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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Nanomaterials
·
2022
·Vol. 12
·期 4
·640
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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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PubMed
高影响因子
POWDER TECHNOLOGY
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2022
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IF 5.64
Guannan Yang,Haiqi Lai,Wei Lin,Jing Tong,Zhen Peng,Jun Cao,Jiye Luo,Yu Zhang,Chengqiang Cui
In this study, we explore the structure-property relationship of sintered metal nano/microparticles from the perspective of the agglomerate size effect. Through sintering experiments and mechanical tests of Cu particle pastes with different solvents, a linear correlation between the agglomerate size in the particle paste ( L a ) and the size of large-scale cavities in the sintered structure ( L c ) is revealed, and a negative correlation between the cavity size and the shear strength of the sintered structure is discovered. Based on these results, a quantitative model is proposed to predict the overall strength of the sintered structure ( τ f ). A relationship τ f = τ c /(1 + √(2 L cmax / d )) is established, which fits the experimental results very well. The model reveals that the relative agglomerate size ( L a / d ) or relative cavity size ( L c / d ) plays a more important role than the particle size ( d ) itself in terms of defining the final sintering properties of metal nano/microparticles.
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CHINESE JOURNAL OF CATALYSIS
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2022
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IF 12.92
Linlin Wang,Xin Li,Leiduan Hao,Song Hong,Alex W. Robertson,Zhenyu Sun
To facilitate the electrochemical CO 2 reduction (ECR) to fuels and valuable chemicals, the development of active, low cost, and selective catalysts is crucial. We report a novel ECR catalyst consisting of CuO nanoparticles with sizes ranging from 1.4 to 3.3 nm anchored on Cu metal-organic framework (Cu-MOF) nanosheets obtained through a one-step facile solvothermal method. The nanocomposites provide multiple sites for efficient ambient ECR, delivering an average C 2 H 4 faradaic efficiency (FE) of ~50.0% at –1.1 V (referred to the reversible hydrogen electrode) in 0.1 mol/L aqueous KHCO 3 using a two-compartment cell, in stark contrast to a C 2 H 4 FE of 25.5% and 37.6% over individual CuO and Cu-MOF respectively, also surpassing most newly reported Cu-based materials under similar cathodic voltages. The C 2 H 4 FE remains at over 45.0% even after 10.0 h of successive polarization. Also, a ~7.0 mA cm −2 C 2 H 4 partial geometric current density and 27.7% half-cell C 2 H 4 power conversion efficiency are achieved. The good electrocatalytic performance can be attributed to the interface between CuO and Cu-MOF, with accessible metallic moieties and the unique two-dimensional structure of the Cu-MOF enhancing the adsorption and activation of CO 2 molecules. This finding offers a simple avenue to upgrading CO 2 to value-added hydrocarbons by rational design of MOF-based composites.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Wensen Liu,Hui Su,Jian Zhang,Lina Wang,Yahui Liu,Jie Liang,Zhaowu Zhu
The hydrometallurgical process for the recovery of nickel and cobalt requires a complex and expensive impurity removal process. Solvent extraction is widely used in industry for the separation, purification, and concentration of metals. However, current commercial extractants encounter some difficulties when cobalt and nickel are extracted from solutions containing a large amount of impurities such as manganese and calcium. There is an urgent need to develop new reagents for the selective extraction of Ni and Co. In this study, N-(2-ethylhexyl)-pyridine-4-carboxamide (NEHPCA) was synthesized, and the metal extraction capacity of its synergistic solvent extraction (SSX) system with dinonylnaphthalene sulfonic acid (DNNSA) and tributyl phosphate (TBP) modifier was examined. The experimental results show that the selectivity of the new SSX system has the order Cu > Ni > Co > Zn > Mn > Ca > Al ≈ Cr (III) ≈ Mg ≈ Fe (III), with excellent selectivity for nickel and cobalt. Using an organic phase composed of 0.7 M NEHPCA, 0.35 M DNNSA, and 0.2 M TBP under 1:1O/A operation, after three-stage theoretical extraction, more than 99% of nickel and cobalt can be recovered from a synthetic leaching solution of nickel laterite ore. Mechanistic studies showed that NEHPCA and water molecules participate in the internal coordination of metals, and DNNSA provided coordination anions to achieve charge balance, forming the Ni complex in this SSX system which existed most likely in the form of [Ni(NEHPCA) 2 (H 2 O) 4 ](DNNS) 2 in the organic phase.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 23
·1-10
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IF 2.8
Yuan Yulei,Zhang Minghui,Li Junjie,Liu Zhi-Quan
The application of wide bandgap semiconductor devices requires high-performance interconnect materials which have high thermal conductivity and high-temperature resistance. Among which, Cu nanoparticle paste sintering technology is regarded as an advanced alternative. However, Cu nanoparticles are easy to be oxidized, which needs an inert or vacuum atmosphere during the sintering process that restrict the practical application of Cu sintering technology. In this paper, a new type of Cu nanoparticle paste with antioxidation property was prepared by mixed commercial Cu nanoparticles (average diameter: 100 nm) treated by formic acid and reducing solvents containing 1-dodecanethiol. Based on the Cu nanoparticle paste, the pressure-assisted bonding at different bonding temperatures and times was carried out without using any protective atmosphere. A remarkable high shear strength of 55.06 MPa for Cu–Cu joints formed by sintering of Cu nanoparticle paste was achieved when sintered at 250 °C. The results of bonding experiment suggest that the proposed Cu nanoparticle paste has excellent antioxidation property and shows great application potential in high power electronic packaging.
