Micro & Nano Letters
·
2018
·Vol. 13
·期 10
·1382-1385
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IF 0.841
Xin Xiao,YiHui Wang,DongEn Zhang,JunYan Gong,Ying Zhang,JuanJuan Ma,Tao Yang,ZhiWei Tong
Highly uniform columnar-shaped CeO 2 was successfully prepared in large quantities by calcining a precursor, which was prepared by a simple hydrothermal method. The structure and morphology of the precursor and the columnar CeO 2 were characterised by X-ray diffraction and scanning electron microscopy. The columnar CeO 2 was fixed on a glassy carbon electrode to obtain a columnar CeO 2 sensor for detection of phenol. The anodic peak current was proportional to the phenol concentration in the range of 0.005–0.225 mmol l −1 ( R = 0.995) and 0.225–1.125 mmol l −1 ( R = 0.998) with the detection limit of 0.9 μmol l −1 . This electrochemical method has the advantages of simplicity and ease of fabrication, rapid detection, low cost of the apparatus and wide dynamic ranges.
研究领域:
材料科学
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环境科学
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电化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Shuaishuai Lu,Jingde Zhang,Yuanyuan Sun,Huichao Liu
CuO-CeO 2 -ZrO 2 /cordierite catalysts have been successfully prepared by the impregnation reduction method. The effects of processing parameters such as the condition of reduction process, calcination temperature, the addition of surfactant on the size and shape of catalyst particles were studied by X-ray diffraction (XRD), BET surface area measurements, and scanning electron microscopy (SEM). The catalytic performance of the as-prepared catalysts for CO oxidation were evaluated by using a microreactor-GC system. The results indicate that the processing parameters influence greatly the size and shape of catalyst particles. Fragmental shape catalysts were formed when the impregnated samples were reduced in the thermostat water bath. However, spherical-like particles were obtained by ultrasonic-assisted in the reduction process. Tiny flower-like catalyst particles were found when the surfactant were used. When the calcination temperature decreased, the grain size of catalysts has reduced, and the catalytic activity for CO oxidation has been improved. The introduction of ultrasonic and surfactant resulted in larger specific surface area and better catalytic performance.
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
MACROMOLECULAR CHEMISTRY AND PHYSICS
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2024
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IF 2.5
Cansen Liu,Qingmei Chen,Canhai Cai,Jianyu Xu
Developing ecofriendly anticorrosion coating has great demand for marine protection. Incorporation of nontoxic inorganic fillers into waterborne epoxy (WEP) coating shows tremendous potential for enhancing corrosion resistance. However, the application of MXene/WEP coating is limited by the poor dispersion of MXene in WEP and insufficient corrosion resistance. Herein, a polydopamine (PDA) modified MXene-CeO 2 @PDA (MCP) filler is constructed by a combination of CeO 2 with MXene and embedded into WEP to form ecofriendly anticorrosion MCP/WEP coating. Dispersion of MXene in WEP is improved by the introduction of CeO 2 and PDA modification. Benefiting from the synergy of the physical labyrinth effect of MXene and the chemical inhibition effect of CeO 2 , MCP/WEP coating exhibits remarkable anticorrosion behavior in 3.5 wt% NaCl solution with a low corrosion rate (CR) of 4.48 × 10 −6 mpy, which is three orders of magnitude lower than that of blank WEP (4.78 × 10 −3 mpy). Moreover, MCP/WEP presents long-term and stable corrosion protection for over 30 days. The results reveal the incorporation of MCP significantly promotes the anticorrosion performance of WEP.
研究领域:
材料科学
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腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jing Xu,Qian Li,Zezhong Li,Zhenlu Liu,Yan Shang
The Mn 0.2 Cd 0.8 S/CeO 2 heterojunction is synthesized by means of hydrothermal coupling. Short rod-like Mn 0.2 Cd 0.8 S is wrapped in leaf like CeO 2 to construct a tight heterointerface, which stimulated the photocatalytic activity to the great extent. Due to the remarkable catalytic and electrochemical properties of Mn 0.2 Cd 0.8 S, the CeO 2 surface active site is driven. CeO 2 has excellent specific surface area, suitable pore volume aperture and Mn 0.2 Cd 0.8 S match to optimize the internal interface charge transfer path. At the same time, the heterointerface can coordinate the interface electron flow and promote the H 2 reduction ability. The results show that the optimal hydrogen production of Mn 0.2 Cd 0.8 S/CeO 2 with S-type heterostructure is 291.8 μmol, and the internal lattice and surface morphology of Mn 0.2 Cd 0.8 S/CeO 2 are not easily damaged due to good catalytic stability. The photocatalytic mechanism of Mn 0.2 Cd 0.8 S/CeO 2 is studied by finding the short distance interfacial charge transfer path and enriching the photogenerated electrons required for hydrogen evolution.
