INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Bin Hu,Wenchao Zhang,Chunpei Yu,Zilong Zheng,Yajie Chen,Jiaxin Wang,Jingping Liu,Kefeng Ma,Wei Ren
The CuO micro/nanowires film has been prepared successfully on a Cu substrate using a combination of an electrochemical anodization and an annealing treatment. Its morphology and phase composition have been systemically examined. The vertically aligned CuO micro/nanowires can form a skeleton to facilitate the embedment of Al nanoparticles so that their interfacial contacts will expand significantly to increase the total energy release. The CuO micro/nanowires can be used to synthesize the Al/CuO composite thermite film using an electrophoretic deposition of Al nanoparticles. The thermal analyses reveal that the Al/CuO composite thermite film can release a heat output of 2009 J·g–1 at 10 min deposition. This work develops an effective protocol for the synthesis of the Al/CuO composite thermite film, which is highly compatible with microelectromechanical systems to realize functional energetic chips.
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 44
·25266-25273
·
IF 3.049
Jiaxing Song,Tao Guo,Wen Ding,Miao Yao,Fengli Bei,Xiaonan Zhang,Junyi Huang,Xiang Fang
To explore the effect of the addition of poly(vinylidene fluorine) (PVDF) to a nanothermite system, an Al/MnO2/PVDF energetic nanocomposite was prepared using an electrospray method, Al/MnO2 nanothermite was prepared as a control group. Then, the energetic nanocomposite and nanothermite were tested and analyzed by XRD, FE-SEM and TG-DSC, and the reaction products were collected. The results show that energetic nanocomposite would have three obvious exothermic peaks in the range of room temperature to 800 °C with a total more than 1700 J g−1 heat release while the control experiment, Al/MnO2 nanothermite, could be found one exothermic peak with a 1100 J g−1 heat release. The residues are mainly MnAl2O4, MnF2 and AlF3 which indicates that Al/MnO2/PVDF energetic nanocomposite could make full use of manganese oxide. Finally, thermal analysis experiments were carried out under different heating rates to calculate the activation energy. The calculation results show that the addition of PVDF could significantly reduce the activation energy, which would help spark the thermite at comparatively low energy and temperature.
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高影响因子
MATERIALS LETTERS
·
2019
·
IF 3.019
Hongqin Ma,Meijie Wang,Jiasheng Zhang,Shuai Sun
To circumvent the liquid-solid separation and dispersion of the powdered adsorbent during adsorption-desorption circulation, using a drop-oil sol-gel method, the spherical ZrO(OH) 2 /AlOOH hybrid composite beads were prepared as an adsorbent for sulfate adsorption removal from water. The preparation mechanism was proposed and discussed in term of the characterization results showing that the as-prepared beads is an amorphous mesoporous material constructed from nanoflakes composed of rod-like nanoparticles, and possesses a good sphericity, a relatively high specific surface area (195.56 m 2 /g) and adequate mechanic strength (Zr/Al(0.2)-30-3.5, 32.1 N). The adsorption tests indicated that the saturated adsorption capacity increases with sulfate concentration and decreases with prolongation of adsorbent drying time, owing to the reduction of water content, the maximum adsorption capacity can reach 205 mg/g (Zr/Al(0.2)-30-2). This work has a profound significance for the further research and industrial application of spherical adsorbent related to hydrate zirconia in fixed adsorption bed.
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高影响因子
FUEL
·
2019
·
IF 5.128
Min Zhong,Yuanyuan Guo,Jungang Wang,Congbiao Chen,Zhancheng Ma,Litao Jia,Bo Hou,Debao Li
The development of alternative to silicon carbide (SiC) holds great promise in energy and environmental related catalysis because the harsh preparation process and high cost limit its large-scale application. In this work, the core-shell structured ZnAl 2 O 4 @Al ceramic-metal composites (Zn-Al-T) are prepared from low cost metallic Al powder by a facile and environment-friendly approach to replace silicon carbide for Co-based Fischer-Tropsch synthesis (FTS, a typical strong exothermic heterogeneous catalytic reaction). The composition, thermal conductivity, surface chemical properties and pore configuration of the ZnAl 2 O 4 @Al composites can be easily modulated by controlling the calcination condition. Among Zn-Al-T composites, the Zn-Al-650 and Zn-Al-750 samples demonstrate optimum coupling of physicochemical properties, i.e., robust chemical stability, meso -macropore structure (wide mesopore and high macroporosity) and high thermal conductivity. Thus, the excellent FT performance (low CH 4 selectivity and high selectivity to C 5+ ) was obtained on the Co/Zn-Al-650 and Co/Zn-Al-750 catalysts. The heat transfer experiments were conducted on a special tubular fixed-bed reactor (I.D. = 22 mm) under near-industrial conditions. At similar reaction rates, the effective radial thermal conductivity coefficient (k eaff ) in the Co/Zn-Al-650 catalyst bed is 3–4 times and 1–2 times that in the Co/Al 2 O 3 and Co/SiC catalyst beds respectively, resulting in a more uniform temperature distribution in Co/Zn-Al-650 catalyst bed. In addition, the ZnAl 2 O 4 @Al composite has wide application prospect in strong exothermic/endothermic catalytic system owing to its high thermal conductivity, adjustable physico-chemical properties, facile preparation method and low cost.
