RARE METALS
·
2020
·Vol. 39
·期 9
·1099-1106
·
IF 2.161
Han Xu-Ran,Guo Xiao-Tian,Xu Meng-Jiao,Pang Huan,Ma Yan-Wen
Lithium–sulfur batteries (LSBs) have received much concern as emerging high-power energy storage system. Nevertheless, the low conductivity of sulfur and polysulfide shuttle results in low rate capability and rapid capacity decay, which seriously limit its commercial application. Here, facile, sustainable and cost-effective strategy for preparing heteroatom-doped porous activated carbon (PAC) derived from biomass palm kernel shell (PKS) was developed for high-performance LSB applications. The presence of N, P and S heteroatoms with modification of the surface polarity brings about large amounts of active sites and improved adsorption property compared to those of common carbon materials. The PAC sample possesses desirable specific surface area (SSA) (2760 m 2 ·g −1 ) as well as pore volume (1.6 cm 3 ·g −1 ). Besides, the good electrical conductivity of PAC endows the material with excellent rate performance. The PAC-S electrode with a 60% of sulfur loading has a desirable first discharge capacity (1045 mAh·g 1 , 200 mA·g −1 ) with superb discharge capacity (869.8 mAh·g −1 , 100th cycle) and cyclability (312.6 mAh·g −1 , 800 mA·g −1 , 1000th cycle), which can be mainly ascribed to its unique porous properties and the good conductivity of PAC. Graphic abstract
研究领域:
能源材料
·
电化学
·
可持续化学
·
电池技术
·
纳米多孔材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 17
·10526-10532
·
IF 2.599
Yang Manman,Su Taichao,Zhou Dawei,Zhu Hongyu,Li Shangsheng,Hu Meihua,Hu Qiang,Ma Hongan,Jia Xiaopeng
Recently, it was found that element semiconductor tellurium (Te) has a high thermoelectric performance. However, it needs to be doped with high-toxic arsenic (As) to tune the carrier concentration of Te. In this paper, low-toxic bismuth (Bi) was employed as dopant to optimize the thermoelectric performance of Te combining with a high-pressure synthesis method. The effect of substituting Bi on the electrical transport and thermal transport properties of Te has been investigated. The results show that the solubility limit of Bi in Te is about 0.1 mol%. However, the trace amounts of Bi doping can tune the carrier concentration of Te effectively and thereby optimize its power factor. The thermal conductivity of non-doped Te prepared by high pressure is much lower than that of the sample prepared at ambient pressure. And Bi doping can further decrease the value due to the phonons scattered by the heavy impurity atom. An enhanced figure of merit ZT ~ 0.72 was obtained at 517 K, which is about four times that of non-doped Te and is comparable to the state-of-the-art thermoelectric alloys with more complex composition such as Bi 2 Te 3 and PbTe.
研究领域:
材料科学
·
热电学
·
固体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 10
·8673-8687
·
IF 2.324
Qin Qingyuan,Shi Qingdan,Sun Wen,Wan Junmin,Hu Zhiwen
The purpose of this research is to design and fabricate a novel ternary hybrid nanostructure heterojunction with high-efficiency visible-light-driven photocatalysis. The porous layered TiO 2 nanotubular structures (TNTs) with high percentage of photocatalytic reactive facets, which were turned into by commercially available TiO 2 , were wrapped on the surface of hydroxylation carbon nanotubes (CNTs) through the formation of Ti–O=C and/or Ti–O–C bond between CNTs and TiO 2 . Then the TNT@CNT nanotubular composites were coated by ultrathin g-C 3 N 4 nanosheets with a thickness of 3–4 nm. The ternary nanocomposites owned strong absorption performance, low charge recombination rates and high-efficiency photocatalytic activities, which were all owe to high surface areas and excellent adsorptivity of the CNTs, photocatalytic performance of TiO 2 nanotubes (TNTs) and moderate band gap of g-C 3 N 4 nanosheet. What’s more, the formation of chemical bonds greatly improved visible-light photocatalytic activity with a degradation rate of 98.2 and 97.9% for methylene blue and rhodamine B in 60 min under visible-light irradiation, which showed ~ 10 times enhancement compared to pure TiO 2 . In addition, the existence of h + and ·OH and ·O 2− radicals played main role in the photocatalytic process. The new material was of great significance to environmental protection and energy criss.
