ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Kuiyong Chen,Xiaobin Huang,Chaoying Wan,Hong Liu
Hybrid hollow polymeric microspheres (HPMSs) are synthesized by encapsulating the supramolecular vesicles with polyphosphazene through a rapid one-step polycondensation reaction . Subsequent carbonization treatments of the HPMSs lead to corresponding hollow carbon microspheres (HCMSs) with well-preserved geometry. The sizes of HPMSs and HCMSs are controlled by the vesicles, which is directly determined by the feeding ratio of the assembly units. Electrodes based on HCMSs showed a specific capacitance of 314.6 F/g at a current density of 0.2 A/g in 6 M KOH electrolyte, 180.0 F/g at a current density of 30 A/g, and high stability of 98.2% of capacity retention after 2000 cycles. Both the high surface area and high heteroatoms level of HCMSs contribute to the excellent capacitive performance. Meanwhile, the hollow carbon structure ensured the satisfactory capacitive performance by increasing utilization efficiency of the surface area as well as achieving short diffusion paths for electrolyte ions .
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
高分子化学
·
表面科学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2013
·Vol. 5
·期 6
·2057-2064
·
IF 5.231
Cheng'an Cao,Xiaodong Zhuang,Yuezeng Su,Yi Zhang,Fan Zhang,Dongqing Wu,Xinliang Feng
Graphene carbanions were prepared and used as initiators for the anionic polymerization of acrylonitrile on a graphene surface. The obtained nanosheets of polyacrylonitrile-grafted reduced graphene oxide (PAN-g-RGO) show high dispersibility in various organic solvents such as dimethylformamide and tetrahydrofuran (∼2 mg mL−1), large aspect ratio, and low thickness, and can be used as precursors for the construction of nitrogen-doped carbon nanosheets (NCNSs). The nitrogen content of the NCNSs can reach up to 11.2 wt% after the thermal treatment of PAN-g-RGO at 600 °C. Remarkably, such NCNSs exhibit a large surface area (∼217 m2 g−1) and outstanding electrochemical performance for the oxygen reduction reaction (n = ∼3.9, JK = ∼21.1 mA cm−2, and half-wave-potential = ∼0.24 V) in 0.1 M KOH. The synthetic strategy described in this work provides a new and easy access to two-dimensional polymer brushes as well as to porous carbon nanosheets with unique functional properties.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源化学
·
催化化学
✓ 已验证
DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2020
·
IF 6.513
Rong Zhang,Yanlan Ma,Wenting Lan,Dur E Sameen,Saeed Ahmed,Jianwu Dai,Wen Qin,Suqing Li,Yaowen Liu
Polyacrylonitrile (PAN)/β-cyclodextrin (β-CD) composite nanofibrous membranes immobilized with nano-titanium dioxide (TiO 2 ) and graphene oxide (GO) were prepared by electrospinning and ultrasonic-assisted electrospinning. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and X-ray diffraction (XRD) confirmed that TiO 2 and GO were more evenly dispersed on the surface and inside of the nanofibers after 45 min of ultrasonic treatment. Adding TiO 2 and GO reduced the fiber diameter; the minimum fiber diameter was 84.66 ± 40.58 nm when the mass ratio of TiO 2 -to-GO was 8:2 (PAN/β-CD nanofibrous membranes was 191.10 ± 45.66 nm). Using the anionic dye methyl orange (MO) and the cationic dye methylene blue (MB) as pollutant models, the photocatalytic activity of the nanofibrous membrane under natural sunlight was evaluated. It was found that PAN/β-CD/TiO 2 /GO composite nanofibrous membrane with an 8:2 mass ratio of TiO 2 -to-GO exhibited the best degradation efficiency for the dyes. The degradation efficiency for MB and MO were 93.52 ± 1.83% and 90.92 ± 1.52%, respectively. Meanwhile, the PAN/β-CD/TiO 2 /GO composite nanofibrous membrane also displayed good antibacterial properties and the degradation efficiency for MB and MO remained above 80% after 3 cycles. In general, the PAN/β-CD/TiO 2 /GO nanofibrous membrane is eco-friendly, reusable, and has great potential for the removal of dyes from industrial wastewaters.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2014
