JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 15
·11062-11077
·
IF 2.993
Xue Mingzhe,Chen Chen,Tan Yan,Ren Zhiwei,Li Bing,Zhang Cunman
Porous carbon with various structures from micropores (< 2 nm) to hierarchical pores (0–4 nm) was synthesized from biomass waste mangosteen peels via KOH activation process. Microporous carbon was obtained mainly at a low activation temperature of 700 °C or a low alkali/carbon of 3. Hierarchical porous carbon with ultrahigh surface area (> 3000 m 2 g −1 ) and pore volume (> 1.4 cm 3 g −1 ) was obtained at alkali/carbon ratio higher than 3.5 and activation temperature of 800 °C. Sulfur with a high content of 65 wt% was able to be fully accommodated into the pores of hierarchical porous carbon to form C/S composite cathode for lithium sulfur battery while in the case of microporous carbon, residual sulfur on carbon surface was detected. High specific discharge capacities of more than 800 mAh g −1 were achieved from hierarchical porous carbon/S composites at 0.5 C, and the sample synthesized at alkali/carbon of 4 and activation of 800 °C exhibits the best cycling performance. After 500 cycles at 0.5 C, a high discharge capacity of 509 mAh g −1 was maintained, indicating an excellent capacity retention. Relationship between pore characteristics of porous carbon and the electrochemical performance of its sulfur composite was discussed.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 21
·12049-12057
·
IF 4.4
Zhang Ming,Zhao Fengqi,Jiang Yifan,Li Na,Li Hui,An Ting,Qin Zhao,Jiang Zhoufeng
Various graphene-salen iron nanocomplex S-551-Fe, S-602-Fe, S-902-Fe, S-590-Fe, S-792-Fe and S-550-Fe were successfully synthesized using different coupling agents. The microstructure, composition and structure of the prepared graphene-salen iron nanocomplex were characterized by SEM, EDS, FTIR, XPS and RAMAN routes. The results showed the successful fabrication of graphene-salen iron nanocomplex and their two-dimensional structure. In addition, the catalytic property of the graphene-salen iron nanocomplex on the pyrolysis property of TKX-50 was investigated via DSC method, and the kinetic data was calculated by linear and nonlinear models. The positive effects of the synthesized graphene-salen iron nanocomplex for TKX-50 pyrolysis were confirmed, and the impact on the second pyrolysis procedure of TKX-50 is more significant. Among the nanocomplex considered, the S-551-Fe has better catalytic property for TKX-50 pyrolysis, and the activation energy ( E a ) of TKX-50 decreased from 163.50 to 135.55 kJ·mol −1 in the conversion degree of 0.2 ~ 0.8. In addition, the catalytic mechanism of preferred S-551-Fe for TKX-50 pyrolysis was disclosed via in situ FTIR and gas phase MS methods. This study is helpful to the precise design of graphene iron coordination catalysts and the disclosure of their catalytic mechanism for TKX-50 pyrolysis.
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Science China-Materials
·
2021
·Vol. 64
·期 7
·1598-1608
·
IF 8.273
Hu Jiahui,Tang Wu,Liu Sihong,Hu Yang,Yan Yichao,Lai Huanhuan,Xu Liang,Fan Cong
A new organic cathode namely potassium 2,6-dihydroxyanthraquinone (AQ26OK, theoretical capacity ( C T ) = 169 mA h g −1 ) is synthesized and fully characterized for K-ion batteries. AQ26OK is called polyanionic organic cathode because it has a polyanionic organic skeleton (−2 valent) and two strong ionic K-O bonds. Consequently, the polyanionic AQ26OK is hardly soluble into most organic liquid electrolytes. In half cells (0.3–3.4 V vs. K + /K) using 1 mol L −1 KPF 6 in dimethoxyethane, AQ26OK delivers a highly stable specific capacity of 201 mA h g −1 @50 mA g −1 over 450 cycles (4-month test) and realizes ~106 mA h g −1 for 3200 cycles at 500 mA g −1 . Using the reduced state (K 4 TP) of potassium terephthalate (K 2 TP) as the organic anode, the resulting K 4 TP II AQ26OK organic potassium ion batteries can display a highly stable average discharge capacity of 135 mA h g −1 cathode over 250 cycles at 100 mA g −1 and ~47 mA h g −1 for 1000 cycles at 500 mA g −1 during the working voltage of 0.01–3.1 V. To the best of our knowledge, AQ26OK is among the best stable cathodes reported for K ion batteries.
