JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2024
·Vol. 32
·期 7
·3142-3158
·
IF 4.7
Mo Yanping,Cheng Zhiru,Xie Yuhui,Chu Junhan,Xie Shuangyu,Meng Yang,Wu Feng,Feng Dong,Mei Yi,Xie Delong
Flexible polyurethane foam (FPUF) has a widespread application across aerospace, furniture and vehicles, while its flammability always arouses severe safety concerns. Herein, a novel, bio-based flame retardant, i.e. polyol (PADEA) that contains phosphorus and nitrogen elements, was successfully synthesized by using phytic acid (a bio-organic acid) and diethanolamine as crude materials. Then, PADEA partially substituted the commercial polyether polyols in the foaming process, during which PADEA reacted in situ with isocyanate to construct an inherently flame-retardant FPUF. Due to the purposive designed P-N synergistic molecular structure, PADEA can serve as a highly efficient intumescent flame-retardant (IFR) system. When 40 php (ca. 21.51wt%) PADEA was added into the system, the limiting oxygen index (LOI) of the obtained FPUF reached up to 24.1%, achieving a 22.0% increase compared to that of primitive FPUF without PADEA. Moreover, the addition of PADEA can considerably reduce the total number of melt drips in the UL-94 HB rating test. And the cone calorimeter (CC) results demonstrated a 47.08% reduction in total heat release (THR) was achieved as 40 php PADEA was added. At the end, various characterization methods were carried out, revealing the flame-retardant mechanism of PADEA both in condense and gaseous phase. This work highlights a facile and green strategy for designing functional polyol to address the flame-retardant issues of high-performance FPUF. Graphical
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高影响因子
IONICS
·
2023
·Vol. 30
·期 3
·1677-1690
·
IF 2.8
Ye Jiankang,Fu Qingshan,Ye Ang,Xu Changkangle,Zhou Feiyu,Chen Xuedan,Zhu Wenli,Chen Jian
Continuous efforts are always being made to reinforce biochars’ properties for large-scale utilization in new energy devices. Here, a pre-burning treatment is introduced for preparing the biochars from shaddock peel, longan pericarp, and loofah sponge. The results of XRD demonstrate more disordered structures are caused in the prepared biochars by the pre-burning, which also introduces more oxygen-containing functional groups on the biochars’ surface discovered by the FTIR and XPS tests. The N 2 adsorption–desorption results indicate that the pre-burning can facilitate pore formation in the biochars, boosting specific surface area and pore volume, significantly reducing the average pore size of biochars. Specifically, for the loofah sponge based biochar, the pre-burning treatment causes an increase in specific surface area (from 271 to 973 m 2 g −1 ), a rise in pore volume (from 0.22 to 0.53 cm 3 g −1 ), and a decrease in average pore diameter (from 3.21 to 2.3 nm). The specific capacitance of the supercapacitor with the loofah sponge based biochar electrodes is raised from 85.4 to 170 F g −1 at 0.5 A g −1 by the pre-burning treatment. Besides, the longan pericarp-derived biochar with the pre-burning treatment achieves a power density of 5000 W kg −1 under an energy density of 21.81 Wh kg −1 . We believe the pre-burning treatment is an effective and convenient route for the reinforcement of biochars.
