Journal of Experimental Nanoscience
·
2022
·
IF 2.024
Lijie Zhang,Ying Zhang,Hongtao Wang,Jianbing Chen,Zhongqi Cao
Electrocatalytic CO2 reduction to fuel is one of the important ways to solve energy and environmental problems. In this work, the preparation of hollow Aux-Cu2O electrocatalyst and the performance of electrocatalytic CO2 reduction to ethanol were studied. Hollow Cu2O nanospheres were prepared by a soft template method, and Aux-Cu2O composites were prepared by galvanic replacement. The characterization results of XRD and XPS reveal that Cu+ is the main chemical state of Cu in the catalysts. The results of electroactive surface area demonstrate that the electroactive surface area of Au0.51-Cu2O is the largest. The performance evaluation of electrocatalytic CO2 reduction shows that the Faraday efficiency of H2 on Au0.51-Cu2O is the lowest (∼19.5%) and the Faraday efficiency of ethanol can reach ∼18.8% at −1.2 V vs. RHE. Compared with hollow Cu2O nanospheres, Aux-Cu2O catalysts have an earlier onset for ethanol production and promote the CO2 reduction to ethanol with high efficiency, while the hydrogen evolution reaction is significantly inhibited. Our study demonstrates an effective approach to develop Cu-based electrocatalysts favourable toward ethanol in electrocatalytic CO2 reduction.
研究领域:
材料科学
·
电化学
·
能源与环境科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Huifang Wang,Jun Zhang,Qichong Zhang,Hao Wu,Xiaohong Xu
The p-n heterojunctions with the built-in electric field are often adopted to promote the separation of photoexcited electron-hole pairs and enhance the photoelectrochemical (PEC) performance. However, the interface states often affect the band alignment of ZnO/Cu 2 O heterointerface and cause the decline of PEC performance. In this study, the ultrathin insulating Al 2 O 3 layer was introduced to modify the interface between n-type ZnO nanorod arrays (NRA) and p-type Cu 2 O. Compared to that of ZnO NRA/Cu 2 O, the photocurrent density is significantly improved and onset potential shifts negatively for ZnO NRA-Al 2 O 3 /Cu 2 O. The Al 2 O 3 ultrathin layer is deemed to suppress the photoexcited carriers trapped by the heavy interface defect states via improving the interface quality and block the recombination between electrons in the conduction band of ZnO NRA and holes in the valence band of Cu 2 O. This work broadens the interface modification method of p-n heterojunction and its results are favorable for photovoltaic devices, photodetection and PEC water splitting applications.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Yinchun Fang,Lvxin Chen,Yalan Zhang,Yongqiang Chen,Xinhua Liu
Structural coloration as a novel eco-friendly coloring method without using chemical dyes or pigments has been extensively studied for textile coloring. However, structural colors in creatures not only endow them with vivid colors, but also give them special functions. Therefore, the development of functional structural colored textiles with brilliant colors and special functions will have more practical application values. In this study, the structural colored and functional textiles were prepared by one-step spray coating cuprous oxide (Cu 2 O) single crystal nanospheres on polyethylene terephthalate (PET) fabric. Cu 2 O single crystal nanospheres with five different diameters were prepared to obtain purple, blue, green, yellow-green and orange noniridescent structural colors due to the Mie scattering of Cu 2 O nanospheres. Cu 2 O structural colored fabric showed excellent washing, rubbing and bending colorfastness due to the strong adhesion of polyacrylate (PA). Cu 2 O structural colored fabric showed excellent antibacterial properties for both Gram-positive and Gram-negative bacteria. The antibacterial rates of Cu 2 O structural colored fabric after treatment with 60 min for E. coli and S. aureus were close to 100%. Therefore, this research provides the experimental basis for the development of functional structural colored fabrics with brilliant color and excellent antibacterial properties.