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Frontiers of Environmental Science & Engineering
·
2019
·Vol. 13
·期 6
·1-11
·
IF 3.883
Guo Xiaoyan,Li Chunyu,Li Chenghao,Wei Tingting,Tong Lin,Shao Huaiqi,Zhou Qixing,Wang Lan,Liao Yuan
Although carbon nanomaterials have been widely used as effective nanofillers for fabrication of mixed matrix membranes (MMMs) with outstanding performances, the reproducibility of the fabricated MMMs is still hindered by the non-homogenous dispersion of these carbon nanofillers in membrane substrate. Herein, we report an effective way to improve the compatibility of carbon-based nanomaterials with membrane matrixes. By chemically conjugating the oxidized CNTs (o-CNTs) and GO using hexanediamine as cross-linker, a novel carbon nanohybrid material (G-CNTs) was synthesized, which inherited both the advanced properties of multi-walled carbon nanotubes (CNTs) and graphene oxide (GO). The G-CNTs incorporated polyvinylidene fluoride (PVDF) MMMs (GCNTs/PVDF) were fabricated via a non-solvent induced phase separation (NIPS) method. The filtration and antifouling performances of G-CNTs/PVDF were evaluated using distillate water and a 1 g/L bovine serum albumin (BSA) aqueous solution under 0.10 MPa. Compared to the MMMs prepared with o-CNTs, GO, the physical mixture of o-CNTs and GO and pure PVDF membrane, the G-CNTs/PVDF membrane exhibited the highest water flux up to 220 L/m 2 /h and a flux recovery ratio as high as 90%, as well as the best BSA rejection rate. The excellent performances should be attributed to the increased membrane pore size, porosity and hydrophilicity of the resulted membrane. The successful synthesis of the novel nanohybrid G-CNTs provides a new type of nanofillers for MMMs fabrication.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 15
·12638-12648
·
IF 2.22
Zhou Xiaohong,Chen Yongyang,Wang Peiying,Xu Chengyang,Yan Qishe
The AgI/BiPO 4 n–n heterojunction hybrids were favorably fabricated over amorphous particles AgI closely in contact with petty polyhedron-assembled star-like BiPO 4 by precipitation technology for the first time. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–Vis diffuse reflectance spectra (DRS), electrochemical test, etc. The degradation of tetracycline hydrochloride (TC) and methylene blue (MB) was employed to testify the performance of as-prepared composites upon exposure of simulated solar light and the AB-X composites exhibited boosted degradation efficiency in comparison with the as-prepared pure BiPO 4 and AgI. For instance, the calculated k TC of pseudo-first-order kinetics model on 24 wt% AgI/BiPO 4 sample was 36 times relative to those on pure BiPO 4 . This enhanced activity might due to increased charge transfer and separation efficiency in the formed n–n heterojunction and the dominant reaction active species were authenticated by trapping experiments. Furthermore, the internal electric field in the AgI/BiPO 4 heterojunction and the transfer path of electron–holes were tentatively deduced through graphical elucidation.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 7
·3642-3656
·
IF 2.302
Long Lu,Yao Yadong,Yan Minglei,Wang Hongjing,Zhang Guanggao,Kong Menglai,Yang Lin,Liao Xiaoming,Yin Guangfu,Huang Zhongbing
Ni 3 S 2 @polypyrrole/nickel foam (Ni 3 S 2 @PPy/NF) composite was successfully synthesized by combining a facile hydrothermal synthesis and a simple electrochemical-deposited process. For comparative study, the honeycomb-shaped Ni 3 S 2 had in situ been grown on NF without the addition of any nickel salt to obtain the Ni 3 S 2 /NF composite. The electrochemical measurement results show that the area capacitance of the Ni 3 S 2 @PPy/NF electrode is 1.13 F cm −2 that is slightly lower than 1.26 F cm −2 of the Ni 3 S 2 /NF electrode at a high current density of 30 mA cm −2 , yet its rate capability and cycling stability are far better than those of the Ni 3 S 2 /NF electrode. Meanwhile, an asymmetric supercapacitor on the basis of the Ni 3 S 2 @PPy/NF anode and the AC cathode exhibits a high energy density and power density of 17.54 Wh kg −1 and 179.33 W kg −1 at 2.5 mA cm −2 , respectively; besides, the energy density is still 8.67 Wh kg −1 at a power density of 3587.41 W kg −1 even at 50 mA cm −2 . Moreover, the capacitances of the device remain unchanged after 3000 galvanostatic charge/discharge cycles at a high current density of 30 mA cm −2 . Furthermore, two such 1 cm 2 devices connected in series can light five 40-mW LED indicators or power one of the same-power LED indicator for 20 min after being fully charged. The results demonstrate that our asymmetric supercapacitor has a promising potential in commercial applications.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 5
