APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shengtao Gao,Feng Wei,Xinyao Zhu,Zihao Tai,Jun Qiao
Due to the low cost and steady physicochemical properties of carbon materials, zinc-ion hybrid capacitors (ZICs) composed of carbon cathode and Zn anode have aroused considerable attracts in recent years. However, the unsatisfactory capacity and electrochemical kinetics of carbonaceous cathode hinder its application in ZICs. Herein, a facile self-template thermal treatment method was proposed to prepare N, P co-doped hierarchical porous carbons (NP-HPCs). The electronically modified NP-HPC 3 has an ultrahigh ratio of active N species and abundant micropores, which is favorable for zinc ions adsorption. In addition, the three-dimensional cross-linked network with abundant mesoporous cavities synchronously boosts electrons/ions transfer kinetics. Ex-situ characterization shows that the introduction of N, P heteroatoms is helpful to improve the adsorption of zinc ions. Thanks to these favorable structural characteristics, the NP-HPC 3 displays an exceptional specific capacitance (275.0 F g −1 at 0.1 A g −1 ) and rate capability (182.0 F g −1 at 20 A g −1 ). More significantly, the NP-HPC 3 -based ZIC delivers a prominent energy density of 107.8 Wh kg −1 at a power density of 90.7 W kg −1 , a long cycle life (96.9 % capacitance retention after 10,000 cycles) together with an outstanding anti-self-discharge performance (0.001145 V h −1 @200 h). This study not only affords a feasible and environmental route to construct advanced heteroatom doped carbonaceous materials, but also explores the interrelation between zinc ions storage behavior and structural characteristics of carbon materials.
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CHEMICAL PAPERS
·
2016
·Vol. 70
·期 7
·888-897
·
IF 1.326
Yin Zhou,Rui-Ren Tang,Dan Song
N -hydroxyphthalimide (NHPI) combined with stable and recoverable transition metal–aluminium binary hydrotalcite-like compounds (M-Al HTLcs, M = Cu, Ni, Co) as an unprecedented catalytic system was demonstrated for the allylic carbonylation, as the model reaction, of cyclic olefins with tert-butyl hydroperoxide (TBHP), using isophorone (IP) to ketoisophorone (KIP). The results showed NHPI combined with Cu-Al HTLcs to be an efficient catalytic system and the influences of various reaction conditions of the catalytic reaction were optimised. A maximum IP conversion of 68.0 % with 81.8 % selectivity to KIP was afforded under the optimal reaction conditions. Experiments of repeatability and restorability showed Cu-Al HTLcs to be stable for at least five cycles without noticeable loss of catalytic activity. Expanding substrates could also be efficiently converted to the corresponding ketones under the optimised reaction conditions with appreciable yields. A plausible catalytic reaction mechanism was proposed.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhan Cheng,Hongmin Zhu,Hanyang Ji,Zhenyu Yuan,Fanli Meng
N-butanol, a standard volatile organic compound (VOC) gas with toxicity and flammability, seriously endangers human life and health. It is imperative to achieve rapid and trace detection of n-butanol. Oxygen vacancies have been proven to be an essential factor for VOC gas adsorption at the surface of metal oxide semiconductor (MOS) gas sensors. In view of the above, BiFeO3 (BFO) nanoparticles with abundant oxygen vacancies were prepared via simple sol–gel and annealing. Crystal structure, morphology, and compositions were systematically analyzed by a series of characterizations (XRD, SEM, HRTEM, EPR, and XPS). The response of the synthesized BFO-2 sensor reached 19.37 to 100 ppm n-butanol with a detection limit of 0.28 ppm at an optimal operating temperature of 280 °C. In addition, BFO-2 also has a fast response time, good stability and repeatability, and favorable selectivity to n-butanol. It is crucial to systematically explore the excellent selectivity of BFO sensors due to their abundant oxygen vacancies and large intrinsic crystal defects. Herein, adjusting the calcination temperature is one constructive strategy to tune the oxygen vacancy, which would prompt the gas sensing performance of BFO sensors to n-butanol.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Shumeng Wu,Caixia Feng,Bingbing Fan,Yonghong Li,He Wang,Yanmei Zhou
Heteroatoms-doped hierarchical porous carbons have attracted considerable interest owing to their efficient utility in supercapacitors . However, the increase of defects tends to sacrifice the electrical conductivity of carbon materials. Therefore, it is of great significance to build a good conductive network by increasing the graphitization degree of porous carbons . Here, this study reports the use of serine phosphate protic salt ([Seri][H 2 PO 4 ]), Pluronic F127 and cobalt nitrate to engineer the N/O/P co-doped hierarchical porous graphitic carbon materials. The Co 2+ catalyzes the graphitization of porous carbons under high temperature. A large number of mesopores, highly doped heteroatoms (O: 4.2 wt%, N: 4.07 wt%, P: 0.81 wt%) and conductive carbon skeleton boost the ultrafast transport of electrons and ions, resulting in high specific capacitance, wide operating voltage and outstanding rate performance. The symmetric supercapacitor assembled in KOH electrolyte shows good frequency response with the scan rate up to 1.5 V s −1 on the working voltage of 0–1.3 V. At the same time, when the power density reaches up to 21.3 kW kg −1 , its energy density remains 8.74 W h kg −1 . Furthermore, the symmetric supercapacitor delivers a high energy density of 81.42 W h kg −1 at the power density of 875 W kg −1 with an ultrahigh working voltage of 3.5 V in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF 4 ) electrolyte. More promisingly, all-solid device based on the optimized sample exhibits outstanding flexibility, which greatly broadens its practicability. This work marks the importance of the balance between porous structure, heteroatom doping and high conductivity for advanced supercapacitors .
