Scientific Reports
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2016
·Vol. 6
·期 1
·1-9
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IF 5.228
Ji Lvlv,Dai Yuyu,Yan Shuanma,Lv Xiaojing,Su Chang,Xu Lihuan,Lv Yaokang,Ouyang Mi,Chen Zuofeng,Zhang Cheng
A novel strategy to obtain rapid electrochromic switching response by introducing 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) moiety into polytriphenylamine backbone has been developed. The electrochromic properties of the integrated polymer film are investigated and a possible mechanism is proposed with TEMPO as a counterion-reservoir group to rapidly balance the charges during electrochromic switching, which leads to significantly improved electrochromism performance.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
ChemPlusChem
·
2015
·Vol. 80
·期 3
·606-611
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IF 3.026
Chang Su,Fang Yang,Lihuang Xu,Xiaogang Zhu,Huihui He,Cheng Zhang
Graphical Energy saving : A linear radical polymer with polytriphenylamine (PTPA) as the conductive polymer backbone and 2,2,6,6-tetramethylpiperidinyl- N -oxy (TEMPO) as pendant groups has been synthesized as an energy storage material. PTPA-TEMPO exhibited superior electrochemical performance as the cathode of lithium batteries (see figure) and was promising as an advanced cathode material. A novel radical monomer containing triphenylamine and the 2,2,6,6-tetramethylpiperidinyl- N -oxy (TEMPO) radical has been synthesized. The corresponding linear homopolymer of 4-carboxy- N , N -diphenylaniline-2,2,6,6-tetramethylpiperidin-1-yloxy (PTPA-TEMPO) was then prepared by chemical oxidative polymerization. The chemical structure and electrochemical properties of the prepared polymers were characterized by Fourier transform infrared spectroscopy, ultraviolet–visible spectroscopy, scanning electron microscopy, cyclic voltammetry, and galvanostatic charge–discharge testing by the simulated lithium-ion half-cell method. The results demonstrated that the as-synthesized functional polymers exhibited an initial discharge capacity of up to 140 mAh g −1 with two well-defined plateaus at the potential of 3.8 and 2.7 V versus Li/Li + . Furthermore, the PTPA-TEMPO electrode showed superior cycling and rate performances. The improved electrochemical performances were attributed to the construction of the novel linear radical molecular structure with PTPA as the conductive polymer backbone, which improved the long-range charge-carrier transportation and facilitated the Li + -ion insertion–extraction process in the aggregated polymer bulk during the charge–discharge process.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
RSC Advances
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2014
·Vol. 5
·期 12
·9221-9227
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IF 3.708
Wei Ni,Jianli Cheng,Xiaodong Li,Guifang Gu,Ling Huang,Qun Guan,Demao Yuan,Bin Wang
For electrochemical capacitors or supercapacitors, pseudo-capacitors via fast surface reactions are able to store/harvest more electrical energy when compared with electrochemical double layer capacitors (EDLCs) using an ion adsorption route. A combination of pseudo-capacitive materials, including oxides, nitrides and polymers, as well as understanding the charge storage mechanism and the development of advanced nanostructures with the latest generation of nanostructured lithium electrodes has brought the energy density of electrochemical capacitors closer to that of batteries. Electroactive polymeric cathodes with designed structures via electrospinning (without polymeric additives) and surfactant-free precipitation polymerization routes were herein fabricated for the abovementioned goals. The as-prepared polymeric active materials show an electrochemical capacitance of around 200 F g−1 with a higher cut-off voltage up to 4.2 V and an energy density up to 370 Wh kg−1 and power density up to 34 kW kg−1 in an organic electrolyte system.
研究领域:
材料科学
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电化学
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纳米技术
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DOI
高影响因子
MICROCHIMICA ACTA
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2018
·Vol. 185
·期 2
·1-10
·
IF 5.705
Wang Yao,Ma Ruiyang,Xiao Ruobai,Hao Lin,Wu Qiuhua,Wang Chun,Wang Zhi
A porous material (polytriphenylamine; PTPA) was synthesized by using triphenylamine as the monomer and dimethoxymethane as the cross-linker. PTPA was characterized by Fourier infrared spectrometry, X-ray diffraction measurements, scanning electron microscopy and N 2 adsorption-desorption isotherms. The PTPA has a spherical-shape morphology and relatively high specific surface area. It is shown to be a viable adsorbent for solid phase extraction of 3-chlorophenol, 2,3-dichlorophenol, 2,4-dichlorophenol and 2,4.6-trichlorophenol prior to their determination by high performance liquid chromatography-mass spectrometry. Under the optimized conditions, recoveries from spiked samples are in the range from 92.5% to 106.3%. The limits of detection range from 0.03 to 0.3 ng mL −1 (at an S/N ratio of 3) in case of bottled juice, and from 0.03 to 0.1 ng g −1 in case of tomato samples. The enrichment factors for the four analytes are in the range of 127–183 for bottle juice, and from 110–150 for tomatos. Response is linear in the range of 1.0 to 40.0 ng mL −1 for juice, and 0.3–40.0 ng g −1 for tomatos. The relative standard deviations for the determination of the chlorophenols at 20 ng mL −1 in bottled beverage, and 20 ng g −1 in tomatos are lower than 5.7%.
