Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Yuanfeng Wu,Xianghai Song,Jiahui Zhang,Shuai Li,Xinghui Yang,Huazheng Wang,Ruiping Wei,Lijing Gao,Jin Zhang,Guomin Xiao
A series of Ce 1- x Cd x O mixed oxide catalysts prepared by co-precipitation method were tested for synthesis of glycerol carbonate (GC) from glycerol and diethyl carbonate (DEC). The microstructural and physicochemical properties of the bimetal catalysts were characterized by XRD, SEM, TEM, XPS, CO 2 -TPD, N 2 -adsorption, TG-DSC and 1 H NMR. The results show that the spherical particles of CdO were uniformly dispersed on the surface of lamellar CeO 2 . Besides, a noticeable increase was observed in the moderate basic sites concentration, because more oxygen atoms were adsorbed on the bimetal sample surface which was attributed to Ce 4+ doped into CdO lattice. The Ce 0.7 Cd 0.3 O sample annealed at 500 °C was observed with the highest catalytic activity. 96.84% of glycerol conversion and 100% selectivity to GC were obtained over this catalyst under the optimized conditions (5 wt.% catalyst of glycerol, 90 °C, 180 min, glycerol/DEC molar ratio of 1:3). Besides, it was found that the conversion of glycerol carbonate was synergistically accelerated by the moderate and strong basic sites.
研究领域:
催化化学
·
材料科学
·
绿色化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 25
·17362-17369
·
IF 3.9
Zhe Zhang,Fanhao Kong,Bizhen Yuan,Yinnian Liao,Xiue Ren,Yu Hou
Solar-driven CO2 reduction into fuels and sustainable energy has attracted increasing attention around the world. However, the photoreduction efficiency remains low due to the low efficiency of separation of electron–hole pairs and high thermal stability of CO2. In this work, we prepared a CdO decorated CdS nanorod for visible light driven CO2 reduction. The introduction of CdO facilitates the photoinduced charge carrier separation and transfer and acts as an active site for adsorption and activation of CO2 molecules. Compared with pristine CdS, CdO/CdS exhibits a nearly 5-fold higher CO generation rate (1.26 mmol g−1 h−1). In situ FT-IR experiments indicated that CO2 reduction on CdO/CdS may follow a COOH* pathway. This study reports the pivotal effect of CdO on photogenerated carrier transfer in photocatalysis and on CO2 adsorption, which provides a facile way to enhance photocatalytic efficiency.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Ting-ting Yu,Xian-Fa Zhang,Ying-Ming Xu,Xiao-Li Cheng,Shan Gao,Hui Zhao,Li-Hua Huo
CdO-decorated hierarchically mesoporous NiO nanofilm with wrinkle structure was grown in-situ on ceramic tubes via a simple hydrothermal reaction without any surfactant or template. The as-prepared nanofilm was characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) and Brunauer–Emmett–Teller (BET) analyzes. It exhibits a nanoparticulate film with uniformly self-assembled wrinkles. These wrinkles are thin porous nanosheets that are further constructed by subnanometer nanoparticles . Compared with the NiO porous nanowall arrays, the 2.01 mol% CdO-decorated NiO film exhibits not only higher response to part per billion (ppb) levels (0.5–100 ppb) H 2 S at low temperature (92 °C), but also higher selectivity to other reducing gases compared with pure NiO porous nanowall arrays. The lowest detection limit of the NiO film after CdO decoration decreases down to 0.5 ppb while that of pure NiO is 1 ppb. The mechanism of the enhanced H 2 S sensing for 2.01 mol% Cd-decorated NiO film is also discussed in detail.