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高影响因子
RARE METALS
·
2022
·Vol. 42
·期 1
·146-154
·
IF 6.318
Wu Yun-Feng,Ma Ji-Wei,Huang Yun-Hui
Designing highly active and durable electrocatalysts towards oxygen reduction reaction (ORR) plays a paramount importance for proton exchange membrane fuel cells. Pt-based binary alloys Pt-M (M = 3d-transition metals) possessing excellent electronic and geometric properties have received increasing interests as highly active electrocatalysts. Herein, we report a series of Pt x Co/C ( x = 1, 2, 3) catalysts by a facile one-pot soft-chemistry method. In the acidic conditions, the mass activities of PtCo/C, Pt 2 Co/C and Pt 3 Co/C are 0.526, 0.462 and 0.441 A·mg Pt −1 , which are 2.60, 2.31 and 2.22 times higher than that of Pt/C (0.200 A·mg Pt −1 ), respectively. The specific activities of PtCo/C, Pt 2 Co/C and Pt 3 Co/C are 706.59, 679.41 and 801.83 μA·cm −2 , which are accordingly 2.89, 2.76 and 3.28 times higher than that of Pt/C (244.75 μA·cm −2 ). Notably, Pt 3 Co/C shows a remarkable durability. After 5000 cycles of the accelerated durability testing, the mass activity and specific activity of Pt 3 Co/C catalyst are 2.47 and 3.80 times higher than that of the commercial Pt/C, respectively. The improved ORR activity and durability can be ascribed to the synergistic interaction between Pt and Co. Graphical
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高影响因子
IONICS
·
2020
·Vol. 26
·期 10
·4825-4833
·
IF 2.394
Liu Jiuqing,Xi Yang,Li Qihou,Li Jie,Liu Meng,Wang Cheng,Hong Zikun,Song Feifei,Bai Lishun,Zeng Fanli
The high performance and safety of lithium-sulfur (Li-S) batteries are the focus of research in recent years. The separator is an important part of the battery, whose performance stability directly affects the performance of the battery. What’s more, there are still many defects in the commercial polyolefin separator. In this work, a polyethylene/polyetherimide (PE/PEI) composite separator is designed by surface coating and non-solvent-induced phase separation (NIPS) method. The film breakage temperature and anti-puncture strength of the PE/PEI composite separator (181.96 °C, 7.90 N) are higher than those of the commercial PE separator (153.00 °C, 6.20 N), which will greatly ensure the safety problems caused by internal self-heating and external short circuit of Li-S batteries. The PE/PEI composite separator–based Li-S battery delivers a high initial specific capacity of 1265 mAh g −1 at 0.2 C and exhibits excellent rate capability compared with the commercial PE separator. Therefore, the PE/PEI composite separator is a candidate separator for the high-performance and high-safety Li-S battery.
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高影响因子
IONICS
·
2021
·Vol. 27
·期 9
·3943-3950
·
IF 2.817
Cai Xinhao,Li Hanghang,Li Jing,Yan Huihui,Liu Yiwen,Yu Haoxiang,Yan Lei,Zhang Liyuan,Shu Jie
Rechargeable aqueous Zn/MnO 2 battery with mild electrolyte is exceedingly suitable for massive electrochemical applications due to its eco-friendliness and high safety. However, cycle stability is a crucial question in the practical application. Besides, the mechanism involved in energy storage is still controversial. Here, we show a Zn/MnO 2 battery with excellent cycle stability and provide the reasonable explanation of the operating mechanism. In this battery, the mild aqueous ZnSO 4 solution containing MnSO 4 and Na 2 SO 4 additives serves as the electrolyte and the β-MnO 2 nanorods serve as the cathode. As presented in the electrochemical tests, the specific capacity of β-MnO 2 nanorods is as high as 323.5 mA h g −1 , and its capacity retention is 94% after 1000 cycles at 3 A g −1 . The proposed energy storage mechanism is related to the reversible conversion reaction between β-MnO 2 and MnOOH. Therefore, the application of β-MnO 2 nanorods in aqueous Zn-ion battery has broad development prospects. Graphical abstract
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高影响因子
Science China-Materials
·
2020
·Vol. 64
·期 3
·557-570
·
IF 6.098
Li Yanwei,Ji Jingcheng,Yao Jinhuan,Zhang Ying,Huang Bin,Cao Guozhong
A fundamental understanding of the electrochemical reaction process and mechanism of electrodes is very crucial for developing high-performance electrode materials. In this study, we report the sodium ion storage behavior and mechanism of orthorhombic V 2 O 5 single-crystalline nanowires in the voltage window of 1.0–4.0 V (vs. Na/Na + ). The single-crystalline nanowires exhibit a large irreversible capacity loss during the first discharge/charge cycle, and then show excellent cycling stability in the following cycles. At a current density of 100 mA g −1 , the nanowires electrode delivers initial discharge/charge capacity of 217/88 mA h g −1 , corresponding to a Coulombic efficiency of only 40.5%; after 100 cycles, the electrode remains a reversible discharge capacity of 78 mA h g −1 with a fading rate of only 0.09% per cycle compared with the 2 nd cycle discharge capacity. The sodium ion storage mechanism was investigated, illustrating that the large irreversible capacity loss in the first cycle can be attributed to the initially formed single-crystalline α′-Na x V 2 O 5 (0.02 < x < 0.88), in which sodium ions cannot be electrochemically extracted and the α′-Na 0.88 V 2 O 5 can reversibly host and release sodium ions via a single-phase (solid solution) reaction, leading to excellent cycling stability. The Na+ diffusion coefficient in α′-Na x V 2 O 5 ranges from 10 −12 to 10 −11.5 cm 2 s −1 as evaluated by galvanostatic intermittent titration technique (GITT).
