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
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 11
·8141-8150
·
IF 2.993
Zhou Qianqian,Li Ting-Ting,Xu Wei,Zhu Hong-Lin,Zheng Yue-Qing
Integration of water oxidation catalysts on conductive support without polymer binder is an appealing strategy to improve the catalytic activity for electrochemical oxygen evolution reaction. Herein, the hierarchical CuO dandelion-like materials assembled from numerous ultrathin nanosheets are directly grown on Cu foil to produce a 3D oxygen evolution anode (CuO NSDs/CF). As a result of its integrated configuration and high electrocatalytic active sites, the anode exhibits superior electrocatalytic water oxidation activity in 1.0 M NaOH solution, associated with a small overpotential of 370 mV at 10 mA cm −2 and a low Tafel slope of 41 mV dec −1 . Furthermore, the anode can maintain a relatively stable current density at 1.65 V versus RHE for at least 24 h, and a high Faradaic efficiency of 98% is also achieved.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Applied Nanoscience
·
2019
·Vol. 9
·期 8
·1991-2000
·
IF 3.198
Liu Zhi,Cao Rui,Wei Anfang,Zhao Jianghui,He Jihuan
Membrane fouling and poor flexibility plague membrane technology for further application in water treatment. Herein, we introduce a hierarchical superflexible/superhydrophilic poly (vinylidene fluoride-co-hexa-fluoropropylene) (PVDF-HFP)/CuO-nanosheet membrane, which is capable of separating Polystyrene (PS) microspheres (diameter large than 300 nm) with high separation efficiency (higher than 99.89%). Moreover, the resulting membrane maintained 98.10% water flux after 60 min, suggesting excellent anti-fouling property. The anti-fouling property is contributed by the membrane superhydrophilicity, a result of the extreme roughness of CuO-nanosheet and the hydrophilic nature of CuO. Furthermore, the membrane processes outstanding flexibility due to the PVDF-HFP nanofiber backbone, which widens its applicability in practical industrial employment. Therefore, such a membrane with anti-fouling, high separation efficiency, super flexibility, as well as acceptable water flux (2360 ± 50 Lm − 2 h − 1 , 0.3 bar) and good mechanical properties (stress at break 6.65 MPa and elongation at break 67.35%), makes the membrane a good candidate for practical water microfiltration.
研究领域:
材料科学
·
环境工程
·
水资源处理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jianghui Zhao,Wanlong Li,Yiling Shi,Xianhong Zheng,Quan Feng,Siew Chun Low,Soon Huat Tan,Zhi Liu
The rational design of material structures can be an effective approach to enhance the performance of solar-driven clean water production. In this study, a hollow structural nanofibrous membrane was developed by mimicking the hollow structure of polar bear hair using coaxial electrospinning. The shell layer consisted of carbon nanoparticles (C NPs) decorated CuO nanosheets (C@CuO), that exhibited photothermal conversion capacity. Meanwhile, the core layer containing hydrophilic polyvinylpyrrolidone (PVP) was eliminated to generate the hollow structure. The C NPs enhanced the membrane’s light absorption to increase thermal energy harvesting, while the CuO nanosheets improved the membrane’s wettability enhancing the water supply. Furthermore, the hollow structure limited air convection, prevented heat conduction, and minimized heat radiation, enabling heat localization to be achieved inside the membrane to suppress heat loss during evaporation. For 3.5 wt% saline water and actual dye wastewater, the C@CuO nanofibrous membrane achieved high evaporation rates of 1.36 kg·m −2 ·h −1 and 1.31 kg·m −2 ·h −1 , respectively, under 1 sun illumination. Moreover, even after continuous 6-h evaporation tests, the evaporation rate of the C@CuO membrane remained virtually unchanged, highlighting its long-term stability with regard to salt resistance in real-world applications. Additionally, the remarkable flexibility of the C@CuO membrane offers convenience during operation and guarantees dimensional stability when it is subjected to external stresses. These discoveries should inspire subsequent research on developing delicate architectural materials and exploring their potential applications in various fields, including energy generation, clean water production, and thermal insulation.