研究领域:
材料科学
·
化学传感器
✓ 已验证
产品关联
DOI
高影响因子
Chem Catalysis
·
2022
·
IF 0
Zhe Zhang,Min Wang,Feng Wang
Summary Heterojunction is promising to promote the spatial charge separation while the poor lattice mismatches and the bulk size of semiconductors constrain the photocarrier separation and migration to the surface. Herein, we report the surface oxidative reconstruction of CdS to form CdO quantum dots (QDs)/CdS intimate heterojunction. We developed a plasma-assisted method to prepare CdO-QDs/CdS heterojunction where CdS(200) and CdO(111) are tilted with a dihedral angel of 159° to form a semi-coherent interface, maximally reducing the interface dangling bonds. The semi-coherent interface and the quantum size of CdO-QDs efficiently promotes charge separation and migration to the surface, accelerating the photocatalytic bio-CO evolution. With glycerol as feedstock, the CO generation rate over CdO-QDs/CdS reaches 2.37 mmol g −1 ·h −1 , which is 4-fold of that over CdS. The present work reports a new method for the preparation of CdO-QDs/CdS intimate heterojunction and gives insight into tuning lattice coherency to promote photocarrier separation.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 20
·17533-17541
·
IF 2.324
Zeng Xiangan,Wang Zhijun,Li Yu,Li Haiying,Xu Suyang,Liu Li,Gong Yimin,Liang Qingcheng,Duan Haojie,Cheng Yali,Du Liting
Pure In 2 O 3 nanowires (PINW) and CdO–In 2 O 3 composited beaded porous nanotubes (CIBPNT) were successfully prepared by conventional electrospinning method and followed by calcination. The peculiar surface morphological images of as-synthesized nanomaterials were observed via scanning electron microscope (SEM) and transmission electron microscopy (TEM) from which we could observe a series of irregular holes distributed on the surface of beaded nanotubes. The inner structure of the samples was investigated using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results reveal that the element composition of the samples are in conformity with the CdO–In 2 O 3 materials. In addition, the average crystallite size of CIBPNT (17.5 nm) can be estimated from XRD which accords with the TEM images, and XPS analysis supports the oxygen vacancy principle by proving the oxygen vacancies concentration of CIBPNT is more than in PINW. The formaldehyde sensing performances of the samples were evaluated at different temperatures. The result shows that the sensor based on CIBPNT exhibits a excellent response (72–50 ppm formaldehyde) at a low operation temperature of 132 °C, and the value is eight times that of the response of PINW (9 to 50 ppm formaldehyde).The sensor based on CIBPNT could detect 0.1 ppm formaldehyde with a response of 2. In addition, good selectivity and a short response and recovery time (6 s, 12 s) are exhibited. The enhancement of gas sensitivity is attributed to not only the unique beaded shape of hollow and porous 1D nanostructures, but also the high catalytic activity of the CdO additive.
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
ACS Omega
·
2018
·
IF 0
Pu Sun,Ruping Liu,Ruifang Ma,Zhengdao Xie,Fan Su,Yanfang Gong,Zeming Mu,Luhai Li,Yen Wei,Qiang Wan
Branched nanostructures of semiconductors based on one-dimensional heterostructures have many promising applications in optoelectronics, supercapacitors, photocatalysts, etc. Here, we report a novel branched core/shell CdO/ZnO hetero-nanostructure that resembles a Crimson bottlebrush (Callistemon Citrinus) but with intriguing hexagonal symmetry. The nanomaterials were fabricated via an improved one-step chemical vapor deposition method and consist of a CdO wire as the core and ZnO as the shell. With cadmium acting as a catalyst, ZnO nanowires grow as perpendicular branches from the CdO/ZnO one-dimensional core/shell structure. The nanostructures were characterized with X-ray diffraction scanning and transmission electron microscopy. A homogeneous epitaxial growth mechanism has been postulated for the formation of the nanostructure. The materials show a broad and strong absorption ranging from visible to ultraviolet and a better photoelectrocatalytic properties in comparison to pure ZnO or CdO. Our synthetic strategy may open up a new way for controlled preparation of one-dimensional nanomaterials with core/shell heterostructure, which could find potential applications in solar cells and opto-electrochemical water-splitting devices.