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高影响因子
Arabian Journal of Geosciences
·
2022
·Vol. 15
·期 8
·1-21
·
IF 0
Oinam Moni,Rajkumar Hemanta Singh,Soibam Ibotombi,Oinam Nishila,Heni Echeni
The Oligocene Barail Group represents a significant lithostratigraphic unit within Paleogene-Neogene successions of northeast India. Integrated sedimentologic and ichnologic analyses along the Old Cachar road, Manipur, have been carried out. Sedimentological investigation reveals a dominance of subarkoses and arkoses, with source rocks being granites, pegmatites, gneiss, and schists, typical of a warm, humid to subhumid palaeoclimate. The ichnofauna points to a depositional environment ranging from upper shoreface through tide-dominated delta front up to the lower shoreface zone, characterized by Teredolites , Glossifungites , Skolithos , Skolithos-Cruziana , and Cruziana ichnofacies. The Barail sequences represent a hyperpycnal-delta-fed sedimentary unit, deposited at the continental margin in the passively rifted western Burma basin which evolved due to magma-poor hyperextension.
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DOI
IONICS
·
2017
·Vol. 24
·期 9
·2583-2590
·
IF 2.062
Wang Xiaoqing,Yin Mingyue,Xue Huidong,Su Yu,Tian Songran
Niobium-doped MnO 2 /reduced graphene oxide (Nb-MnO 2 /RGO) composite has been successfully synthesized via a simple microwave radiation method. The samples were systematically studied by X-ray diffraction (XRD), thermogravimetric analysis (TG), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), transmission electron microscope (TEM), and electrochemical measurements. As the anode material for lithium-ion batteries, the Nb-MnO 2 /RGO (molar ratio of Mn/Nb = 50:1) (NMG50) showed an outstanding reversible discharge capacity of 556.6 mAh g −1 after 50 cycles with a capacity retention of 77% at a charge-discharge rate of 0.1 A g −1 and the reversible discharge capacity can still retain 223.3 mAh g −1 at a current of 1 A g −1 , which is much higher than those for Nb-MnO 2 /RGO (molar ratio of Mn/Nb = 10:1) (NMG10) and undoped MnO 2 /RGO (MG). The improved electrochemical performance could be attributed to the proper amount of Nb doping, which could enhance both the conductivity and the structure stability of MnO 2 .
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2014
·Vol. 33
·期 1
·184-191
·
IF 1.42
Sun Shiyuan,Dong Luhua,Song Depeng,Huang Binlei,Hu Aiguo
Several new enediynes with long chain alkyl groups were synthesized through Sonogashira coupling reactions between long chain alkynes and (Z)-1,2-dichloroethene. These enediynes (1) were then subjected to thermal Bergman cyclization in a refluxing diphenyl ether bath under vacuum to obtain conjugated polyphenylenes with the weight-average molecular weights up to 4.9 × 10 3 g·mol −1 . The occurrence of Bergman cyclization was confirmed by 1 H-NMR, 13 C-NMR, and IR spectroscopic analysis. These polyphenylenes are fully soluble in common organic solvents and exhibit good thermal stability. The optical properties of the polyphenylenes were investigated by UV-Vis absorption and photoluminescence (PL) spectroscopies. A blue emission was observed for all these polyphenylenes.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 1
·97-104
·
IF 1.063
Gao Yuan,Zhou Ruitao,Wang Dongrui,Huang Qiyao,Cheng Ching-Hsiang,Zheng Zijian
Flexible asymmetric supercapacitor is fabricated with three dimensional(3D) Fe 2 O 3 /Ni(OH) 2 composite brush anode and Ni(OH) 2 /MoO 2 honeycomb cathode. Particularly for 3D composite brush anode, a layer of thin Fe 2 O 3 film is firmly adhered on a 3D Ni brush current collector with the assist of Ni(OH) 2 , functioning as both adherence layer and pseudocapacitive active material. The unique 3D Ni brush current collector possesses large surface area and stretching architecture, which facilitate to achieve the composite anode with high gravimetric capacitance of 2158 F/g. In terms of cathode, Ni(OH) 2 and MoO 2 have a synergistic effect to improve the specific capacitance, and the resulting Ni(OH) 2 /MoO 2 honeycomb cathode shows a very high gravimetric capacitance up to 3264 F/g. The asymmetric supercapacitor(ASC) has balanced cathode and anode, and exhibits an ultrahigh gravimetric capacitance of 1427 F/g and an energy density of 476 Wh/kg. The energy density of ASC is 3–4 times higher than those of other reported aqueous electrolyte-based supercapacitors and even comparable to that of commercial lithium ion batteries. The device also shows marginal capacitance degradation after 1000 cycles’ bending test, demonstrating its potency in the application of flexible energy storage devices.
