SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2023
·
IF 6.9
Jinjie Mo,Ziye Ling,Zhengguo Zhang,Xiaoming Fang
In this paper, we investigate a metal composite prepared using a one-step pressing method, where Al–Si alloy acts as the phase change materials (PCMs) and Al 2 O 3 /AlN serve as the structural support materials. The alloy formation and PCM composite preparation are synthesized in a single step. The study aims to characterize the microstructure, thermodynamic, and thermal properties of the composite material. To assess the heat storage properties of the prepared composite PCMs at temperatures higher than 600 °C, a high-temperature test system is established using a high-frequency induction heater. Additionally, we explore how to improve the issue of liquid leakage under high-temperature conditions. The results demonstrate that Al 2 O 3 and AlN (ceramic materials) exhibit excellent chemical compatibility with Al–Si composite PCMs. After sintering, the ceramic materials form a strong bond with Al–Si, effectively retaining the liquid phase of Al–Si alloy within the composite material. Consequently, the Al–Si composite PCMs do not exhibit high-temperature liquid leakage under elevated conditions. Both Al 2 O 3 /Al–Si and AlN/Al–Si composites possess favorable high temperature heat storage properties. The phase change enthalpy of Al 2 O 3 /Al–Si composite reaches 400 kJ/kg, with a thermal conductivity of 36 W/(m·K). Similarly, the AlN/Al–Si composite achieves a phase change enthalpy of 404 kJ/kg and a thermal conductivity of 43 W/(m·K). Both composites fulfill the requirements for high-temperature heat storage applications.
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Ubaid Khan,Bowen Gao,Ling Bing Kong,Zhong Chen,Wenxiu Que
The electrochemical properties of carbides and nitrides dominated two dimensional MXenes can be effectively engineered for a wide variety of applications. Herein, we report a hydrothermal Alkali etching process to prepare Ti 3 C 2 T x @Al-NaOH (T x = -OH, -O) MXene without fluorine from Sodium hydroxide (NaOH) and MAX solution. The T i3 C 2 T x @Al-NaOH sample etched for 15 h in NaOH solution exhibits optimal electrochemical properties. Also, the T i3 C 2 T x @Al-NaOH samples, which have NaOH concentrations of 22.5, 25, 30, 35 and 40 M, respectively, show higher rates of charge-discharge and pseudocapacitive effect in 1 M sulfuric acid electrolyte solution, while the corresponding specific capacity values are 378, 445, 565, 365 and 176 Cg −1 , respectively. Meanwhile, their retention rates are still retained at 94 %, 119 %, 150 %, 113 % and 29 %, after continuous cycling of about 8000 times. It is demonstrated that the Ti 3 C 2 T X @Al-NaOH (30 M) for 15 h shows great potential as a candidate electrode for supercapacitors and other energy storage devices, since its capacitance value surpasses (by ∼465 %) to that of the multilayer Ti 3 C 2 T x MXene prepared via normal hydrofluoric acid etching. As a consequence, our Alkali-assisted hydrothermal reaction treatment is a highly advantageous process to realize fine-tune of surface chemistry.
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Journal of Materials Research and Technology-JMR&T
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2023
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IF 6.4
Yang Yu,Baojing Zhang,Xiaoping Cai,Zhejian Cao,Farid Akhtar,Xinyang Jiao,Xueding Chai,Peizhong Feng
Ni–Al–Cr alloys in the β phase (B2–NiAl) region exhibit remarkable stability and mechanical property. Through thermal explosion (TE) reaction, Ni–Al–Cr intermetallic compounds with high porosity can be obtained. In this study, the focus lies on analyzing the macroscopic morphology, microstructure, phase distribution, TE behaviour, and the mechanical property of porous Ni–Al–Cr in the β phase region. Following the TE reaction, the Al-rich sintered product demonstrates a uniform phase composition and high porosity, reaching 44.39%. The vigorous TE reaction promotes the formation of interconnected pores, while the high porosity structure compromises the mechanical properties of the sample. Conversely, the Al-poor sintered product, due to a moderate TE reaction and low porosity structure, maintains its complete morphology and exhibits excellent compression resistance (yield stress reaching 538 MPa). This study offers valuable insights for the fabrication of porous Ni–Al–Cr materials with exceptional structure and performance.