研究领域:
材料科学
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能源科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
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2024
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IF 4.8
Dayu Liang,Xiang Li,Yixiang Zhang,Jianlei Qi,Zhimin Lu
In this paper, carboxyl-terminated nitrile rubber (CTBN) and Nano cerium oxide (n-CeO 2 ) were used to toughen epoxy resin (EP), and the effects of toughening agents on the mechanical and thermal properties of EP were studied. Orthogonal experiments determined that the ideal toughener proportions are 20 wt% CTBN and 1 wt% n-CeO 2 , under which the resin demonstrated superior mechanical characteristics. The combined application of CTBN and n-CeO 2 significantly enhanced the resin's mechanical properties, surpassing the effects of individual particle toughening. Compared with pure EP, the impact, flexural, and tensile strengths of the resin-cured product synergistically toughened by CTBN and n-CeO 2 increased by 462%, 136%, and 110%, respectively, and the flexural and Young's moduli increased by 38% and 35%, respectively. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) were used to characterize the cured resin. The results indicate that incorporating CTBN and n-CeO 2 reduces the reaction activation energy, thereby accelerating the curing reaction and facilitating its progression. The addition of nanoparticles enhances the maximum weight loss temperature of the cured resin, thereby improving its thermal stability. CTBN and n-CeO 2 particles create a uniform phase separation structure within the resin, enhancing its toughness and strength. Furthermore, the impact fracture mode of the cured resin transitions from brittle to tough fracture, demonstrating a significant toughening effect. This provides an effective method for the toughening modification of EP. Highlights The synergistic use of CTBN and n-CeO 2 enhances the toughness of EP. The incorporation of nanoparticles improves the thermal stability of the cured resin. The addition of CTBN and n-CeO 2 accelerates the curing reaction rate. The inclusion of toughening agents transforms the fracture mode of the cured resin from brittle to tough fracture.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Pan Min,Shizheng Zhang,Yaohui Xu,Ruixing Li
Doping CeO 2 with certain metallic ions has been shown to be an effective route to improving its oxygen storage capacity (OSC). We aimed to study the effects of dopants on the OSC of CeO 2 from the perspective of crystallography. In the present study, we improved the OSC by construction of an extremely unstable CeO 2 crystal structure based on crystallographic principles. By doping CeO 2 with smaller Hf 4+ and Sn 4+ cations, the incorporated cations produced a lower cation to anion radius ratio in the crystal. The relative oxygen vacancy concentrations were 0.452 and 0.514, respectively, for 3 mol.% doping of Hf 4+ and Sn 4+ , respectively. Our results showed that smaller dopant cations (radius of Sn 4+ < Hf 4+ ) led to more vacancies. The low temperature OSC of a CeO 2 sample doped with a saturated amount of Hf 4+ was 2.2 times as high as that of undoped CeO 2 with a similar BET specific surface area. The partial least squares method was used to construct two linear functions for the Hf 4+ - and Sn 4+ -doping concentration vs. lattice parameters, and the relative oxygen vacancy concentration vs. low temperature OSC per BET surface area. Structure-performance relationships were developed to enable the design of CeO 2 three-way catalysts.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
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2023
·Vol. 13
·期 5
·821
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IF 3.9
Xiaowang Lu,Wenxuan Chen,Haijun Hou,Junchao Qian,Qinfang Zhang
A two-dimensional layered CeO2/Bi2O3composite was synthesized by microwave solvothermal method. X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), UV-Vis diffuse reflection spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS) were used to studied crystal structure, morphology, optical performance, elemental composition and the surface electronic state of the samples. The photocatalytic properties of the prepared samples were evaluated by photocatalytic desulfurization under visible light. When the molar ratio of Ce and Bi was 1:2, CeO2/Bi2O3composite presented the highest photocatalytic desulfurization rate. Transient Photocurrent measurement, electrochemical impedance spectroscopy (EIS) and photoluminescence spectroscopy (PL) showed that CeO2and Bi2O3formed a heterojunction, which could promote the separation of photogenerated electrons and holes, improving the photocatalytic activity. Furthermore, it was found that the active species of hydroxyl radical (·OH) played an important role in the photocatalytic degradation of dibenzothiophene (DBT) based on the active species capture experiment. Finally, a plausible mechanism for the photocatalytic oxidative desulfurization of this nanocomposite was proposed.Keywords:CeO2;Bi2O3;composite;heterojunction;photocatalytic desulfurization
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
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2023
·Vol. 29
·期 1
·1
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IF 4.6
Chunyuan Tian,Feiyan Tang,Wei Guo,Minggang Wei,Li Wang,Xuming Zhuang,Feng Luan
