JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Yiqi Wei,Yinglin Yan,Yiming Zou,Mangmang Shi,Qijiu Deng,Nana Zhao,Juan Wang,Rong Yang,Yunhua Xu
Lithium-sulfur (Li-S) battery with high theoretical capacity (1675 mAh g −1 ) and energy density (2600 Wh kg −1 ) is principally considered as an attractive alternative for state of art Li-ion batteries. In this study, a series of ternary composites were synthesized with bamboo-derived hierarchical carbon (BDC) to load S and flexible polyaniline (PANI) as a coating layer. The BDC/S composite was encapsulated by different weight percentage of PANI. The ternary PANI@BDC/S composites were characterized detailly by structural and electrochemical analysis and the results revealed that the PANI@BDC/S-20% electrode presented a thin and uniform PANI coating. As a cathode material for Li-S battery, the PANI@BDC/S-20% electrode exhibited the highest initial capacity (1463 mAh g −1 at 0.1C), outstanding long-life performance (366 mAh g −1 at 0.5C after 500 cycles), excellent rate property (527 mAh g −1 at 2C). The incremented gains were mainly because thin PANI coating was polymerized along with the porous carbon walls of BDC substrate, leaving an excellent hierarchical porous microstructure. The specific structure showed great physical confinement for polysulfides , meantime, the polysulfide migration could be restricted by heteroatom (N atom) doped on the PANI backbone. The soft and stable PANI shell reduce volume expansion during cycles, providing an integrated conductive framework for enhancing the electrochemical contact between S particles and carbon substrate. More important, the modified polar interface contributed to stable SEI formation. Such a novel design of cathode material demonstrated great potential for practical applications in Li-S batteries.
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高影响因子
HIGH PERFORMANCE POLYMERS
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2019
·
IF 1.584
Yayun Zheng,Xing Yang,Meng Yuan,Jujie Luo
Two novel gas separation membranes (Phenyl(Ph)-poly(ether ether ketone)s (PEEKs) and PEEKs) based on PEEKs with a high fractional free volume were designed and synthesized. The structure and thermodynamic stability of the membranes were investigated using Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and thermogravimetric analysis. The two membranes, which were determined to be high-molecular weight polymers by gel permeation chromatography, showed good solubility in a weakly polar solvent. The gas transport properties of the Ph-PEEK membranes were investigated for different gases (CO2, O2, CH4, and N2) at 25°C and 1 atm. The Ph-PEEK-3 membrane with the largest free volume had the largest gas permeability coefficient and maintained good selectivity. The effect of operating temperature on the gas permeation of the Ph-PEEK-3 membrane was also investigated, and the maximum permeability of the four single gases was reached at 55°C and 1 atm.
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高影响因子
COLORATION TECHNOLOGY
·
2019
·Vol. 135
·期 5
·335-348
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IF 1.241
Qiushui Zhang,Wei Xiong,Shufen Zhang,Wei Ma,Bingtao Tang
A new kind of hetero-bifunctional reactive dye containing 2-ethoxy-4-chloro- s -triazine, with better activity matching with β-hydroxyethyl sulphone sulphate at a low fixation temperature, was successfully synthesised and characterised. An ethoxy group was designed to be introduced into triazine to increase the substantivity and the reactivity of the dyes. Thereby, the fixation of mono- s -chlorotriazine/hydroxyethyl sulphone sulphate (KM-type) bifunctional reactive dyes on cotton was improved, and dyeing under mild conditions with high fixation was realised. Nineteen dyes with orange, red and blue colours were synthesised and characterised by UV-Vis and infrared spectroscopy and mass spectrometry. Synthesised dyes were dyed at 60, 75 and 90°C, respectively. Exhaustion and reactivity for all of the ethoxy-containing KM-type dyes was over 90% at the optimal temperature, and fixation was over 87%, which was higher than the ethoxy-free comparative dyes. The optimal fixation temperature of ethoxy-containing dyes was initially reduced to 75°C, and then to 60°C. Compared with comparative dyes, the wash fastness and light fastness were basically unchanged, and the wet rub fastness of the H-acid series was reduced by one grade.