·Vol. 18
·期 9
·2625-2635
·
IF 2.234
Wu Yan-Ying,Li Cong,Dou Zhi-Yu,Cui Li-Li,Liu Da-Jun,He Xing-Quan
In this paper, we present a two-step covalent modification approach to fabricate a novel nitrite sensor through anchoring nickel-tetrahydroxy-phthalocyanine (NiPc(OH) 4 ) and polyethylene oxide (PEO) onto a glassy carbon electrode (GCE). The surface morphology of the prepared NiPc(OH) 4 /PEO composite films under different dry conditions was characterized by scanning electron microscopy (SEM). The electrochemical behavior of NiPc(OH) 4 /PEO composite film modified GCE toward the catalytic oxidation of nitrite in pH 7.0 phosphate buffer solution (PBS) was investigated by cyclic voltammetry (CV). After drying under an infrared lamp, the fabricated sensor showed a pronounced electrocatalytic activity improvement toward the oxidation of nitrite and led to a significant decrease in the anodic overpotentials compared with bare GCE, which should be ascribed to the synergistic effect of NiPc(OH) 4 and PEO, as well as the enlarged electrochemical effective surface area after drying. Using differential pulse voltammetry (DPV), the sensor gave a linear response to nitrite over the concentration range of 0.1–5,300 μM, with a detection limit of 0.0522 μM. The nitrite sensor exhibits good sensitivity, selectivity, and stability and has been applied for the determination of nitrite in water samples.
研究领域:
生物医学工程
·
电化学传感
·
环境监测
·
分析化学
·
功能材料
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Shuxin Zhang,Yan Huang,Yanna NuLi,Baofeng Wang,Jun Yang,Jiulin Wang
Magnesium–sulfur (Mg–S) batteries have received extensive attention due to the high theoretical energy density, low cost, high safety, and environmental friendliness. In this work, sulfurized pyrolyzed polyacrylonitrile (S@pPAN) composite is used as a cathode material of Mg–S batteries, and a comparative study on the effects of different binders on the electrochemical performance is reported for the first time. The selected binders are commercial organic-soluble poly(vinylidene fluoride) (PVDF) and water-soluble poly(ethylene oxide) (PEO), sodium polyacrylate (PAAS), locust bean gum (LBG), guar gum (GG), carboxymethyl cellulose (SCMC), and β-cyclodextrin (β-CD). The binders significantly affect the physical properties of S@pPAN electrodes and thus the electrochemical performance of the batteries. Compared to the traditional PVDF binder and other water-soluble binders, the S@pPAN electrode with an amorphous PAAS binder has better cycle stability and rate capability. The three-dimensional (3D) network formed from PAAS cross-linking improves the cohesion among the electrode constituents, and the adhesion between the electrode laminate and the current collector maintains the uniformity of electrode surface after cycling. The present work demonstrates the feasibility of using green aqueous binders to enhance the electrochemical performance of Mg–S batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Journal of Sulfur Chemistry
·
2022
·
IF 2.325
Ling Jiang,Qingqing Lu,Qianqian Huang,Yue Cheng,Xiaohe Chu
In this paper, a simple and environment-friendly protocol was developed for the synthesis of arylsulfonyl 4H-pyrans via L-proline-catalyzed one-pot two-step reaction of aromatic aldehyde with phenylsulphonyl acetonitrile and dimedone under ball-milling conditions. Environmental acceptability, wide substrate scope, low cost and operational simplicity are the key features of this method.