研究领域:
材料科学
·
纳米技术
·
光电化学
·
太阳能
✓ 已验证
产品关联
DOI
PubMed
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Xinxin Xing,Yue Yang,Zhiyong Yan,Ying Hu,Tong Zou,Zidong Wang,Yude Wang
In this work, CdO-Ag-ZnO nanocomposites with hierarchically porous structure and large surface area were successfully fabricated by solution combustion synthesis (SCS) method. Crystalline structure, morphology, surface chemical states and specific surface area were investigated by XRD , SEM, TEM, XPS and BET techniques, respectively. Sensors fabricated from CdO-Ag-ZnO nanocomposites were made based on indirect heating method, which showed superior sensing properties in detecting different concentration of volatile organic compounds (VOCs). In contrast with singular ZnO, gas-sensing experiment results reveal that the addition of CdO and Ag effectively decreases optimum working temperature, increases gas response value and shortens response and recovery time. What’s more, other gas-sensing properties including repeatability, sensitivity and long-term stability are also discussed in this research. Particularly, gas sensor based on 10 mol% CdO-Ag-ZnO shows modest gas-sensing performance to VOCs at the operating temperature of 200 °C, and its gas response values are 198.63, 156.07, 53.04, 64.23, 183.65 towards 100 ppm formaldehyde, ethanol, acetone, methanol and isopropanol, respectively, indicating it a promising candidate in detecting VOCs. Superior sensing property is mainly ascribed to large specific surface area, special porous surface morphology, unique combination of nanocomposites and good catalytic ability of metallic Ag.
研究领域:
材料科学
·
纳米技术
·
气体传感
·
环境监测
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Bo Huang,Hsueh-Liang Chu,Moo-Chin Wang,Cheng-Li Wang,Weng-Sing Hwang,Chao Liu,Horng-Huey Ko,Xiujian Zhao
Crystallization kinetics evaluated by the modified formula and optical properties of CdO and ZnO in 0.5ZnO-0.5CdO thin films have been investigated. The characterization used grazing incidence X-ray diffraction (GIXRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), high-resolution TEM (HRTEM) and ultraviolet–visible (UV–Vis) spectrophotometry. When the thin films are annealed at temperatures from 573 K to 773 K for 10–60 min, the GIXRD results show that all the films are composed of CdO and ZnO as major and second phases, respectively. In addition, a trace phase of CdSiO 3 appeared for thin films annealed at 723 K and 773 K for 45 and 60 min, respectively, while CdSiO 3 also appeared when annealing at 773 K for 30 min. The crystallinity of CdO increases with annealing temperature and duration, whereas the crystallinity of ZnO increases only slightly with temperature and duration. The activation energies of ZnO and CdO crystallization in 0.5ZnO-0.5CdO thin films are 49.51 kJ/mol and 112.45 kJ/mol, respectively. The crystallization of CdO and ZnO can be described by a modified formula: ln ( 1 1 − α ′ ) = [ 30 t × exp ( − 49.51 × 10 3 R T ) ] 0.24 and ln ( 1 1 − α ′ ) = [ 104820 t × exp ( − 112.45 × 10 3 R T ) ] 0.27 , for 573 K ≤ T ≤ 773 K and 10 min ≤ t ≤ 60 min, respectively. All films have an average optical transparency of nearly 80% in the wavelength range greater than 500 nm in the visible range, and the band gap energy of the thin films increases from 2.68 eV to 3.10 eV as the crystallinity of ZnO increases from 5.12% to 20.91% when the thin films are annealed for 60 min at 573 K–773 K and shows a blueshift effect.