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高影响因子
Materials Today Communications
·
2019
·
IF 1.859
Xunan Shen,Chao Zhang,Yang Feng,Wei Li,Guifeng Chen,Chengchun Tang
In this work, Cu 2 ZnSn(S,Se) 4 thin films were prepared by sol-gel methods based on dimethyl sulfoxide solutions with H 3 BO 3 additive. The morphological, structural, compositional and photovoltaic properties of the Cu 2 ZnSn(S,Se) 4 thin films were investigated. We found that the formation of voids, cracks and fine-grain layers were suppressed effectively with slight H 3 BO 3 . Based on the decrease of these micro defects, the series resistance decreased and shunt resistance increased largely. And the band gap of CZTSSe solar cells broaden from 1.031 eV to 1.064 eV. The best solar cell showed an open-circuit voltage of 440.1 mV, short-circuit current density of 28.15 mA/cm 2 , fill factor of 58.81% and power conversion efficiency of 7.27% under air mass 1.5 (100 mW/cm 2 ) illumination.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 26
·48830
·
IF 2.188
Gang Wang,Fei Wang,Anfeng Li,Miaomiao Zhang,Jie Zhang,Jinwei Chen,Ruilin Wang
The SPEEK/s-TiO 2 composite membrane was prepared by blending sulfonated poly(ether ether ketone) (SPEEK) and sulfonated titanium dioxide (s-TiO 2 ) nanoparticles. The important physiochemical parameters such as proton conductivity, water uptake, swelling degree and ion exchange capacity of the composite membrane were measured. The thermal stability and chemical stability were also tested. It was observed that the SPEEK/s-TiO 2 composite membrane exhibited the best selectivity (7.13 × 10 4 S·min·cm −3 ) accompanying high proton conductivity (0.061 S·cm −1 ) and low tetravalent vanadium ion (VO 2+ ) permeability (8.55 × 10 −7 cm 2 ·min −1 ) compared with Nafion117, SPEEK and SPEEK/TiO 2 membranes. The battery performance with these membranes was characterized by charge–discharge cycling tests and it was found that the SPEEK/s-TiO 2 composite membrane showed the highest energy efficiency (EE) up to 82.3%, indicating the SPEEK/s-TiO 2 composite membrane is a candidate for vanadium redox flow battery (VRFB) application. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48830.
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高影响因子
POLYMER
·
2018
·
IF 3.483
Cuihong Jin,Xiuling Zhu,Shuai Zhang,Shuai Li
In this work, a series of long flexible alkylsulfonated side chains poly (phthalazinone ether ketone) (SFG-PPEK-x) are successfully synthesized through polycondensation , demethylation , and sulfobutylation grafting reaction to the polymer backbone. The resulting ionomers could dissolve in polar aprotic solvents , such as DMSO , NMP etc and show excellent film-forming properties. Furthermore, the effect of side chain lengths on the properties of the resulting PEMs, such as proton conductivity, water uptake, and swelling ratio are investigated systematically. The SFG-PPEK-4 membranes (IEC = 1.70 mmol g −1 ) show the highest proton conductivity in the range of 107 mS cm −1 at 30 °C and 184 mS cm −1 at 80 °C, which is higher than that of Nafion ® 115. The thermal, mechanical properties and chemical stability of SFG-PPEK-x are discussed, systematically.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Mingquan Liu,Silu Huo,Min Xu,Linlin Wu,Mingjie Liu,Yifei Xue,Yi-Ming Yan
Nitrogen and sulfur co-doped carbon (NSC) is considered as a promising electrode material for supercapacitors (SCs). However, the specific capacitance and the rate performance of NSC are not satisfied for practical applications due to its inappropriate structural properties. Herein, we report the structural engineering of NSC by optimizing pore structure to obtain an ordered hierarchical pore network. The as-prepared NSC possesses a high gravimetric capacitance of 322 F g -1 at the current density of 1.0 A g −1 and retains 206 F g −1 (64% of its capacitance at 1.0 A g −1 ) at the high current density of 100 A g −1 . Moreover, it reveals an excellent cycling performance with ∼93.4% capacitance retention after 10000 cycles at the current density of 20 A g −1 . An assembled symmetric supercapacitor (SC) shows a remarkable energy density of 11.4 Wh kg −1 and a high power density of 12.9 kW kg −1 . The outstanding performances of NSC electrodes benefit from the efficient ion diffusion and fast charge transfer. This work paves a way to rationally design and engineer the structure of NSC for achieving both high rate capability and high specific capacitance for SCs applications.
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高影响因子
SYNTHETIC METALS
·
2018
·
IF 2.526
Junlong Niu,Liangmei Rao,Ping Liu,Wenwen Zhang,Wenna Zhang,Yinxiu Zuo,Keke Chai,Shuai Chen,Jingkun Xu,Xuemin Duan
Two novel chiral 3,4-dihydro-2 H -thieno[3,4- b ][1,4]dioxepine (ProDOT)-based electrochemical sensor , employing a pair of glassy carbon electrodes modified with chiral poly(2-Phenyl-propionic acid 3,4-dihydro-2 H -thieno[3,4- b ][1,4]dioxepin-3-ylmethyl ester) (PProDTM-PP), were utilized for the enantioselective detection of chiral 3,4-dihydroxyphenylalanine (DOPA). The enantioselective recognition between chiral PProDTM-PP modified glassy carbon electrodes and chiral DOPA was studied by using different electrochemical technologies. The redox activity and electrochemical stability of chiral PProDTM-PP was good. ( R )-PProDTM-PP and ( S )-PProDTM-PP showed higher peak current responses toward D -DOPA and L -DOPA, respectively. Furthermore, the recognition efficiencies of chiral PProDTM-PP are between 1.48 and 1.89, which is higher than chiral PEDOT-based electrochemical sensors (around 1.10). The chiral PProDTM-PP provides an alternative to chiral recognition.
