jiao,Weiqing Xu,Hongye Yan,Yu Wu,Chunrong Liu,Dan Du,Yuehe Lin,Chengzhou Zhu
Recently, in situ detection of hydrogen peroxide (H2O2) generated from live cells have caused tremendous attention, because it is of great significance in the control of multiple biological processes. Herein, Fe–N–C single-atom nanozymes (Fe–N–C SAzymes) with intrinsic peroxidase-like activity were successfully prepared via high-temperature calcination using FeCl2, glucose, and dicyandiamide as precursors. The Fe–N–C SAzymes with FeNx as active sites were similar to natural metalloproteases, which can specifically enhance the peroxidase-like activity rather than oxidase-like activity. Accordingly, owing to the excellent catalytic efficiency of the Fe–N–C SAzymes, colorimetric biosensing of H2O2 in vitro was performed via a typical 3,3′,5,5′-tetramethylbenzidine induced an allochroic reaction, demonstrating the satisfactory specificity and sensitivity. With regard to the practical application, in situ detection of H2O2 generated from the Hela cells by the Fe–N–C SAzymes was also performed, which can expand the applications of the newborn SAzymes.
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PubMed
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2017
·Vol. 164
·期 13
·A3303
·
IF 3.259
Qianqing Zhao,Mingqi Li
To develop high-capacity and low-cost carbon material, a novel high-content N, O-codoped C anode material is synthesized using melamine and glucose as starting materials. The as-prepared sample is composed of hierarchical meso-macroporous carbon bulks and graphene-like carbon sheets with 23.5 wt% N and 13.8 wt% O. The high-content N, O-codoped C exhibits high lithium storage capacity, long cycle life and excellent rate capability. At 200 mA g−1 over a voltage window of 0–3.0 V at 25°C, a discharge of about 670 mAh g−1 can be obtained after 500 cycles. Even at 1600 mA g−1, the high-content N, O-codoped C still exhibits a stable discharge capacity of 330 mAh g−1. Compared with the O-doped C and non-doped C materials, the high-content N, O-codoped C shows significant advantages in lithium storage performance, which are attributed to its high surface area, abundant porosity, graphene-like structure and rich heteroatom doping. With the rise of temperature, the lithium storage capacity of the high-content N, O-codoped C increases. With the decrease of delithation cutoff voltage, the reversible capacity of the high-content N, O-codoped C decreases. When assembled a full cell with the LiNi0.5Co0.2Mn0.3O2 cathode, a relatively stable cycling performance can be obtained.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 3
·2282-2290
·
IF 2.019
Zhao Gao-yu,Yang Shao-wei,Jiang Lin,Zhang Hong-mei
Novel Ag 10 Si 4 O 13 /N–CeO 2 composite photocatalysts were synthesized by a facile one-pot method. XRD, SEM, EDS, and UV–Vis DRS were employed to characterize the structures of the samples. Moreover, the degradation activity of methyl violet (MV) was used to measure the photocatalytic performances of Ag 10 Si 4 O 13 , N–CeO 2 , and the Ag 10 Si 4 O 13 /N–CeO 2 composites. It was found that ASO-10 (the Ag 10 Si 4 O 13 /N–CeO 2 composite with 10 mg N–CeO 2 ) showed the highest photocatalytic activity in the degradation of MV, and the enhanced photocatalytic performance is attributed to an improvement in the separation efficiency of photoproduced electron–hole pairs. Effects of operational parameters, such as initial pH, catalyst dosage, initial dye concentration, anions and cations, have also been considered for better practical applications. In addition, the photocatalytic mechanism of the Ag 10 Si 4 O 13 /N–CeO 2 composites is also proposed.
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2012
·
IF 2.947
Xing Li,Jijuan Su,Honghong Chang,Gong Li,Yanwei Li,Wenlong Wei
A simple and efficient method has been developed which describes KOH-oriented catalytic regioselective ring-opening reactions of various N -tosylaziridines with malonates. In the presence of 20 mol% KOH, most N -tosylaziridines can smoothly react with malonates to give the corresponding products in good to excellent yields (up to 99%) and with good to excellent regioselectivity under mild experimental conditions.
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危险品化学品经营许可证（带存储）