CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jiapeng Xu,Chaoqiang Liu,Lijuan Fu,Qingyu Liu,Seeram Ramakrishna,Wei Tang
In this work, CuO nanosheets are synthesized by one-step hydrothermal method and CuO/WS 2 heterostructures are fabricated by introducing CuO doping into WS 2 , the preparation method was employed to enhance the performance of the gas sensor. The CuO/WS 2 heterostructure nanocomposite sensor, doped with 5 % CuO, exhibited a pronounced enhancement in its response to 30 ppm of ammonia gas at ambient temperature, increasing the response value from 3.8 observed in pure WS 2 -based sensors to 4.7. Specifically, the response time of the CuO/WS 2 heterostructure-based gas sensor decreased to 180 s, whereas the WS 2 -based sensor required 350 s for NH 3 detection at room temperature. Furthermore, the CuO/WS 2 sensor demonstrated outstanding selectivity for ammonia, maintaining stability over a 90-day test with a response fluctuation of less than 5 %. The heterojunction formed by CuO and WS 2 showed superior sensitivity to NH 3 compared to pristine WS 2 , owing to a notable enhancement in the surface catalytic effect. It also displayed sensitivity to humidity, with a response value of 6.25 at a 71 % relative humidity. At last, the gas sensing and enhanced gas sensing performance mechanisms of the composites for NH 3 were elucidated. This remarkable multi-functional performance offers valuable insights for the advancement of room temperature gas sensors with diverse sensing functionalities.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Yingmeng Zhang,Luting Liu,Qingwei Deng,Wanlin Wu,Yongliang Li,Xiangzhong Ren,Peixin Zhang,Lingna Sun
Hybrid CuO-Co 3 O 4 nanosphere building blocks have been embedded between the layered nanosheets of reduced graphene oxides with a three dimensional (3D) hybrid architecture (CuO-Co 3 O 4 -RGO), which are successfully applied as enhanced anodes for lithium-ion batteries (LIBs). The CuO-Co 3 O 4 -RGO sandwiched nanostructures exhibit a reversible capacity of ~847 mA·h·g −1 after 200 cycles’ cycling at 100 mA·g −1 with a capacity retention of 79%. The CuO-Co 3 O 4 -RGO compounds show superior electrochemical properties than the comparative CuO-Co 3 O 4 , Co 3 O 4 and CuO anodes, which may be ascribed to the following reasons: the hybridizing multicomponent can probably give the complementary advantages; the mutual benefit of uniformly distributing nanospheres across the layered RGO nanosheets can avoid the agglomeration of both the RGO nanosheets and the CuO-Co 3 O 4 nanospheres; the 3D storage structure as well as the graphene wrapped composite could enhance the electrical conductivity and reduce volume expansion effect associated with the discharge-charge process.
