INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Yi-Ren Tang,Da-Wei Lin,Yang Gao,Jun Xu,Bao-Hua Guo
Hydroxyl-functional hexagonal boron nitride nanosheets (OH-BNNSs) were prepared successfully by ultrasonic treatment, and then homogeneous dispersions of OH-BNNSs in 1,4-butanediol (BDO) were obtained. Various techniques were applied to characterize the OH-BNNSs and their hydroxyl functional groupd. Furthermore, biodegradable poly(butylene succinate) (PBS)/OH-BNNS nanocomposites were prepared by in situ polymerization of succinate acid (SA) and BDO containing well-dispersed OH-BNNS. The nucleating effect of low OH-BNNS loadings on PBS in the PBS/OH-BNNS nanocomposites was investigated. It is found that OH-BNNSs significantly improve the melt-crystallization temperature and degree of crystallinity of PBS during the nonisothermal crystallization process without changing the crystal structure of PBS. Moreover, the Avrami exponent n calculated for isothermal crystallization increased from 2 to 3 after the addition of 0.05 wt % OH-BNNSs. The nucleation density of PBS spherulites in the nanocomposites increased dramatically. These results demonstrate that OH-BNNSs function as an outstanding nucleating agent of PBS.
研究领域:
高分子材料科学
·
生物降解材料
·
纳米复合材料
·
结晶动力学
·
功能化纳米填料
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Tao Zhang,Hongqiang Yan,Lie Shen,Zhengping Fang,Xianming Zhang,Jiajun Wang,Baoyue Zhang
We describe the preparation and characterization of a green and renewable polyelectrolyte complex (PEC) containing phosphorus, nitrogen and carbon elements, based on the ionic complexation between chitosan and phytic acid. Introduction of this PEC to ethylene–vinyl acetate copolymer (EVA) leads to an improvement of the flame retardancy. As for the EVA/PEC composites with 20.0 wt % of PEC (EVA/20PEC), the char residue at 600 °C is 12 wt % higher than that of the pristine EVA under nitrogen atmosphere. Compared to the pristine EVA, the peak heat release rate and total heat release of EVA/20PEC show 249 W g–1 and 5.6 kJ g–1 decreases, respectively. The char residue of EVA/20PEC is full and compact, demonstrating excellent intumescent effect. Introduction of this PEC also contributes to a slight increase of the Young’s modulus while maintains the excellent ductility. This work provides a new approach for the development of environmentally friendly intumescent flame retardant system.
研究领域:
高分子材料科学
·
阻燃化学
·
生物基材料
·
功能复合材料
·
环境友好材料
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Wei Bi,Yanjie Hu,Wenge Li,Hao Jiang,Chunzhong Li
In this work, a nanoreactor combining layers of facile traditional two-dimensional (2D) material, hexagonal boron nitride (h-BN, which often called the white graphene) with Pt/Al2O3 catalyst was designed to exhibit higher stability, activity, and selectivity in automobile exhaust treatment. Characterization revealed that h-BN does coat on the surface of platinum and forms a distinct Pt@h-BN/Al2O3 core–shell nanostructure. This as-prepared catalyst possesses good thermal stability and selectivity, because of the excellent high-temperature tolerance and the multidefected structure of the h-BN shell; that is, small molecules such as CO and O2 can easily intercalate into the nanoreactor, while large molecules such as propylene are blocked out. Meanwhile, the intercalated reactants can achieve the conversion of CO to CO2 faster (ΔT100 = 20 °C) with the confinement effect. The study indicates that constructing a nanoscale confined environment with two-dimensional (2D) coating can enhance the performance of the catalyst in multiple aspects and simultaneously provide a good example for designing nanostructured catalysts with multifaceted improvement.