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TRIBOLOGY LETTERS
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2019
·Vol. 67
·期 3
·1-11
·
IF 2.235
Zeng M. Q.,Hu R. Z.,Song K. Q.,Dai L. Y.,Lu Z. C.
An in situ displacement reaction was used to prepare an Al–12 wt% Sn nanocomposite alloy from mechanically alloyed Al–SnO 2 –MgH 2 . The nanoscaled Sn phase was mostly 30–50 nm in size and was distributed uniformly in the Al matrix. The wear properties of the Al–SnO 2 –MgH 2 composite were enhanced significantly compared to those of an Al–Sn–MgH 2 composite. These improvements stemmed from the high-strength and nanoconfined Sn-phase lubrication, which moved the peak stress far below the surface, released strain localization at the uppermost sliding surface layer, and suppressed cracking and surface roughening. The dispersion strengthening of the Al–SnO 2 –MgH 2 composite favored the maintenance of a stable tribolayer, which resulted in an integrated worn surface and an excellent wear performance.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zhenguo Wang,Ke Yu,Yu Feng,Ruijuan Qi,Jie Ren,Ziqiang Zhu
MXenes, a new class of two-dimensional materials, possessing high electrical conductivity and unique surface properties，have exhibited great potential as non-noble metal catalyst for hydrogen evolution reaction (HER). However, due to poor oxidation resistance , they are easily oxidized in aqueous solution and high humidity environment, resulting in a great loss of electronic properties and surface reactivity. Herein, we report a simple and effective composite synthesis strategy with TiOF 2 intercalation to improve the stability of MXenes materials. TiOF 2 @Ti 3 C 2 T x prepared by this strategy shows ultra-long catalytic activity life of 1000 cycles in acid electrolyte. Besides，the catalyst also shows high HER activity with a low onset potential of 103 mV and a Tafel slope as low as 56.2 mV dec − 1 . Benefiting from the stabilization of TiOF 2 and the physicochemical properties of Ti 3 C 2 T x , TiOF 2 @Ti 3 C 2 T x also exhibits excellent humidity sensitivity and stability.
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高影响因子
ADVANCED ENGINEERING MATERIALS
·
2019
·Vol. 21
·期 8
·1900176
·
IF 2.906
Tao Yan,Hui Ren,Yaru Li,Huixin Wang,Qingjie Jiao
Porous nano-aluminum@polymer microspheres with a narrow size range are fabricated to exploit the energy advantages of nano-aluminum (nAl). Nitrocellulose (NC) and glycidyl azide polymer (GAP) act as functional binders and adhere tightly to the surface of nAl particles and aggregate them into spheres. The formed holes on the microsphere surface are considered gas diffusion channels to the microsphere interior. Confined combustion results show that nAl@GAP microspheres generate the highest peak pressure, and maximum pressurization rate of nAl@NC microspheres is comparatively higher than that of others. Given the microsphere structure, thermal behavior in air shows that the oxidation-reaction mechanism of the microspheres is close to that of nAl particles. Interfacial reactions between nAl particles and gases produced by polymer decomposition enhance microsphere reactivity. The heat released by polymer decomposition maintains the structure, activates nAl particles, and accelerates combustion propagation, which are positively correlated with the energy content of the polymer. The unconfined test results showed that nAl@GAP microsphere combustion propagates faster than that of nAl@NC microspheres.