研究领域:
材料科学
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能源存储
·
纳米技术
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 15
·12983-12990
·
IF 2.22
Yang Bingqian,Yu Yawei,Qiao Jingyuan,Yuan Lefan,Hu Xiulan
Au/CuO nanoparticles with a size range of 20–40 nm directly synthesized by solution plasma method in water have been successfully applied to the non-enzyme detection of glucose. The electrocatalytic activities of Au/CuO nanoparticles toward glucose were evaluated in an alkaline solution by cyclic voltammetry and real-time current method. Research results demonstrate that the biosensor modified by Au/CuO catalysts has a fast reaction time (< 3 s) and low detection limit (0.22 µM). There are two specific linear ranges of 0.22 µM–1 mM and 3 mM–18 mM, with the sensitivities of 172.45 µA mM −1 cm −2 and 63.66 µA mM −1 cm −2 , respectively. Moreover, it also exhibited remarkable current response, good stability (87% after 50 days), superior reproducibility, and excellent selectivity in interfering species (such as D-fructose, ascorbic acid and uric acid). Therefore, the Au/CuO nanoparticles directly synthesized by solution plasma method can be implemented to the enzyme-free detection of glucose.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Ziru Shao,Shuangfei Zhang,Yonghong Shi,Deyong Wu
For reducing the amount and fully utilizing active sites of CuO, microscale CuO coated melamine-cyanuric acid supramolecular assembly (CuO/MCSA) was developed in situ and empolyed as efficient peroxymonosulfate (PMS) activator for water decontamination. The characteristics of CuO/MCSA were characterized by XRD, FT-IR, XPS, SEM, TEM and BET. CuO/MCSA showed strong catalytic ability to activate PMS for tetracycline (TC) degradation. Under the condition of pH≈7 and PMS dosage of 0.5 mmol /L, 1 g/L CuO/MCSA including less than 3.0 wt% CuO can remove about 70% of 20 mg/L TC within 5 min. And after five consecutive cycles, the degradation rate of CuO/MCSA was still around 52.6%. PMS dosage, reaction temperature and initial pH value, co-existing anions and small molecule acids all affected the performance of CuO/MCSA/PMS system on TC degradation. According to the quenching experiments and electron paramagnetic resonance (EPR) test, 1O2 played the most important role in TC degradation in CuO/MCSA/PMS system. In addition, CuO/CSA/PMS system exhibited wide applicability, which can effectively remove TC in different water bodies (deionized water, tap water and lake water) and various pollutants (TC, methylene orange and methyl blue). Overall, this work provided an effective strategy to enhance the efficient utilization of catalyst for PMS activation.
研究领域:
环境科学
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催化材料
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水处理技术
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yan Sun,Peigen Zhang,Bo Wang,Jing Wu,Shanshan Ning,Anjian Xie,Yuhua Shen
Cu-MOF with a hollow morphology was successfully synthesized by a novel and simple coordination transformation reaction of [Cu(NH 3 ) 4 ] 2+ with benzenetricarboxylic acid (H 3 BTC) under ultrasound irradiation for the first time. Then, novel hollow porous CuO/C nanorods were prepared by calcining this Cu-MOF at low temperature (250 °C) in air. The morphology and electrochemical properties of the samples were markedly affected by the calcination temperature. As anode materials for lithium-ion batteries, the hollow porous nanorod structure and the presence of carbon greatly enhanced the electrochemical performance of the CuO/C nanocomposite. The reversible specific capacity of CuO/C was 505 mA h g −1 at a current density of 100 mA g −1 after 200 cycles, which is much higher than that of the CuO samples calcined at 300 °C and 350 °C (250.1 mA h g −1 and 192.3 mA h g −1 , respectively) in air. The CuO/C nanocomposite also exhibited a more favorable rate capability than CuO. The superior electrochemical performance makes this nanocomposite a promising anode material for LIBs.
研究领域:
材料科学
·
能源存储与转换
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 12
·126505
·
IF 4.386
Yaqi Liu,Kaidong Zhan,Zhili Shi,Wenjing Lv,Pujia Cheng,Xuecheng Ren,Fan Wu
CuO nanoarrays were synthesized by using a hydrothermal method, and TiO2 nanocrystals were deposited on the surface of CuO nanoarrays to form bulk heterostructure photoelectrodes. The current-time curve revealed that TiO2 nanocrystals can enhance the photocurrent of CuO nanoarrays, resulting from the higher charge separation efficiency and transfer rate. In addition, the effects of small biases (–0.1 and 0.1 V) on the photocurrent and photogenerated charge dynamics in the aforementioned photoelectrodes were evaluated. A small bias was found to not influence the macroscopic dynamical process during charging and discharging of the CuO photoelectrode, but it was more correlated with the microscopic dynamics. Additionally, the built-in electric field in the CuO nanoarray/TiO2 heterojunction could be affected by a small external bias, thereby influencing the charge separation and charge diffusion concentration, which, subsequently, influenced the charge diffusion length, L. In contrast, L in the pristine CuO nanoarray was not improved under a small reverse bias, because the small reverse bias could not efficiently improve the diffusion concentration owing to the lack of a built-in electric field to dissociate electron-hole pairs. These kinetic mechanisms are helpful in understanding the photoelectric conversion process in heterogeneous photoelectrodes.
