ChemElectroChem
·
2017
·Vol. 5
·期 4
·630-636
·
IF 4.136
Ke Wang,Ying Huang,Yade Zhu,Meng Yu,Mingyue Wang
Graphical Cubic composites : Cu 2 O/Cu 2 S-rGO composites are synthesized by using a facile growth process. Benefiting from the rGO coating and the “breathable” structure formed by Cu 2 O and Cu 2 S, the resulting material delivers an initial discharge capacity of 878.6 mAh g 1 , stable cycling stability of 417.35 mAh g 1 after 100 cycles, retaining 73.5 % of its initial charge capacity, demonstrating a significantly improved cycling reversibility and structural stability. Cubic Cu 2 O/Cu 2 S particles with a novel truncated edge structure anchoring on reduced graphene oxide (Cu 2 O/Cu 2 S-rGO composites) were synthesized by using a facile growth process. Compared to simple Cu 2 O cubes and bare Cu 2 O/Cu 2 S particles, the Cu 2 O/Cu 2 S-rGO composite shows a competitive capacity and stable cyclic stability as anode materials for sodium-ion batteries (SIBs). At a low current density of 60 mA g −1 , the Cu 2 O/Cu 2 S-rGO composite delivers an initial discharge capacity of 878.6 mAh g −1 , stable cycling stability of 417.35 mAh g −1 after 100 cycles, retaining 73.5 % of its initial charge capacity, demonstrating a significantly improved cycling reversibility and structural stability. The enhanced electrochemical performance for Cu 2 O/Cu x S-rGO composites might be ascribed to the rGO coating and the “breathable” structure formed by Cu 2 O and Cu 2 S. The outer coated rGO nanosheets could maintain the structural integrity and electrical conductivity, and the main active component (Cu 2 O and Cu 2 S) is present in the form of small clusters, providing “breathable” aggregates capable of effective sequential shrinkage and expansion.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 149
·期 1
·180-189
·
IF 2.911
Hu Yin,Chen Wei,Ba Mingwei,Song Weiguo
Solvent-free selective hydrogenation of α -pinene to synthesize cis -pinane with high efficiency has always been a challenge in the catalytic research. The key to achieve this goal is the development of the highly efficient and recyclable catalysts. Cubic NaNbO 3 crystals were functionalized by (γ-aminopropyl)-triethoxysilane (APTS) and decorated with Ru species by a simple solvothermal approach combined with a sol-gel method. And this compound was applied to the catalytic hydrogenation of α -pinene. The crystal phase, chemical structure and surface components of the catalysts were analyzed by X-ray diffraction, field emission transmission electron microscope, X-ray photoelectron spectroscopy, Fourier transform infrared spectra and thermogravimetric analysis. APTS-functionalization of the catalyst surface contributes to the highly dispersed and uniform Ru species with small particle size, leading to the outstanding conversion of α -pinene and selectivity of cis -pinane over NaNbO 3 /APTS/Ru catalyst. The performance of this catalyst is better than that of other similar catalysts, and is comparable to that of commercial Ru/C. The possible mechanisms of the formation of catalyst and the hydrogenation reaction were proposed and discussed. The decrease of catalytic performance after seven cycles should be ascribed to the decomposition and leaching of APTS during the hydrogenation process. The work provides an alternative strategy to design a kind of reusable catalyst with highly efficient hydrogenation performance based on the surface functionalization. Graphical Abstract
研究领域:
催化
·
材料科学
·
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2015
·
IF 2.561
Yanhua Zhang,Fei Chen,Rong Tu,Qiang Shen,Xulong Zhang,Lianmeng Zhang
