JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Xiaozhen Wang,Yishi Su,Qiubao Ouyang,Di Zhang
With the rapid development of the miniaturization and high-integration of electronic devices, conventional thermal conductive materials cannot ensure the safety and reliability of the high-power devices in working environments. It is urgent to develop thermal management materials with excellent thermophysical and mechanical properties . In this work, the tungsten-coated graphite flakes (GFs(W)) were prepared by the immersion reduction, and the GFs(W) reinforced copper matrix composites (GFs(W)/Cu composites) were prepared by the vacuum hot-pressing sintering. Based on the microstructure and surface analysis, the W coating obtained at 900 °C and 200 g/L AMT appears the excellent surface structure and interfacial adhesion, which transfer the interfacial bonding from mechanical combination to mechanical-metallurgical synergy between the GFs and Cu. In addition, the volume fraction of W coating has a threshold to improve properties of the GFs(W)/Cu composites, in which the GFs(6 W)/Cu composites show the outstanding comprehensive performance: the in-plane thermal conductivity and flexural strength are 879.0 ± 10.0 Wm −1 K −1 and 166.9 ± 3.4 MPa respectively, which are improved by 22.3% and 356.0%, and the lowest coefficient of thermal expansion is 4.3 ± 0.5 ppmK −1 . To sum up, it provides an effective way to develop novel structural and functional integrated graphite/copper composites for thermal management.
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Nanomaterials
·
2022
·Vol. 12
·期 4
·640
·
IF 5.719
Lin Bo,Fujin Li,Yangbo Hou,Min Zuo,Degang Zhao
Forming co-alloying solid solutions has long been considered as an effective strategy for improving thermoelectric performance. Herein, the dense Cu2−x(MnFeNi)xSe (x= 0–0.09) with intrinsically low thermal conductivity was prepared by a melting-ball milling-hot pressing process. The influences of nanostructure and compositional gradient on the microstructure and thermoelectric properties of Cu2Se were evaluated. It was found that the thermal conductivity decreased from 1.54 Wm−1K−1to 0.64 Wm−1K−1at 300 K via the phonon scattering mechanisms caused by atomic disorder and nano defects. The maximumzTvalue for the Cu1.91(MnFeNi)0.09Se sample was 1.08 at 750 K, which was about 27% higher than that of a pristine sample.Keywords:thermoelectric material;nanostructured;interfacial engineering;multi-scale scattering centers
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高影响因子
MATERIALS CHARACTERIZATION
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2022
·
IF 4.537
Z. Sun,X.X. Zhu,H.Z. Chen,L.X. Zhang
To address the excessive formation of brittle compounds when brazing TiAl alloys, a TiZrHfCoNiCu high-entropy brazed filler was developed to realize the brazing of TiAl/Ti 2 AlNb couples. The TiAl/Ti 2 AlNb brazed joints can be divided into 4 zones, i.e., 2 diffusion zones at the TiAl/braze filler, Ti 2 AlNb/braze filler interfaces and 2 zones divided inside the brazed seam. α 2 + γ-TiAl were the main reaction products formed at the TiAl/braze filler interface and α 2 + Ti 0.5 Al 0.12 Nb 0.38 were the main reaction products at the Ti 2 AlNb/braze filler interface. Effects of brazing temperatures on the interfacial microstructure and mechanical properties of the TiAl/Ti 2 AlNb brazed joints were investigated. When brazing at 1100°C/15 min, the highest shear strength can reach 157 MPa (room temperature), and 123 MPa (650°C) respectively. The relationship between the microstructure and the corresponding mechanical response were discussed in detail. This research can offer new insights on developing desirable brazing filler when joining TiAl and TiAl based alloys.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2022
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IF 7.305
Nan Sheng,Yunfei Ge,Yunqi Guo,Chunyu Zhu,Zhonghao Rao
This study reports the successful fabrication of Cu@Al 2 O 3 macro-encapsulated metallic PCMs for high-temperature thermal storage over 1000 °C. Cu powders are employed as raw material which are spherulitized to core balls in millimeter-size, and subsequently the core balls are cladded with Al 2 O 3 ceramic shells. After the low-temperature pre-sintering and subsequent high-temperature sintering treatment, the Cu@Al 2 O 3 macrocapsules which contain gaps between the shells and cores are successfully prepared. The core balls are consisted of Cu powders which are not densified but are porous, offering buffer spaces to accommodate the thermal volume expansion during high-temperature sintering and melting of Cu. As a comparison, Cu@Al 2 O 3 macrocapsules prepared by directly coating the commercial solid Cu balls are leaky. Thermal analysis indicates that the metallic core PCM has a melting temperature of 1063 °C and a latent heat of around 210 J/g. The macrocapsules are also highly durable as confirmed by the melting-solidification cycling test. These results demonstrate that the Cu@Al 2 O 3 macrocapsules are applicable as high-temperature heat storage media, which can find useable applications in advanced high-temperature thermal energy storage systems .