研究领域:
有机化学
·
绿色化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xinxing Zhang,Zhiru Wang,Rui Ding,Lei Sun,Wenzhong Yang,Hui Xu
In this work, the metal–organic framework (MOF) particles (i.e., UiO-66-NH 2 ) was covalently modified with poly(4-vinylpyridine) (P4VP) through surface-initiated atom transfer radical polymerization (SI-ATRP) method. The hair MOF product, referred to as UiO-66- g -P4VP, was then subjected to quaternization with 1-bromoethane, resulting in UiO-66-g- q P4VP (quaternized P4VP is denoted as q P4VP). Finally, these UiO-66-g- q P4VP particles were incorporated into a polymer matrix made of polyacrylonitrile (PAN) to develop a nanofibrous composite membrane using the electrospinning technique. After modification of quaternized P4VP, the surface of the MOFs carry strong positive charges. Therefore, the electrospun UiO-66- g - q P4VP/PAN nanofiber membrane can serve as an adsorbent in efficient removal of negatively charged arsenate through strong electrostatic interactions. The adsorptive efficacy of the nanofiber membrane exhibited considerable stability within the pH spectrum extending from 4 to 10, indicating that the membrane could potentially maintain its functionality across a broad range of pH conditions. Our developed approach opens up an avenue for manufacturing of polyelectrolyte-functionalized MOF nanofiber membranes, which hold great promise for application in water remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Chuankai Fu,Yulin Ma,Pengjian Zuo,Wei Zhao,Weichao Tang,Geping Yin,Jiajun Wang,Yunzhi Gao
Solid-state electrolytes with high room temperature ionic conductivity , broad electrochemical window, and favorable thermal stability are crucial for the practical application of all-solid-state lithium-metal batteries. Here, a novel succinonitrile (SN)-based composite solid-state electrolyte (SN-CSSE) is fabricated directly inside the glass-fiber (GF) membrane via in-situ thermal-crosslinking ethoxylate trimethylolpropane triacrylate (ETPTA) monomer , coupled with the liquid SN-based electrolyte. The ionic conductivity, oxidation potential and lithium-ion transference number (T Li + ) of SN-CSSE are 0.78 mS/cm, 5.20 V (vs. Li/Li + ) and 0.68 at ambient temperature, respectively. The coin full cells equipped with high-voltage LiCoO 2 (LCO) and modified Li metal anode deliver excellent interfacial stability, cycling reversibility , and rate capability. Moreover, the LCO/SN-CSSE/Li pouch cell exhibits more superior thermal stability than that of cell with commercial carbonate-based electrolyte during thermal shock test.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 15
·期 5
·4722-4738
·
IF 1.5
Wen Liu,Yueli Shi,Quanchao Zhuang,Yongli Cuiab,Zhicheng Ju,Yanhua Cui
The effect of ethylene glycol bis(propionitrile) ether(DENE) as a novel electrolyte additive on the electrochemical performance of a graphite anode was studied in this paper. Fourier transform infrared spectroscopy(FTIR), charge/discharge tests, cyclic voltammetry(CV), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), and electrochemical impedance spectroscopy(EIS) were used to investigate the SEI film and the cycle performance of graphite anode. The initial charge capacities of the graphite electrode in the electrolytes without and with 1% DENE were 319 mAhg −1 and 349 mAhg −1 , respectively. After 60 cycles, the charge capacities without and with 1% DENE were 315 mAhg -1 and 350 mAhg -1 , respectively. and the capacity retention rates were 95.8% and 98.1%, respectively. DENE promoted the formation of a thin and uniform SEI layer and improved the stability of the electrode. The addition of DENE effectively improved the electrochemical performance of graphite anodes.