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PACKAGING TECHNOLOGY AND SCIENCE
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2023
·Vol. 36
·期 11
·941-950
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IF 2.6
Wenjiao Ge,Han Yu,Xiaohui Wang
Natural antioxidants are beneficial additives for active packaging due to their ability to resist oxidative damage. Polymeric micelles are effective in delivering natural antioxidants in aqueous environments. However, individual encapsulation of a single antioxidant may not be sufficient to meet the needs of modern food packaging. A dual natural antioxidant-loaded micellar system (i.e., vitamin E [VE] and curcumin [Cur]) was developed to achieve combined functionality and high loading concentration. Chitosan-graft-oleic acid (CSOA) micelles were employed as carriers to co-encapsulate VE and Cur through a facile ultrasound-assisted self-assembly method. The prepared VE and Cur co-loaded micelles (CSOA/VE/Cur) exhibited a uniform spherical structure with an average particle size of 210.6 nm and a zeta potential of +29.5 mV. Moreover, the co-encapsulation of VE and Cur showed a significant enhancement in both entrapment efficiency, loading capacity and stability as compared to the individual encapsulation of either VE or Cur. In addition, the CSOA/VE/Cur micelles showed improved antioxidant activity than free VE/Cur at the same concentrations, as evidenced by 2,2-diphenyl-1-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP) assays. Moreover, the micellar materials were utilized to fabricate regenerated cellulose (RC) films with antioxidant properties, highlighting their potential as additives for antioxidant active packaging.
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International Journal of Nanomedicine
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2023
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IF 8
Yan Zhou,Zekun Zhou,Xiaojuan Wu,Zefeng Wang,Wangdan Qi,Jing Yang,Liming Qing,Juyu Tang,Le Deng
Purpose We aimed to develop an oxidative-stress-activated palladium-copper nanozyme to reduce bacterial’s heat sensitivity by down-regulating heat shock proteins to overcome the shortcomings of conventional photothermal antimicrobial therapy and achieve mild photothermal bactericidal efficacy.Methods We first synthesized palladium-copper nanozymes (PC-NPs) by hydration and used transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy to demonstrate their successful preparation. Their photothermal therapy (PTT) and chemo-dynamic therapy (CDT) activities were then determined by a series of photothermal performance tests and peroxidase-like performance tests, and the destruction of heat shock proteins by reactive oxygen species (ROS) was verified at the protein level by Western Blotting tests, providing a basis for the effective bacteria-killing by the mild-temperature photothermal treatment subsequently applied. We also validated this promising programmed and controlled antimicrobial treatment with palladium-copper nanozymes by in vivo/in vitro antimicrobial assays. A hemolysis assay, MTT cytotoxicity test and histopathological analysis were also performed to assess the in vivo safety of PC-NPs.Results In the micro-acidic environment of bacterial infection, PC-NPs showed peroxidase-like activity that broke down the H2O2 at the wound into hydroxyl radicals and down-regulated bacterial heat shock proteins. The application of PC-NPs increased bacteria’s sensitivity to subsequent photothermal treatment, enabling the elimination of bacteria via mild photothermal treatment.Conclusion The programmed synergistic catalytic enhancement of CDT and mild photothermal therapy achieves the most efficient killing of bacteria and their biofilms, which brings future thinking in the relationship between heat shock proteins and oxidative stress damage in bacteria.