The excessive concentration of heavy-metal mercury ions (Hg2+) in the environment seriously affects the ecological environment and even threatens human health. Therefore, it is necessary to develop rapid and low-cost determination methods to achieve trace detection of Hg2+. In this paper, an Electrochemiluminescence (ECL) sensing platform using a functionalized rare-earth material (cerium oxide, CeO2) as the luminescent unit and an aptamer as a capture unit was designed and constructed. Using the specific asymmetric matching between Hg2+and thymine (T) base pairs in the deoxyribonucleic acid (DNA) single strand, the “T−Hg−T” structure was formed to change the ECL signal, leading to a direct and sensitive response to Hg2+. The results show a good linear relationship between the concentration and the response signal within the range of 10 pM–100 µM for Hg2+, with a detection limit as low as 0.35 pM. In addition, the ECL probe exhibits a stable ECL performance and excellent specificity for identifying target Hg2+. It was then successfully used for spiked recovery tests of actual samples in the environment. The analytical method solves the problem of poor Hg2+recognition specificity, provides a new idea for the efficient and low-cost detection of heavy-metal pollutant Hg2+in the environment, and broadens the prospects for the development and application of rare-earth materials.Keywords:CeO2;electrochemiluminescence;mercury ions;aptamer;environment
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2020
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IF 6.215
Weili Li,Zhongxin Song,Xiaohui Deng,Xian-Zhu Fu,Jing-Li Luo
High-performance and low-cost electrocatalysts for electrochemical methanol oxidation reaction (MOR) are essential for the wide application of direct methanol fuel cells (DMFC). Herein, CeO 2 –NiO composites with CeO 2 nanoparticles homogeneously supported on the surface of NiO hollow spheres composed of stacked nanosheets are synthesized via a facile two-step route and tested as noble-metal-free electrocatalysts towards methanol oxidation in alkaline solution. Optimal loading of CeO 2 nanoparticles with a uniform size of ∼8 nm greatly enhances the electrocatalytic activity and stability comparing with pristine NiO hollow spheres for MOR. It is proposed that a synergistic effect resulting from the proper loading content and high dispersion of CeO 2 nanoparticles on the surface of NiO nanosheets boosted the formation of active NiOOH species, which enhanced the electrocatalytic activity and stability of CeO 2 –NiO catslysts for MOR. CeO 2 nanoparticles exhibit good promotion effect as co-catalyst in electrocatalysis , and CeO 2 –NiO nanocomposites show potential as inexpensive anode catalysts for DMFC applications .
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
ChemCatChem
·
2018
·Vol. 11
·期 3
·1069-1075
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IF 4.674
Rui Tong,Zhi Sun,Xiongwei Zhong,Xina Wang,Jincheng Xu,Ye Yang,Baomin Xu,Shuangpeng Wang,Hui Pan
Graphical Photocatalytic hydrogen production : g-C 3 N 4 /CeCO 3 OH/CeO 2 ternary composite showed greatly enhanced photocatalytic performance for hydrogen production under visible light irradiation. Promoting the separation of photo-generated carriers is significantly important to improve the efficiency of photocatalytic hydrogen production. Therefore, we prepared g-C 3 N 4 /CeCO 3 OH/CeO 2 (CeCeCN) ternary nanocomposite via an easy synthetic way using g-C 3 N 4 and CeO 2 as reactants. A CeCO 3 OH layer was formed and resulted in the novel ternary photocatalyst. The CeCeCN composite shows superior photocatalytic (PC) H 2 generation performance in sunlight excitation. The H 2 evolution rate is about 764 μmol h −1 g −1 , which is over 11 times larger than those of g-C 3 N 4 and CeO 2 . Compared with g-C 3 N 4 and CeO 2 , CeCeCN further shows a larger photo-response current density and a lower charge-transfer resistance. The remarkably increased photocatalytic property of CeCeCN is because of the efficient charge migration induced by the formed heterojunction. Our findings demonstrate that building multi-heterostructures can liberate more excited electrons for efficient hydrogen production under sunlight.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
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IF 4.6
Shanshan Wu,Meng Tian,Yang Hu,Nan Zhang,Wei Shen,Jianyi Li,Linchuan Guo,Pengfei Da,Pinxian Xi,Chun-Hua Yan
Formate is identified as economically viable chemical fuel from electrochemical carbon dioxide reduction. However, the selectivity of current catalysts toward formate is limited by the competitive reaction such as HER. Herein, we propose a CeO2 modification strategy to improve the selectivity of catalysts for formate through tuning of the *OCHO intermediate, which is important for formate production.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS
·
2021
·Vol. 21
·期 24
·8269
·
IF 3.576
Kai Sun,Guanghui Zhan,Hande Chen,Shiwei Lin
CeO2/ZnO-heterojunction-nanorod-array-based chemiresistive sensors were studied for their low-operating-temperature and gas-detecting characteristics. Arrays of CeO2/ZnO heterojunction nanorods were synthesized using anodic electrodeposition coating followed by hydrothermal treatment. The sensor based on this CeO2/ZnO heterojunction demonstrated a much higher sensitivity to NO2at a low operating temperature (120 °C) than the pure-ZnO-based sensor. Moreover, even at room temperature (RT, 25 °C) the CeO2/ZnO-heterojunction-based sensor responds linearly and rapidly to NO2. This sensor’s reaction to interfering gases was substantially less than that of NO2, suggesting exceptional selectivity. Experimental results revealed that the enhanced gas-sensing performance at the low operating temperature of the CeO2/ZnO heterojunction due to the built-in field formed after the construction of heterojunctions provides additional carriers for ZnO. Thanks to more carriers in the ZnO conduction band, more oxygen and target gases can be adsorbed. This explains the enhanced gas sensitivity of the CeO2/ZnO heterojunction at low operating temperatures.Keywords:gas sensor;NO2detection;heterojunction;low operating temperature;CeO2
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）