✓ 已验证
DOI
高影响因子
IONICS
·
2019
·Vol. 26
·期 5
·2335-2342
·
IF 2.289
Jiang Huize,Han Yu,Wang Hui,Guo Qingpeng,Zhu Yuhao,Xie Wei,Zheng Chunman,Xie Kai
Li 3 PS 4 (LPS) was in situ formed at the active material Li 2 S through the reaction of Li 2 S and P 2 S 5 by mechanical ball milling, which can be used to composite cathode for Li/S battery. The fine active materials-electrolyte interface will be generated via in situ reaction. Compared with the direct mixing Li 2 S + LPS, the interface impedance between Li 2 S and LPS of Li 2 S-LPS had a significant decrease from 833.3 Ω to 203.7 Ω at room temperature. The effect of heat treatment temperature on the ionic conductivities of Li 2 S-LPS has been studied, and the Li 2 S-LPS-300 showed the highest ionic conductivity of 2.67 × 10 −4 S cm −1 at room temperature. The all-solid-state cell (Li/LPS/Li 2 S-LPS) possessed a larger capacity and better rate performance than that of the cell using Li 2 S + LPS as cathode material, showing a discharge capacity of 624.5 mAh g −1 (g of Li 2 S) for the 20th cycle. We also find that high carbon content of composite cathode will reduce the utilization of Li 2 S. The composite cathode 90Li 2 S-LPS + 10C (wt%) shows the highest capacity of 763.8 mAh g −1 at the current density of 0.1 mA cm −2 .
研究领域:
材料科学
·
电化学
·
储能
✓ 已验证
DOI
高影响因子
IONICS
·
2020
·Vol. 26
·期 10
·5279-5286
·
IF 2.394
Chen Fang,Zhan Linqian,Zhang Songqing,Liang Zhongxin,Fan Xuliang,Ma Lin,Zhou Xiaosong
Lithium-sulfur (Li-S) battery with high energy density is a promising substitute for the conventional lithium-ion battery. However, the application of Li-S battery is limited by the low conductivity of sulfur and the diffusion of soluble intermediate polysulfide. To solve this issue, we have successfully prepared a graphite nanosheet/manganese dioxide (GN/MnO 2 ) composite as the sulfur host material by a one-step electrochemical exfoliation-deposition method. Combined with the high electrical conductivity of GN and the strong interaction between MnO 2 and polysulfide, the derived GN/MnO 2 /S cathode could exhibit superior electrochemical performance and high stability during the charge-discharge process. Even after 250 cycles, the GN/MnO 2 /S composite remained a stable discharge capacity of 493.5 mAh/g with the capacity retention of 68.5%.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米材料
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 4
·803-806
·
IF 1.6
Ma Liang,Hu Yucheng,Zhou Zeyi,Zhu Bo,Zheng Wenjie,Zhang Rui
We reported a low-cost and easy-to-make method to effectively generate quantum dot (QD) states in 2D hBN films for quantum emissions at room temperature by utilizing silica nanospheres, in comparison with the sophisticated nanofabrication method reported in previous studies. The QDs created in 2D hBN films using silica nanospheres exhibit pronounced photon emissions with a good photo-stability in air, a narrow distribution of the emission peaks within the range of 580–620 nm, and a directional emission pattern, behaving as a single electric dipole. Our work develops the method of controllable fabrication of quantum emitters in 2D materials by using nano materials and structures.