研究领域:
材料科学
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物理化学
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产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 3
·133
·
IF 3.504
Ting Xu,Wen Jin,Zhenzhen Wang,Haiyan Cheng,Xinhua Huang,Xiaoyu Guo,Ye Ying,Yiping Wu,Feng Wang,Ying Wen,Haifeng Yang
A non-invasive method for detecting glucose is pursued by millions of diabetic patients to improve their personal management of blood glucose. In this work, a novel CuO nanoparticles (NPs) decorated polycaprolactone@polypyrrole fibers modified indium-tin oxide (denoted as CuO/PCL@PPy/ITO) electrode has been fabricated by electrospinning combined with the electrodeposition method for non-enzymatic detection of glucose in saliva fluid. The electrospun composite fibers exhibit high sensitivity for the glucose detection. The synergistic effect between CuO and PPy together with the unique three-dimensional net structure contributes the reliable selectivity, good test repeatability, large-scale production reproducibility in massive way, the reasonable stability and a high catalytic surface area to the sensor. Quantitative detection of glucose is determined in the linear range from 2 μM to 6 mM and the lowest detection limit is 0.8 μM. The CuO/PCL@PPy/ITO electrode shows potential for the non-invasive detection of salivary glucose.Keywords:electrospinning;polycaprolactone;polypyrrole;CuO NPs;non-enzymatic sensor;glucose in saliva
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Guoyan Zhao,Sujuan Li
In this work, visible light driven photoelectrochemical glucose sensor was developed by electrochemically deposited CuO nanoparticles (CuO NPs) on graphene (GP)-CdS nanocomposites modified electrode to achieve both the electrocatalytic and photoelectrocatalytic oxidation of glucose. Scanning electron microscopy, electrochemical impedance spectroscopy and cyclic voltammetry were used to characterize the morphology and electrochemical properties of the resultant CuO NPs/GP-CdS nanocomposites. The CV results demonstrated that modification of CuO NPs largely enhanced the photoelectrocatalytic activity of GP-CdS composites toward glucose oxidation in alkaline solution. The glucose detection sensitivity under visible light irradiation is dramatically improved compared to dark condition. Good performance was obtained for the CuO NPs/GP-CdS nanocomposites based glucose sensor. The feasibility of the present method was confirmed by good recovery results for glucose detection in human serum samples.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Lijun Ban,Haitao Li,Xin Huang,Yixuan Xu,Xia Guo,Yin Zhang,Jianghong Zhao,Yongxiang Zhao
Hollow carbon–nitrogen nanoreactors constitute a class of porous materials that have widespread application owing to their large inner cavities, low densities, core–shell interfaces, and enrichment effects. Direct carbonization of precursors is the simplest and most economical method to prepare porous carbon–nitrogen materials; however, this method requires high temperatures, thus yielding nonoxide structures. In this study, CuO–ZnO@CN (CN: carbon–nitrogen layers) is prepared using the two-step heating of zeolitic imidazolium skeleton-8 (ZIF-8) coated with CuO–ZnO precursors. During carbonization, the ZIF-8 nanoparticles are converted into carbon–nitrogen layers at high temperatures. Next, a heating process based on the autocatalytic effect of Cu can be used to etch the hollow structure prepared by the carbon–nitrogen layers. The CuO–ZnO@CN hollow composites fabricated using this method exhibit excellent catalytic properties for the ethynylation of formaldehyde. The proposed strategy can be used to develop techniques for syntheses of readily reducible carbon oxide claddings and their composites.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THERMOCHIMICA ACTA
·
2021
·
IF 3.115
Ningning Zhao,Zhong Yu,Jia Wang,Haixia Ma,Ergang Yao,Ting An,Fengqi Zhao,Xiaojiao Yu
CuO/ZIF-8 hybrid structure was obtained by adding the PVP-modified foliaceous CuO microstructures during the preparation of ZIF-8 polygon particles as a promising candidate for promoting the thermolysis process of NC. Thermoanalysis and pyrolysis kinetics based on the DSC and TG/DTG data revealed that the CuO/ZIF-8-NC decomposition had a weightlessness rate of 77.81%, heat release of 2882.5 J⋅g – 1 , the exothermic peak temperature of 471.25 K, and activation energy of 172.2 ± 16.0 kJ⋅mol – 1 , indicating that CuO/ZIF-8 has better catalytic activity than CuO and ZIF-8. The reconstructed n th -order kinetic models for NC/catalysis complexes were obtained using a modified fitting algorithm based on the results of isoconversional kinetic analysis, indicating that CuO/ZIF-8, CuO, and ZIF-8 had different catalytic effects on the thermolysis pathways of NC. This study suggests that CuO/ZIF-8 composite may have prospective application as a high potential and unique catalyst for accelerating NC pyrolysis.