研究领域:
材料科学
·
纺织工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 33
·13641-13647
·
IF 0
Xuejuan Wan,Jilei Wang,Lianfeng Zhu,Jiaoning Tang
In order to investigate the effect of morphology and size on detection sensitivity of ethanol vapor, nano-scale cubic or spherical Cu2O with similar particle sizes were prepared through reductive solution chemistry routes. Experimental results indicated that both size and morphology of Cu2O particles are playing an important role in gas detection sensitivity, and the mutual competition and mutual dependence relationship coexisted between the two factors. Particle morphology and morphology-dependent particle stacking mode may play a dominant role in a relatively lower gas atmosphere (S50, S260 > C50, C340). As the concentration of ethanol vapor exceeds 200 ppm, the size-dependent effect on gas-sensing gradually appears, and nanoparticles with relatively smaller particle size (C50, S50 > C340, S260) are more advantageous in the gas sensing process. At a much higher ethanol partial pressure, Cu2O nanoparticles with smaller size and cubic morphology exhibit the strongest gas-sensing response. The mechanism of these gas-sensing divergences is suggested to involve in the explanation of effective contact surface, width of charge accumulation layer (CAL) affected by gas concentration, energy bands bending changes and particle contact mode.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
RSC Advances
·
2022
·Vol. 12
·期 48
·31415-31423
·
IF 4.036
Yujie Ma,Xindong Wei,Kedeerya Aishanjiang,Yi Fu,Jiamei Le,Hailong Wu
As a narrow band-gap semiconductor, cuprous oxide (Cu2O) has a relatively high conduction band that can exhibit high driving force for the photocatalytic generation of hydrogen under visible light. Besides, its adjustable morphologies and abundant source also make it possible to be employed as a theoretically optimal photocatalyst. However, the low charge migration and poor stability commonly limit its practical application, and various strategies have been explored in previous studies. In this study, we have novelly utilized Au nanorod (NR) and nanobipyramid (NBP) nanocrystallites as well as rGO nanosheets to boost the photocatalytic activity of Cu2O over hydrogen generation. The ternary rGO wrapped Au@Cu2O with a yolk–shelled structure (y-Au@Cu2O/rGO) was synthesized by a handy and controllable method. When excited by solar light (λ > 400 nm), it was found that the H2 yields of Cu2O/rGO, y-Au nanoparticle@Cu2O/rGO, y-Au NR@Cu2O/rGO, and y-Au NBP@Cu2O/rGO were increased in the order of 248, 702, 1582 and 1894 μmol g−1 in 4 h. The outstanding photocatalytic performances of y-Au NR@Cu2O/rGO and y-Au NBP@Cu2O/rGO could be attributed to the combination function of quick electron transfer of rGO and abundant near-infrared-light-driven hot carriers on Au NRs and NBPs that could inject into Cu2O and then a quick transfer to rGO to participate in H2 reduction. Besides the above results, it was also found that Cu2O maintained good stability after several cycling photocatalysis tests, which could be ascribed to the migration of holes from Cu2O to Au that prevented the photooxidation of Cu2O. This study may give a guide to fabricating controllable and effective photocatalysts based on plasmonic metals, semiconductors, or two-dimensional nanosheets, which possess full-solar-light-driven photocatalytic activities in the future.
研究领域:
材料科学
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能源化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Liu Cui,Ziwei Bai,Ziqi Li,Zhaoyun Liu,Huanhuan Ma,Xiaoxu Chen,Kui Lin,Jia Hao,Yuanlu Cui,Fei Tian
Photocatalytic process using core–shell nano-catalyst is an efficient, eco-friendly, and cost-effective process for removal or minimize hazard of pollutants in waste water. Herein, a recyclable and robust Cu 2 O/Fe 3 O 4 @C/Cu core–shell nanocomposite with photocatalyst activities is designed based on the synergistic photocatalytic activities of Cu 2 O and Cu and the magnetic property and stability of Fe 3 O 4 @C. The Cu 2 O/Fe 3 O 4 @C/Cu is shown to act as nano-catalyst to almost completely convert 4-Nitrophenol (4-NP) to 4-aminophenol (4-AP) within 3 min by sufficient electrons in the electron-rich region formed under ultraviolet light irradiation. The Cu 2 O/Fe 3 O 4 @C/Cu nanocomposite shows a good stability, reusability and magnetic separation ability after five recycles. In addition, a photocatalytic mechanism of 4-NP reduction over this nanocomposite is proposed, and the roles of each nanocomponent of this nanostructure played in the synergistic enhancing photocatalytic performance via cascade reaction is demonstrated. This work suggests that Cu 2 O/Fe 3 O 4 @C/Cu nanocomposite with high activity, good stability and magnetically recyclability could be applied for the elimination of pollutants in wastewater.