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Yan Zhao,Luyi Yang,Yunxing Zuo,Zhibo Song,Fang Liu,Ke Li,Feng Pan
Employing conductive binders in silicon (Si) anode has been considered as a fundamental solution to the pulverization of Si particles. Therefore, it is still a great challenge to improve the charge transfer capability of the conductive binder. Herein, a copolymer (PFPQ-COONa) is synthesized, characterized, and electrochemically tested as conductive binder for Si anode. It is found that PFPQ-COONa exhibits not only excellent cycling stability, but also satisfactory rate performance with relatively high areal loading, which outperforms currently reported single-component conductive binders. The superior electrochemical performance can be attributed to the molecular-level contact between binder and Si particles and to the enhanced intrinsic conductivity of PFPQ-COONa at reductive potential. This method provides a fresh perspective to design and develop conductive binder for high-capacity battery anode.
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PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2017
·Vol. 35
·期 10
·1268-1275
·
IF 1.692
Peng Xin,Liu Tian-qi,Shang Cong,Jiao Chen,Wang Hui-liang
Simple preparation of stimuli-responsive hydrogels with good mechanical properties and mild stimuliresponsiveness is essential for their applications as smart soft robots. Mechanically strong Janus poly( N -isopropylacrylamide)/graphene oxide (PNIPAM/GO) nanocomposite hydrogels with stimuli-responsive bending behaviors are prepared through a simple one-step method by using molds made of a Teflon plate and a glass plate. Residual oxygen in the air bubbles on the Teflon plate surface affects the polymerization and hence the cross-linking density, leading to the different swelling/deswelling rates of the two sides of the gels. Therefore, the hydrogels exhibit bending/unbending behaviors upon heating/cooling in water. The incorporation of GO nanosheets dramatically enhances the mechanical properties of Janus hydrogels. Meanwhile, the photo-responsive property of the GO nanosheets also imparts the hydrogels with remotecontrollable deformation under IR irradiation. The application of the Janus PNIPAM/GO hydrogels as thermo-responsive grippers is demonstrated.
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RSC Advances
·
2014
·Vol. 5
·期 9
·6666-6674
·
IF 3.708
Linlin Duan,Wei Huang,Yatao Zhang
N-Halamine grafted halloysite nanotubes (N-halamine@HNTs) were used as an antibacterial agents to fabricate polyethersulfone (PES) ultrafiltration (UF) hybrid membranes. N-Halamine@HNTs were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectra (XPS). The chemical compositions, storage modulus, tan δ, morphology and performance of the membranes were characterized by attenuated total reflection-Fourier transform infrared spectra (ATR-FTIR), dynamic mechanical analysis (DMA), water contact angle, scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), overall porosity and pore size measurements. The results showed that the hydrophilicity of the membranes was improved greatly after adding N-halamine@HNTs. Water flux of the hybrid membrane could reach as high as 248.3 L m−2 h−1 when the content of N-halamine@HNTs was 1.0 wt%. In addition, the antibacterial test indicated that the hybrid membranes showed good antibacterial activity against E. coli.
