Materials
·
2022
·Vol. 15
·期 24
·8971
·
IF 3.748
Yaohui Xu,Liangjuan Gao,Zhao Ding
Doping CeO2with Y cations was achieved in this study using three strategies: doping only during the hydrothermal process (H-Y-doped CeO2), doping only during the impregnation process (I-Y-doped CeO2), and doping during both the hydrothermal and impregnation processes (H/I-Y-doped CeO2). During the three synthesis strategies of Y-doped CeO2, these Y ions could be incorporated into the CeO2lattice in the +3 state while holding the cubic fluorite structure, and no impurity phases were detected. Pure CeO2crystal itself contained a certain number of intrinsicVOdefects, and Y-doping was beneficial for the creation of extrinsicVOdefects. The relative concentrations ofVOdefects were quantified by the values ofA592/A464obtained from Raman spectra, which were 1.47, 0.93, and 1.16 for the H-Y-, I-Y-, and H/I-Y-doped CeO2, respectively, and were higher than that of the undoped one (0.67). Moreover, the OSCs of the three Y-doped CeO2were enhanced, and the sequence of OSCs was: H-Y-doped CeO2(0.372 mmol/g) > H/I-Y-doped CeO2(0.353 mmol/g) > I-Y-doped CeO2(0.248 mmol/g) > Undoped CeO2(0.153 mmol/g); this result was in good agreement with the Raman spectroscopy results.Keywords:CeO2;rare-earth;doping;hydrothermal;impregnation;oxygen storage capability
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
Materials
·
2023
·Vol. 16
·期 15
·5478
·
IF 3.4
Yaohui Xu,Liangjuan Gao,Pingkeng Wu,Zhao Ding
A cubic fluorite-type CeO2with mesoporous multilayered morphology was synthesized by the solvothermal method followed by calcination in air, and its oxygen storage capacity (OSC) was quantified by the amount of O2consumption per gram of CeO2based on hydrogen temperature programmed reduction (H2–TPR) measurements. Doping CeO2with ytterbium (Yb) and nitrogen (N) ions proved to be an effective route to improving its OSC in this work. The OSC of undoped CeO2was 0.115 mmol O2/g and reached as high as 0.222 mmol O2/g upon the addition of 5 mol.% Yb(NO3)3∙5H2O, further enhanced to 0.274 mmol O2/g with the introduction of 20 mol.% triethanolamine. Both the introductions of Yb cations and N anions into the CeO2lattice were conducive to the formation of more non-stoichiometric oxygen vacancy (VO) defects and reducible–reoxidizable Cen+ions. To determine the structure performance relationships, the partial least squares method was employed to construct two linear functions for the doping level vs. lattice parameter and [VO] vs. OSC/SBET.Keywords:CeO2;doping;solvothermal;oxygen storage capacity;porous
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Huanyu Zhou,Xiaolian Jiang,Qing Han,Minghui Qiu,Xiaowei Da,Xianfu Chen,Yiqun Fan
To achieve precise separation of bioactive molecules, an innovative strategy combining sonochemistry and in-situ ion assistance process was proposed to fabricate CeO 2 mesopore membranes with narrow pore size around 3.7 nm. Under the ultrasound cavitation, the precursors and the precipitants react uniformly at molecular scale. The residual appropriate in-situ ions dispersed around the cluster form a double electric layer, thereby enhancing the stability of the sol. During sintering, ions between the clusters generate CeO 2 , reinforcing particle neck connections while the confined space between particles restricts further CeO 2 particle growth. The resulting CeO 2 membranes possess characteristics of a single fluorite phase, high crystallinity, and narrow pore size distribution. The optimal membrane thickness of 380 nm could be formed by a 2x dilution of sol and a 30-second coating time, exhibiting a complete structure with no obvious defects. The membrane achieved a molecular weight cut-off (MWCO) of ∼4300 Da, a pure water permeance of 61 L·m -2 ·h -1 ·bar -1 , an average pore size of 3.7 nm and a roughness of 3.4 nm. In chitosan oligosaccharides (COS) preparation using cellulase, the CeO 2 membranes demonstrated 100% cellulase retention and ∼50% transmission of COS with the degree of polymerization (DP) ranging from 2 to 5, thus achieving precise separation.
