JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
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IF 2.999
Mingxuan Sun,Yalin Fang,Ying Wang,Shanfu Sun,Jia He,Zhi Yan
A ternary composite of Cu 2 O, graphene and rutile TiO 2 nanorods was prepared using Cu(CH 3 COO) 2 ·H 2 O, graphene oxide and TiCl 4 as the starting materials and its enhanced photocatalytic performance was demonstrated. Graphene/TiO 2 nanorod composites (GT) were obtained by a simple hydrothermal method and then, Cu 2 O was coupled onto the surface of graphene/rutile TiO 2 to form Cu 2 O/graphene/rutile TiO 2 nanorod (CGT) composites via a chemical bath deposition process. The as-prepared sample was characterized by X-ray diffraction (XRD), emission field scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), specific surface area analyzer (BET), Raman spectroscopy and ultraviolet–visible diffuse reflectance spectroscopy (UV–vis DRS). It is found that the introduction of graphene and Cu 2 O has little effect on the morphology of TiO 2 nanorods with average dimensions of 140 nm (length) × 30 nm (diameter) (L/D ratio ≈5). A red shift of light absorption edge and more absorption in the visible light region were observed for the resulted ternary samples compared with TiO 2 and graphene/TiO 2 composites. The photocatalytic activity was evaluated by the photodegradation of methylene blue under visible light irradiation, which showed 2.8 times corresponding enhancement of the degradation efficiency for the ternary composites compared with TiO 2 . This work provides a new strategy to improve the visible light response of TiO 2 and facilitate its application in environmental remediation.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2017
·
IF 0
Quan Wang,Tuo Li,Pengfei Xie,Jiahai Ma
In this study, the interface effects of Cu 2 O and Au/Cu 2 O semiconductors were improved by addition of a magnesia (MgO) interface nanolayer (MIN) deposited via precipitation. The morphologies, crystal structures, chemical compositions, elemental states and optical properties of MgO/Cu 2 O and Au/MgO/Cu 2 O heterojunctions were characterized via SEM, XRD, XPS, UV–VIS–NIR and PL. It was found that the MIN has a surface passivation effect that inhibits the aggregation and oxidation of Cu 2 O. This enhances Cu 2 O semiconductors’ wettability and stability, improves crystallinity and reduces Au particle sizes. More importantly, the MIN promotes charge transfer via tunneling through the insulator, and enhances adsorption of molecular oxygen, facilitating superoxide radicals formation during photoreactivity. MgO/Cu 2 O and Au/MgO/Cu 2 O exhibited superior photodegradation of methyl orange, attributed to the boost of O 2 − and h + . This work confirmed the importance of MIN as a useful modification of semiconductor photocatalysts, and the MIN can significantly enhance the production of superoxide radicals in the photocatalytic activity with visible light.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 28
·13668-13675
·
IF 9.931
Hongtao Guan,Pan Cai,Xiaomeng Zhang,Yanlin Zhang,Gang Chen,Chengjun Dong
We demonstrate the design and fabrication of novel Cu2O@Mn(OH)2 core–shell hierarchical structures using octahedral Cu2O as a template. The Cu2O backbone supports the growth of an ultrathin Mn(OH)2 nanoflake shell, leading to a relatively large surface area (65.8 m2 g−1) for sufficient utilization of active materials. Cyclic voltammetry (CV) and galvanostatic charge–discharge measurements (GCD), as well as cycling stability and electrochemical impedance spectroscopy (EIS) were performed to examine the electrochemical performances of the Cu2O@Mn(OH)2 core–shell structure. Applied as a supercapacitor electrode, the Cu2O@Mn(OH)2 composite delivers a high specific capacitance of 540.9 F g−1 at 1 A g−1 and an energy density of 6.4–18.2 Wh kg−1. After conducting 3000 cycles at 5.0 A g−1, the capacitance retention of 71.5% was achieved. The unique core–shell structure of the Cu2O@Mn(OH)2 composite favours the effective transport of electrolytes and shortens the ion diffusion path. In addition, the synergetic effects from both Cu2O and Mn(OH)2 significantly enhance the electrochemical performances. Our findings suggest that this Cu2O@Mn(OH)2 core–shell is very promising for next generation high-performance supercapacitors.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
You Wu,Yuqi Li,Huan Li,Hai Guo,Qi Yang,Xiaoming Li