研究领域:
材料科学
·
环境科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS TECHNOLOGY
·
2017
·
IF 1.155
Mouping Fan,Haiying Yu,Yu Chen
CuO nanosheets prepared by a hydrothermal treatment were tested as anode material for sodium-ion batteries (SIBs) with aid of different binders, namely carboxymethyl cellulose (CMC) and poly (vinylidene) fluoride (PVDF). Compared with electrode containing PVDF, CuO nanosheets electrode with CMC binder showed significantly more satisfactory electrochemical performance. Specifically, CuO nanosheets electrodes with CMC binder delivered a high reversible capacity of 627.2 mAh g−1 at 50 mA g−1, and 73.4% of initial capacity value at a high current density of 2000 mA g−1 after 100 cycles. According to the morphological characterisation after cycling, compared with PVDF, CMC binder better preserved the structural integrity of the anode and accommodated the volume variation of CuO nanosheets during charge/discharge cycling, thus leading to a more satisfactory electrochemical performance. Furthermore, to explore the practical application of CuO nanosheets anode, a SIB full cell consisting of CuO nanosheets anode and Na3V2(PO4)3 cathode was assembled and tested.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yuyin Dai,Qiuyu Lin,Qi Wang,Hongguang Zhao,Yinghua Li
Copper oxides (CuO), by virtue of their exceptional electrical conductivity, benign environmental profile, and economic viability, have emerged as indispensable constituents in the design and development of binder-free electrodes for advanced supercapacitor systems. The ongoing quest for the synthesis of CuO nanomaterials through gentle yet economically feasible methodologies held considerable promise for broadening their applicability within the domain of energy storage devices. In this investigation, a novel architectural innovation was achieved through the integration of carbon nanotubes (CNTs) within the framework of an in-situ electrooxidation process, culminating in the formation of a distinctive CuO-CNT nanorod configuration. Subsequent to this fabrication, the electrode material was subjected to an extensive cyclic voltammetry (CV) activation for 2000 cycles, which precipitated a profound morphological evolution. This process resulted in the emergence of 2D hierarchical nanosheet arrays enveloping 1D nanorods, a configuration herein designated as CuO-CNT-2000. This meticulously engineered lamellar structure conferred upon the material an extraordinary specific surface area, quantified at 219.6 m 2 g⁻ 1 , and an impressive specific capacitance of 709.1 F g⁻ 1 . Moreover, the asymmetric supercapacitor (ASC) assembled utilizing this advanced material exhibited a remarkable energy density, measured at 38.09 Wh kg⁻ 1 . Notably, even after enduring 60,000 charge-discharge cycles, the device demonstrated a retention of 82.36 % of its initial energy density, coupled with a Coulombic efficiency of 99.43 %, thus attesting to its superior electrochemical stability and longevity. The efficacy of the CV activation technique in facilitating significant morphological refinement, augmenting the specific surface area, and enhancing the electrochemical performance of the material suggests a broad applicability of this method to a diverse array of other electrode materials, potentially revolutionizing the design and fabrication of next-generation energy storage systems.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2023
·Vol. 15
·期 4
·e202201413
·
IF 4.5
Dandan Zhao,Shaoyang Zhang,Tianyu Guo,Qiang Zhao,Jianping Du,Jinping Li
Graphical Carbon dioxide reduction : The rectangular nanoflakes with crystalline/amorphous phase structures that the square nanoblocks are confined in amorphous nanoflakes efficiently enhance the electrocatalytic conversion of CO 2 to ethylene. The electrocatalytic reduction of CO 2 to high value-added chemicals is one of the effective technologies to achieve the goal of carbon neutralization. However, highly selective production of hydrocarbon via electrochemical conversion of CO 2 still has great challenges. Herein, a unique CuO phase composition is constructed that consists of rectangular nanoflakes possessing crystalline/amorphous structures by the facile strategy. Crystalline CuO square nanoblocks are confined in amorphous nanoflakes and form crystalline/amorphous hybrid phase. The results of electrocatalytic CO 2 reduction demonstrate that this crystalline/amorphous CuO material exhibits superior CO 2 conversion ability with ethylene Faradaic efficiency of 58.3 % at −1.08 V vs. RHE, which is ascribed to nanoflake structures and fast electron transfer on the crystalline/amorphous interfaces because of superior conductivity of amorphous CuO. The present research provides an effective route to reconstruct novel crystalline/amorphous interfaces of CuO for catalysis applications.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2019
·
IF 3.556
Zhendong Li,Yanmei Sun,Wenli Huang,Cheng Xue,Yan Zhu,Qianwen Wang,Dongfang Liu
Magnetic CuO nanosheet (Mag-CuO), as a cheap, stable, efficient and easily separated peroxymonosulfate (PMS) activator, was prepared by a simple one-step precipitation method for the removal of organic compounds from salt-containing wastewater. The experiments showed that the removal efficiencies of various organic pollutants including Acid Orange 7, Methylene Blue , Rhodamine B and atrazine in a high-salinity system (0.2 mol/L Na 2 SO 4 ) with the Mag-CuO/PMS process were 95.81%, 74.57%, 100% and 100%, respectively. Meanwhile, Mag-CuO still maintained excellent catalytic activity in other salt systems including one or more salt components (NaCl, NaNO 3 , Na 2 HPO 4 , NaHCO 3 ). A radical-quenching study and electron paramagnetic resonance analysis confirmed that singlet oxygen ( 1 O 2 ) was the dominant reactive oxygen species for the oxidation of organic pollutants in high-salinity systems, which is less susceptible to hindrance by background constituents in wastewater than radicals ( • OH or SO 4 •− ). The surface hydroxylation of the catalyst and catalytic redox cycle including Cu and Fe are responsible for the generation of 1 O 2 . The developed Mag-CuO catalyst shows good application prospects for the removal of organic pollutants from saline wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Acta Metallurgica Sinica-English Letters