研究领域:
量子光学
·
纳米光子学
·
材料科学
·
二维材料
·
应变工程
✓ 已验证
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2016
·Vol. 47
·期 5
·2830-2836
·
IF 1.474
Long Hongming,Wu Xuejian,Chun Tiejun,Di Zhanxia,Yu Bin
In this study, the assimilation behaviors between calcium ferrite (CF), calcium diferrite (CF 2 ) and sintered Al 2 O 3 , and MgO were explored by an improved sessile drop technique, and the interfacial microstructure was discussed. The results indicated that the apparent contact angles of CF slag on Al 2 O 3 and MgO substrate were 15.7 and 5.5 deg, and the apparent contact angles of CF 2 slag on Al 2 O 3 and MgO substrate were 17.9 and 7.2 deg, respectively. Namely, CF and CF 2 slag were wetting well with Al 2 O 3 and MgO substrate. The dissolution of Al 2 O 3 substrate into the CF and CF 2 slag was found to be the driving force of the wetting process. For the CF-MgO and CF 2 -MgO substrate systems, CaO contrarily distributed with MgO after wetting. For the CF-MgO system, after wetting, the slag was composed of CF and C 2 F, and most of the Fe 2 O 3 permeated into substrate and formed two permeating layers.
研究领域:
材料科学
·
冶金学
·
陶瓷学
·
高温化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 10
·8535-8546
·
IF 2.324
Xiao Jia,Diao Kaidi,Zheng Zhou,Cui Xudong
We report a facile strategy to synthesize porous ZnO/Co 3 O 4 composites by direct pyrolysis of the metal–organic frameworks (MOFs) precursor and their applications to the sensing of acetone at ppb–ppm level. The as-prepared ZnO/Co 3 O 4 sample exhibits enhanced sensitivity (15.17 ppm −1 ), high selectivity towards low-concentration acetone when compared with pure ZnO. The enhancement in gas sensing performance of ZnO/Co 3 O 4 sample could be attributed to the unique porous structure, the p -Co 3 O 4 / n -ZnO junctions effect and the catalytic activity of Co 3 O 4 . The studies might open intriguing perspectives for the design of porous p/n composites for high performance gas sensing applications.
研究领域:
材料科学
·
气体传感
·
纳米材料
·
化学传感器
·
无机化学
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2018
·Vol. 61
·期 2
·243-253
·
IF 4.318
Zhou Jinhua,Chen Ningna,Ge You,Zhu Hongli,Feng Xiaomiao,Liu Ruiqing,Ma Yanwen,Wang Lianhui,Hou Wenhua
Flexible and micro-sized energy conversion/ storage components are extremely demanding in portable and multifunctional electronic devices, especially those small, flexible, roll-up and even wearable ones. Here in this paper, a two-step electrochemical deposition method has been developed to coat Ni fibers with reduced graphene oxide and MnO 2 subsequently, giving rise to Ni@reduced-graphene-oxide@MnO 2 sheath-core flexible electrode with a high areal specific capacitance of 119.4 mF cm −2 at a current density of 0.5 mA cm −2 in 1 mol L −1 Na 2 SO 4 electrolyte. Using polyvinyl alcohol (PVA)- LiCl as a solid state electrolyte, two Ni@reduced-grapheneoxide@ MnO 2 flexible electrodes were assembled into a freestanding, lightweight, symmetrical fiber-shaped micro-supercapacitor device with a maximum areal capacitance of 26.9 mF cm −2 . A high power density of 0.1W cm −3 could be obtained when the energy density was as high as 0.27 mW h cm −3 . Moreover, the resulting micro-supercapacitor device also demonstrated good flexibility and high cyclic stability. The present work provides a simple, facile and low-cost method for the fabrication of flexible, lightweight and wearable energy conversion/storage micro-devices with a high-performance.