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
Textiles
·
2025
·Vol. 5
·期 1
·6
·
IF 4.9
Chunxing Zhou,Zhen Yin,Yiqin Shao,Guocheng Zhu,Parpiev Khabibulla,Adkhamjon Gafurov,Juramirza Abdiramatovich Kayumov
Structural color-generating materials are expected to replace pigments and dyes as a new type of color-developing materials with good light stability and bright colors. Due to the relatively high refractive index of Cu2O microspheres, they have strong Mie scattering in the visible region. Herein, various sizes of Cu2O microspheres were synthesized by a two-step reduction method, and the Cu2O spheres were firmly bonded to the fabrics by using the PVA binder. Four different fabrics (cotton, silk, polyester, and nylon fabrics) were evaluated to investigate the physical properties and color fastness. It turns out that the tensile and tearing properties of the Cu2O structured fabrics decreased to a certain extent, and the bursting properties of fabrics increased, except for the cotton structured fabrics. Meanwhile, all the structural colored fabrics showed excellent color fastness to shearing, rubbing, and washing. This study provides experimental data for developing the application of structural colors on different fabrics.
研究领域:
材料科学
·
纺织工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Xiuying Liu,Qianna Xia,Jiao Zhou,Bowen Li,Shuaiqi Zhao,Long Chen,Aimal Khan,Xiaoxia Li,Aihua Xu
The design of efficient heterogeneous catalysts in bicarbonate-activated hydrogen peroxide systems (BAP) is a hot topic in wastewater treatment. In this work, Cu 2 O nanoparticles with different morphologies including cubic shape (c-Cu 2 O), octahedron shape (o-Cu 2 O) and spherical shape (s-Cu 2 O), were applied in BAP for the first time to degrade tetracycline hydrochloride (TC). Compared with Cu 2+ ions and CuO, TC degradation was boosted in the presence of Cu 2 O in the BAP system, with the degradation rate following the order c-Cu 2 O > o-Cu 2 O > s-Cu 2 O. The morphology-dependent effects could be linearly correlated with the ratio of surface oxygen species (O S ), but not with the surface area or Cu(I) ratio. The c-Cu 2 O catalyst with exposure of (100) facets contained 76.6% O S as the active site for H 2 O 2 adsorption and activation, while the value was much lower for o-Cu 2 O and s-Cu 2 O with dominant (111) facets. The presence of HCO 3 − enhanced the interactions among Cu 2 O, H 2 O 2 and TC, leading to facile oxidation of Cu(I) to Cu(II) by H 2 O 2 , and the formation of various reactive species such as hydroxyl radicals and Cu(III) contributed to TC degradation. This work provides a new method for enhancing H 2 O 2 activation with heterogeneous catalysts by crystal facet engineering.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Mingxia Li,Haiyan Wang,Xiaoxia Wang,Qiujun Lu,Haitao Li,Youyu Zhang,Shouzhuo Yao
Photoelectrochemical (PEC) sensing has emerged as a simple and practical method for the analysis and detection, its separated optical signal and detection electrical signal give it the advantages of reduced background noise and outstanding sensitivity. Here, we synthesized a Ti 3 C 2 /Cu 2 O composite through simple oil bath heating process, whose excellent PEC performance and sensitive photoelectric response to glucose make it a propitious substitution to glucose oxidase . On this basis, we construct a PEC non-enzymatic sensor based on the Ti 3 C 2 /Cu 2 O heterostructure for the detection of glucose. Under the optimal conditions, the photocurrent of Ti 3 C 2 /Cu 2 O is linear with the logarithm value of glucose concentration in the wide range of 0.5 nM to 0.5 mM with a detection limit of 0.17 nM. Furthermore, the successful detection of glucose in standard samples and human serum by the proposed Ti 3 C 2 /Cu 2 O based PEC non-enzymatic sensor demonstrates the application prospect of heterostructure material in PEC sensor, which provides a new thought for the design and construction of PEC non-enzymatic sensing platform.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2019
·Vol. 15
·期 17
·1805478
·
IF 10.856
Kai Jia,Jiahua Ye,Guoxin Zhuang,Zanyong Zhuang,Yan Yu