研究领域:
材料科学
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生物分离工程
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2014
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IF 3.552
Zhisong Lu,Cuiping Mao,Mei Meng,Sangui Liu,Yunli Tian,Ling Yu,Bai Sun,Chang Ming Li
To endow silk with UV-shielding ability and antibacterial activity, CeO 2 nanoparticles were immobilized on silk surface via a dip-coating approach without changing silk structure. Surface density of the nanoparticles could be easily adjusted by controlling the number of dip-coating cycle. Enhanced thermal stability of the modified silk is exhibited in thermogravimetric analysis (TGA) and derivative thermogravimetric analysis (DTG). The excellent UV-protection ability and antibacterial property of the CeO 2 nanoparticle-coated silk are demonstrated in UV–vis diffuse reflectance spectroscopy and colony-forming capability test, respectively. Based on the data, it can be concluded that CeO 2 nanoparticles could be used as a very promising coating material to modify silk for UV-protection and antibacterial applications.
研究领域:
材料科学
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纺织工程
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纳米技术
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DOI
PubMed
高影响因子
Scientific Reports
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2016
·Vol. 6
·期 1
·1-7
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IF 5.228
Yang Yushi,Mao Zhou,Huang Wenjie,Liu Lihua,Li Junli,Li Jialiang,Wu Qingzhi
CeO 2 nanoparticles (NPs) have been well demonstrated as an antioxidant in protecting against oxidative stress-induced cellular damages and a potential therapeutic agent for various diseases thanks to their redox enzyme-mimicking activities. The Ce 3+ /Ce 4+ ratio and oxygen vacancies on the surface have been considered as the major originations responsible for the redox enzyme-mimicking activities of CeO 2 NPs. Herein, CeO 2 nanostructures (nanocubes and nanorods) exposed different facets were synthesized via a facile hydrothermal method. The characterizations by X-ray photoelectron spectroscopy, Raman spectroscopy, and UV-Vis spectroscopy show that the Ce 3+ /Ce 4+ ratio and oxygen vacancy content on the surfaces of as-synthesized CeO 2 nanostructures are nearly at the same levels. Meanwhile, the enzymatic activity measurements indicate that the redox enzyme-mimicking activities of as-synthesized CeO 2 nanostructures are greatly dependent on their exposed facets. CeO 2 nanocubes with exposed {100} facets exhibit a higher peroxidase but lower superoxide dismutase activity than those of the CeO 2 nanorods with exposed {110} facets. Our results provide new insights into the redox enzyme-mimicking activities of CeO 2 nanostructures, as well as the design and synthesis of inorganic nanomaterials-based artificial enzymes.
研究领域:
生物材料学
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纳米医学
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催化酶学
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DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 11
·期 5
·1914-1921
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IF 5.721
Xiaoxiao Qin,Xueyan Chen,Min Chen,Jianghao Zhang,Hong He,Changbin Zhang
Formaldehyde (HCHO) elimination at low temperature is of great interest for indoor air purification. In this work, 1 wt% Ru supported on CeO2 and Al2O3 catalysts were prepared by an impregnation method and subsequently tested for the catalytic oxidation of HCHO at low temperature. The activity of the Ru/CeO2 catalyst was significantly superior to the Ru/Al2O3 catalyst, achieving complete conversion of 130 ppm HCHO at 90 °C with a GHSV of 100 000 mL gcat−1 h−1. Brunauer–Emmett–Teller (BET) measurements, X-ray powder diffraction (XRD), high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), X-ray photoelectron spectroscopy (XPS) and H2-temperature-programmed reduction (H2-TPR) were carried out to characterize the physical and chemical properties of the catalysts. The results revealed that RuOx species, rather than Ru0, were directly responsible for the HCHO oxidation over Ru/CeO2, and the excellent performance of Ru/CeO2 was mainly attributed to the strong interaction between Ru and CeO2, which induced a high dispersion and high redox capacity of RuOx species. The reaction mechanism of HCHO oxidation was also investigated using in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). It was shown that the HCHO oxidation over the Ru/CeO2 and Ru/Al2O3 catalysts followed the same pathway of the direct formate oxidation (HCHO → HCOO + OH → H2O + CO2).