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Polymers
·
2023
·Vol. 15
·期 14
·3055
·
IF 5
Ying Su,Xiaoming Zhao,Yue Han
The infrared camouflage textile materials with soft and wear-resistant properties can effectively reduce the possibility of soldiers and military equipment being exposed to infrared detectors. In this paper, the infrared camouflage textile composites with intelligent temperature adjustment ability were prepared by different methods, using phase change microcapsule as the main raw material and high polymer polyurethane as the matrix, combining the two factors of temperature control and emissivity reduction. It was tested by differential scanning calorimeter, temperature change tester, infrared emissivity tester, and infrared imager. The results show that the temperature regulation effect of textile materials finished by coating method is better than dip rolling method, the temperature regulation ability and presentation effect are the best when the microcapsule content is 27%. When the bottom layer of infrared camouflage textile composite is 27% phase change microcapsule and the surface layer is 20% copper powder, its infrared emissivity in the band of 2–22 μm is 0.656, and the rate of heating and cooling is obviously slowed down. It has excellent heat storage and temperature regulation function, which can reduce the skin surface temperature by more than 6 °C and effectively reduce the infrared radiation. This study can provide reference for laboratory preparation and industrial production of infrared camouflage composite material. The infrared camouflage textile composite prepared are expected to be used in the field of military textiles.Keywords:phase change microcapsules;infrared camouflage;emissivity;intelligent temperature regulation;textile composites
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
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IF 5.7
Lingjiao Zhan,Fuqin Zhang,Qiang Liu,Juan Wang,Chaozhong Wu,Shuwei Yao,Yunzhu Ma,Wensheng Liu
Duplex oxide ceramic fibers have excellent high temperature properties. However, controlling the microstructure of duplex oxide ceramic fibers is difficult and complexed. In this work, the effect of silica sols affecting the interaction of precursor sol-gel particles on the high-temperature phase transition and microstructure of alumina-mullite fibers was investigated. The results show that the silica sol affects the particle interactions and distribution in the mixed sol. Alumina-mullite fibers prepared from non-homogeneous precursor sols generated α-Al 2 O 3 at 1400 °C, while fibers prepared from homogeneous precursor sols required higher temperatures. In addition, mullite (3Al 2 O 3 :2SiO 2 ) with an orthogonal structure is more likely to be generated in the non-homogeneous Al 2 O 3 -SiO 2 precursor sol. The prepared alumina-mullite fibers have a tensile strength of up to 1.68 GPa. Finally, the mechanism of the influence of silica-sol properties on the final organization of the alumina-mullite fiber was further discussed.
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COMBUSTION EXPLOSION AND SHOCK WAVES
·
2023
·Vol. 59
·期 3
·367-374
·
IF 1.2
Wang D.-W.,Li C.,Zhang L.,Zhu C.-G.
Abstract To develop a green primary explosive, we prepare an Al@KIO 4 nano-thermite using spray co-precipitation and then mix it with pentaerythritol tetranitrate (PETN) to form a PETN/Al@KIO 4 composite as a primary explosive. The thermite structure is characterized using X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy, which indicates that the thermite is about 200 nm and well distributed. The combustion performance is investigated using high-speed photography and confined combustion experiments. The results show that the detonation time of PETN/Al@KIO 4 composites is 60 \(\mu\) s earlier than that of pure PETN, indicating that the thermite accelerates the process of the deflagration-to-detonation transition of PETN. The detonation performance of the composites is investigated, and it is verified that PETN/Al@KIO 4 can initiate RDX successfully and be used as a primary explosive. Moreover, the safety performance and long-term storage performance of the composite are evaluated, which shows that the PETN/Al@KIO 4 composite performance is steady and the initiation effect does not change after 20 years of storage.