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ACS Nano
·
2020
·
IF 14.588
Xinliang Li,Mian Li,Qi Yang,Hongfei Li,Hailong Xu,Zhifang Chai,Ke Chen,Zhuoxin Liu,Zijie Tang,Longtao Ma,Zhaodong Huang,Binbin Dong,Xiaowei Yin,Qing Huang,Chunyi Zhi
Nonbattery behavior related phase transition of electrodes is usually not favorable for any batteries because it results in performance degradation at all times. Here, we demonstrate a zinc hybrid-ion battery (ZHIB) with an unusual capacity enhancement even within 18 000 cycles by employing V2CTX MXene as the cathode, enormously differing from all reported counterparts with capacity degradation initiated within hundreds of cycles. The dominated mechanisms are determined to be MXene delamination and an unexpected phase transition during cycling. Both the original cathode and secondary derivative contribute to capacity simultaneously, resulting in the unusual capacity enhancement. Consequently, the specific capacity of 508 mAh g–1 (highest for all reported aqueous zinc-ion batteries) and high energy density of 386.2 Wh kg–1 are realized. Also, the quasi-solid-state batteries fabricated can output stably at −20 °C and in bending, twisting, stabbing, and cutting conditions. Our work brings an effective approach, that is, utilizing “unstable” electrode materials, which should usually be avoided, to achieve continuously enhanced performance of a battery. The idea to use both original and secondary materials for energy storage may be developed to be a general method to achieve extraordinary cycling stability of batteries.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2019
·
IF 6.309
Zhongyang Wang,Kai Sun,Peitao Xie,Yao Liu,Qilin Gu,Runhua Fan
The insulator-conductor percolative composites have been mostly constructed to achieve high permittivity and negative permittivity. In this work, permittivity transition from positive to negative is investigated in acrylic polyurethane-aluminum (APu/Al) percolative composites at radio frequency. Both the high permittivity and negative permittivity are accompanied with low loss due to the self-passivated nature of aluminum . The reactance and ac conductivity are studied to explain the dielectric properties , which provides an essential insight into the universal principles of high permittivity and negative permittivity behaviors in percolative composites. Meanwhile, when the conductive filler content exceeds the percolation threshold, a derived formula of permittivity has been put forward on the basis of the existing theoretical framework of percolation theory. Resourceful dielectric properties of APu/Al percolative composites will make them as potential alternatives for capacitors and metamaterials.
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高影响因子
POWDER METALLURGY
·
2019
·
IF 1.149
Jiaxin Li,Yuhong Chen,Yongquan Li,Zhangjun Bai,Kang Wang
Alloys with composition of Ta-10 wt.% W and Ta-10 wt.% W-6 wt.% Al, respectively, were prepared by the hot-press sintering process. The oxidation behaviour at 900°C and 1000°C was studied. The oxidation weight gain curves of the Ta–10%W alloy followed the linear law and the final oxidation product was Ta2O5 solid solution. Meanwhile, due to the addition of Al, the oxidation weight gain curves of the Ta–10%W–6%Al alloy followed the parabolic law. The final oxidation products at 900°C formed a dense outer layer Al2O3 and an inner layer. However, after being oxidised at 1000°C, the oxidation products included Al2O3, AlTaO4 and Ta22W4O67. Since the dense Al2O3 oxide film was consumed by the generation of AlTaO4, the inward diffusion of oxygen cannot be prevented. The oxidation resistance degraded at 1000°C. The addition of Al significantly improved the oxidation resistance of the Ta-W-based alloy system.
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Nanoscale
·
2019
·Vol. 11
·期 36
·16781-16787
·
IF 6.97
Na Li,Zheng Yi,Ning Lin,Yitai Qian
The application of Si-based anode materials is hindered by their extreme volume change, poor cycling stability, and low coulombic efficiency. Solving these problems generally requires a combination of strategies, such as nanostructure designing or surface coating. However, these strategies increase the difficulty of the fabrication process. Herein, a simple and one-pot replacement reaction route was designed to produce an Al2O3 layer anchored on mesoporous Si nanospheres (Si@Al2O3) by employing Al nanospheres with a naturally formed Al2O3 layer as a reducing agent and self-sacrificial template. The obtained Si@Al2O3 was mesoporous, with enough porous space to buffer the volume change and provide a fast lithium ion transfer channel. Furthermore, the coated Al2O3 layer could stabilize the structure and SEI layer of the mesoporous Si nanospheres, endowing the Si@Al2O3 nanospheres with improved initial coulombic efficiency, cycling performance and rate capability. As a result, a high capacity of 1750.2 mA h g−1 at 0.5 A g−1 after 120 cycles and 1001.7 mA h g−1 at 2 A g−1 after 500 cycles were delivered for lithium ion batteries. The good performance could be attributed to the mesoporous structure and the outer-coated Al2O3 layer.
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MATERIALS & DESIGN
·
2018
·
IF 4.525
Yajie Chen,Wenchao Zhang,Chunpei Yu,Debin Ni,Kefeng Ma,Jiahai Ye
NiCo 2 O 4 has been selected as an oxidizer to realize the nanothermite film for the first time in this study. The NiCo 2 O 4 /Al core-shell nanowires (NWs) thermite film has been fabricated using a facile hydrothermal-annealing synthesis method and a controllable magnetron sputtering process. The as-obtained NiCo 2 O 4 /Al NWs thermite film shows a uniform structure and distribution on the substrate, with a favorable interfacial contact between the bimetallic oxide and the fuel at the nanoscale . It is found that the quantity of Al plays a key role in the total heat release magnitude. The maximal heat release of the NiCo 2 O 4 /Al nanothermite film has reached 2076.0 J/g at the optimal Al deposited thickness of 450 nm with the obtained optimum Al/NiCo 2 O 4 molar ratio of 4.9. Moreover, this design strategy is highly compatible with microelectromechanical systems (MEMs) and it can be applied to realize other nanothermites composed by bimetallic oxide and fuel.
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