Fabrication of low-dimensional nano-MOFs as well as nanoparticles/metal-organic frameworks (MOFs) hybrids has sparked new scientific interests but remains a challenging task. Taking Cu 3 (BTC) 2 as a proof of concept, it is demonstrated thats NH 3 ⋅H 2 O solution of a confined pH value can readily shape the bulk Cu 3 (BTC) 2 into nanoscale Cu 3 (BTC) 2 , beyond the need to control the crystal growth kinetics of MOFs. Adjusting the pH of NH 3 ⋅H 2 O within a much small range (10–11) allows fine tuning over the size and shape of nanoscale Cu 3 (BTC) 2 . Particularly at pH = 11, NH 3 ⋅H 2 O exhibits weak reducibility that triggers a reduction of part of Cu 3 (BTC) 2 into Cu 2 O, while shaping the other into Cu 3 (BTC) 2 nanowires. Benefiting from the coincidence of reduction and etching effects, the newly generated Cu 2 O dots can in situ anchor onto adjacent Cu 3 (BTC) 2 nanowires at highly dispersive state, forming a well-defined sponge-like architecture built of Cu 2 O dots and nano-Cu 3 (BTC) 2 . The CuO x derived from annealing of the Cu 2 O dots/nano-Cu 3 (BTC) 2 hybrid preserves the sophisticated sponge architecture and high porosity, and exhibits promising applications in phenol scavenging, with efficiency outperforming its counterparts and many other Cu-based catalysts reported in literature. It is anticipated that the findings here pave the way for the rational design of intricate nano-MOFs in a more efficient way.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xueqin Yuan,Fei Pei,Xiaolin Luo,Huanting Hu,Huaming Qian,Pin Wen,Kangkang Miao,Sifan Guo,Wei Wang,Guodong Feng
Fabrication of heterojunction is an effective way of improving the photocatalytic performance of semiconductor in the photocatalytic wastewater treatment. ZnO/Au@Cu 2 O heterojunctions were successfully synthesised using Au nanoparticles loaded onto the surface of ZnO nanorods as heterostructural seeds to induce in situ growth of Cu 2 O shells. X-ray diffraction, transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, electrochemical workstation and UV–vis diffuse reflection spectrograph were employed to analyze the structures, compositions and photoelectric properties of the synthesised photocatalysts. After 45–90 min of the photocatalysis of ZnO/Au@Cu 2 O heterojunctions under simulated sunlight, the degradation efficiencies of methyl orange and rhodamine B could reach 93.0% and 99.6%, respectively, which were much higher than those with mono- and bi-component catalysts. The photocatalytic system with ZnO/Au@Cu 2 O can achieve deep mineralization to decompose organic dye molecules into non-toxic products. The formation of heterostructures not only could expand the spectral absorption range to the visible region but also efficiently facilitate charge separation to transfer more photo-generated holes and electrons to generate oxidative hydroxyl and superoxide radicals. A Z-scheme charge separation mechanism was proposed according to the determination of radical species and energy band structures of ZnO–Cu 2 O.
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 MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 2
·1-11
·
IF 2.8
Wu Xiaoping,Chen Long,Hu Haihua,Song Changsheng,Jiang Qi,Wang Peng,Xu Lingbo,Lin Ping,Cui Can
Cu 2 O@SnS 2 heterojunction photocatalysts with one-dimensional hierarchical nanostructure were prepared by the solvothermal method. The Cu 2 O@SnS 2 hierarchical nanostructure is composed of Cu 2 O nanowire core as well as in situ grown ultra-thin SnS 2 nanosheets on Cu 2 O nanowires. The hierarchical Cu 2 O@SnS 2 composite shows higher catalytic activity, and the degradation ratio of MB reaches nearly 100% at 80 min. The first-order reaction kinetic constant of Cu 2 O@SnS 2 is 0.045 min − 1 , which is much higher than that of Cu 2 O (0.003 min − 1 ) and SnS 2 (0.014 min − 1 ). The improvement in photocatalytic performance is mainly due to the formation of typical heterojunction between Cu 2 O and SnS 2 . Photo-induced electrons in the CB of Cu 2 O react with oxygen to form superoxide radicals (·O 2− ) with strong oxidation ability. At the same time, the photo-induced holes in the VB of SnS 2 also have strong oxidation ability, and the two can synergistically induce the degradation of pollutants. In addition, SnS 2 nanosheets not only provide a large number of reaction sites for photocatalytic degradation, but also facilitate the migration of photo-induced carrier to the surface. The unique hierarchical Cu 2 O@SnS 2 microstructure can also promote multiple light scattering within the material to enhance light absorption. Thus, the one-dimensional hierarchical Cu 2 O@SnS 2 is a promising new visible light catalyst, which has potential application prospect in environmental protection and wastewater treatment.
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）