研究领域:
电化学
·
材料科学
·
能源存储
·
电池技术
·
表面化学
✓ 已验证
DOI
高影响因子
Nano Research
·
2021
·Vol. 15
·期 4
·3170-3177
·
IF 8.897
Song Chunlai,Gong Zongshuai,Bai Chong,Cai Fengshi,Yuan Zhihao,Liu Xizheng
Large scale applications of metal-iodine batteries working at sub-zero degree have been challenged by the limited capacity and performance degradation. Herein, we firstly propose a Zn-I 2 battery working at low temperature with a carbon composite material/iodine (CCM-I 2 ) cathode, a Zn anode and an environmentally tolerable Zn(ClO 4 ) 2 -ACN electrolyte. The CCM framework with hierarchical porous structure endows a powerful iodine-anchoring to overcome undesirable dissolution of iodine in organic electrolyte, and the Zn(ClO 4 ) 2 -ACN electrolyte with low freezing point and high ionic conductivity enhances the low temperature performance. The synergies enable an efficiently reversible conversion of Zn-I 2 battery even at −40 ° C. Therefore, the resultant Zn-I 2 battery delivers a high specific capacity of 200 mAh·g −1 , which is fairly approximate to the theoretical capacity of l 2 (211 mAh·g −1 ) and a superior cycling stability with minimal capacity fading of 0.00043% per cycle over 7,000 times under 2C at −20 ° C. Furthermore, even at −40 ° C, this Zn-I 2 battery still exhibits a good capacity retention of 68.7% compared to the capacity at 25 °C and a rapid capacity-recover ability with elevating temperature change. Our results distinctly indicate this Zn-I 2 battery can be competent for the practical application under low temperature operation.
研究领域:
电化学
·
能源材料
·
无机化学
·
储能技术
·
功能材料
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2025
·
IF 1.6
Shajie Luo,Jun Zhou,Jiale Wang,Yuan Wang,Junyu Dai,Yu Xiao,Yu Fan,Meilian Zhao
The novel poly (arylene ether nitrile) copolymers P-HAD and P-PAD containing pendant aliphatic ring and -CF3 group were synthesized by 4, 4′-cyclohexane-1, 1′-diyldiphenol (CHDP) or 4, 4′-cyclopentane-1, 1′-diyldiphenol (CPDP), 4, 4′-(hexafluoroisopropylidene) diphenol and 2, 6-dichlorobenzonitrile (DCBN) through nucleophilic polycondensation using NMP as the solvent in the work. The copolymers owned the inherent viscosities of 0.269-0.868 dL g-1. They exhibited good thermal property, the glass transition temperatures (Tg) were 169.3-173.2°C, the weight-loss temperatures (T5%) were 464.2-470.2°C, and the heat resistance indexs (HRI) were 238.6-248.6°C. The copolymers’ films had good tensile strengths of 62.9-75.1 MPa. Because of the introduction of -CF3 unit, the solubility, dielectric property and optical property were improved well. The copolymers could be dissolved in some solutions at room temperature, such as NMP, DMF, CH2Cl2 and CHCl3, they can be processed by solution method. They had good dielectric property, the dielectric constants were 4.3-4.6 at about 1000 KHz. Additionally, the optical transmittance of these two copolymers were 75.2-76.3% at 450 nm, which have potential to be applied as the heat-resistant optical films in the 5G area or electronic field.
研究领域:
高分子科学
·
材料工程
·
电气工程
·
光学材料
✓ 已验证
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 6
·1470
·
IF 3.623
Lifei Wei,Rui Wang,Zhiguo Zhu,Wenqing Wang,Hanguang Wu
Significant improvement in the fire resistance of polyethylene terephthalate (PET) while ensuring its mechanical properties is a tremendous challenge. A novel flame retardant (GO-HCCP, graphene oxide-hexachlorocyclotriphosphazene) was synthesized by nucleophilic substitution of the graphene oxide (GO) and hexachlorocyclotriphosphazene (HCCP) and then applied in PET by an in situ polymerization technique. The scanning electron microscope (SEM) showed a better dispersion of GO-HCCP than GO in the PET matrix. The char yield at 700 °C increased by 32.5% with the addition of GO-HCCP. Moreover, the peak heat release rate (pHRR), peak smoke produce rate (pSPR)and carbon monoxide production (COP)values significantly decreased by 26.0%, 16.7% and 37.5%, respectively, which indicates the outstanding fire and smoke suppression of GO-HCCP. In addition, the composites exhibited higher elastic modulus and tensile strength without compromising the toughness of PET matrix. These significantly reduced fire hazards properties are mainly attributed to the catalytic carbonation of HCCP and the barrier effect of GO. Thus, PET composites with good flame-retardant and mechanical properties were prepared, which provides a new strategy for further flame retardant PET preparation.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）