Cu 2 O is an attractive material for the architectural design of integrated nanomaterials in photocatalysis. Herein, a contrastive study was carried out to explore the influence of morphology/exposed Cu 2 O facets on the template growth process and the difference of fabricated composites in photocatalysis performance. A series of Cu 2 O@HKUST-1 with core–shell structure was developed via a self-confinement strategy, in which Cu 2 O nanocrystals with various shapes (cube, truncated octahedron and octahedron) act as self-confinement template to grow Cu-based metal–organic frameworks (HKUST-1) shell. It was revealed that the growth of HKUST-1 on Cu 2 O crystal depended on the original Cu 2 O crystal. The exposure of (1 1 1) facet in Cu 2 O was more favorable to the growth of HKUST-1 than (1 0 0) crystal plane. Optical and photoelectrochemical characterizations revealed that the cubic Cu 2 O@HKUST-1 exhibited the outstanding light response and most efficient interfacial charge transfer and separation among three types of composites. As a result, the degradation rates of tetracycline hydrochloride (TC-HCl) by cubic Cu 2 O@HKUST-1 under the visible light irradiation was 95.35% within 60 min, which was much higher than truncated octahedral Cu 2 O@HKUST-1 (78.81%) and octahedral Cu 2 O@HKUST-1 (66.58%). Mechanism explorations including radical capture experiments, electron paramagnetic resonance and band structure analysis showed that type II heterojunction was formed in cubic Cu 2 O@HKUST-1 and truncated octahedral Cu 2 O@HKUST-1, which was conducive to the separation and transfer of photo-generated carriers. However, type I heterojunction existed in octahedral Cu 2 O@HKUST-1 lead to the recombination of photocarriers. These findings revealed the interface-dependent photocatalytic performance in Cu 2 O@HKUST-1 and provided useful guidance for controllable construction of photocatalysts with heterojunction structure.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Bio Materials
·
2019
·
IF 0
Huifan Li,Jiahui Zhong,Huijuan Zhu,Yuping Yang,Mengna Ding,Liulin Luo,Yuning Huo,Hexing Li
The hybrid Cu2O-TiO2 photocatalytic composite with a p-n heterojunction was synthesized by the supercritical solvothermal route. The uniformly distributed Cu2O was stably combined with TiO2 to benefit the increase of the specific surface area, the harvesting of visible light, and the separation of photogenerated holes and electrons. As a result, photocatalytic inactivation of Acinetobacter baumannii under visible-light irradiation was facilitated. Based on the photogenerated holes acting as the main active species, the Cu2O-TiO2 photocatalytic heterojunction could induce the leakage of K+ ions and serious damage of the cell structure, leading to the final cell death. During the photoantibacterial process on Cu2O-TiO2, the RecA gene played a significant role in enhancing the survival rate of Acinetobacter baumannii. Furthermore, the great bactericidal effect of Cu2O-TiO2 nanocomposites to different bacteria indicated the potential application for the environment-friendly disinfection.
研究领域:
微生物学
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环境科学
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材料科学
✓ 已验证
DOI
PubMed
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 333
·期 1
·545-556
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IF 1.6
Tang Haoming,Zhang Mingzhu,Ran Fengya,Sun Shiyong,Golubev Yevgeny Aleksandrovich,Zhao Qian,Lin Sen,Duan Tao,Kotova Olga Borisovna
The Cu 2 O/Cu modified shungite (ShC) absorbent (Cu 2 O/Cu-ShC) was synthesized by hydrothermal method, benefiting from the mineral backbone and Cu 2 O/Cu particles, Cu 2 O/Cu-ShC can remove ~ 96% of I − within 60 min, the batch experiments showed that the I − adsorption process follows pseudo-second-order model and Langmuir model with maximum adsorption capacity of 10.99 mg/g. The high binding affinity between Cu + and I − contributes effective removal of I − and excellent selectivity at high concentrations of competing ions. This work highlights the feasibility of Cu 2 O/Cu-ShC for the radioactive iodine separation, and provides a promising sorbent material for large-scale purification of radioactive iodine anions in wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Zongxu Liu,Jiaxue Song,Tao Wang,Huaiqiang Liu,Jie Chen,Yuanyuan Sun,Pinhua Zhang,Guangliang Cui
Technology development of low-concentration H 2 S sensing at low temperatures is of great significance for real-time surveillance of specific diseases and environment. In this work, a new Cu 2 O/graphene heterojunction sensor with an ideal interface is fabricated by 2D electrodeposition in-situ assembly method. The sensor is extremely selective to H 2 S and exhibits ultra-high H 2 S sensing properties at room temperature (R = 24125.785 % for 500 ppb H 2 S). Notably, the synergistic effects of barrier modulation and the sulfide reaction enable the sensor to detect H 2 S at concentrations as low as 5 ppb (R = 386 %) at 20 °C. Moreover, it exhibited good gas sensitivity even at temperatures as low as −20 °C (R = 71.26346 % for 100 ppb H 2 S). Furthermore, a sensor device was successfully manufactured for practical detection, which could be used for rapid detection of exhaled air and atmospheric monitoring. This work provides a new strategy for the design of high-sensitive and reliable room-temperature sensing materials for trace H 2 S gas detection.