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Kaixin Liu,Shuquan Huang,Yangxin Jin,Lan Ma,Wen-Xiong Wang,Jason Chun-Ho Lam
The continuous growth of e-waste necessitates an efficient method to recover their metal contents to improve their recycling rate. The successful recovery of the metallic component from Waste Electrical and Electronic Equipment (WEEE) can generate great economic benefits to incentivize the industrial recycling effort. In this study, we report the use of slurry electrolysis (SE) in pH-neutral ethylene glycol (EG) electrolyte to extract and recover the metallic component from waste printed circuit broad (WPCB) powder. The system operates at room temperature and atmospheric pressure, and the electrolyte can be recycled multiple times with no signs of chemical degradation . The EG electrolyte system can oxidize the metallic component without triggering anodic gas evolution, which allowed us to incorporate a reticulated vitreous carbon (RVC) foam anode to maximize the capture and oxidation of the metal content. The system demonstrated up to 99.1% Faraday efficiency for the cathodic metal deposition and could recover Cu from the WPCB powder in a selective manner of 59.7% in the presence of 12 other metals. The SE reaction system was also scalable and displayed no compromises on the Cu recovery selectivity . With the ability to leach and recover metallic content from WPCB in a mild and chemically benign condition, the SE system displayed much promise to be adapted for industrial-scale metal recovery from WPCB.
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高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 13
·2200034
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IF 6.389
Qian Gao,Wangyang Zhang,Chaopeng Zhao,Weishan Yan,Suqin Han,Yanyan Li,Qiao Liu,Xi Li,Duo Liu
Robust and high-performance electrochemical electrodes for non-enzymatic glucose sensing are in constant demand. Herein, a hierarchical nonenzymatic glucose sensing electrode on boron-doped diamond (BDD) is fabricated using high-speed laser engraving and pulsed electrodeposition of Cu nanostructures. The obtained electrode contains a densely packed Cu nanoflake (CuNF) array periodically decorated on the laser-engraved BDD. The hierarchical nanoarchitecture combines the d-band catalytic activity of the CuNFs with the low capacitive background current of the engraved BDD substrate, thus enabling fast, precise, and high signal-to-noise ratio detection of trace glucose. Outstanding performances that combine high sensitivity of 2119 µA cm –2 m m –1 , ultrafast response time of <1 s, and low detection limit of 0.2 × 10 −6 m are experimentally demonstrated. Furthermore, the electrode exhibits excellent cyclicality and anti-interference ability, and maintains 90% of its initial responsivity after being stored in air for >8 months, indicating great stability for practical usage.
