Nanomaterials
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2017
·Vol. 7
·期 8
·205
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IF 3.553
Yongjian Li,Panpan Guan,Fucheng Yu,Wei Li,Xiaoling Xie
The electrode based on cerium oxide (CeO2) nanorods embedded in nickel hydroxide (Ni(OH)2) matrix were prepared and used for detecting glucose non-enzymatically. The materials were characterized by X-ray diffraction, transmission electron microscopy (TEM), and so on. The results indicate that the response of CeO2/Ni(OH)2nanocomposite are significantly improved due to the synergetic effect between CeO2and Ni(OH)2. The optimum CeO2/Ni(OH)2nanocomposite electrode exhibits a detection range from 2 μM to 6.62 mM, a sensitivity of 594 μA mM−1cm−2, an estimated detection limit of 1.13 μM, and a response time less than 5 s. In addition, this biosensor also shows good selectivity, long term stability, and accurate measurement in juice on sale.Keywords:cerium oxide;nickel hydroxide;biosensor;glucose;nanocomposite
研究领域:
生物化学
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材料科学
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分析化学
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ChemCatChem
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2017
·Vol. 10
·期 5
·1019-1026
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IF 4.803
Qinhong Wei,Qingxiang Ma,Pingping Zuo,Huailin Fan,Shijie Qu,Wenzhong Shen
Graphical Hollow hydrogenation : A hollow CeO 2 spheres supported metallic Pd catalyst was prepared by employing a glucose hydrothermal method and impregnation method. The Pd/CeO 2 hollow sphere catalyst, which consisted of a hollow cavity and outer shell, presented a higher catalytic hydrogenation performance of styrene and nitrobenzene to produce ethylbenzene and aniline, better than that of the general CeO 2 -supported Pd catalyst. A hollow structured CeO 2 spheres supported metallic Pd catalyst (Pd/CeO 2 -H) was designed and prepared by a glucose hydrothermal method and impregnation method. The CeO 2 -H consisted of an inner hollow cavity and an outer shell on which a large number of mesopores were formed. The Pd/CeO 2 -H hollow sphere catalyst, which presented abundant surface oxygen vacancies, was investigated for catalytic hydrogenations of styrene and nitrobenzene to produce ethylbenzene and aniline. Activity tests indicated that the mesoporous Pd/CeO 2 -H hollow sphere catalyst exhibited striking catalytic activity, which was attributed to the spatial core–shell structure that provided more active sites and facilitated reactant diffusion as well as surface defects (oxygen vacancies), which were capable of transferring electrons to metallic Pd. All of these advances are beneficial to give a higher catalytic hydrogenation performance.
研究领域:
化学工程
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催化材料科学
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Catalysts
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2020
·Vol. 10
·期 2
·143
·
IF 3.52
Chengxiong Wang,Dezhi Ren,Junchen Du,Qinggao Qin,Aimin Zhang,Li Chen,Hao Cui,Jialin Chen,Yunkun Zhao
Ceria-modified Pt/Al2O3catalyst has been commonly prepared by the impregnation of platinum on ceria-modified alumina and widely applied in the chemical industry and automotive industry. The in situ diffuse reflectance infrared Fourier transformed spectroscopy (DRIFTS), and thermogravimetric (TG) analysis techniques were employed to investigate the typical mechanisms of the bis(ethanolammonium)hexahydroxyplatinate(IV) and cerium nitrate decomposition catalyzed by Ptδ+species for the facile synthesis of CeO2-Pt/Al2O3catalyst. It was found that Pt4+-catalyzed decomposition of cerium nitrate leads to the higher dispersity of ceria and forming more active oxygen species, on the basis of X-ray diffraction (XRD) and H2temperature-programmed reduction (H2-TPR) results. The in situ activity measurements were also performed to investigate the reaction mechanisms and the specific activities for the catalytic CO, NO, C3H6and C3H8co-oxidation. The results indicate that undesirable N2O by-product is formed by the selective catalytic reduction (SCR) of NO by C3H6below 350 °C. The cerium addition effectively improves the activity of catalytic oxidation, but exhibits an increased N2O yield, due to the increased reducibility.Keywords:platinum;ceria;in situ characterization;catalytic oxidation