研究领域:
材料科学
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环境科学
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医学检测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jing Niu,Zhelin Song,Xin Gao,Yun Ji,Yanlin Zhang
It is of great significance to achieve superior degradation of contaminants by developing efficient and stable photocatalysts . To boost the photocatalytic performance of Bi 2 WO 6 for tetracycline degradation, the Bi 2 WO 6 composites ( Bi 2 WO 6 /C@Cu 2 O) were constructed by introducing Cu 2 O coated by carbon layer (C@Cu 2 O with 5 wt% of Bi 2 WO 6 ) in this study. Bi 2 WO 6 /C@Cu 2 O presents an excellent performance on tetracycline degradation because of the generation of more active species as ∙ O 2 - and ∙ OH. Its kinetic rate constant k was 2.8 times of pure Bi 2 WO 6 and tetracycline degradation efficiency maintained outstanding stability even after 4 cycles. This benefits from the higher photogenerated charge separation and electron transfer possessed by Bi 2 WO 6 /C@Cu 2 O compared to Bi 2 WO 6 . Various intermediates of tetracycline degradation were identified and the possible degradation pathways were proposed. The tetracycline degradation by Bi 2 WO 6 /C@Cu 2 O followed a Z-scheme photocatalysis mechanism. In addition to acting as the protective layer of Cu 2 O to attenuate the photo-corrosion of Cu 2 O, the oxygen containing functional groups C O on the surface of carbon layer could provide an electron transfer channel between the interface of Bi 2 WO 6 and Cu 2 O to reduce the interfacial charge-transfer resistance and accelerate the electron transfer.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 5
·857
·
IF 3.9
Qianqian Zhou,Yanxin Chen,Haoyan Shi,Rui Chen,Minghao Ji,Kexian Li,Hailong Wang,Xia Jiang,Canzhong Lu
Cu2O is a p-type direct bandgap semiconductor with a band gap of 2~2.2 eV, which has excellent visible light absorption and utilization. However, slow charge transfer and poor stability hinder its practical application. In this paper, a facile electrodeposition approach successfully synthesized the heterostructure of p-Cu2O and n-Cu2O. The protective layer of n-Cu2O on the surface of p-Cu2O nanoparticles forms a p/n heterojunction. Due to the p/n heterojunction, the PEC performance of p/n-Cu2O is enhanced significantly. The charge separation efficiency of photogenerated electron/hole pairs in p/n-Cu2O is greatly improved. Therefore, p/n-Cu2O shows superior photoelectrochemical (PEC) CO2reduction reaction (CO2RR) efficiency when used as a photocathode.Keywords:Cu2O;electrodeposition;p/n heterojunction;carbon dioxide reduction reaction
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 5
·3817-3824
·
IF 2.22
Xie Zhipeng,Zhou Yan,Guan Linlin,Muhammad Sajjad,Jiang Yuhan,Zhang Shuyu,Yu Chunxin,Jiao Yangjing,Zhang Shuangshuang,Ren Yang,Zhou Xiaowei,Liu Zhu
Effect of the impurity in Cu 2 O nanowire on the degradation of methyl orange under light irradiation in dark circumstances was investigated. Here, we present the fabrication of Cu 2 O nanowires at different temperatures (110, 130, 150, 170, and 190 °C) by a facile hydrothermal route. Meanwhile, at the synthesis temperature of 110–150 °C, the major impurity in Cu 2 O nanowires was Cu 4 O 3 , and a new Cu impurity was introduced in the Cu 2 O nanowires as the synthesis temperature increased from 170 to 190 °C. Overall, as the synthesis temperature increases from 110 to 190 °C, the total impurity decreases in Cu 2 O nanowires. The fast degradation rate in dark circumstances has been achieved in Cu 2 O nanowires for all synthesis temperatures, which can be attributed to the Cu 2+ in the Cu 4 O 3 impurity of Cu 2 O nanowires. This result shows that the Cu 2 O nanowires obtained at the synthesis temperature of 150 °C have the fastest degradation rate for both under light irradiation and in dark circumstances. It has been found that under light irradiation, the Cu impurity in Cu 2 O nanowires plays a vital role in the degradation of methyl orange. In the current scenario, different impurity contents influence the catalyst activity of Cu 2 O nanowires under the visible light or dark, respectively.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
