RSC Advances
·
2021
·Vol. 11
·期 60
·37760-37766
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IF 3.361
Xiaodong Yang,Jia Li,Jianhua Yao,Tianrui Ren,Bo Zhang
The precise control architectures of Cu2O crystals are very crucial, which have a significant influence on their various performances. Herein, Cu2O crystals with diverse architectures were achieved via finely adjusting the concentration of NaOH. The intriguing results showed that the addition of specific amounts of OH− to the solution was crucial to tailor the morphology and size of the resulting microcrystals. We observed the evolution of the shapes of the Cu2O microcrystals, which change from a rhombic dodecahedron to spherical, octahedral-like and then to hexapod upon the increase in the NaOH concentration. Adjusting the volume of NaOH added provides a means to vary the particle size. Furthermore, density functional theory (DFT) may reveal that OH− ions serve as an efficient coordination agent selectively adsorbing onto different crystal faces of Cu2O crystals modifying the crystal energies, inducing the structure anisotropy on crystal growth. This work reveals that an effective and facile strategy has been developed for morphology-control of Cu2O crystals.
研究领域:
材料科学
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化学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xingxing Huang,Yingzhang Shi,Cheng Liu,Zhiwen Wang,Jinhong Bi,Jimmy C. Yu,Ling Wu
A series of Cu 2 O clusters/MIL-100(Fe) heterojunctions with different Cu 2 O mass ratios were constructed as the photocatalysts for N 2 fixation. An optimal nitrogen fixation performance of 51.22 μmol·g −1 ·h −1 is achieved when the mass fraction of Cu 2 O is 20 %. Isotope analysis experiments confirmed that the nitrogen source is N 2 . Possible intermediate signals during photocatalytic reactions were detected by in situ DRIFTS. XPS results further confirm the formation of Cu 2 O/MIL-100(Fe) heterojunctions, and that the existence of Cu–O surface interactions is the key to efficient electron transfer. It is revealed that the improvement of the catalytic performance is derived from the formation of heterojunction which regulates the energy band structure as well as promotes the separation of photogenerated electron-hole pairs. This study proposes a possible mechanism of photocatalytic nitrogen fixation and emphasizes the role of surface interaction and electron transfer in type-II heterojunction in improving nitrogen fixation performance.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-13
·
IF 15.7
Dai Zechuan,Chen Yanxu,Zhang Huaikun,Cheng Mingyu,Zhang Bocheng,Feng Pingyi,Feng Yafei,Zhang Genqiang
Electrochemical urea synthesis has recently emerged as a fascinating energy-efficient alternative route, while it remains challenging to achieve simultaneously high production rate and Faradaic efficiency. Herein, we realize an energy-favorable electrochemical C-N coupling path through CO 2 and NO 3 − co-reduction at the heterointerfaces of Cu/Cu 2 O microparticles, generated by in-situ electrochemical engineering on bulk Cu 2 O. We achieve urea production rate of 632.1 μg h −1 mg cat. −1 with a corresponding Faradaic efficiency of 42.3% at −0.3 V (versus RHE) under ambient conditions. Operando synchrotron radiation-Fourier transform infrared spectroscopy, along with theoretical calculations, reveals the coupling of intermediates NOH* and CO* at the heterointerfaces, benefiting from the modified electronic structure. This work provides a practical route for catalyst design and insights into urea electrosynthesis systems.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
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2023
·Vol. 30
·期 4
·1295-1302
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IF 2.6
Wang Xu,Xu Gen,Zhou Zhiwei,Qin Xiaojuan,Su Yuansha,Zhang Xianbin,Wu Wenliang
New Cu 2 O@TiO 2 core-shell microspheres were successfully prepared for the first time in this paper. The XRD, N 2 adsorption-desorption, SEM, TEM, EDX and XPS characterizations were utilized to investigate the physical and chemical properties. The liquid phase oxidation of naphthalene was also carried out to test their catalytic performance. The characterization results indicating that the Cu 2 O microspheres were firstly formed by hydrothermal treatment and the rutile TiO 2 coating on the surface would be formed by the hydrolysis of tetrabutyl titanate. The Cu 2 O@TiO 2 - 5.0 catalyst with the molar ratio of copper to titanium species as high as 5.0 has the largest surface area and maximum pore volume resulting from the integrated microspheres with rougher surface thickness of about 6.3 nm, and it showed higher catalytic performance in the liquid phase oxidation of naphthalene. Naphthalene conversion of 43.2%, 1, 4-naphthoquinone selectivity of 26.7% and phthalic anhydride selectivity of 53.4% can be obtained, and it only slightly decreased even after repeated use for 5 times. The method would provide a valuable theoretic reference for the hindrance of Cu 2 O rapid deactivation and the industrial application of the naphthalene oxidation to produce high valuable chemicals.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2014
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IF 0
Li Min Qian,Jie Zhou,Chu Zheng,Di Chen,Bi Shen,Yong Kun Liu,Li Xiao Wang,Yan Hua Tong
Cu2O, a p-type semiconductor, has broad potential applications, especially as a visible-light photocatalyst. This paper presents a simple water-bath reflux to prepare Cu2O micro/nanoparticles. The morphology evolution from intact octahedrons to surface-pitted spheres was obtained by adjusting reducing agent and additive. Reflectance spectra show similar photo-absorption intensity and the same range from 250 nm to 650 nm. However, they perform different photocatalytic activity. Intact octahedron has the best photodegradation ability and next is vertex-and edge-damaged octahedron, the lowest for vertex-free polyhedrons and surface-pitted spheres. The enhanced photocatalytic activity for intact octahedrons should to be attributed to its surface characteristics of high index. Our study not only provides a simple method for controllable preparation of Cu2O micro/nanoparticles with different morphologies but also confirms the effect of morphologies on photocatalytic activity.