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International Journal of Electrochemical Science
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2023
·
IF 1.5
Yong Zheng,Qian Wang,Yongjun Zheng,Zhen Wang,Dayong Tian
Electrolytic recovery of pure aluminum is a conventional method for the recycling of waste aluminum alloys, which is very important to economic development and environmental protection. However, the conventional electrolytic recovery process suffers from several inherent problems, which restricts the further development of this technology. In this study, an air- and moisture-stable 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ionic liquid was applied in the dissolution of aluminum chloride. The upper phase of the resulting mixture was used as a low-temperature electrolyte in the electrolytic recovery of pure aluminum. The results of cyclic voltammetry and linear sweep voltammetry showed that aluminum could be electrodeposited from the electrolyte and that the main impurity elements of the aluminum alloy could also be stripped off by the electrolytic method. Based on these measurements, the electrolytic recovery process was conducted at 0.2−0.6 V and 303.2−373.2 K. Scanning electron microscope micrographs showed that smooth, compact and well-adherent deposits were obtained at 0.4 V from 303.2 to 323.2 K. In this situation, the preferred crystallographic orientation of these deposits was the (200) plane. Meanwhile, the mass content of aluminum in all deposits was higher than 99.6% according to the purity characterization. This study may be useful for the further application of ionic liquids in the low-temperature recycling of waste aluminum alloys.
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JOM
·
2023
·Vol. 75
·期 9
·3632-3642
·
IF 2.6
Fei Zitong,Xing Yusen,Dong Peng,Meng Qi,Zhang Yingjie
The traditional direct regeneration of cathode material of spent lithium-ion batteries is encountering the challenge of high energy consumption. Here, an oxidative hydrothermal solution has been developed for direct regeneration of spent LiCoO 2 materials in low-temperature operation. The regenerated cathode material displays a better structural transformation with single-crystal particle morphology. More Co 2+ in spent LiCoO 2 materials are successfully transformed to Co 3+ in regenerated cathode materials. The initial discharge capacity of regenerated cathode materials reaches 153.46 mAh/g with a capacity retention rate of 95.02% after 200 cycles, which are both significantly higher than that of 39.83% in regenerated materials obtained by the traditional hydrothermal regeneration process. This oxidative hydrothermal solution can provide the electrochemical driving force to accelerate the repair of defects of spent cathode materials and break the limit of kinetics under low-temperature conditions. The low-temperature hydrothermal regeneration process is available to guide efficient and economically reasonable recycling of spent cathode materials.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Yaofeng Mao,Jie Chen,Jian Wang,Wei Cao,Jun Wang,Fude Nie
Fluorinated reactive materials as new energetic materials are widely studied because of their high combustion heat and the ability to release large amounts of gaseous products. In order to further improve combustion reaction and the energy release efficiency, structural processing strategy is usually adopted to construct unique microstructures for fluorinated reactive materials. In this work, it is found that fluorinated graphene (FG) and nano-aluminum (nAl) can be rapidly assembled by the intercalation-like method to form multilayer nanostructured energetic materials with particle mosaic. Based on this, the energy output performance of these multilayer nanostructured energetic materials can be effectively regulated by changing the ratio of FG to nAl. The shortest laser ignition delay time (8 ms) and the longest burning time (56 ms) can be achieved for the multilayer nanostructured energetic material with proper FG/Al ratio, while the burning rate of the sample spline can reach 14.83 cm/s. In addition, the reaction process of multilayer nanostructured FG/Al energetic materials depends upon oxygen content that participates in the reaction in different atmospheres, leading to the different pressure output performance. This study provides a promising strategy for the further application of fluorinated reactive materials in the field of energetic materials.
