Journal of Materiomics
·
2015
·
IF 0
Junwei Fu,Shaowen Cao,Jiaguo Yu
Photocatalytic hydrogen generation is one of the most promising solutions to convert solar power into green chemical energy. In this work, a multi-component TiO 2 –Ag–Cu 2 O composite was obtained through simple impregnation-calcination of Cu 2 O and subsequent photodeposition of Ag onto electrospun TiO 2 nanotubes. The resulting TiO 2 –Ag–Cu 2 O photocatalyst exhibits excellent photocatalytic H 2 evolution activity due to the synergetic effect of Ag and Cu 2 O on electrospun TiO 2 nanotubes. A dual Z-scheme charge transfer pathway for photocatalytic reactions over TiO 2 –Ag–Cu 2 O composite was proposed and discussed. This work provides a prototype for designing Z-scheme photocatalyst with Ag as an electron mediator.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaoqi Mao,Yongjin Zou,Fen Xu,Lixian Sun,Hailiang Chu,Huanzhi Zhang,Jian Zhang,Cuili Xiang
The three-dimensional (3D) architecture of electrode materials with excellent stability and electrochemical activity is extremely desirable for high-performance supercapacitors. In this study, we develop a facile method for fabricating 3D self-supporting Ti3C2 with MoS2 and Cu2O nanocrystal composites for supercapacitor applications. MoS2 was incorporated in Ti3C2 using a hydrothermal method, and Cu2O was embedded in two-dimensional nanosheets by in situ chemical reduction. The resulting composite electrode showed a synergistic effect between the components. Ti3C2 served as a conductive additive to connect MoS2 nanosheets and facilitate charge transfer. MoS2 acted as an active spacer to increase the interlayer space of Ti3C2 and protect Ti3C2 from oxidation. Cu2O effectively prevented the collapse of the lamellar structure of Ti3C2–MoS2. Consequently, the optimized composite exhibited an excellent specific capacitance of 1459 F g–1 at a current density of 1 A g–1. Further, by assembling an all-solid-state flexible supercapacitor with activated carbon, a high energy density of 60.5 W h kg–1 was achieved at a power density of 103 W kg–1. Additionally, the supercapacitor exhibited a capacitance retention of 90% during 3000 charging–discharging cycles. Moreover, high mechanical robustness was retained after bending at different angles, thereby suggesting significant potential applications for future flexible and wearable devices.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Haoming Sun,Zhaorui Zhang,Xiaojing Tian,Manli Lu,Bo Wang,Pinhua Zhang,Guangliang Cui,Lulu Du,Kaifeng Xue
Developing a gas sensor for the expedient, rapid, and accurate detection of hydrogen sulfide (H 2 S) in human exhaled breath at room temperature would offer an opportunity for home-style self-monitoring of some chronic diseases. In this work, Cu 2 O-carbon nanofiber (CNF) heterojunctions were prepared by a two-dimensional (2D) electrodeposition in-situ assembly method to detect low-concentration H 2 S gas at room temperature. The heterojunction had a distinct interface, which was confirmed by scanning electron microscopy, transmission electron microscopy and voltammetry tests. The detection limit of the sensor was as low as 5 ppb, and the sensors could directly distinguish the exhaled breath of healthy individuals and simulated patients. We attributed the excellent performances to synergistic effects of the modulation of the heterointerface barrier and the sulfide reaction of Cu 2 O. Furthermore, the adsorption behaviors of H 2 S on the surfaces of pure Cu 2 O and the Cu 2 O-CNF heterojunction were evaluated using the density functional theory (DFT) based on first principles. The results further confirmed that the formation of the heterostructure enhances the H 2 S adsorption capacity and electron transfer of the sensitive material. This study is of great significance for the diagnosis and monitoring of diseases with the exhaled H 2 S biomarker.
研究领域:
材料科学
·
医学诊断
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2025
·
IF 2.6
Changqiu Ma,Daheng Jiang,Linghui Zeng,Lixin Zhu,Xiaoliang Xu
Conventional photoelectrochemical (PEC) biosensors based on ZnO and TiO2 face challenges in applications in vivo due to the poor penetration of excitation light through the skin. To address this limitation, we designed a novel near-infrared (NIR)-driven FTO@UC@Cu2O@TiO2 heterojunction biosensor for subcutaneous L-cysteine detection. NIR light penetrates the skin and excites the upconversion material (called UC for short, NaYF4:Er, Yb), which emits visible light at 540 nm. This emission activates the Cu2O semiconductor to generate photocurrent. The Cu2O@TiO2 heterojunction facilitates charge carrier separation and suppresses electron-hole recombination. The biosensor demonstrates stable, sensitive, and reproducible detection of L-cysteine over a range of 10 μM to 10 pM, with a detection limit of 5.2 pM. Notably, it also enables subcutaneous detection covering a range from 10 μM to 100 pM, with a detection limit of 74 pM. These results provide a promising strategy for real-time in situ monitoring of L-cysteine in clinical applications.