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CATALYSIS LETTERS
·
2018
·Vol. 148
·期 8
·2418-2431
·
IF 2.911
Sun Rong,Huang Wan,Zhang Qian,Hong Jun-ming
Abstract This study developed nitrogen-doped graphene/Pt/TiO 2 (N-GN/Pt/TiO 2 ) as anode to effectively degrade aminophenol (APAP) in electrocatalytic process. Due to the different physicochemical properties of graphene with various N species loading, the efficiency of catalysts was novelty discussed. The morphology, N-doped content/species, and the graphene defects of the catalyst were analyzed by TEM, FTIR, XPS, EA, and Raman spectroscopy. The results show that the doping morphology of the N atoms gradually shifted from pyridinic N and pyrrolic N to graphitic N with increased hydrothermal time, in order to decrease the defect degrees and redox activity. However, the conductivity of material increased with the graphitic N generation. The best APAP degradation efficiency (100% with 20 mA, 1 g/L NaCl, and initial pH 3.0) can be achieved with 1.5-N-GN/Pt/TiO 2 (mainly pyridinic N and pyrrolic N doping). A detailed investigation was conducted to determine the oxidation intermediates of APAP using GC-MS analysis. Finally, a possible degradation pathway was proposed. Graphical Abstract
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Catalysts
·
2022
·Vol. 12
·期 12
·1496
·
IF 4.501
Fengyun Su,Zhishuai Wang,Haiquan Xie,Yezhen Zhang,Chenghua Ding,Liqun Ye
Hydrogen evolution by photocatalytic technology has been one of the most promising and attractive solutions, and can harvest and convert the abundant solar energy into green, renewable hydrogen energy. As a new kind of photocatalytic material, graphitic carbon nitride (g-C3N4) has drawn much attention in photocataluytic H2production due to its visible light response, ease of preparation and good stability. For a higher photocatalyic performance, N defects were introduced in to the traditional g-C3N4in this work. The existence of N defects was proved by adequate material characterization. Significantly, a new absorption region at around 500 nm of N-deficient g-C3N4appeared, revealing the exciting n-π* transition of lone pair electrons. The photocatalytic H2production performance of N-deficient g-C3N4was increased by 5.8 times. The enhanced photocatalytic performance of N-deficient g-C3N4was attributed to the enhanced visible light absorption, as well as the promoted separation of photo-generated carries and increased specific surface area.Keywords:N defects;g-C3N4;H2evolution;photocatalysis;n-π* transition
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Zhi Hua Zhang,Li Xia Chen,Yun Qian Zhang,Qian Jiang Zhu,Kai Chen,Zhu Tao
The anion-induced outer surface interaction of Q[n]s is an important driving force in the construction of Q[n]-based supramolecular frameworks. In this work, a symmetric tetramethyl-substituted cucurbit[6]uril (TMeQ[6]) is selected as the basic structural block. Using the anion-induced outer surface interaction of Q[n]s derived from [CdxCly]n− anions formed by Cd2+ cations in a HCl medium, four different TMeQ[6]-[CdxCly]n−-based supramolecular frameworks are constructed. Three of the most common TMeQ[6]-[CdxCly]n−-based supramolecular frameworks are selected for further vulcanization, and three different CdS/TMeQ[6]-based framework catalysts with different structures and properties are obtained. The catalytic activities of these three CdS/TMeQ[6]-based framework catalysts are investigated by the coupling photocatalytic reaction of aminobenzyl, and the results showed that the catalytic activities of the three catalysts are all higher than that of pure CdS. Therefore, this work establishes that it is possible to establish a method for synthesizing the Q[n]-based framework-supported catalysts by first synthesizing TMeQ[6]-[CdxCly]n−-based supramolecular frameworks and then forming Q[n]-based framework supported catalysts by sulfurization or reduction.
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PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1060
·
IF 3.9
Wei Gao,Fang Gao,Haikuan Yang,Zongde Wang,Yaru Huang
Pyranoquinolinones synthesized from citral were used for Cu-catalyzedN-arylation with a wide range of arylboric acids. The reaction proceeded well with a broad substrate scope, providing a direct way to access highly functional pyranoquinolinone core structure derivatives in yields of up to 80%. Compared to citral, the compounds we obtained have a much better inhibitory effect on HeLa cervical cancer cells, and compound3phas an IC50value of 4.6 μM, lower than cisplatin’s 5.9 μM.Keywords:citral;pyranoquinolinone;N-arylation
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jun Jiang,Teng Li,Kexin Huang,Guangyu Sun,Jing Zheng,Jinlong Chen,Weiran Yang
As a bio-based platform chemical, it is desirable to convert levulinic acid (LA) to varieties of value-added biochemicals. n-Butane, mainly from nonrenewable fossil resources, is a basic chemical to produce some important chemicals, such as butadiene and ethylene. In this paper, 95.5% yield of n-butane was obtained from LA in one-step over base-treated Pt/C at around 300 °C in 4 h. The reaction pathway was confirmed to be the hydrodeoxygenation of LA to valeric acid (VA) and then the VA decarboxylation to n-butane by kinetic studies. Base-treated Pt/C had better reactivity due to its improved decarboxylation activity. Detailed characterization of the catalyst revealed that the Pt particle size is the key reason for the activity improvement, and further studies showed that Pt nanoparticles with a size of 2–4 nm showed the highest decarboxylation activity. This is the first report on the direct conversion of LA to n-butane.
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