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Chinese Physics B
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2022
·Vol. 31
·期 7
·078102
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IF 1.652
Zhangyu Gu,Yisong Fan,Yixing Ye,Yunyu Cai,Jun Liu,Shouliang Wu,Pengfei Li,Junhua Hu,Changhao Liang,Yao Ma
Non-stoichiometric copper selenide (Cu2 – xSe, x = 0.18 ∼ 0.25) nanomaterials have attracted extensive attentions due to their excellent thermoelectric, optoelectronic and photocatalytic performances. However, efficient production of Cu2 – xSe nanoparticles (NPs) through a green and convenient way is still hindered by the inevitable non-environmentally friendly operations in common chemical synthesis. Herein, we initially reveal the coexistence of seleninic acid content and elemental selenium (Se) NPs in pulsed laser-generated Se colloidal solution. Consequently, we put forward firstly a closed-cycle reaction mode for totally green production of Cu1.8Se NPs to exclude traditional requirements of high temperature and toxic precursors by using Se colloidal solution. In such closed-cycle reaction, seleninic acid works as the initiator to oxidize copper sheet to release cuprous ions which can catalyze the disproportion of Se NPs to form {{\rm{SeO}}}_{3}^{2-} and Se2– ions and further produce Cu2 – xSe NPs, and the by-product {{\rm{SeO}}}_{3}^{2-} ions promote subsequent formation of cuprous from the excessive Cu sheet. In experiments, the adequate copper (Cu) sheet was simply dipped into such Se colloidal solution at 70 °C, and then the stream of Cu1.8Se NPs could be produced until the exhaustion of selenium source. The conversion rate of Se element reaches to more than 75% when the size of Se NPs in weakly acidic colloidal solution is limited between 1 nm and 50 nm. The laser irradiation duration shows negative correlation with the size of Se NPs and unobvious impact to the pH of the solution which both are essential to the high yield of Cu1.8Se NPs. Before Cu sheet is exhausted, Se colloidal solution can be successively added without influences to the product quality and the Se conversion rate. Such green methodology positively showcases a brand-new and potential strategy for mass production of Cu2 – xSe nanomaterials.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Xin Liu,Peng Xu,Zhuoyu Yang,Pengfei Zhu,Lei Wang,Shiqi Xie
Cu 0 coupled with O 2 was used to degrade contaminant due to in-site generation and catalysis of H 2 O 2 , while the low reactivity and active dismutation reaction of Cu + refrained the performance at acidic condition. In this study, the removal rate of 4-acetamidophenol increased from 27 % to 83.4 % with Fe 3+ spiked into the Cu 0 system within 60 min •OH was the primary reactive species in the Fe 3+ /Cu 0 system. In the Fe 3+ /Cu 0 system, Cu 0 was corroded to form Cu + by H + and O 2 , and then Cu + interacted with O 2 generating H 2 O 2 , and meanwhile Fe 3+ was reduced to Fe 2+ by Cu + and Cu 0 ; Consequently, Cu + and Fe 2+ induced H 2 O 2 to produce •OH, but Fe 2+ was easier to catalyze H 2 O 2 than Cu + at acidic pH. Except for fulvic acid , common water matrix including sulfate ion, phosphate ion, chloride ion and nitrate ion had no inhibition effect on the degradation of 4-acetamidophenol in the Fe 3+ /Cu 0 system. over 62 % of 4-acetamidophenol in tap water , Hou-lake water and well water was greatly oxidized by the Fe 3+ /Cu 0 system. Furthermore, the amount of total dissolved copper decreased to 0.895 mg/L by the method of alkali precipitation in the Fe 3+ /Cu 0 system. The study provided a theoretical direction to the Fe 3+ -enhanced Cu 0 system for purifying wastewater.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Huizhong Chi,Wenbiao Jin,Jianqiao Zhang,Yibin Xiu,Tao Xu
In recent years, there has been growing interest in the mechanism (radical or nonradical) of persulfate activation processes. In this study, the enhancement of naproxen (NPX) degradation in a Cu 0 /peroxymonosulfate (PMS) system by complexing reagents was investigated. Surprisingly, neocuproine (NCP) alters the nature of reactive species in the Cu 0 /PMS system. A high-valent copper species, Cu(III)-NCP, was found to dominate NPX degradation rather than radicals under acid conditions for the first time. Moreover, systematically designed experiments revealed that the Cu(III)-NCP complex was a strong selective oxidant that reacted with organics through a single electron transfer pathway. Meanwhile, the degradation efficiency of NPX was highly dependent on the solution pH and dosage of Cu 0 and NCP, but was irrelevant to the concentration of NPX. Additionally, the enhancement of NCP on other copper based PMS activation systems (i.e., Cu 2+ /HA/PMS and Cu 0 /HA/PMS systems) was investigated. Considering that the released copper can be removed by a simple precipitation method to meet the effluent standards, the new complex-enhanced Cu 0 /PMS system provided a new method to enhance the degradation efficiencies of pollutants by a copper-catalyzed Fenton-like system.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Bareera Raza,Yang Zhang,Ming Xu,Jun Yang,Yanna NuLi,Jiulin Wang