研究领域:
生物传感器
·
纳米技术
·
分析化学
·
生物医学工程
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Hui Xue,Jingli Yin,Weifeng Li,Yumei Long
The exploration of enzyme-mimic nanocomposites to replace commercial enzymes is challenging in the construction of biosensors with high performance. Herein, an ultrafast response nonenzymatic glucose sensor was developed based on a Cu2O–TiO2/Ti3C2Tx nanocomposite, which was prepared via an in situ redox procedure using Ti3C2Tx nanosheets both as a reducing agent and a carrier substrate. Structural characterizations, including X-ray diffraction (XRD) and transmission electron microscopy (TEM), revealed that Cu2O nanoparticles with a size of 10–30 nm are uniformly distributed on the surface of the Ti3C2Tx nanosheets and form close contacts through Ti–O–Cu bonds, resulting in favorable stability of the system. The unique heterostructure of Cu2O–TiO2/Ti3C2Tx can produce abundant active sites and facilitate electron transfer, demonstrating enhanced catalytic activity in the electrooxidation of glucose. Consequently, the electrochemical sensor fabricated by modifying a glassy carbon electrode (GCE) with Cu2O–TiO2/Ti3C2Tx nanocomposites exhibited excellent analytical properties for glucose detection, including a fast response time of 0.1 s, a low detection limit of 0.67 μM, and a high sensitivity of 267 μA mM–1 cm–2. In addition, the developed method possesses good anti-interference ability and superior stability and thus has been successfully applied for real sample monitoring. This study offers a way to construct Ti3C2Tx-based heterostructures with tunable physiochemical properties and expands their use in the electrochemical field.
研究领域:
材料科学
·
电化学
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Wenting Wu,Wenjie Zhao,Yinghao Wu,Chengxu Zhou,Longyang Li,Zhixiong Liu,Jianda Dong,Kaihe Zhou
Biofouling, a global issue, exerts an adverse impact on ocean shipping, deep-sea exploration, aquaculture and other industries. The addition of Cu 2 O particles to coatings is the most popular and effective method used for biofouling resistance in the ocean circumstance. Herein, Cu 2 O particles with three kinds of morphologies, including cube, sphere and cubooctahedron, were fabricated by liquid phase reducing method. Particle size, crystallinity, component, activity in aqueous solution, antibacterial property and copper ion leaching rate were systematically investigated. XRD and XPS jointly reflected that as-prepared Cu 2 O particles were highly pure and impurity was absent. Among three kinds of Cu 2 O particles, cubooctahedron Cu 2 O was the most active, possessed the highest ion leaching rate and exhibited the best antibacterial property. It could be deduced that morphology of Cu 2 O particles affected its activity in aqueous solution, then impacted release rate and ultimately influenced antibacterial capacity. Morphology and component of bacteria, before and after being exposed to as-synthesized Cu 2 O-acrylic hybrid coatings were also studied and results proved that copper ion was prone to do a damage to the cell membrane of E.coli rather than B. subtilis because of the difference between cell walls.
研究领域:
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Huijuan Chen,Li Lv,Kaifeng Xue,Pinhua Zhang,Lulu Du,Guangliang Cui
Developing a portable and compact sensor for room temperature detection of H2S in exhaled breath for health assessment presents considerable technical challenges. This work successfully synthesized Cu2O/ZnO heterostructures with excellent gas sensitivity to H2S at room and lower temperatures using a two-dimensional (2D) electrodeposition in situ assembly method with the application of a semisine wave voltage as well as CuZnO nanoarrays deposited under direct current voltage. The Cu2O/ZnO heterostructure sensors, with high response of 8.53 × 104 to 1 ppm of H2S and a minimum detection limit of 10 ppb at room temperature, exhibit a response of 42 for 10 ppm of H2S even at −20 °C, and its response to 50 ppm of H2S is approximately 3774 times greater than that of the CuZnO sensor, which is a significant challenge to achieve with sensors based on oxygen adsorption/desorption mechanisms. These outstanding gas-sensing properties are attributed to the formation of p–n heterojunctions in the Cu2O/ZnO heterostructures and the occurrence of the sulfuration reaction. In addition, we successfully employed the Cu2O/ZnO sensor to detect H2S in human exhaled breath, offering valuable insights for the monitoring of various chronic diseases and new directions for the development of portable room-temperature breath sensors.