研究领域:
材料科学
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化学
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DOI
JOURNAL OF POWER SOURCES
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2021
·
IF 9.127
Wenwen Li,Hongyan Wang,Zhe Sun,Quanping Wu,Song Xue
Cuprous oxide (Cu 2 O) is an attractive photo-electrocatalyst for sustainable hydrogen production . The main issues limiting the use of Cu 2 O as a photocathode are the severe electron-hole recombination and photo-corrosion in aqueous electrolyte . Herein, to address the above issues, amorphous SiO x overlayers have been deposited on the surface of Cu 2 O as a protective cover using a facile dip-coating method. The overall PEC performances have been greatly improved, as evidenced by the increased photocurrent density (3.1 times of bare Cu 2 O) and improved stability (3.8 times of bare Cu 2 O). The structure and PEC characterizations prove that Si has been gradient-doped into the Cu 2 O, leading to a downward band bending from the bulk to the surface region, which promotes the charge separation and transfer efficiently. In addition, the amorphous SiOx layers serve as protection layers and prevent the Cu 2 O from direct contact with the electrolyte, maintaining a high photocurrent density over the stability test. Decoration with Pt catalyst has further boosted the photocurrent density to be 2.8 mA cm −2 at 0 V vs. RHE with better stability, indicating the synergistic effect of SiOx layer and Pt catalyst This work provides a facile strategy to improve the PEC activity and stability of Cu 2 O, which may be extended to other systems with photo-corrosion problems, such as BiVO 4 or ZnO.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
iScience
·
2024
·
IF 4.6
Hong Qian,Binxia Yuan,Yuhao Liu,Rui Zhu,Weiling Luan,Chengxi Zhang
In this study, a method was developed to create oxygen vacancies in Cu 2 O/TiO 2 heterojunctions. By varying the amounts of ethylenediaminetetraacetic acid (EDTA), sodium citrate, and copper acetate, Cu 2 O/TiO 2 with different Cu ratios were synthesized. Tests on CO 2 photocatalytic reduction revealed that Cu 2 O/TiO 2 ’s performance is influenced by Cu content. The ideal Cu mass fraction in Cu 2 O/TiO 2 , determined by inductively coupled plasma (ICP), is between 0.075% and 0.55%, with the highest CO yield being 10.22 μmol g −1 h −1 , significantly surpassing pure TiO 2 . High-resolution transmission electron microscopy and electron paramagnetic resonance studies showed optimal oxygen vacancy in the most effective heterojunction. Density functional theory (DFT) calculations indicated a 0.088 eV lower energy barrier for ∗CO 2 to ∗COOH conversion in Cu 2 O/TiO 2 with oxygen vacancy compared to TiO 2 , suggesting that oxygen vacancies enhance photocatalytic activity.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
TETRAHEDRON
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2018
·
IF 2.377
Lingxian Liu,Zengguang Li,Changjun Chen,Huanrong Li,Lijin Xu,Zhiyong Yu
An efficient protocol for dealkylation of aryl alkyl ethers under the catalysis of inexpensive and easily reusable Cu 2 O has been described. The phenol products were obtained in high yields, and a range of functional groups were well tolerated. The choice of solvent is critical to the catalysis, and CH 3 OH proved to be the optimal choice. Mechanistic investigations showed that this reaction possibly proceeds via a single-electron transfer (SET) process.