The Li + concentration in nominal Li 7 Al 0.25 La 3 Zr 2 O 12 (LALZO) solid electrolyte are believed to pose significant effect on its electrical conductivity . The affecting mechanism of Li + concentration on microstructure evolution and its relationship with Li ionic conductivity is investigated. Results show that Li + occupancy in octahedral site (LiO 6 ) increases with the increase of Li + concentration and Li + arrangement becomes a certain degree ordered in tetragonal site (LiO 4 ) at 6.72 moles Li + concentration. The structural evolution indicates that higher Li + concentration in LiO 6 as well as disordered Li + arrangement in LiO 4 will enhance the grain conductivity which infers the best Li + concentration of 6.35 moles. The tested electrical property show the highest grain ionic conductivity of 1.35 × 10 − 3 S cm − 1 at Li + concentration of 6.35 moles which is in good agreement with prediction made from the structural evolution. It is concluded that Li + concentration affects Li ionic conductivity via changing Li + distribution in the grain.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Lian Xia,Jia Zheng,Jian Su,Hongli Yang,Zhengmin Xie,Yue Tang,Yuangen Wu
Ethyl carbamate (EC) is a small compound produced and stored during fermentation processes from ethanol, urea, citrulline, and carbamoyl phosphate. EC is commonly found in fermented foods and alcoholic beverages. Prolonged exposure to EC can cause nervous system diseases and liver damage in human beings. EC lacks stable physicochemical properties, and the presence of numerous interfering substances in alcoholic beverages poses challenges for its detection. Herein, it is found that EC1-34 aptamer bound to EC can enhance the laccase-like activity of cubic Ag 2 O nanoparticles (NPs). Subsequently, Ag 2 O NPs are wrapped with EC1-34 aptamer to prepare recognition probes, which are immobilized on a carrier membrane. Thus, a portable paper-based sheet for EC detection in Chinese Baijiu is designed. The visual detection limit of the developed paper-based sheet for EC is 10 μg⋅L −1 , and shows an outstanding linear relationship within the range of 10–200 μg⋅L −1 . Moreover, this colorimetric paper-based sheet has a good practicality in various Chinese Baijiu samples. It is believed that such paper-based sheet can facilitate portable inspection for EC in Baijiu, and may also become a beneficial tool for monitoring EC molecules in other fermented foods.
研究领域:
食品科学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INFRARED PHYSICS & TECHNOLOGY
·
2025
·
IF 3.4
Yan Hao,Wenxia Wu,Zhaoyue Wang,Hao Ren,Ming Deng,Jie Wang,Yixin Zeng,Ao Li,Shoulei Xu,Wen Deng
Under 980 nm excitation, Ho 3+ in Ho/Yb co-doped materials can emit light spanning the infrared to green spectral regions through down-conversion and multiphoton up-conversion processes. The multi-wavelength infrared emissions from Yb/Ho co-doped yttria-stabilized zirconia (YSZ) enable fast wavelength hopping, making it highly valuable for secure laser communication systems. However, achieving efficient and intense multi-wavelength emission remains challenging. In this work, high-quality YSZ, YSZ:Yb 3 Ho 0.1 , Lutetia-stabilized zirconia (LuSZ) and LuSZ:Yb 3 Ho 0.1 single crystals were grown by the optical floating zone method. A first-time comparative study reveals distinct photoluminescence characteristics between YSZ:Yb 3 Ho 0.1 and LuSZ:Yb 3 Ho 0.1 crystals under 980 nm excitation. Both systems show emission peaks at 2450, 2100, 1845, 1230, 1050, 650, and 538 nm from the down-conversion and up-conversion photoluminescence (DCPL and UCPL). Notably, LuSZ:Yb 3 Ho 0.1 exhibits stronger UCPL peaks at 650 and 538 nm, attributed to its lower phonon energy. In contrast, YSZ: Yb 3 Ho 0.1 shows higher DCPL intensities infrared peaks at 2450, 2100, 1845, 1230, and 1050 nm, benefiting from its higher transmittance and phonon energy. The unique strong multi-wavelength infrared emission of YSZ:Yb 3 Ho 0.1 crystal enables rapid wavelength switching, highlighting its potential for secure laser communication.