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PubMed
高影响因子
MINERALS ENGINEERING
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2023
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IF 4.8
Xiaopeng Chi,Zihan Ye,Hao Wang,Wei Weng,Shuiping Zhong
The nature of copper slag flotation is unique due to the high temperature in the flotation pulp and high metallic copper content in the feed. Despite its great potential for valorizing slag, copper slag flotation remains challenging due to the deactivation of traditional dithiocarbonate (DTC) collectors (e.g., butyl xanthate) under high temperatures. DTC collectors also respond poorly to the metallic copper due to the difficulty in forming stable chemical adsorption. In this work, possible deactivation mechanisms of DTC collectors are proposed, i.e., decomposition, oxidation and thermal desorption. A novel furfuryl trithiocarbonate (FTTC) collector was designed and synthesized. Spectral characterization using FT-IR, H-NMR and ion trap MS confirmed the molecular structure of the synthesized collector and its decomposition, oxidation and polymerization products at 55 °C. The novel collector features high-temperature resistance and high metallic copper recovery, as revealed by the single mineral flotation experiments of chalcopyrite, pyrite and metallic copper at both 25 °C and 55 °C. The high collecting ability and selectivity of our collector were explained by E HOMO and E LUMO values using first-principles calculations. Our work provides guidance for the design of collectors exhibiting high-temperature resistance for copper slag flotation, aims at constituting a meaningful contribution for unlocking potential copper resources in copper slag.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Xin Liu,Peng Xu,Zhuoyu Yang,Pengfei Zhu,Baolin Hou
Zero-valent copper/air process was studied in degrading contaminants owing to in-site generation of hydrogen peroxide and reactive oxygen species, while its oxidation efficacy was restrained by the dismutation of cuprous ion. In this study, when the dosages of paracetamol, ferric ion, chloride ion and zero-valent copper were respectively 10 μM, 40 μM, 2 mM and 0.2 g/L at pH 3.0, the paracetamol elimination was greatly enhanced and increased from 9.2% to 76.5% within 30 min with adding both ferric ion and chloride ion in the zero-valent copper/air process. Hydroxyl radical and reactive chlorine species were identified as the dominant reactive oxygen species, and the contribution rates of hydroxyl radical and reactive chlorine species to eliminating paracetamol were respectively 68.2% and 28.9%. In the proposed system, zero-valent copper and cuprous ion expedited the ferric/ferrous circulation, conducing to the production of reactive oxygen species. Moreover, chloride ion coupled with cuprous ion producing the cuprous chloride complexes, and chloride ion contributed to the comproportionation between zero-valent copper with cupric ion to form cuprous chloride, receding the dismutation of cuprous ion and contributing to the formation of hydrogen peroxide and reactive oxygen species. When zero-valent copper reused for three times in the proposed system, the degradation of paracetamol reached 62%. After we increased the end pH to > 7.0 and leaching, the total copper of reaction solution was under 0.85 mg/L and the acute toxicity had no insignificant increase for discharge water. The study provided a new idea to enhance zero-valent copper/air system for the purification of pollutants.
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ACS Sustainable Chemistry & Engineering
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2023
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IF 8.4
Kang Lei,Haiming Huang,Xu Jia Liu,Weiliang Wang,Kai Guo,Ren Kui Zheng,Han Li
The eco-friendly thermoelectric material SnTe has recently gained immense attention due to its excellent thermoelectric properties and potential. However, its thermoelectric properties are limited by the inherent high carrier concentration (low Seebeck coefficient) and high thermal conductivity. Herein, we further introduce rare-earth element Y on top of the conventional Cu alloying to more effectively modulate its microstructure and thermal transport properties. The experimental results reveal that Y doping gives rise to band convergence, endowing Sn1–xYxTe-5%Cu2Te with an increased power factor of ∼22.14 μW cm–1 K–2. Meanwhile, the introduced abundant Y/Y2Te3 multiscale composite nanostructures in the matrix greatly enhance phonon scattering, resulting in an ultra-low lattice thermal conductivity of ∼0.43 W m–1 K–1. Consequently, these combined effects resulted in a peak ZT value of 1.27 at 823 K in Sn0.97Y0.03Te-5%Cu2Te. An enhancement of nearly 217% is achieved compared to pristine SnTe, which greatly improves the thermoelectric properties of SnTe-based materials.
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Journal of Experimental Nanoscience
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2021
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IF 3.075
Ying Zhang,Yangmei Li,Qiang Tan,Song Hong,Zhenyu Sun
Electrochemical CO2 reduction (ECR) powered by renewable electricity is reckoned to provide an effective strategy to alleviate environmental issues and energy crisis, enabling a potential carbon neutral economy. To boost the ECR to fuels and value-added chemicals, the design of highly active and selective catalysts is important. In this study, we demonstrate facile ultrasonication-facilitated synthesis of two-dimensional copper terephthalate for efficient ECR. High faradaic efficiencies (FEs) of up to 72.9% for hydrocarbons are achieved at a mild overpotential in an H-type cell. In particular, the FE for ethylene (C2H4) formation approaches 50.0% at an applied potential of −1.1 V (vs. the reversible hydrogen electrode), outperforming commercial Cu, Cu2O, CuO, Cu(OH)2 and many recently reported Cu-based materials. The C2H4 partial geometric current density is as high as ∼6.0 mA·cm−2. This work offers a simple avenue to developing advanced electrocatalysts for converting CO2 into high-value hydrocarbons.
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