研究领域:
催化化学
·
纳米材料科学
·
环境催化
·
能源化学
·
表面科学
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 47
·2303746
·
IF 13.3
Yayun Zheng,Shasha Wei,Jitao Shang,Du Wang,Cheng Lei,Yan Zhao
To make sodium-ion batteries a realistic option for everyday energy storage, a practicable method is to enhance the kinetics of Na + reactions through the development of structurally stable electrode materials. This study utilizes ternary Sn-based dichalcogenide (SnS 1.5 Se 0.5 ) in the design of electrode material to tackle several issues that adversely hinder the performance and longevity of sodium-ion batteries. First, the incorporation of Se into the SnS structure enhances its electrical conductivity and stability. Second, the ternary composition restricts the formation of intermediates during the desodiation/sodiation process, resulting in better electrode reaction reversibility. Finally, SnS 1.5 Se 0.5 lowers the diffusion barrier of Na, thereby facilitating rapid and efficient ion transport within the electrode material. Moreover, nitrogen and sulfur dual-doped carbon (NS-C) is used to enhance surface chemistry and ionic/electrical conductivity of SnS 1.5 Se 0.5 , leading to a pseudocapacitive storage effect that presents a promising potential for high-performance energy storage devices. The study has successfully developed a SnS 1.5 Se 0.5 /NS-C anode, exhibiting remarkable rate capability and cycle stability, retaining a capacity of 647 mAh g −1 even after 10 000 cycles at 5 A g −1 in half-cell tests. In full-cell tests, Na 3 V 2 (PO 4 ) 3 //SnS 1.5 Se 0.5 /NS-C delivers a high energy density of 176.6 Wh kg −1 . In addition, the Na + storage mechanism of SnS 1.5 Se 0.5 /NS-C is explored through ex situ tests and DFT calculations. The findings suggest that the ternary Sn-based dichalcogenides can considerably enhance the performance of the anode, enabling efficient large-scale storage of sodium. These findings hold great promise for the advancement of high-performance energy storage devices for practical applications.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米技术
·
固态化学
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2018
·Vol. 11
·期 24
·4256-4261
·
IF 7.411
Huajun Feng,Qiaoqi Guo,Yingfeng Xu,Ting Chen,Yuyang Zhou,Yigang Wang,Meizhen Wang,Dongsheng Shen
Photocatalytic conversion of CO 2 can provide a solution for simultaneously addressing global warming and solar fuel generation. However, its applicability is presently limited by the unsatisfactory photoconversion efficiency of the state-of-art photocatalysts. In this regard, enhancing CO 2 adsorption through surface modification could be an efficient way to improve the photoconversion efficiency. Herein, doping of nonpolar carbon quantum dots (CQDs) onto g-C 3 N 4 is reported for the construction of a metal-free heterojunction photocatalyst (CQDs/g-C 3 N 4 ). CQDs offer several advantages such as band-gap reduction and electron-withdrawing effect to improve light absorption and photocarrier separation efficiency. However, this study reveals that nonpolar CQDs could also improve CO 2 adsorption, photoinduced H 2 production, reaction kinetics, and alter CO 2 photoreduction pathways to generate CH 4 . Consequently, the CQDs/g-C 3 N 4 could generate six times more CO and CH 4 without detectable H 2 compared to pristine g-C 3 N 4 , under similar conditions. Therefore, this study demonstrates a promising strategy for efficient adsorption, activation, and subsequent photoreduction of CO 2 by nonpolar surface modification of g-C 3 N 4 . Graphical Fighting carbon with carbon : Incorporation of nonpolar carbon quantum dots on the surface of g-C 3 N 4 imparts several benefits, including band reduction, improved charge separation, and increased CO 2 adsorption. This enhances reaction kinetics and alters the pathways for photoreduction of CO 2 , thereby enabling efficient CO and CH 4 generation.
研究领域:
光催化
·
环境科学
·
材料化学
·
能源化学
·
物理化学
·
纳米材料
·
可持续能源
·
二氧化碳转化
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 46
·期 16
·25802-25807
·
IF 3.83
Jun Xiao,Yan Jia,Dongqing Liu,Haifeng Cheng
Manufacturing complexity and poor machinability hinder the preparation of complex-shaped ceramic composites. Three-dimensional printing can overcome this difficulty. Herein, we report a type of photocurable preceramic resin containing SiO 2 nanoparticles (up to 20 wt% of polymer), which do not affect the photocurability of the preceramic resin, and a small amount of SiC nanofibres (1 wt%). We successfully printed precise green bodies with a complex shape by digital light processing and converted them into ceramic composites via pyrolysis at 1300 °C under a N 2 atmosphere. The introduction of SiO 2 and SiC into the ceramic composites led to reduced weight loss of the composites during pyrolysis and a decrease in their porosity and enhancement in their mechanical properties after pyrolysis. The properties of the printed samples pyrolysed at different ramping rates were compared, and the effects of the microstructure on the mechanical properties of the composites were investigated.
