APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Huifang Wang,Jun Zhang,Qichong Zhang,Hao Wu,Xiaohong Xu
The p-n heterojunctions with the built-in electric field are often adopted to promote the separation of photoexcited electron-hole pairs and enhance the photoelectrochemical (PEC) performance. However, the interface states often affect the band alignment of ZnO/Cu 2 O heterointerface and cause the decline of PEC performance. In this study, the ultrathin insulating Al 2 O 3 layer was introduced to modify the interface between n-type ZnO nanorod arrays (NRA) and p-type Cu 2 O. Compared to that of ZnO NRA/Cu 2 O, the photocurrent density is significantly improved and onset potential shifts negatively for ZnO NRA-Al 2 O 3 /Cu 2 O. The Al 2 O 3 ultrathin layer is deemed to suppress the photoexcited carriers trapped by the heavy interface defect states via improving the interface quality and block the recombination between electrons in the conduction band of ZnO NRA and holes in the valence band of Cu 2 O. This work broadens the interface modification method of p-n heterojunction and its results are favorable for photovoltaic devices, photodetection and PEC water splitting applications.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Bingbing Chen,Aihu Feng,Kun Liu,Jiao Wu,Yun Yu,Lixin Song
Ti 3 C 2 T x is a promising intercalation-type electrode material for capacitive deionization (CDI). However, Ti 3 C 2 T x , obtained from traditional synthesized Ti 3 AlC 2 , is with large particle size and undersized interlayer space, which can easily lead to the longer ion diffusion path, fewer adsorption sites, and higher ion diffusion barrier in CDI process. In this work, subsize and Na + intercalated Ti 3 C 2 T x (Na + -Ti 3 C 2 T x -MS) was prepared by HF etching KCl-assisted molten-salt synthesized Ti 3 AlC 2 and following NaOH treatment. The Na + -Ti 3 C 2 T x -MS achieves a high electrosorption capacity of 14.8 mg/g and a high charge efficiency of 0.81 at the applied voltage of 1.2 V in 100 mg/L NaCl solution. Besides, the stable desalination performance of Na + -Ti 3 C 2 T x -MS has been confirmed. The superior performance of Na + -Ti 3 C 2 T x -MS can be attributed to the subsize particle and larger interlayer space. Both two factors can effectively increase ions adsorption sites, shorten diffusion path lengths, and reduce diffusion barriers in the CDI process.
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DOI
高影响因子
Energy Storage Materials
·
2020
·
IF 16.28
Yu Long,Huan Li,Mingchun Ye,Zhengyu Chen,Zihan Wang,Ying Tao,Zhe Weng,Shi-Zhang Qiao,Quan-Hong Yang
Great progress has been made in the development of cathode materials for Al-metal batteries . However, the in-depth study of Al anodes, especially the battery instability caused by Al dendrite growth, has not received much attention. In this work, we have identified the in-situ formation of Al dendrite growth, which is proved to bottleneck the practical use of Al-metal batteries. The dendrite formation severely affects battery performance, such as voltage and efficiency fluctuations, unstable cycling, etc. To further demonstrate the detailed growing process of dendrites, we make a comprehensive investigation into the interfacial chemistry of Al anode. We have found that the naturally formed Al 2 O 3 surface film is dissolved in the ionic liquid electrolyte during Al plating, accompanied by the formation of solid-electrolyte interphase containing Al-Cl and Al-O like species on the anode surface before dendrite growth. To suppress this dendrite growth, we propose the use of porous Al, which provides a homogeneous ion flux and decreases the local current density. As a result, the porous anode maintains stable cycling over a wide range of current densities and areal capacities. The Al-graphite battery shows stable cycling up to 18000 times without capacity decay. This work suggests the significance of suppressing dendrite growth for the real applications and commercialization of Al-metal batteries and will draw attention to the battery design from the anode side .
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高影响因子
CORROSION SCIENCE
·
2020
·
IF 6.479
Xiaobang Liu,Ting Yue,Kai Qi,Bao Yu Xia,Zhenyu Chen,Yubing Qiu,Xingpeng Guo
Metal-organic framework (MOF) membranes as anticorrosion coatings are fabricated onto diverse metal surfaces via a versatile approach based on utilization of polydopamine layer, whose strong adhesion and metal-chelating capabilities promote heterogeneous nucleation and growth of MOF membranes. The anticorrosion property of MOF membranes has been achieved owing to characters of well-intergrown crystals, compact structure, hydrophobicity and effective rejection of corrosive ions of MOF membranes, and would be affected by MOF crystal size, membrane thickness and metal substrate. This study may shed some valuable light on the construction of MOF-based protective coatings as qualified and important candidates for high-performance anticorrosion applications.