·3267-3279
·
IF 2.599
Duan Haojie,Wang Yifang,Li Shuo,Li Haiying,Liu Li,Du Liting,Cheng Yali
Pure and Ho-doped In 2 O 3 nanotubes (NTs) and porous nanotubes (PNTs) were successfully synthesized by conventional electrospinning process and the following calcination at different temperatures. X-ray diffractometry (XRD), thermogravimetric analysis (TGA), Raman spectrometer, energy-dispersive spectroscopy, scanning and transmission electron microscopy were carefully used to investigate the morphologies, structures and chemical compositions of these samples. Their sensing properties toward ethanol gas were studied. Compared with pure In 2 O 3 NTs (response value is 17), pure In 2 O 3 PNTs (response value is 20) demonstrated enhanced sensing characteristics. What’s more, the response of Ho-doped In 2 O 3 PNTs sensors to 100 ppm ethanol was up to 60 at 240 °C, which increased three times more than that of the pure In 2 O 3 PNTs. Additionally, the minimum concentration for ethanol was 200 ppb (response value is 2). The increased gas-sensing ability was attributed not only to the hollow and porous structure, but to the Ho dopant. Furthermore, Ho-doped In 2 O 3 PNTs enable sensor to discriminate between ethanol and the other gas distinctly, particularly acetone that is usually indistinguishable from ethanol. Also, by analyzing XRD, TGA and Raman spectrometer, a possible formation mechanism of porous nanotubes and sensing mechanism were put forward.
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2020
·Vol. 29
·期 11
·7239-7249
·
IF 1.652
Sang Changcheng,Cai Xiaoping,Zhu Lu,Ren Xuanru,Niu Gao,Wang Xiaohong,Feng Peizhong
To achieve the low energy consumption and high strength joining between Ti and Ni, a novel joining method (rapid thermal explosion, TE) was developed for joining dissimilar metals using Ti-Al mixture powders as flux. The TE reaction temperature of Ti-Al flux was measured, and the microstructure and mechanical properties of Ti/Ni joint were investigated. The results reveal that the combustion temperature of the Ti-Al powder interlayer is 1103 °C, which is higher than the joining temperature, and an obvious self-exothermic phenomenon lasts 20 s. The intermetallic compound diffusion layers formed at both interfaces mainly owing to the diffusion of Al and the growth activation energy of diffusion layers near both interfaces are 79.68 kJ/mol and 38.26 kJ/mol, respectively. Based on the sheer strength and diffusion layer, the formation mechanism of Ti/Ni joints is metallurgical bonding through atomic diffusion and formation of the diffusion layer.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 6
·3110-3123
·
IF 2.302
Li Jingang,Wu Zheyi,Sun Xiaoyu,Zhang Xianwen,Dai Rucheng,Zuo Jian,Zhao Zhi
In this paper, Eu 3+ -doped yttrium tungstate (Y 2 WO 6 ) nanophosphors with different morphologies have been synthesized by a hydrothermal method with the assistance of cetyltrimethyl ammonium bromide. X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and photoluminescence spectroscopy (PL) were used to characterize the products. The pH value of the starting solution plays a crucial role in the structures and morphologies of the samples. When the precursors synthesized under alkaline condition are annealed at 1100 °C in the air, the pure monoclinic Y 2 WO 6 phase can be obtained. The results of HRTEM and SAED are consistent with those of the XRD patterns, confirming the high crystallinity of the products. A detailed study of the optical properties, including the UV–Vis diffuse reflection spectra, the excitation and emission spectra, CIE coordinate, and color purity of Y 2 WO 6 :Eu 3+ nanophosphors with different doping concentrations, are presented here. The critical distance R
c and energy transfer mechanism for the concentration quenching of Eu 3+ ions are discussed in detail. In addition, the decay time and the thermal stability of the samples have been also investigated elaborately. The PL properties of the as-synthesized materials indicate promising applications in UV-pumped red light-emitting diodes.