研究领域:
环境科学
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催化化学
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DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 13
·2072
·
IF 4.329
Xiaoyan Liu,Ruidan Liu,Tianyu Li,Yanqi Liu,Li Liu,Kai Lyu,Surendra P. Shah
Graphene is a two-dimensional sheet of regular hexagonal honeycomb lattice formed by sp2hybrid orbital bonding, with only one layer thickness of a single atom, which is known as the “super king” of the 21st century. Previous studies have shown that cerium oxide-graphene oxide (CeO2-GO(4:1)) nanocomposites eliminated the agglomeration of graphene to some extent and the CeO2-GO(4:1) epoxy coating could be prepared with good anti-corrosion performance. In this paper, CeO2-GO(4:1) nanocomposites were prepared by the hydrothermal synthesis method, and the three-electrode method was used for electrochemical tests. The state evolution of CeO2-GO(4:1)/EP coating and the synergy between CeO2-GO(4:1)/EP and corrosion inhibitor in simulated seawater solution with different concentrations (20%, 40%, 60%) were analyzed and illustrated by Optical Microscope (OM) characterization, Open Circuit Potential (OCP), Electrochemical alternating current Impedance Spectroscopy (EIS), Mott–Schottky curve and Tafel curve. The results indicated that CeO2-GO(4:1) nanocomposites showed good corrosion resistance in a marine environment. This research lays a solid theoretical foundation for the application of cerium oxide-modified graphene oxide anticorrosive coating in marine engineering.Keywords:CeO2-GO;corrosion inhibitor;simulated seawater;corrosion area
研究领域:
材料科学
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海洋工程
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 27
·11557-11565
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IF 3.288
Chao Miao,Junjie Liu,Jinxian Zhao,Yanhong Quan,Tao Li,Yongli Pei,Xiaoliang Li,Jun Ren
A rational approach for the optimization of cobalt based catalysts suitable for VOC combustion is to modulate the pore structure and increase the dispersion of active species. In this study, we have prepared CeO2–CoOx composite aerogels with a continuous porous structure using an epoxide-initiated gelation process and evaluated them in the catalytic combustion of toluene. The influence of the Ce/Co ratio on the structural properties and catalytic activities of the CeO2–CoOx aerogels was investigated using various characterization methods. The surface area of the CeO2–CoOx aerogels showed a volcanic curve versus the Ce content. A higher specific surface area of 172 m2 g−1 was observed for the CeO2–CoOx-10 catalyst with a Ce/Co ratio of 1/10. In addition, the presence of Ce modified the redox properties and the surface chemical states of the CeO2–CoOx aerogels, such as the surface Co3+/Co2+ ratios, and surface absorbed oxygen species (O− and O2−), which played key roles in their catalytic activity. In comparison with different cobalt-based catalysts for toluene oxidation in the previous literature studies, the CeO2–CoOx-10 catalyst in this work exhibited better catalytic performance, reaching an optimal toluene conversion of 90% at 248 °C as well as the highest stability during the durability test under different temperature stages.
研究领域:
材料科学
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环境催化
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化学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xiaoqi Jiang,Qing Li,Wenjie Xia,Zhiwei Huang,Xiaomin Wu,Huawang Zhao,Zhilei Guo,Weixin Kong,Chung-shin Yuan,Guohua Jing,Huazhen Shen
Elemental mercury (Hg 0 ) is the most difficult mercury species to remove from the flue gas. Photocatalysts of transition metal oxide modified TiO 2 can effectively remove Hg 0 . However, the metal oxide easily aggregates into large nanoparticles, reducing the atom utilization efficiency and photocatalytic activity. We presented a facile strategy of employing g-C 3 N 4 as an anchor to successfully load highly dispersed ultrasmall CeO 2 clusters on g-C 3 N 4 /TiO 2 . Moreover, the mechanism of anchoring CeO 2 clusters and charge transfer of the ternary photocatalyst were explored in-depth. The results demonstrated that at 250 °C, the photooxidation efficiency of Hg 0 by CeO 2 -g-C 3 N 4 /TiO 2 was several times higher than that of CeO 2 /TiO 2 , TiO 2 , and g-C 3 N 4 . The cavity of the tri-s-triazine ring anchored small CeO 2 clusters via strong Ce-N coordination bonds. A combined type II and Z-scheme transport paths accelerated the separation of photogenerated electron holes. This research offers valuable surface engineering strategy for highly dispersed ultrasmall cluster decorated TiO 2 .