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DOI
高影响因子
COMBUSTION AND FLAME
·
2020
·
IF 4.57
Qianqian He,Jun Wang,Yaofeng Mao,Huamo Yin,Wei Cao,Fude Nie
The incorporation of aluminum (Al) into explosives represents a facility and efficient way to enhance the energy output through the secondary reaction between Al and the detonation products of explosive. The Al/O ratio and microstructure of HMX/Al play critical roles in combustion performance and energy output. Herein, a gradient structured HMX/Al composite has been designed and fabricated via 3D printing technology using well-dispersed HMX/Al-based ink. For HMX/Al lines, the second reaction heat increases from 196.5 J/g to 1644.8 J/g and the burning rate would decrease from 14.6 to 12.0 mm/s with Al content increased from 10 to 30 wt%. For gradient structured HMX/Al, the burning rate could be controlled by varying the component ratio and the burning rate of each component in the gradient structure was higher than that of the normal HMX/Al counterpart. Furthermore, a gradient evolution of pressure output was monitored for gradient structured HMX/Al cylinder ignited by the laser. These results indicate that the gradient structure as an effective approach can tune combustion performance and energy output of HMX/Al.
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高影响因子
Physica Status Solidi-Rapid Research Letters
·
2020
·Vol. 15
·期 4
·2000563
·
IF 2.291
Xinhua Li,Qingshuang Ma,Ji Dong,Tansir Ahamad,Zongqing Ma
The Nb 3 (Al 1− x Sn x ) superconductor with enhanced critical current density ( J c ) is prepared by the process of mechanical alloying (MA) and subsequent low-temperature sintering and the enhancement mechanism of J c in Nb 3 (Al 1− x Sn x ) is discussed. The analysis of the flux pinning force implies that there is an additional pinning mechanism apart from grain boundary pinning in Nb 3 (Al 1− x Sn x ). The existence of dispersed Nb 2 Al nanoparticles (<30 nm) in Nb 3 (Al 1− x Sn x ) is confirmed by microstructure observation. These nanosized Nb 2 Al particles can serve as flux pinning centers, which leads to the increase of the flux pinning force as well as the enhancement of Nb 3 (Al 1− x Sn x )'s J c performance.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Chen Liang,Wensheng Liu,Qiang Liu,Yangrui Gao,Jijin Liu,Juan Wang,Shuwei Yao,Yunzhu Ma
Thermal decomposition is a critical process for fabricating alumina fibers using sol-gel methods. In this work, effects of preheating time on microstructure of prepared alumina fibers were studied. Results showed that core-sheath structure formed in the fibers when holding time exceeded 2 h at 400 °C. The fibers having core-sheath structure after thermal decomposition showed more residues, smaller crystal grain size and lower density. Thermal decomposition and densification of fibers were investigated. Results showed that core-sheath structure formed because fiber surface and core underwent different decomposition reactions due to the reduction in the number of gas channels on the fiber surface. This work provides a comprehensive study of thermal decomposition of precursor fibers and provides guidelines for developing appropriate calcination schedules.
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高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 32
·期 1
·015708
·
IF 3.551
Ze-Ru Zhu,Wenming Geng,Qingxia Zhu,Anita Sagadevan Ethiraj,Tao Wang,Li-Chao Jing,Yu-Jie Ning,Yi Tian,Wen-Hao Geng,Lei Wu,Hong-Zhang Geng
In this paper, we used tannic acid (TA) functionalized carbon nanotubes (TCNTs), and silver nanowires (AgNWs) to construct a new type of transparent conductive film (TCF) with a double-layered conductive network structure. The hybrid film exhibits excellent light transmittance, high electrical conductivity, ultra-flexibility, and strong adhesion. These outstanding performances benefit from the filling and adhesion of hydrophilic TCNT layers to the AgNW networks. Besides, we introduced the post-treatment process of mechanical pressing and covering polymer conductive polymer PEDOT:PSS, which obtained three layers of TCNT/AgNW/PEDOT hybrid film and greatly improved the comprehensive properties. The hybrid film can reach a sheet resistance of 9.2 Ω sq−1 with a transmittance of 83.4% at 550 nm wavelength, and a low root mean square (RMS) roughness (approximately 3.8 nm). After 10 000 bends and tape testing, the conductivity and transmittance of the hybrid film remain stable. The resistance of the film has no significant degradation after 14 d of exposure to high temperature of 85 °C and humidity of 85%, indicating excellent stability. The organic light-emitting diodes (OLEDs) with TCNT/AgNW/PEDOT hybrid film as anode exhibit high current density and luminosity, confirming this process has considerable potential application in photovoltaic devices.