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Science China-Materials
·
2023
·Vol. 66
·期 5
·1989-1996
·
IF 8.1
Yang Zhiyu,Zhao Yifei,Ueda Jumpei,Molokeev Maxim S.,Shang Mengmeng,Xia Zhiguo
Blue-light-excitable red-emitting phosphors with high thermal stability are essential for fabricating white light-emitting diodes (WLEDs). Herein, Ce 3+ -doped SrLaScO 4 (SLO:Ce 3+ ) phosphor is discovered to have an abnormal red emission band centered at 640 nm when excited at 440 nm. Spectroscopy and structural analyses confirm that Ce 3+ ions occupy the [LaO 8 ] polyhedrons competitively, generating a strong crystal field splitting and a large Stokes shift to produce a red emission. To further restrict the thermal quenching of SLO:Ce 3+ , charge-transfer engineering is implemented by incorporating a large electronegative Ga 3+ in the Sc 3+ site, which can attract more charges from nearby coordinating groups to decrease the electronic occupation at the bottom of the conduction band and thereby enlarge the band gap. Sc/Ga substitution in SrLa(Sc,Ga)O4:Ce 3+ enhances the thermal stability by increasing the intensity ratio from 15% to 31% at 150°C compared with 20°C. This is attributed to the efficient suppression of the thermally stimulated ionization process. This study presents a general design principle for discovering novel Ce 3+ -doped red phosphors with good thermal stability for WLED applications.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 13
·6097-6106
·
IF 4.4
Nie Sheng,Zhong Jin-Rong,Li Yan,Zhang Yue-Fei
A series of polyacrylic salts are used as nucleating agents in isotactic polypropylene (iPP). Investigations are done on the mechanical characteristics, crystallization behavior, and melting behavior of nucleated iPP. According to the result from differential scanning calorimetry (DSC), the temperature at which nucleated iPP crystallize was 3–5 °C higher than the temperature at which pure iPP. Meanwhile, zinc polyacrylate, potassium polyacrylate, and sodium polyacrylate have the ability to induce β-crystals in iPP, according to wide-angle X-ray diffraction data. The optical microscope observation combined with DSC results shows that potassium polyacrylate had a β-nucleation effect when it had a lamellar crystal structure. When compared to pure iPP, the impact strength of iPP nucleated with sodium polyacrylate or potassium polyacrylate is improved by 23.48% and 24.35%, respectively. According to the mechanical properties results, there is no significant change in the tensile strength and flexural modulus of nucleated iPP with sodium polyacrylate and potassium polyacrylate. Without compromising its stiffness, sodium polyacrylate or potassium polyacrylate can increase the toughness of nucleated iPP.
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CHINESE SCIENCE BULLETIN
·
2007
·Vol. 52
·期 2
·194-199
·
IF 0.722
Wu Hua,Zeng XiangQiong,Lu LingBo,Ren TianHui
Two di-n-butyl dithiocarbamate derivatives were easily synthesized. Their tribological performances as lubricating oil additives in rapeseed oil were evaluated using a four-ball machine, and their chemistry of films was analyzed with X-ray absorption near-edge spectroscopy (XANES). The results indicate that the two compounds possess excellent anti-wear property and good load-carrying capacity. According to the XANES results, for the thermal films, the outer surfaces are mainly composed of N, S-containing polymer and ferric sulfate, and the near-surface and the bulk are composed of ferrous sulfate, while for the anti-wear films, the outer surfaces are only composed of ferric sulfate, but the near-surface and the bulk are mainly composed of ferrous sulfate.
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危险品化学品经营许可证（带存储）