研究领域:
材料科学
·
热力学
·
催化反应工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Fangzhao Pu,Chuncai Kong,Jian Lv,BoMa,Wanqi Zhang,Xiaojing Zhang,Sen Yang,Hong Jin,Zhimao Yang
Two-dimensional (2D) nanocomposites, based on graphene and transition metal oxides , hold great promise as high-performance electrode materials for next-generation lithium-ion batteries. Herein, a novel 2D CuO/RGO has been constructed by CuO ultrathin nanosheets and reduced graphene oxides (RGO) through in-situ oxidizing the Cu/RGO nanocomposite with hydrogen peroxide. CuO nanosheets with a thickness of 1.17–1.57 nm are uniformly and tightly anchored on the RGO surface without aggregation and thus the as-prepared CuO/RGO nanosheets electrode show strong interfacial coupling and fast electron transfer . Electrochemical characterizations reveal that the CuO/RGO nanocomposite electrode exhibits a remarkably enhanced cycling performance and rate performance. At the current density of 0.1C, the initial discharge capacity of 811 mAh/g has been delivered by CuO/RGO nanosheets electrode and the coulombic efficiency maintains 99.44% after 100 cycles. Moreover, the CuO/RGO nanosheets exhibit a stable specific capacity of 386 mAh/g after 200 cycles at 3C. In addition, the as-prepared CuO/RGO nanocomposite electrode exhibited excellent rate performance and lower charge transfer resistance. The current study presents a feasible route to fabricate nanosheets electrode materials for next-generation energy storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Dongmei Han,Bachirou Guene Lougou,Yong Shuai,Wei Wang,Boshu Jiang,Enkhbayar Shagdar
As heat storage and heat transfer medium , molten salt plays a vital role in achieving high heat transfer efficiency in concentrating solar power (CSP) plants. In this study, ternary chloride salts (NaCl–KCl–MgCl 2 ) is considered as the base salt and the nanocomposites doped with different mass fractions of CuO are synthesized using the solution evaporation method. The thermophysical properties of the nanocomposites, including melting temperature, phase change enthalpy , specific heat, thermal diffusivity , and thermal conductivity are investigated. The experimental results indicated the melting temperature of the nanocomposites is very close to that of the base salt. The specific heat of the nanocomposite in the liquid phase region is 10.51% higher than that of the base salt when the mass fraction of CuO was 0.7%. The addition of CuO nanoparticles significantly increase the thermal diffusivity and thermal conductivity of the base salt. The thermal diffusivity and thermal conductivity of the nanocomposites are increased by 10.95–37.23% and 15.85–39.55% compared to the base salt, respectively. The nanocomposites doped with CuO nanoparticles exhibit good application prospects and excellent thermal energy storage performance for high-temperature CSP systems.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
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