研究领域:
材料科学
·
陶瓷工程
·
增材制造
·
高分子转化陶瓷
·
复合材料
✓ 已验证
DOI
高影响因子
IEEE TRANSACTIONS ON ELECTRON DEVICES
·
2024
·Vol. 71
·期 10
·6417-6423
·
IF 2.9
Peng Yang,Yudong Pang,Jiajia Zha,Haoxin Huang,Zhendong Jiang,Meng Zhang,Chaoliang Tan,Wugang Liao
This article utilizes low-frequency noise (LFN) measurements to evaluate the stability of tellurium (Te) field-effect transistor (FET). Our results show that LFN for Te FET on hexagonal boron nitride/silicon dioxide (h-BN/SiO2) tracks the trends of flicker noise (1/f noise) and decreases with increasing overdrive voltages, which is ascribed to the change of dominant carriers and the fluctuation of surface trap density. Compared with Te FET on SiO2, Te FET on h-BN/SiO2 reaches a lower LFN. To further investigate the mechanism of current fluctuation, surface trap density ( ${N} _{\text {st}}$ ) is extracted. The average value of ${N} _{\text {st}}$ for Te FETs on h-BN/SiO2 is smaller than that for Te FETs on SiO2. It is concluded that the introduction of atomically flat h-BN dielectric decreases ${N} _{\text {st}}$ , suggesting that Te FET on h-BN/SiO2 presents higher immunity to LFN and provides a design thought for devices with high stability in the future.
研究领域:
半导体器件物理
·
微电子学
·
凝聚态物理
·
材料科学
·
纳米电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yongkun Liu,Qiuling Lu,Zheng Huang,Shiqing Sun,Bo Yu,Uwamahoro Evariste,Guohua Jiang,Juming Yao
In this work, a novel flexible electrode material for supercapacitor is prepared by electrodeposition of Ni-Co-S interconnected nanosheet arrays on N-doped hierarchical porous carbon nanofibers (Ni-Co-S@N-pCNFs). The electrode exhibits a remarkable specific capacitance of 520.2 F g -1 at the current density of 0.2 A g −1 and 670 F g -1 at 2 mV s −1 . The activated charcoal (AC) loaded N-doped porous carbon nanofibers (AC@N-pCNFs) as electrode is also prepared which exhibits a specific capacitance of 257.2 F g -1 at 0.2 A g −1 , as well as excellent cycling stability with a capacitance retention of 92.6% after 5000 cycles. Furthermore, the Ni-Co-S@N-pCNFs as the positive electrode , active carbon loaded N-doped hierarchical porous carbon nanofibers (AC@N-pCNFs) as negative electrode , and KOH/NKK hybrids as both the electrolyte and separator are assembled into flexible asymmetric supercapacitor . The assembled supercapacitor device without using any current collectors or binders shows a high energy density of 21.6 Wh·kg −1 at a power density of 134.9 W kg −1 and robust long-term cycling stability retaining over 90.0% after 3000 cycles at 1.0 A g −1 . The as-assembled asymmetric supercapacitors (ASCs) have an outstanding mechanical flexibility and electrochemical stability and no significant attenuation occurred during cycling under different bending states.
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能器件
·
功能材料
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 8
·7499-7510
·
IF 2.741
Yu Chenglong,Chen Feng,Dong Lifu,Liu Xiaoqing,Huang Bichun,Wang Xinnan,Zhong Shengbang
Manganese-rich MnSAPO-34 molecular sieves were prepared by one-pot synthesis method for NO
x
abatement using the ammonia-selective catalytic reduction (NH 3 -SCR) technology and characterized using ICP, BET, XRD, FE-SEM, H 2 -TPR, NH 3 -TPD, XPS, and DR UV-Vis analyses. The experimental results indicate that the Mn content and chemical state, as well as the surface acidity, of the MnSAPO-34 molecular sieves significantly enhance their DeNO
x
efficiency at low temperatures (ca. 200–300 °C). The manganese-rich MnSAPO-34 was synthesized using a combination of triethylamine and diisopropylamine as the structural directing agents and high Mn loading ( n (MnO)/ n (P 2 O 5 ) = 0.4). The resulting catalyst exhibits the highest activity among all of the samples with a NO
x
conversion value of nearly 95% and a N 2 selectivity that is higher than 90% at 220–400 °C. In addition, this catalyst presents higher NO
x
conversion than the conventional V 2 O 5 -WO 3 /TiO 2 catalysts and other SAPO-based catalysts below 300 °C. Furthermore, the analytical results indicate that the manganese species in the catalyst are mainly in the form of a framework Mn(IV), which could play a significant role in the NH 3 -SCR process as the specific active species. The results suggest that controlling the types and content of the organic amine templates and variations in the surface acidity of the catalysts may significantly enhance the SCR activity at lower temperatures.
