JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Mengmeng Cui,Xingjie Lu,Taofang Zeng,Olim Ruzimuradov,Dong Fang,Caiju Li,Fengxian Li,Yichun Liu,Rui Bao,Jianhong Yi
Copper vanadate materials have a higher gravimetric capacity and energy density than those of the traditional vanadium oxide or vanadate electrodes because of the multistep oxidation-reduction reactions. This work presents the synthesis of nano-structured copper vanadates using ion-exchange reaction of sodium vanadate nanowire arrays in an aqueous solution, containing copper acetate or copper nitrate. The morphology, crystal structure, composition and lithium-storage performance of the materials are measured and characterized thoroughly. Due to the dissolution effect of the acetate anion on the sodium vanadate nanowire arrays, copper vanadate spheres composed of nanosheets are produced. By contrast, after the ion-exchange reaction in the copper nitrate solution, the sample maintains its original nanowire arrays structure. The copper vanadate nanowire arrays synthesized in copper nitrate solution for 48 h followed with calcination at 300 °C for 2 h exhibit a remarkably high storage capacity of up to 997.76 mAh g −1 in 3–0.01 V versus Li/Li + , thus showing a great potential for application in lithium-ion batteries.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Electronic Materials Letters
·
2015
·Vol. 11
·期 4
·702-706
·
IF 1.98
Han Wen-Song
In this manuscript, the third-generation hyperbranched polyester was synthesized with 2, 2-dimethylol propionic acid as AB 2 monomer and pentaerythrite as core molecule by using step by step polymerization process at first. Then, the Cu-Ag particles were prepared by co-reduction of silver nitrate and copper nitrate with ascorbic acid in the aqueous solution using hyperbranched polyester as template. Finally, the Cu-Ag@Ag particles were prepared by coating silver on the surface of Cu-Ag particles by reduction of silver nitrate. The synthesized hyperbranched polyester and Cu-Ag@Ag particles were characterized by Fourier transform infrared (FT-IR) spectroscopy, UV-vis spectra, x-ray diffraction, Laser light scattering, thermogravimetric analysis (TGA) and SEM. UV-vis spectra results showed that the Cu-Ag@Ag particles had a strong absorption band at around 420 nm. Laser light scattering and SEM studies confirmed that the most frequent particle sizes of Cu-Ag@Ag particles were 1.2 um. TGA results indicated that the Cu-Ag@Ag particles had good thermal stability.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
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IF 4.086
Xi Zheng,Kaiqiang Wu,Jinli Mao,Xinxin Jiang,Lianyi Shao,Xiaoting Lin,Peng Li,Miao Shui,Jie Shu
By using multi-wall carbon nanotube (MWCNT), a well-dispersed composite of Cu(NO 3 ) 2 · xH 2 O/MWCNT (2.5
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Biomaterials Science
·
2025
·
IF 5.7
Zhenxing Han,Ting Wang,Ruotong Ma,Mariem Elmalkig,Siyu Cheng,Chuang Li,Dandan Li,Zhenglian Xue,Guangjun Nie
Noncovalent chitosan (CS)/hyaluronic acid (HA) hydrogel has been characterized by favorable cytocompatibility, biodegradability and non-toxicity. It bears a close resemblance to human skin and holds promising potential applications in medical engineering. Nevertheless, the CS/HA hydrogels have yet to achieve widespread application due to the relatively weak toughness. In this study, salts were utilized to regulate the mechanical properties of CS/HA hydrogel. The results indicated that copper nitrate was the most effective regulator, which transformed intramolecular hydrogen bonds and electrostatic interactions into intermolecular hydrogen bonds and cation chelations, respectively. The regular domains in the hydrogel were reduced while the crosslink was strengthened. Consequently, the toughness of the hydrogel was increased to 7.8 MJ/m3, 1253-fold that of covalent CS/HA hydrogel. The salt effect was replicated in the other two hydrogels, attesting to its generality. Hence, salt regulation proves to be an effective way to enhance mechanical properties of hydrogel. In addition, the copper nitrate-regulated hydrogel exhibited favorable drug delievring behavior and photothermal response. Under the exposure of near-infrared light, the release rate and amount of the drug loaded in the hydrogel were increased by 40% and 39% respectively within 20 minutes, manifesting a remarkable potential for application as a drug carrier.
研究领域:
材料科学
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生物医学工程
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高分子科学
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药剂学
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产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry Letters
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2022
·
IF 6.888
Wei Huang,Xinyue Xiang,Luyue Jin,Yi He
Here, we report on using dark-field microscopy (DFM) as a simple and low-cost imaging platform to visually resolve the kinetics of single cuprous oxide (Cu2O) microparticles for NO2 removal in a real-time manner. Unexpectedly, we find that the redox reaction between Cu2O microparticles and NO2 is oscillating with the reaction time. Specifically, the oscillatory behavior of single Cu2O microparticles for NO2 reduction shows a large particle-to-particle variability, which is also dependent upon the NO2 pressure and Cu2O facets. A combined DFM imaging, spectroscopic, scanning electron microscopy, and density functional theory study uncovers that Cu2O is gradually transformed to copper nitrate hydroxide [Cu2(NO3)(OH)3], and this oscillatory reaction is attributed to the cyclic formation and structural collapse of Cu2(NO3)(OH)3. The present findings open an alternative avenue for probing structure–performance relationships, which are anticipated to benefit the creation of functional materials for air purification.
研究领域:
环境化学
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材料科学
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表面科学
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纳米技术
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大气污染控制
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DOI
高影响因子
RSC Advances
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2019
·Vol. 9
·期 52
·30439-30447
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IF 3.049
Yongsheng Wang,Zhenzhen Zhao,Yunlu Zhao,Xiaolin Lan,Weixiang Xu,Li Chen,Dongjie Guo,Zhengkang Duan
The sintering resistance of supported Cu nanoparticle (NP) catalysts is crucial to their practical application in the dehydrogenation of diethanolamine (DEA). In this paper, co-precipitation, hydrothermal synthesis, and sol–gel condensation are used to form a new support material through chemical bonding between graphene oxide and ZrO2. The composite carriers prepared by the three methods are mixed with copper nitrate and ground using a ball mill. A series of Cu/ZrO2-reduced graphene oxide (RGO) composites were prepared by calcination under nitrogen at 450 °C for 3 h and hydrogen reduction at 250 °C for 4 h. The conversion of DEA to iminodiacetic acid (IDA) reached 96% with the Cu/ZrO2-RGO catalyst prepared by hydrothermal synthesis. The conversion rate of DEA is more than 80% following the reuse of the CZG-2 catalyst for twelve cycles. The various physicochemical characterization techniques show that the Cu/ZrO2-RGO layered and wrinkled nanostructures can improve catalytic stability and suppress the sintering of the supported Cu NPs during the catalytic dehydrogenation of diethanolamine. A synergistic effect between the RGO and the Cu nanoparticles is observed. The Cu nanoparticles with RGO have a better dispersibility, and a new nano-environment is created, which is the key to improving the efficiency of diethanolamine dehydrogenation. These new Cu/ZrO2-RGO catalysts show increased durability compared to commercially produced Cu/ZrO2 catalysts and show promise for practical applications involving diethanolamine dehydrogenation.
研究领域:
材料科学
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化学工程
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催化
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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