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高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2015
·Vol. 124
·期 1
·471-478
·
IF 2.042
Lu Gui-bin,Yang Ting,Chen Li-ping,Zhou Yi-shan,Chen Wang-hua
2-Ethylhexyl nitrate (EHN) is an important nitro compound for chemical industry. However, EHN is an unstable material and frequently causes fire and explosion accidents. Therefore, it is necessary to understand the mechanism of its thermal decomposition. In this paper, EHN was investigated by differential scanning calorimeter under non-isothermal and isothermal conditions, and its thermal decomposition kinetics was calculated with Friedman method. A model for the decomposition reaction was established by Malek method and verified by an isothermal method. The results indicated that the values of activation energy ( E ) for EHN were (154 ± 3) kJ mol −1 under non-isothermal and (157 ± 7) kJ mol −1 under isothermal conditions. In addition, there was almost no difference in E at various extent of the reactant conversion, suggesting that a single-step reaction model is suitable to describe the decomposition reaction. In addition, the temperature of no return ( T
NR ) and self-accelerating decomposition temperature were calculated under non-isothermal and isothermal conditions. Using Malek method, the decomposition model obtained is Avrami–Erofeev equation ( n = 4/3). This model was verified by G ( α ), based on the results of isothermal experiment. The kinetic parameters under the isothermal conditions were in good agreement with those obtained under the non-isothermal conditions.
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高影响因子
Nano Research
·
2019
·Vol. 12
·期 12
·3129-3134
·
IF 8.515
Yang Hewei,Feng Yaqing,Tu Zhiyu,Su Kuo,Fan Xiaozhi,Liu Bingjie,Shi Zhiping,Zhang Yuzhe,Zhao Chenyang,Zhang Bao
Blue emitting perovskite ink obtained from cesium lead halide quantum dots bearing chlorine (CsPbCl x Br 3− x , 0 < x ≤ 3) suffers from the low photoluminescence quantum yield and poor stability. Cesium lead bromine (CsPbBr 3 ) quantum dots free of chlorine have more stable crystal structure and fewer crystal defects. Precise control of crystal sizes and surface passivation components of CsPbBr 3 quantum dots is crucial for the best use of quantum confinement effect and blueshift of emission wavelength to blue region. Here, by polymerizing acrylamide under UV-light irradiation to form polymer gel networks in dimethyl sulfoxide (DMSO) with CsPbBr 3 precursors and passivating agents trapped, we successfully prepared novel sustained release tablets with different shapes and sizes. Thanks to the limitation of the polymer networks on solvent releasing, the resulting CsPbBr 3 quantum dots have the average size of 1.1 ± 0.2 nm. On the basis of the excellent quantum confinement effect and optimized surface passivation, the obtained PQD ink can emit high quality blue light for more than 6 weeks. This work elucidates a new and convenient technique to prepare blue emission perovskite quantum dots ink with high stability and photoluminescence quantum yield and provides a great potential technology for the preparation of perovskite optoelectronic devices.
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高影响因子
危险品化学品经营许可证（带存储）