研究领域:
环境催化
·
材料化学
·
工业催化
·
大气污染控制
·
无机多孔材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 46
·26513-26523
·
IF 10.733
Peng Huang,Min Huang,Hai Hu,Yuan Zhong,Chao Lai,Shulei Chou
The push for high performing electronic devices with long battery lives has rapidly advanced the field of energy storage systems. Niobium oxides have stood out as promising candidates to improve the storage and rate performance of anodes in lithium- and especially sodium-ion batteries due to their larger interplanar lattice spacing and patulous framework. Herein, we report the first synthesis of a nanosized metal/metal oxide hybrid composite coated by N-doped carbon and anchored onto reduced graphene oxide (NbO/Cu@NC-RGO) through in situ carbonizing of Cu-doped polyoxoniobate precursors. The strong synergistic effects between the uniformly distributed NbO/Cu hybrid nanoparticles, the N-doped carbon coating layer, and graphene substrates not only ensure efficient electron and ion transport, but also boost pseudocapacitive charge storage. The resulting composite exhibits a maximum reversible charge capacity of 580 mA h g−1 after 100 cycles at a current density of 100 mA g−1 when utilized in lithium-ion batteries (LIBs), and 203 mA h g−1 when utilized in sodium-ion batteries (SIBs). For SIBs in particular, a long-lifetime of 1012 cycles is observed when cycled at a high current density of 800 mA g−1. This work represents a promising step forward in the design and preparation of metal oxide composite anodes for LIBs and SIBs.
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能技术
·
无机化学
·
先进电池材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yong Zhang,Ming Li,Shengkui Zhong,Yulei Sui,Xiaoping Zhang,Xinyu Li,Ling Wu
It is a great challenge to develop the cathode materials with high efficiency, long life and low-cost for lithium-sulfur batteries. In this paper, we design a simple hydrothermal method to synthesize MoS 2 wrapped the MOFs-derived N-doped carbon nanorods as an effective sulfur host to improve the electrochemical performance of lithium-sulfur batteries. In the hydrothermal process, the cubic zeolitic imidazolate framework-67 (ZIF67) particles are connected together to form nanorods , and MoS 2 nanosheets are wrapped on the surface of the nanorods. In this composite, the carbon nanorods derived from ZIF67 is the main host for S-loading, while N-doping can change the hybrid orbital form of carbon and significantly improve the chemical adsorption of polysulfide . The elemental cobalt and cobalt oxide derived from ZIF67 can improve the electronic conductivity and polarity of the composite. And MoS 2 coating layer can provide more active sites, accelerate the sulfur redox reactions and effectively restrain the shuttle effect. The synergetic effects of above-mentioned factors make the MoS 2 @CZIF67/S composite cathode material shows excellent electrochemical performance. The composite shows high reversible specific capacities of 1391.9 and 806.1 mAh g −1 at 0.1C and 1C rate, respectively, and exhibits a capacity retention of 70.5% after 400 cycles at 1C rate.
研究领域:
材料科学
·
电化学
·
纳米能源材料
·
储能技术
·
先进电池
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xiaoxue Li,Keyu Xie,Long Song,Mengjia Zhao,Zhipan Zhang
The effective separation of photogenerated electrons and holes in photocatalysts is a prerequisite for efficient photocatalytic water splitting. CuInS2 (CIS) is a widely used light absorber that works properly in photovoltaics but only shows limited performance in solar-driven hydrogen evolution due to its intrinsically severe charge recombination. Here, we prepare hierarchical graphitic C3N4-supported CuInS2 (denoted as GsC) by an in situ growth of CIS directly on exfoliated thin graphitic C3N4 nanosheets (g-C3N4 NS) and demonstrate efficient separation of photoinduced charge carriers in the GsC by forming the Z-scheme system for the first time in CIS-catalyzed water splitting. Under visible light illumination, the GsC features an enhanced hydrogen evolution rate up to 1290 μmol g–1 h–1, which is 3.3 and 6.1 times higher than that of g-C3N4 NS and bare-CIS, respectively, thus setting a new performance benchmark for CIS-based water-splitting photocatalysts.
研究领域:
材料化学
·
光催化
·
能源化学
·
纳米材料
·
可持续能源
·
半导体物理
·
表面科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）