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2022
·
IF 4.291
Minjie Ni,Shuai Han,Zhiping Liang,Siwei Liu,Xiangzhao Zhang,Shahid Hussain,Mingsong Wang,Guanjun Qiao,Guiwu Liu
Realizing room-temperature detection to low concentrations of hazardous gases can not only contribute to the long-term stability and low power consumption of gas sensors, but also benefit the life and health of human being. In this work, we firstly fabricated mulberry-like Cu 2 O/CuO composites by one-pot hydrothermal method . The optimized Cu 2 O/CuO nanocomposite exhibits the outstanding room-temperature sensitivity to NO 2 , such as the higher response, shorter response & recovery time, and lower detection threshold. Specifically, the room-temperature responses (ΔR/Ra) arrive at 19.3%, 62.3%, 70.9% and 82.0% to 0.01, 0.1, 1 and 10 ppm NO 2 , and the response & recovery time are 58 and 250 s while employing 0.1 ppm NO 2 , respectively. Furthermore, the optimized Cu 2 O/CuO composite presents excellent selectivity and reproducibility, good long-term stability to NO 2 , and non-monotone humidity dependence of response. Specifically, the fluctuations of response are less than 1.5% to 0.1 – 1 ppm NO 2 after five cycles, and ∼2% and 3% to 0.1 and 0.5 ppm NO 2 for 30 consecutive days, respectively. Finally, the gas sensing mechanism is also proposed based on the microstructure and microchemistry of the optimized Cu 2 O/CuO composite, the redox reactions on the surface, and the formation of p-p heterojunction . This work provides a promising candidate material for room-temperature detection of NO 2 .
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 9
·e4448
·
IF 3.581
Shiyu Zuo,Haiming Xu,Wei Liao,Lei Sun,Donghui Han,Jie Zan,Binyang Zhang,Dongya Li,Dongsheng Xia
Acid-treated g-C 3 N 4 -Cu 2 O was prepared by hydrothermal reduction followed by high temperature calcination and acid exfoliation. The structures and properties of as-synthesized samples were characterized using a range of techniques, such as X-ray photoelectron spectroscopy, scanning electron microscopy, Photoluminescence Spectroscopy and the Brunauer–Emmett–Teller (BET) theory. The photocatalytic activity was evaluated by measuring the photodegradation of methyl orange under visible-light irradiation. Based on the results of TEM, XPS, EPR and other techniques, it was verified that a heterojunction was formed. The acid treatment process can increase the specific surface area to form abundant heterojunction interfaces as channels for photo-generated carrier separation, thereby enhancing its light utilization and quantum efficiency. Results indicate that acid-treated g-C 3 N 4 -Cu 2 O possesses a large specific surface area, which provides plentiful activated sites for heterojunctions to form; in addition, it showed a high visible light effect and the minimum charge-transfer resistance. Furthermore, the g-C 3 N 4 -Cu 2 O material exhibits high levels of effectiveness and stability. Electron paramagnetic resonance and a series of radical trapping experiments demonstrate that the holes and •O 2 − could be the main active species in methyl orange photodegradation. This work could provide new insights into the fabrication of composite materials as high-performance photocatalysts, and facilitate their application in addressing environmental protection issues.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）