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DOI
PubMed
高影响因子
Nano Research
·
2020
·Vol. 14
·期 3
·646-653
·
IF 8.183
Jiao Handong,Jiao Shuqiang,Song Wei-Li,Xiao Xiang,She Dongmei,Li Na,Chen Haosen,Tu Jiguo,Wang Mingyong,Fang Daining
Rechargeable Al-ion batteries (AIBs) are considered as one of the most fascinating energy storage systems due to abundant Al resource and low cost. However, the cycling stability is subjected to critical problems for using Al foil as negative electrode, including Al dendrites, corrosion and pulverization. For addressing these problems, here a lightweight self-supporting N-doped carbon rod array (NCRA) is demonstrated for a long-life negative electrode in AIBs. Experimental analysis and first-principle calculations reveal the storage mechanism involving the induced deposition of N-containing function groups to Al as well as the ideal skeleton of the NCRA matrix for Al plating/stripping, which is favorable for regulating Al nucleation and suppressing dendrites growth. Compared with the Al foil, the NCRA exhibits lower areal mass density (∼ 72% of Al foil), smaller thickness (40% of Al foil), but much longer cycle life (> 4 times of Al foil). Benefiting from the remarkable stability of the array structure, symmetric cells show excellent cycling stability with small voltage hysteresis (∼ 80 mV) and meanwhile there are no corrosion and pulverization problems even after cycled for 120 hours. Besides, full cells also manifest long lifespan (1,500 cycles) and increased Coulombic efficiency (100±1%).
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高影响因子
Materials
·
2020
·Vol. 13
·期 23
·5356
·
IF 3.057
Weihua Chen,Jiancheng Tang,Xinghao Lin,Yunlong Ai,Nan Ye
In the present study, high-purity ternary-phase nitride (Ti2AlN) powders were synthesized through microwave sintering using TiH2, Al, and TiN powders as raw materials. X-ray diffraction (XRD), differential scanning calorimetry (DSC), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) were adopted to characterize the as-prepared powders. It was found that the Ti2AlN powder prepared by the microwave sintering of the 1TiH2/1.15Al/1TiN mixture at 1250 °C for 30 min manifested great purity (96.68%) with uniform grain size distribution. The formation mechanism of Ti2AlN occurred in four stages. The solid-phase reaction of Ti/Al and Ti/TiN took place below the melting point of aluminum and formed Ti2Al and TiN0.5phases, which were the main intermediates in Ti2AlN formation. Therefore, the present work puts forward a favorable method for the preparation of high-purity Ti2AlN powders.Keywords:MAX-phase Ti2AlN;microwave;synthesis;high-purity powder
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PubMed
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 11
·115009
·
IF 1.929
Jialin Chen,Tao Guo,Miao Yao,Jiaxing Song,Wen Ding,Yiming Mao,Shi Li,Rui Zhu
To investigate the effect of the addition of poly (vinylidene fluoride) (PVDF) on nanothermites, Al/MoO3/PVDF energetic nanocomposites were prepared using electrospraying method. As a control group, Al/MoO3 was also designed. Then, both samples were tested by FE-SEM, XRD and TG-DSC. TG-DSC results showed that the Al/MoO3/PVDF energetic nanocomposites released more than 934.0 J g−1 with two obvious exothermic peaks. Compared with the control group of 800.7 J g−1 heat, it changed the thermal performance to some extent. There were Mo2C among the residues products after the reaction via XRD. The activation energy (Ea) was analyzed using the Kissinger method under different heating rates by DSC. The addition of PVDF reduced the Ea of the thermites. To explore the combustion performance, a preliminary experiment was designed. The Al/MoO3/PVDF energetic nanocomposites were easier to ignite and the burning was more durable, which was significant in solid propulsion and applications requiring extended combustion time.
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高影响因子
Journal of Nanomaterials
·
2020
·
IF 1.98
Hongyan Sun,Xiaodong Li,Pengfei Wu,Changgui Song,Yue Yang
RDX/aluminum composites were prepared by the spray-drying method with F2602 as a binder. The morphology and covering effect of composites were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The effect of the processing parameters on the morphology of the samples was investigated. The impact sensitivity and thermal decomposition behavior of RDX/aluminum composites were also measured and analyzed. Optimal morphology of samples was achieved when the inlet temperature, nitrogen flow rate, and suspension feed flow rates were 80°C, 473 L·h-1, and 4.5 mL·min-1, respectively. In addition, RDX/aluminum composites with the same content were prepared by a coverage-mixing method for comparative analysis. Experimental results showed that the thermal sensitivity and the impact sensitivity of RDX/aluminum composites prepared by the spray-drying method were significantly lower than those of RDX/aluminum composites prepared by the coverage-mixing method.
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高影响因子
危险品化学品经营许可证（带存储）