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ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
·
2018
·Vol. 37
·期 10
·2560-2565
·
IF 3.179
Dong Zhou
Because of increasing concerns about its toxic effects, bisphenol A (BPA) has been gradually replaced in industrial applications by analogs such as bisphenol S (BPS). Few comparative toxicity evaluations of bisphenol analogs have been done. In the present study, 72-h exposure in L1 larvae of the model animal Caenorhabditis elegans was used to evaluate low-concentration BPS toxicity. Multiple indicators at the physiological, biochemical, and molecular levels were tested. At the physiological level, BPS exposure resulted in significantly negative effects at treatments >1 µM, with head thrash being the most sensitive endpoint. At the biochemical level, BPS exposure induced no significant oxidative stress, but significantly increased apoptosis at 1 µM. At the molecular level, BPS exposure induced small but significant variations in most stress-related gene expressions at all doses. In addition, the transgenic nematode TJ375 cell line with the green fluorescent protein–based reporter hsp-16.2 was used to determine stress responses; it was found that TJ375 was not sensitive to BPS exposure. Compared with the effects of BPA shown in our previous 2016 study, the overall results showed that BPS was less noxious to C. elegans than BPA. These toxicity data for BPS could provide a foundation to evaluate the comparative toxicity of BPA alternatives. Environ Toxicol Chem 2018;37:2560–2565. © 2018 SETAC
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PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2018
·Vol. 12
·期 3
·346-357
·
IF 2.643
Zhang Chao,Lu Chenbao,Bi Shuai,Hou Yang,Zhang Fan,Cai Ming,He Yafei,Paasch Silvia,Feng Xinliang,Brunner Eike,Zhuang Xiaodong
Porous polymers have been recently recognized as one of the most important precursors for fabrication of heteroatom-doped porous carbons due to the intrinsic porous structure, easy available heteroatom-containing monomers and versatile polymerization methods. However, the heteroatom elements in as-produced porous carbons are quite relied on monomers. So far, the manipulating of heteroatom in porous polymer derived porous carbons are still very rare and challenge. In this work, a sulfur-enriched porous polymer, which was prepared from a diacetylene-linked porous polymer, was used as precursor to prepare S-doped and/or N-doped porous carbons under nitrogen and/or ammonia atmospheres. Remarkably, S content can sharply decrease from 36.3% to 0.05% after ammonia treatment. The N content and specific surface area of as-fabricated porous carbons can reach up to 1.32% and 1508 m 2 ∙g –1 , respectively. As the electrode materials for electrical double-layer capacitors, as-fabricated porous carbons exhibit high specific capacitance of up to 431.6 F∙g –1 at 5 mV∙s –1 and excellent cycling stability of 99.74% capacitance retention after 3000 cycles at 100 mV∙s –1 . Furthermore, as the electrochemical catalysts for oxygen reduction reaction, as-fabricated porous carbons presented ultralow half-wave-potential of 0.78 V versus RHE. This work not only offers a new strategy for manipulating S and N doping features for the porous carbons derived from S-containing porous polymers, but also paves the way for the structureperformance interrelationship study of heteroatoms codoped porous carbon for energy applications.
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高影响因子
Micro & Nano Letters
·
2018
·Vol. 13
·期 10
·1373-1377
·
IF 0.841
Hui Zhao,Yuqing Miao
The Ni–W–S nanoparticles (NPs) were synthesised on Ti mesh through the typical hydrothermal method. The obtained Ti/Ni–W–S was characterised on morphology, composition and electrocatalytic property. It showed good electrocatalytic performance towards glucose oxidation in strong alkali electrolyte, exhibiting the potential application in the field of fuel cell. The excellent electrocatalytic activity of Ni–W–S NPs, the favourable electron transfer between electrode and catalysts, as well as the high conductivity of Ti contributed to its final catalytic performance of Ti/Ni–W–S.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2018
·
IF 3.609
Songpu Cheng,Xiaohong Xia,Hongbo Liu,Yuxi Chen
To suppress shuttling effect and improve electrochemical performance of the sulfur cathode for lithium-sulfur batteries, core-shell structured MoS 2 @S spherical cathode has been synthesized through a chemical route using MnCO 3 as template. The MoS 2 shells consist of MoS 2 nanosheets . For comparison, MoS 2 /S cathode has also been synthesized through melting and diffusion of sulfur to commercial MoS 2 powders. The electrochemical performance of the MoS 2 @S and MoS 2 /S cathodes have been evaluated using cyclic voltammetry , discharge/charge cycling, electrochemical impedance spectroscopy coupled with impedance fitting. The electrochemical performance of the MoS 2 @S spherical cathode has been much improved compared with that of MoS 2 /S. The capacity of the MoS 2 @S spheres can reach 1185.7 mA h g −1 at 0.2 C and 955.1 mA h g −1 at 1 C with initial-cycle coulombic efficiency of 90%. The capacity fading of each cycle is 0.1% during 200 lithiation/delithiation cycles. The MoS 2 @S spherical cathode with high cyclic capacity and stability is promising cathode candidate for lithium-sulfur batteries.
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危险品化学品经营许可证（带存储）