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Surfaces and Interfaces
·
2023
·
IF 6.2
Hongyuan Cui,Lin Yang,Xueqi Fu,Guodong Li,Shu Xing,Xiao-Feng Wang
The simultaneous detection of multiple diabetes markers is important for the diagnosis and typing of diabetes because of the complex causes of diabetes. Two-dimensional titanium carbide (MXene), an emerging material, has great potential for biomedical sensing, in addition to its electrical applications. In this study, a fluorescence resonance energy transfer (FRET) aptasensor with high sensitivity and specificity was constructed using monolayer Ti 3 C 2 MXene for the simultaneous detection of insulin and visceral adipose tissue-derived serotonin (vaspin). Fluorescein-labeled insulin binding aptamers (IBAs) and Cy7-labeled vaspin-binding aptamers (VBAs) were attached to Ti 3 C 2 , and their fluorescence was effectively quenched by FRET between the fluorescein and Ti 3 C 2 . Insulin and vaspin were preferentially bound to IBA and VBA for a higher affinity. This process led to the subsequent shedding of fluorescein from Ti 3 C 2 , resulting in fluorescence recovery. The high fluorescence quenching efficiency and broad wavelength absorption of Ti 3 C 2 MXene enabled the quenching of two different, wide spectrum fluorescence at two different wavelengths, thus enabling the simultaneous detection of both insulin and vaspin. The aptasensor was highly sensitive, with a low detection limit of 36 pM for insulin and 45 pM for vaspin. Importantly, this Ti 3 C 2 -based aptasensor can precisely detect insulin and vaspin in human serum and diagnose a specific type of diabetes and identify its cause to facilitate subsequent treatment. The above results indicate that the Ti 3 C 2 -based aptasensor has promising applications in the clinical diagnosis and typing of diabetes mellitus.
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Small Methods
·
2023
·
IF 12.4
Wending Pan,Yulong Zhang,Kee Wah Leong,Yingguang Zhang,Jianjun Mao,Yifei Wang,Xiaolong Zhao,Shijing Luo,D.Y.C Leung
In recent years, there have been significant advancements in Al-ion battery development, resulting in high voltage and capacity. Traditionally, only carbon-based materials with layered structures and strong bonding capabilities can deliver superior performance. However, most other materials exhibited low discharge voltages of 1.4 V, especially in aqueous Al-ion battery systems lacking anion intercalation. Thus, the development of high-voltage cathode materials has become crucial. This study introduces 2D MoS 2 as a high-performance cathode for aqueous Al-ion batteries. The material's interlayer structure enables the intercalation of AlCl 4 − anions, resulting in high-voltage intercalation. The resulting battery achieved a high voltage of 1.8 V with a capacity of 750 mAh g −1 , contributing to a high energy density of 890 Wh kg −1 and an impressive retention rate of ≈100% after 200 cycles. This research not only sheds light on the high-voltage anion-intercalation mechanism of MoS 2 but also paves the way for the further development of advanced cathode materials in the field of Al-ion batteries. By demonstrating the potential of using 2D MoS 2 as a cathode material, this finding can lead to the development of more efficient and innovative energy storage technologies, ultimately contributing to a sustainable and green energy future.
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COMBUSTION AND FLAME
·
2023
·
IF 4.4
Yongjin Chen,Hui Ren,Xinzhou Wu,Haoyue Xin,Qingjie Jiao
To design and prepare multifunctional metastable intermixed composites (MICs) with excellent properties, the enhanced “litchi-like” core-shell structure Al/Ti/CuO MICs were prepared by high-energy ball milling (Al/Ti/CuO-B). The morphology, structure, composition, thermal reactivity, energy release and combustion performance of the prepared MICs were investigated by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and synchronous thermal analysis (DSC-TG), closed system constant volume combustion experiment, open system CO 2 laser ignition experiment and high-energy laser-induced ablation experiment. This study reveals that, the obtained Al/Ti/CuO-B composites have a “litchi-like” core-shell structure, the components are evenly distributed and closely contacted. The exothermic reaction of Al/Ti/CuO-B should be divided into two stages. Due to the introduction of Ti and the special structure of litchi, Al/Ti/CuO-B has superior reactivity ( E a =178.15 kJ/mol), energy release ( Q = 6443 J/g, P max =164.90KPa), shock wave propagation ( v = 1028.33 m/s) and combustion performance than Al/Ti/CuO-P (simple physical mixing). The thrown Al/Ti/CuO composite particles will undergo secondary micro-reactions during the combustion, and a continuous multi-point “micro-explosion” phenomenon will occur, then self-sustainable combustion can be achieved through multi-level energy superposition release, which will enhance its reaction, combustion and energy release. Al/Ti/CuO-B undergoes an ultrafast reaction to generate plasma under high-energy laser induction, which expands and pushes the surrounding air to form a shock wave. The application of Al/Ti/CuO-B shows that the density, heat of detonation, shock wave overpressure, fireball diameter and temperature of composite structural explosive charge containing Al/Ti/CuO ring are all significantly improved.
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