Rechargeable Zinc batteries as energy storage and conversion devices are attracting wide attention due to their merits of intrinsic safety, abundant resources, and inexpensive components. However, the thermodynamic instability of Zn metal anode in the aqueous environment leads to limited cycle life, poor rechargeability, and restricted large-scale employment of Zinc batteries. Herein, we investigate the electrochemical and morphological behavior of Zn anode in an organic aprotic amide, N’N -dimethylacetamide (DMAC) solvent-based electrolyte, which demonstrates highly reversible Zn deposition (CE of ∼ 99.80%), improved anodic stability (∼2.4 V vs. Zn/Zn 2+ ), and a high current capability of 15.0 mA cm −2 /15.0 mAh cm −2 . Practically, a remarkable performance with high-capacity retention and high CE (≥99%) is attained for Zn||MnO 2 full cell, which is a positive step toward the development of rechargeable Zinc batteries.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 19
·15894-15903
·
IF 2.779
Hu Zeqing,Xu Huihong,Lin Yangjian,Liu Yu,Xu Junsheng,Li Zhou,Song Jiming
Currently, Cu 2 GeS 3 has been obtained through solid-state reaction. However, the pure phase Cu 2 GeS 3 synthesized still faces challenges due to the low boiling point of the sulfur element. Herein, we have prepared pristine Cu 2 GeS 3 by a two-step method. Firstly, the pure phase GeS 2 was synthesized by solvothermal method and then used the freshly as-synthesized GeS 2 as raw material to react with copper powder to fabricate pure phase Cu 2 GeS 3 . Further, the thermoelectric properties of Cu 2 GeS 3 crystal have been explored. At room temperature, the electric resistance value measured by multimeter was ~ 2634 Ω for intrinsic Cu 2 GeS 3 crystal, which exceeded the instrument (electrical conductivity/Seebeck coefficient) test range of 0–2000 Ω, so there is no relevant report in the thermoelectric field about Cu 2 GeS 3 crystal. In order to improve its conductivity, Cu 2 GeS 3 crystal is alloyed with a small amount of Te powder to obtainable Cu 2 GeS 3− x Te x samples, which have obvious thermoelectric properties. By adjusting the content of Te, finally, the electrical conductivity of the Cu 3 GeS 2.6 Te 0.4 sample reached 364.20 S m −1 and the figure-of-merit ZT max value of ~ 0.12 were obtained at 816 K.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xin Liu,Peng Xu,Shiqi Xie,Lei Wang,Zhuoyu Yang,Pengfei Zhu,Jingwei Ma,Qiulai He,John C. Crittenden
Zero-valent copper particles (Cu 0 ) used to degrade pollutant due to its in-site generation and activation of hydrogen peroxide (H 2 O 2 ), while the disproportionation of Cu + limited the efficacy. In this study, spiking chloride ion (Cl − ) into zero-valent copper (Cu 0 ) system (Cl − /Cu 0 system) enhanced greatly acetaminophen degradation. The addition of Cl − not only reduced the dismutation reaction of Cu + , but also helped the comproportionation reaction of Cu 0 and Cu 2+ , leading to much generation of Cu + and H 2 O 2 . Hydroxyl radical ( OH) and reactive chlorine species were identified as the dominant reactive oxidants in the Cl − /Cu 0 system with its contribution ratio of degrading acetaminophen being respectively 73.4 % and 23.8 %. In the Cl − /Cu 0 system, Cu + was released by H + corrosion from Cu 0 , and then Cu + coupled with Cl − forming Cu-Cl complexes; Meanwhile, the reaction of O 2 and the species of Cu + (e. g. Cu-Cl complexes and Cu + ) produced H 2 O 2 and, then the species of Cu + catalyzed H 2 O 2 to form OH; Thereinto, partial OH was shifted by Cl − to reactive chlorine species. Except for fulvic acid , coexisting substrates such as sulphate, nitrate and phosphate ions had no obvious inhibition impact on oxidizing acetaminophen in the Cl − /Cu 0 system. Furthermore, the Cl − /Cu 0 system presented a good removal rate of acetaminophen in three actual water samples. Moreover, three kinds of dyes and painkillers was removed over 78 % in the Cl − /Cu 0 system. The residual total dissolved copper was under II-level of environmental quality standards for surface water in China by alkali precipitation and filtration after reaction. Therefore, the study provided a new idea to enhance Cu 0 for the purification of pollutants.
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