研究领域:
材料科学
·
医学诊断
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Binxia Yuan,Xiaobo Liu,Xiaodong Cai,Xinyi Fang,Jianfeng Liu,Maoliang Wu,Qunzhi Zhu
In the paper, the zinc and cerium or both doped cuprous oxide (Cu 2 O) crystals were successfully synthesized under low temperature by a simple hydrothermal process. The surface morphologies, structure properties, and optical properties of Cu 2 O crystals were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-visible absorption spectroscopy. The morphology of pure Cu 2 O crystals, Zn:Cu 2 O crystals, Ce:Cu 2 O crystals and Zn/Ce:Cu 2 O crystals evolved to irregularly cubic structure, exfoliated octahedron, were regular octahedron, and like-spherical aggregate, respectively. The doping of Cu 2 O crystals not only affected the surface morphologies but also significantly influenced the optoelectronic properties. Compared with undoped cuprous oxide, the doped samples had larger optical band gaps. Finally, the aggregation and diffusion were the most important factors for the morphology evolution of Cu 2 O crystal.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2017
·
IF 4.055
Yitong Han,Min Liu,Keyan Li,Qiao Sun,Chunshan Song,Guoliang Zhang,Zongchao Zhang,Xinwen Guo
Controlled synthesis of metal–organic frameworks (MOFs) in nanometer scale is highly desired for the optimization of properties and the extending of applications. In this work, Cu2O was used as additive for the first time in the synthesis of zirconium-based MOF UiO-66. We found that the amount of Cu2O additive had an important impact on downsizing the crystal size of UiO-66. Cu2O additive plays a role of rate controller of crystal growth of UiO-66 crystals by their competitive coordination behavior with the linker H2BDC between the [Zr–O] clusters. This generates a depleted H2BDC concentration for the coordination with the [Zr–O] clusters for constructing the UiO-66 framework, which favors the production of small crystals. As a result, well-dispersed nanometer scale UiO-66 crystals with mean crystal size of 40 nm can be easily synthesized by the addition of Cu2O. The as-synthesized nanometer scale UiO-66 crystals have a pure crystal structure with high crystallinity and superior porosity.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Dongya Li,Jie Zan,Liping Wu,Shiyu Zuo,Haiming Xu,Dongsheng Xia
The g-C3N4–Cu2O (CNCu2O-G) with a p-n heterojunction structure in the presence of glutamate was successfully developed through hydrothermal synthesis and high-temperature calcination. When addition the glutamate, the surface morphology of the heterojunction was regulated, and its specific surface area increased by a factor of approximately 1.5, and reaction sites were increased. Additionally, the charge recombination rate of the heterojunction was reduced, and the absorption band was red-shifted to 460 nm, leading to stronger heterostructure contact interfaces, thus the visible-light utilization efficiency was enhanced. The catalytic performance of the CNCu2O-G was very stable, with no significant change in the photocatalytic efficiency of CNCu2O-G after six recycles, the Fourier transform infrared patterns and X-ray diffraction of CNCu2O-G exhibited no significant changes after the photocatalytic reaction. Furthermore, electron paramagnetic resonance and free-radical removal experiments indicated that the holes and superoxide radicals were dominant species during the reaction.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Kangfu Wang,Meiru Lv,Tian Si,Xiaoning Tang,Hao Wang,Yuanyuan Chen,Tian Zhou
The effects of exposing crystal planes and vacancy defect engineering can induce unique surface atom arrangements that strongly influence the physicochemical properties of semiconductor materials . This paper used Cu 2 O with different surface structures as a research model. A liquid-phase method was chosen for surface structure regulation to prepare Cu 2 O semiconductors (Vo-(111)Cu 2 O, Vo-(100)Cu 2 O, Vo-(110)Cu 2 O) with different exposed crystalline surfaces analyze the antibacterial mechanisms of other faceted models in the photodynamic antibacterial process. The bactericidal effect of Vo-(111)Cu 2 O (40 μg/mL, 100%) was better than that of Vo-(100)Cu 2 O and Vo-(110)Cu 2 O. DFT simulations show that the photocatalytic antimicrobial performance of Vo-(111)Cu 2 O is improved due to surface defect structures caused by unsaturated coordination bonds and suspension bonds on its exposed crystalline surfaces. The suspension bonds act as active centres for trapping electrons, leading to a lower carrier complexation rate on the material surface. The antibacterial mechanism of Vo-(111)Cu 2 O showed that oxidative sterilization by reactive oxygen species (ROS) was the dominant factor (61.98%) in the antibacterial process. The most potent depolarizing effect on E. coli , the highest copper ion solubilization , and the highest ROS yield. Therefore, ROS oxidative sterilization, copper ion leaching sterilization, and contact damage synergistically affect E. coli from the inside out.
研究领域:
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2017
·Vol. 4
·期 9
·095501
·
IF 1.068
Zuming He,Yongmei Xia,Bin Tang,Jiangbin Su
Magnetically separable NiFe2O4/Cu2O composites were successfully synthesized by a two-step method. The samples were characterized by XRD, XPS, SEM and VSM as well as their PL spectra and UV–vis adsorption spectra. The results showed that the NiFe2O4/Cu2O composites were composed of cubic-structured Cu2O and spinel-structured NiFe2O4, were able to absorb a large amount of visible light, exhibited excellent photocatalytic activity under simulated solar light irradiation and could be easily separated by an external magnetic field. The NiFe2O4/Cu2O composites exhibited higher photocatalytic performance than that of a single semiconductor. It was found that the prominently enhanced photocatalytic performance of NiFe2O4/Cu2O composites was ascribed to the effective separation of photo-generated electron–hole pairs and the effective generation of the hydroxyl radical •OH.
研究领域:
材料科学
·
环境科学
✓ 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）