·
2020
·Vol. 34
·期 1
·85-97
·
IF 2.09
Liu Tao,Chen Yuejiao,Chen Libao
Developing excellent pseudocapacitive electrodes with long cycle, high areal capacity and large rate has been challenged. 3D printing is an additive manufacture technique that has been explored to construct microelectrodes of arbitrary geometries for high-energy–density supercapacitors. In comparison with conventional electrodes with uncontrollable geometries and architectures, 3D-printed electrodes possess unique advantage in geometrical shape, mechanical properties, surface area, especially in ion transport and charge transfer. Thus, a desirable 3D electrode with ordered porous structures can be elaborately designed by 3D printing technology for improving electrochemical capacitance and rate capability. In this work, a designed, monolithic and ordered multi-porous 3D Cu conductive skeleton was manufactured through 3D direct ink writing technique and coated with CuO nanosheet arrays by an in situ electro-oxidation treatment. Benefiting from the highly ordered multi-porous nature, the 3D-structured skeleton can effectively enlarge the surface area, enhance the penetration of electrolyte and facilitate fast electron and ion transport. As a result, the 3D-printed Cu deposited with electro-oxidation-generated CuO (3DP Cu@CuO) electrodes demonstrates an ultrahigh areal capacitance of 1.690 F cm −2 (38.79 F cm −3 ) at a large current density of 30 mA cm −2 (688.59 mA cm −3 ), excellent lifespan of 88.20% capacitance retention after 10,000 cycles at 30 mA cm −2 and superior rate capability (94.31% retention, 2-30 mA cm −2 ). This design concept of 3D printing multi-porous current collector with hierarchical active materials provides a novel way to build high-performance 3D microelectrodes.
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
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2017
·
IF 2.625
Shuang Liang,Yuming Zhou,Wenting Wu,Yiwei Zhang,Zhilan Cai,Jie Pan
After applying for many years, antibiotics, such as chlortetracycline (CTC), have been widely detected in aquatic environment. The persistence and toxicity effect of them ungently calling for better solution. In this study, CuO nanosheet-liked structure has been successfully synthesized through a C 3 N 4 templating method with the presence of benzyl alcohol and sodium citrate by assembling small CuO nanoparticles onto the surface of C 3 N 4 nanosheet . Because of the C 3 N 4 -liked structure, narrowing band gap, enhanced visible light absorption and decreased recombination rate of photogenerated electron-hole pairs, the as-prepared CuO nanosheet-liked structure exhibits an enhanced visible-light photocatalytic activity in the degradation of CTC. Furthermore, Pt nanoparticles with a dimension around 10 nm have been loaded onto the surface of CuO nanosheet-liked structure to enhance the visible-light photoactivity of the photocatalyst. For the first time, the CuO-based photocatalyst can be applied in the photocatalytic degradation of CTC and displays an improved performance while comparing to TiO 2 -based photocatalysts. In particular, nearly 50% concentration of CTC in the solution can be degraded with the presence of Pt/CuO-NS-2 in 120 min. With the synergy effect between H 2 O 2 and Pt/CuO-NS-2, the degradation efficiency and ability of CTC has been further improved. Around 80% of CTC in the solution was degraded in 60 min.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 5
·期 12
·9130-9137
·
IF 3.708
Jiahuan Lei,Yu Liu,Xinyu Wang,Pan Hu,Xinsheng Peng
Au nanoparticles/mesoporous CuO nanosheets were successfully synthesized by the assembly of negatively charged AuCl4−1 and positively charged CuO nanosheets using sodium citrate and thermal reduction, respectively. The structure and morphology were characterized in detail. Both the loading amount of Au nanoparticles and the performance were controlled by the reduction process. The resulting Au/CuO NSs exhibited good catalytic activity for CO oxidation and good non-enzymatic sensitivity for glucose.
研究领域:
材料科学
·
化学
·
生物传感
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2019
·
IF 3.782
Xu Lina,Li Jiao,Sun Haibin,Guo Xue,Xu Jiakun,Zhang Hua,Zhang Xiaojiao
Cu2O/CuO nanosheets in-situ grown on Cu-Carbon cloths (Cu-CCs), namely Cu2O/CuO@Cu-CCs, are constructed by a simple strategy with electroless copper plating, chemical etching, and thermal dehydration. The as-prepared material is directly used as binder-free electrodes for supercapacitors (SCs). CCs coated with Cu, as the current collector, can effectively promote the charge collection and electron transfer, while the hierarchical Cu2O/CuO nanosheets provide massive active sites for fast faradic reactions. The composite electrode exhibits high specific capacitance [1.71 F cm−2, equivalent to 835.2 F g−1, at the current density of 10 mA cm−2 (3.57 A g−1)]. The asymmetric supercapacitor device using Cu2O/CuO@Cu-CCs as the positive electrode and activated carbon as the negative electrode, achieves a superior energy density up to 60.26 Wh kg−1 at a power density of 299.73 W kg−1 and an excellent long-term cycling stability (9.65% loss of its initial capacitance after 5,000 cycles). The excellent electrochemical performance is mainly ascribed to the unique hierarchical structure of Cu2O/CuO@Cu-CCs, making it attractive as a potential electrode material for high performance SCs.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）