研究领域:
材料科学
·
固体物理学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Huan Wen,Shu Chen,Jian Zuo,Jie Zhang,Canjun Liu,Yang Liu,Keke Wang,Hezhang Chen,Yong Pei
The primary challenge in enhancing the efficiency of solar energy conversion lies in improving the charge separation efficiency for photocatalytic (PC)/photoelectrochemical (PEC) processes, and the construction of heterojunctions represents one of the most effective strategies for promoting charge separation in the bulk phase. However, further investigation is necessary to elucidate the impact of the heterojunction interface structure on charge separation. In this paper, CdS/CdO and CdO/CdS films were prepared using an in-situ phase transformation approach to achieve a well-defined heterojunction interface structure for comparison. The research findings reveal significant disparities in the initiation potential and charge separation efficiency between CdS/CdO and CdO/CdS, with CdS/CdO exhibiting superior PEC properties. Notably, the photocurrent density of CdS/CdO reaches 6.5 mA cm −2 at 1.23 V RHE . This can be attributed to the fact that the favorable alignment of the built-in electric field (BEF) in CdS/CdO with the applied bias direction facilitates efficient charge separation and transmission at the heterojunction interface, as supported by the experimental results, density functional theory (DFT) calculations and finite element analysis (FEA). This finding offers a novel insight for the design and fabrication of high-performance heterojunction photocatalysts and photoelectrocatalysts.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2015
·Vol. 98
·期 10
·3285-3290
·
IF 2.61
Linjie Gao,Shengjun Zhai,Ran Liu,Nian Fu,Jianglong Wang,Guangsheng Fu,Shufang Wang
Polycrystalline Cd 1− x Ba x O (0 ≤ x ≤ 0.08) ceramics were synthesized via conventional solid-state reaction method, and the effect of Ba 2+ doping on the microstructure as well as the thermoelectric transport properties of the samples were investigated. It was found that doping of Ba 2+ can inhibit the grain growth of CdO, resulting in a considerable reduction in grain size. Moreover, with the increase in Ba 2+ doping content, both the electrical conductivity and the thermal conductivity of Cd 1− x Ba x O decreased, whereas the Seebeck coefficient increased. A high ZT value of 0.47 was achieved for Cd 0.99 Ba 0.01 O at 1000 K, 38% higher than the undoped CdO, mostly due to reduction of the thermal conductivity.
研究领域:
材料科学
·
热电学
·
陶瓷
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Huixuan Chen,Jiayu Li,Siwen Tao,Xinhua Tian,Xikun Sun,Ruiqin Gao,Ni Bai,Guo-Dong Li
Developing fast, accurate and sensitive triethylamine gas sensors with low detection limits is paramount to ensure the safety of workers and the public. However, sensors based on single metal oxide materials still suffer from drawbacks such as low response sensitivity and long response and recovery times. To address these challenges, in this work, a series of mesoporous CdO/CdGa 2 O 4 microspheres were synthesized. We optimized the sensor's sensing performance to triethylamine by fine-tuning the ratio of CdO to CdGa 2 O 4 . Among them, CdO:3CdGa 2 O 4 -based sensor demonstrates a rapid response time of 2 s to detect 100 ppm of triethylamine, with a high response value of 211 and exceptional selectivity. Furthermore, it exhibits a low detection limit of 20 ppb for triethylamine, making it suitable for practically testing fish freshness. Crucially, electron transfer between the heterojunctions increases the chemically adsorbed oxygen on the materials’ surface, thereby enhancing the sensor's response sensitivity to triethylamine. This discovery provides new insights and methodologies for the design of highly efficient triethylamine gas sensors.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Bo Huang,Hsueh-Liang Chu,Moo-Chin Wang,Chao Liu,Weng-Sing Hwang,Xiujian Zhao
The phase formation, growth kinetics and optical properties of 0.5ZnO-0.5CdO thin films have been investigated by X-ray diffraction (XRD) and UV–vis spectrophotometry. The XRD results show that all 0.5ZnO-0.5CdO thin films are composed of CdO as the major phase and ZnO as the secondary phase. Moreover, after annealing of the 0.5ZnO-0.5CdO thin films at 723 K for 45 min and 773 K for 30 min, the minor phase of CdSiO 3 also appeared. The average activation energy of CdO grain growth in 0.5ZnO-0.5CdO thin films by the isothermal method is 10.51±1.17 kJ/mol. The average optical transparency was nearly 80% for the wavelength range from 500 nm to 900 nm. The grain size of CdO on the band gap energy for 0.5ZnO-0.5CdO thin films after annealing has a critical value, namely 15.9 nm. When the grain size of CdO is smaller than 15.9 nm, the band gap energy decreases, showing a redshift effect. Conversely, the band gap energy increases when the grain size of CdO is greater than 15.9 nm, showing a blueshift effect.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
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