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Shiyu Wu,Yufu Yi,Shengliang Liao,Hongyan Si,Yuling Yang,Guorong Fan,Peng Wang
We described the comprehensive synthesis, characterization, and catalytic performance of a novel type of the ordered cubic Ia3̅d supermicroporous silicas by using tetraethyl orthosilicate as a silicon source and a hydroxyl-functionalized quaternary ammonium salt as a template under alkali conditions. The effects of various reaction conditions on the pore structure and morphology of the silica materials were thoroughly investigated. Our results showed that under a wide range of reaction conditions, supermicroporous silicas with a highly ordered cubic Ia3̅d structure can be produced with a large BET specific surface area of 1741 m2/g, high pore volume of 0.91 cm3/g, concentrated pore size at 19.1 Å, and crystalline morphology. After Al doping, the obtained aluminosilicates preserved a highly ordered cubic supermicroporous structure. By using the H-form aluminosilicates as catalysts, we selectively dimerized β-pinene. The catalysts exhibited an excellent catalytic activity for β-pinene dimerization with a conversion yield up to 100%. Compared with conventional mesoporous H-form Al-MCM-48 catalysts, the prepared supermicroporous catalysts exhibited superior catalytic performance due to their excellent shape-selective properties, producing the β-pinene dimer in a yield up to 72.4% with dimer/oligomer ratios in the range of 7.5–10.1. This study featured a detailed preparation and characterization of supermicroporous silica with novel microstructures and showed its utility in catalytic dimerization.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Chunlai Liu,Wei Wang,Na Wang,Zelong Liu,Peihang Shen,Jianglei Hu,Fengwei Shi
Wastewater containing heavy metal ions, such as Cu 2+ , that are released into the environment will cause irreparable damage to the nature and human health of living. It is, therefore, absolutely crucial to remove these toxic ions from water. Herein, this paper utilizes the cyano group as a functional reagent to prepare carboxyl-functionalized SBA16 for adsorbing Cu 2+ in water. In this paper, 2-cyanoethyltriethoxysilane is employed as a functionalizing reagent to prepare carboxyl-functionalized SBA16 through a one-pot method. The prepared material was characterized using various techniques, such as WXRD, TEM, FT-IR, and XPS. The results indicated that the introduction of the functionalizing reagent did not disrupt the original cage-like cubic mesoporous structure (Im3m symmetry) of SBA16. Crucial adsorption factors, namely pH, adsorbent dosage, Cu 2+ initial concentration, and contact time, affecting the removal of Cu 2+ were monitored and the optimum adsorption conditions were determined. Isotherm and kinetic investigations were conducted and a non-linear fitting method of experimental data was used to obtain isotherm and kinetic parameters. Maximum adsorption capacity reaches 181.3 mg g −1 was achieved in 60 min at pH = 3. Adsorption kinetics and adsorption isotherm followed the pseudo-second-order (R 2 = 0.999) and Langmuir (R 2 = 0.999) models, respectively. This suggests that the adsorption process primarily involves chemisorption and monolayer coverage. Thermodynamic parameters showed the spontaneous and endothermic nature of the adsorption process. After 5 cycles, the adsorbent still maintains a good adsorption capacity for Cu 2+ . This suggests promising applications for the adsorbent in treating wastewater containing Cu 2+ .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2018
·
IF 2.746
Jiamin Liu,Xiaoyun Ma,Shijuan Zhang,Ting Wu,Hongzhan Liu,Mingyue Xia,Jinmao You
A cationic gemini surfactant templated magnetic cubic mesoporous silica Fe 3 O 4 @14-3-14-MCM-48 nanocomposite was successfully synthesized and utilized in the magnetic dispersive solid phase extraction (MDSPE) of nine endocrine-disrupting compounds (EDCs) from the migrants of food contact materials by high performance liquid chromatography with diode array detection (HPLC–DAD). Fe 3 O 4 @14-3-14-MCM-48 can interact with EDCs through electrostatic interactions , hydrophobic effect , and hydrogen bonding effect. It showed excellent adsorption performance for EDCs with short alkyl chain phenols, which showed higher hydrophilicity and less retained by normal mesoporous silica with single chain surfactant as template. The parameters affecting MDSPE efficiency were optimized, and the optimum extraction conditions were adsorbent amount, 20 mg; elution solvent, methanol/acetonitrile mixture at 50/50 (v/v); NaCl concentration, 30 g/L; sample pH 5.0. Under the optimized condition, the limits of detection and limits of quantification were in the range of 1.0–2.5 and 2.9–7.5 ng/mL, respectively. Good linearity was observed in the range of 10–200.0 ng/mL with correlation coefficients of >0.997 and the recoveries were in the range of 92.6–102.3%. The developed method was successfully applied to the detection of phenolic EDCs migrants from food contact materials.
研究领域:
分析化学
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）