研究领域:
材料科学
·
能量存储与转换
·
纳米技术
·
电化学
·
柔性电子学
✓ 已验证
DOI
高影响因子
AMB Express
·
2019
·Vol. 9
·期 1
·2
·
IF 2.226
Feng Rongfang,Xu Meiying,Li Jianjun,Huang Shaobin,Zhao Gang,Tu Xiang,Sun Guoping,Guo Jun
Two biotrickling filters were operated in continuous (BTF1) and discontinuous (BTF2) modes at a constant empty bed residence time of 60 s for 60 days. From day 60, the operation mode of each BTF was oppositely switched. Higher removal efficiencies of five aromatic pollutants were recorded with BTF1 (> 77.2%). The switch in the operation mode did not alter the removal performance of BTF1. Comparatively, BTF2 was not successfully acclimated in the discontinuous operation mode. Once the mode had been switched to continuous mode, the removal efficiencies of BTF2 on all pollutants increased drastically and finally exceeded the values observed in BTF1, with the single exception of p -xylene. Principle coordinate analysis and analysis of similarities (ANOSIM) showed that the structure of the microbial communities differed considerably between both BTFs (R = 1.000, p < 0.01) as well as before and after the switch in BTF2 (R = 0.996, p < 0.01). The random forest model demonstrated that Mycobacterium , Burkholderia , and Comamonas were the three most important bacterial genera contributing to the differences in microbial communities between the two BTFs. Metagenomics inferred by PICUSt (phylogenetic investigation of communities by reconstruction of unobserved states) indicated that BTF2 had high degradation potential for aromatic pollutants, although those genes involved in biofilm formation were less active in BTF2 than those in BTF1.
研究领域:
环境微生物学
·
生物修复
·
废水与空气污染控制
·
微生物生态学
·
生物信息学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 3
·2343-2350
·
IF 2.993
Wang Yaxiong,Liu Ping,Wang Honghang,Zeng Baoqing,Wang Jianghao,Chi Feng
Applying copper nanowires (CuNWs) composite transparent conductive electrode (CTCE) as transparent conductive anode, a flexible organic light-emitting device (OLED) is demonstrated in this paper. Ultralong CuNWs were synthesized by a simple hydrothermal method. The random conductive grid of CuNWs was transferred to the surface of flexible substrates by vacuum filtration method. In order to reduce the surface roughness and improve work function, polymethyl methacrylate (PMMA) solution and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) solution were spin-coated on the surface of CuNW transparent conductive electrode (TCE) in turn. The CuNW/PMMA/PEDOT:PSS CTCE was applied to an OLED, and the experiment shows that the OLED was of high efficiency. On comparing the OLED with PEDOT:PSS TCE, the maximum brightness and maximum current density of the OLED with CuNW/PMMA/PEDOT:PSS CTCE were increased by 104% and 4 times, respectively.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
柔性电子学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2014
·Vol. 32
·期 8
·1099-1110
·
IF 1.42
Yu Rui-lei,Zhang Li-sheng,Feng Yu-hong,Zhang Ruo-yu,Zhu Jin
Polylactide (PLA) was successfully toughened by blending with bio-based poly(ester)urethane (TPU) elastomers which contained bio-based polyester soft segments synthesized from biomass diols and diacids. The miscibility, mechanical properties, phase morphology and toughening mechanism of the blend were investigated. Both DSC and DMTA results manifested that the addition of TPU elastomer not only accelerated the crystallization rate, but also increased the final degree of crystallinity, which proved that TPU has limited miscibility with PLA and has functioned as a plasticizer. All the blend samples showed distinct phase separation phenomenon with sea-island structure under SEM observation and the rubber particle size in the PLA matrix increased with the increased contents of TPU. The mechanical property variation of PLA/TPU blends could be quantitatively explained by Wu’s model. With the variation of TPU, a brittle-ductile transition has been observed for the TPU/PLA blends. When these blends were under tensile stress conditions, the TPU particles could be debonded from the PLA matrix and the blends showed a high ability to induce large area plastic deformation before break, which was important for the dissipation of the breaking energy. Such mechanism was demonstrated by tensile tests and scanning electron microcopy (SEM) observations.
研究领域:
高分子科学
·
材料工程
·
生物聚合物
·
塑料与复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）