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
Polymers
·
2022
·Vol. 14
·期 7
·1412
·
IF 4.967
Kai Lyu,Xiaoyan Liu,Ruidan Liu,Heng Yang,Yang Qiao,Surendra P. Shah
In the marine service environment, metal materials have a serious risk of corrosion. The corrosion rate of metal materials will be accelerated by the dual action of temperature change and alkali salt in saline-alkali environment. In order to delay the metal materials’ corrosion rate and prolong their service life, this paper used a CeO2–GO (4:1) nanocomposite prepared by the hydrothermal synthesis method to make an anticorrosion coating. The anticorrosion performance was evaluated by stereo microscope and 3D images of the corrosion site were fitted for calculation. The state evolution of the CeO2–GO (4:1)/EP coating immerged in a simulated saline-alkali solution was studied by open circuit potential (OCP), electrochemical alternating current impedance spectroscopy (EIS), Mott–Schottky curve and Tafel curve. The results indicated that CeO2–GO (4:1) nanocomposites exhibited good resistance compared with graphene oxide and nano cerium oxide in a simulated saline-alkali environment. The research in this paper lays a firm theoretical foundation for the application of nano cerium-oxide-modified graphene oxide anticorrosive coating in saline-alkali environment engineering.Keywords:CeO2–GO;corrosion depth;saline-alkali;anticorrosion
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2016
·Vol. 6
·期 22
·7967-7975
·
IF 5.287
Jie Zhao,Yun Wang,Yingxuan Li,Xiu Yue,Chuanyi Wang
CeO2 is a basic promoter for CO2 photoreduction with H2O over TiO2-based catalysts, but there is still a lack of insight into the interaction of CeO2 with different TiO2 polymorphs and its effect on CO2 photoreduction. In this study, pure anatase, brookite, and rutile TiO2 and their respective hybrids with CeO2 were prepared, and their structural properties, optical properties, interfacial interaction and activity for CO2 photoreduction were systematically studied. The addition of CeO2 improved the activity for CO2 photoreduction under simulated sunlight irradiation, but the improvement depends on the phases of the TiO2. X-ray diffraction, macro-Raman spectroscopic and electron paramagnetic resonance measurements confirm the presence of Ti defects at the CeO2–rutile interfaces, implying a relatively strong interaction between CeO2 and rutile, which is beneficial for the interfacial separation of photogenerated charge carriers. As a result, CeO2/rutile shows the best enhancement of CO2 photoreduction among the studied CeO2/TiO2 systems. Moreover, different paramagnetic species were detected in the three TiO2 polymorphs. The O− radical anion in the anatase lattice could be oxidized to produce Ti3+ under UV-light irradiation, whereas the O2− radical anion on the surface of brookite TiO2 might retard CO production.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 4
·636-641
·
IF 3.1
Fu Zerui,Wang Shu,Yu Haohan,Nie Meilin,Feng Xilan,Zuo Xintao,Fu Lichao,Liu Dapeng,Zhang Yu
Li-O 2 battery(LOB) has an ultrahigh specific capacity(3500 W·h/kg), however, its slow kinetics of oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) at cathode often leads to a high overpotential, a limited discharge capacity, and a poor cycling performance. Therefore, it is important to design and prepare cathode materials with a excellent catalytic activity. In this study, CeO 2 nanoparticles(NPs) supported on reduced graphene oxide(rGO) have been prepared and employed as cathode. Compared with either CeO 2 NPs or rGO, CeO 2 /rGO cathode greatly improves the discharge capacity(10644 mA·h/g at a current density of 100 mA/g) and the cycling performance(95 cycles at 200 mA/g with a limited capacity of 500 mA·h/g) by virtue of the good conductivity of rGO and the oxygen storage/release capability of CeO 2 .
研究领域:
材料科学
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电化学
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能源存储
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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）