A polytriphenylamine polymer (PTPA) was prepared by using an external cross-linker method with triphenylamine as monomer and dimethoxymethane as cross-linker, and it was used as an adsorbent to extract chlorophenols from juice and vegetable samples.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
POLYMER
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2017
·
IF 3.684
Jiaqi Xiong,Zhi Wei,Tao Xu,Yang Zhang,Chuanxi Xiong,Lijie Dong
A novel polytriphenylamine derivative, poly(4-carbamoyl- N , N -diphenylaniline-2,2,5,5-tetramethyl-pyrrolin-1-oxyl) (PTPA-PO) has been synthesized and utilized for the fabrication of the cathode material for organic rechargeable batteries for the first time. The molecular structure, morphology, and electrochemical performance of the obtained polymers were characterized by Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–vis), scanning electron microscopy (SEM), cyclic voltammetry (CV), respectively. Additionally, the charge-discharge performance of the obtained polymers as cathode material were explored by galvanostatic charge-discharge tests. As a result, compared with PTPA, the as-prepared polymer presented an enhanced discharge capacity of 134.5 mAh·g −1 with two well-defined plateaus. Besides, the PTPA-PO, as the cathode material, exhibited an improved rate performance and remained above 90% of the initial capacity over 100 cycles. These outstanding electrochemical performances were attributed to the combination of the conducting polymer PTPA and the radical pendant PO together with the novel linear molecular structure, which not only provided a two-electron redox process , but also enhanced the charge carrier transportation along the polymer chain.
研究领域:
材料科学
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电化学
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DOI
高影响因子
ELECTROCHIMICA ACTA
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2025
·
IF 5.6
Lihuan Xu,Shutong Liu,Huisheng Liu,Chang Su
s P-type polymer as an organic-based electrode material has shown a wide application prospect in the energy storage field due to its high redox potential and good structural designability. Therein, a novel arylamine-based polymer (P (DT-TPA)), containing rich imine structure, has been synthesized via a Buchwald-Hartwig coupling reaction using 4,4′-dibromo triphenylamine and p-phenylenediamine as reactive monomers. It exhibited a polyaniline-like molecular backbone and contained abundant N redox-active centers, which provided P(DT-TPA) with the improved specific capacity and the remarkably rate performances, as the organic cathode of lithium ion batteries. Under the current density of 100 mA·g -1 , it exhibited a discharge specific capacity of 145 mAh·g -1 in the first cycle and 133.3 mAh·g -1 after 100 cycles, with a 91.93 % of capacity retention, demonstrating excellent cycling stability. Also, its discharge specific capacities were 155.8, 149, 144, 139.3 and 133.4 mAh·g -1 at current densities of 50, 100, 200, 500 and 1000 mA·g -1 , respectively. Furthermore, the research on energy storage process proved that electrode material was mainly controlled by a mixture of diffusion and capacitive kinetics process.
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 27
·22989-22995
·
IF 3.289
Chang Su,Lvlv Ji,Lihuan Xu,Ningning Zhou,Guosheng Wang,Cheng Zhang
A high free radical density polytriphenylamine derivative, poly(1-N,1-N,4-N-triphenyl-4-N-[4-(N-[4-(N-phenylanilino)phenyl]anilino)phenyl]benzene-1,4-diamine) (PFTP) has been synthesized and investigated as the cathode material of organic free radical batteries for the first time. The molecular structure, thermal-stability, morphology, spectral characteristics and electrochemical properties of the prepared polymer were characterized by Raman spectroscopy (RS), electron spin resonance (ESR), pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS), MALDI-TOF mass spectrometry, thermogravimetric analysis (TGA), ultraviolet visible spectroscopy (UV-vis), scanning electron microscopy (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Also, the charge–discharge properties of the prepared polymers were studied by galvanostatic charge–discharge testing. Compared to PTPA, it was found that PFTP not only had improved thermal stability and morphology, but also exhibited obvious four-electron redox characteristics. At a discharge current of 20 mA g−1, the PFTP electrode presented a multi-stage discharge platform and an improved discharge capacity of 74.2 mA h g−1 compared to PTPA, which could be attributed to the high free radical density and the improved morphology of the obtained novel polymer. The above exploratory work made it promising to design the multi-electron redox centers of the polytriphenylamine-based polymer to obtain improved electrochemical performance.
研究领域:
材料科学
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电化学
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高分子化学
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DOI
高影响因子
Surfaces and Interfaces
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2024
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IF 5.7
Yufeng Xiong,Yingjiang Li,Zhengfei Hu,Zhengquan Sun,Yiliang Chen,Yang Zhang,Lijie Dong
Fabricating electrodes simultaneously possessing remarkable flexibility, excellent mechanical properties, and high energy density remains a significant challenge in flexible lithium-ion batteries (LIBs). Herein, a series of flexible organic composite films were prepared with high-loading polytriphenylamine (PTPA) and the derivative (PTPA-PO) as active material, along with carbon nanotubes (CNTs) serving as conductive filler. The fabrication employed the polyethylene oxide (PEO) assisted nonsolvent (or poor solvent) induced phase separation electrospinning (NIPSE) method. Subsequently, the fiber morphology and electrochemical applications of the flexible organic composite films were systematically studied. Notably, the 60 % PTPA-PO/20 % CNTs/PEO flexible electrode with a high-loading active material of 60 wt% exhibits a significant discharge capacity of 146.6 mAh·g −1 and a favorable discharge platform ∼ 3.7 V vs. Li. Furthermore, the inherent flexibility of electrode contributes to efficient and stable transport of ions and electrons, resulting in a fine capacity retention of 93.3 % after 100 cycles. The improvement of electrochemical performance can be rationalized by the unique internal conductive network and crater-like surface structure of the fibers formed through the NIPSE method. This work provides an efficient method to fundamentally improve the energy storage performance and flexibility of LIBs.
研究领域:
材料科学
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能源存储
·
电化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）