研究领域:
有机化学
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催化化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2014
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IF 5.9
Qingyong Tian,Wei Wu,Lingling Sun,Shuanglei Yang,Mei Lei,Juan Zhou,Ying Liu,Xiangheng Xiao,Feng Ren,Changzhong Jiang,Vellaisamy A. L. Roy
Heterogeneous photocatalysis is of great interest for environmental remediation applications. However, fast recombination of photogenerated electron–hole pair and a low utilization rate of sunlight hinder the commercialization of currently available semiconductor photocatalysts. In this regard, we developed a unique ternary single core-double shell heterostructure that consists of α-Fe2O3@SnO2@Cu2O. This heterostructure exhibits a tube-like morphology possessing broad spectral response for the sunlight due to the combination of narrow bandgap and wide bandgap semiconductors forming a p–n heterojunction. To fabricate such a short nanotube (SNT), we used an anion-assisted hydrothermal route for deposition of α-Fe2O3, a seed-mediated deposition strategy for SnO2, and finally an aging process to deposit a Cu2O layer to complete the tube-like ternary α-Fe2O3@SnO2@Cu2O single core-double shell heterostructures. The morphology, composition, and photocatalytic properties of those ternary core–shell–shell heterostructures were characterized by various analytical techniques. These ternary heterostructures exhibited enhanced photocatalytic properties on the photodegradation of the organic dye of Rhodamine B (RhB) under simulated sunlight irradiation. The origin of enhanced photocatalytic activity is due to the synergistic effect of broad spectral response by combining narrow bandgap and wide bandgap semiconductors and, hence, an efficient charge separation of photogenerated electron–hole pairs facilitated through the p–n heterojunction. Furthermore, our unique structure provides an insight on the fabrication and controlled preparation of multilayer heterostructural photocatalysts that have intriguing properties.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yongmei Xia,Zuming He,Kejun Hu,Bin Tang,Jiangbin Su,Ya Liu,Xiaoping Li
In order to further improve the photocatalytic activity, Cu 2 O coupled with SrTiO 3 was for the first time constructed by introducing SrTiO 3 to Cu 2 O and synthesized via a two-step route. The obtained n-SrTiO 3 /p-Cu 2 O heterojunction photocatalysts were systematically characterized by XRD , XPS , SEM, UV–vis spectra, etc., showing that n-SrTiO 3 /p-Cu 2 O composites were formed by coupling SrTiO 3 submicroparticles with Cu 2 O cubic micrometer structure. Photocatalytic results demonstrated that the introduction of SrTiO 3 brought about significant enhancement of photocatalytic activity of Cu 2 O, which led to the fact that SrTiO 3 could serve as cocatalyst for the degradation of pollutant MB by forming p-n heterojunction to accelerate photo-generated charge carriers separation and migration and providing enriched active sites. The obtained n-SrTiO 3 /p-Cu 2 O heterojunction composites showed good stability and recyclability in the process of photo-degradation. Besides, the possible photocatalytic mechanism was proposed.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Xinzhou Ma,Jingtao Zhang,Biao Wang,Qiuguo Li,Sheng Chu
Solar photoelectrochemical (PEC) hydrogen production is a promising way for solving energy and environment problems. Earth-abundant Cu 2 O is a potential light absorber for PEC hydrogen production. In this article, hierarchical porous Cu 2 O foams are prepared by thermal oxidation of the electrochemically deposited Cu foams. PEC performances of the Cu 2 O foams are systematically studied and discussed. Benefiting from their higher light harvesting and more efficient charge separation, the Cu 2 O foams demonstrate significantly enhanced photocurrents and photostability compared to their film counterparts. Moreover, by integrating g-C 3 N 4 , hierarchical Cu 2 O foam/g-C 3 N 4 composites are prepared with further improved photocurrent and photostability, appearing to be potential photocathodes for solar PEC hydrogen production. This study may provide a new and useful insight for the development of Cu 2 O-based photocathodes for PEC hydrogen production.
研究领域:
材料科学
·
可再生能源
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Junzheng Zhang,Jingjing Shi,Sheng Tao,Lei Wu,Jun Lu
Photocatalytic CO 2 reduction has been viewed as a promising approach to relieve the energy crisis and green-house effect. Cheap and high performance cocatalyst is an effective approach to enhance the photocatalytic activity . Ti 3 C 2 T x (MXene) is a new family of 2D layered materials, which can be served as an electron conductor. In this work, Cu 2 O/Ti 3 C 2 T x heterojunction composites were prepared by in situ hydrothermal growth method. Cu 2 O/Ti 3 C 2 T x with the different percentages of ultrathin Ti 3 C 2 T x (2, 5, 10, 20 and 30 mg) nanosheet in the heterostructured catalysts are noted as CuTi-X (X = 2, 5, 10, 20, 30). As prepared CuTi-10 exhibits the highest photocatalytic CO 2 reaction activity (17.55 μmol·g −1 ·h −1 for CO and 0.96 μmol·h −1 ·g −1 for CH 4 ), which is 3.1 and 4.0 times higher than that of pure Cu 2 O (5.73 μmol·g −1 ·h −1 for CO and 0.24 μmol·g −1 ·h −1 for CH 4 , respectively). The advantage of the in situ growth endows the Cu 2 O/Ti 3 C 2 T x heterojunction contact interface, which is conductive to the separation of photogenerated electrons-hole pairs. The main reason is analysed and can be attributed to that Ti 3 C 2 T x can served as an electron acceptor due to its excellent conductive properties, rendering that more photo generated electrons attend the CO 2 reduction reaction. This provides a strategy to construct the Cu 2 O/Ti 3 C 2 T x heterojunction for photocatalytic CO 2 reduction.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）