研究领域:
化学工程
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材料科学
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Junxian Gao,Lingling Tang,Zhizhang Shen,Yuming Dong,Zhenyu Wang,Jinze Lyu,Ji Li,Han-Qing Yu
The coupling of solar energy conversion and catalytic ozonation is an effective way to eliminate volatile organic compounds with high-efficiency and low-energy-consumption. In this work, we presented a non-noble-metal SiC/CeO 2 system for solar-light-assisted catalytic ozonation of toluene. Temperature and light-controlled experiments and atmosphere surface photovoltage measurement were conducted to evaluate photothermal and photoelectric processes. Results show that toluene removal and mineralization efficiencies of 25%SiC-CeO 2 were 69.7% and 67.1%, respectively, under full-spectrum illumination with an hourly space velocity of 6000 /h. The SiC enhanced the conversion of incident visible and infrared (IR) light to heat, thereby increasing the reaction temperature over 25%SiC-CeO 2 . Moreover, SiC transferred electrons to CeO 2 in 25%SiC-CeO 2 , generating more surface Ce 3+ sites and promoting charge carriers separation efficiency. Given these characteristics, 25%SiC-CeO 2 exhibited outstanding performance in toluene mineralization, even better than Pd-loaded CeO 2 .
研究领域:
环境科学
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材料科学
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化学工程
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ENERGY & FUELS
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2022
·
IF 4.654
Shumei Chen,Chao Miao,Lixing Liang,Jing Ouyang
This paper reports the synthesis and CO2 methanation performance of Ni/CeO2–ZrO2 (CZ) solid solutions assembled on different clay minerals (rectorite, attapulgite, halloysite, and kaolin). The catalytic performance of the samples was examined in temperature range 200−400 °C at normal pressures. The attapulgite (ATP) assembled Ni nps-incorporated-CZ solid solution (Ni–CZA) has the highest CO2 conversion and excellent stability. The CO2 conversion of the Ni–CZA catalyst reached up to 81.2% at 400 °C, and CH4 selectivity was nearly 100%. The catalyst assembled on ATP has excellent adsorption performance and a large specific surface area, resulting in higher Ce3+ and adsorbed oxygen content, thanks to the high content of oxygen vacancies and faster oxygen transfer speed. Mechanistic analysis shows that the H2 dissociates at the Ni site, the CO2 was decomposed into CO and O, and the ATP and CZ provide hydroxyls and oxygen vacancies, respectively, in this composite catalyst.
研究领域:
催化化学
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材料科学
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环境科学
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高影响因子
Journal of Energy Storage
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2022
·
IF 8.907
Jia-Zhi Jiang,Yi-Jie Gu,Wei Wen,Zhizhen Ye,Jin-Ming Wu
Cerium oxide is one of the most abundant and environment-benignity rare earth oxides, which is thus of interesting to explore its feasibility to serve as a safe and efficient candidate for supercapacitor electrodes. We report herein a facile one-step molten salt method to synthesize CeO 2 nanoparticles abundant in surface oxygen vacancies , which are directly grown on a carbon cloth (CeO 2 @CC). The CeO 2 @CC exhibits a high specific capacitance of 811.5 mF cm −2 at the current density of 5 mA cm −2 in −0.8–0 V, with a good capacitance retention of 86.3 % at 5 mA cm −2 after 10,000 cycles in 6 M KOH aqueous electrolyte. When assembled with a Co 3 O 4 @CC positive electrode , the Co 3 O 4 @CC//CeO 2 @CC asymmetric supercapacitor achieves an energy density of 0.11 mWh cm −2 at a power density of 3.25 mW cm −2 . Both the abundant oxygen vacancies and the conductive carbon cloth contribute to the electrochemical performance. This work suggests that CeO 2 could be a candidate material for high performance supercapacitors .
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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BIOSENSORS & BIOELECTRONICS
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2013
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IF 5.437
Liu Deng,Chaogui Chen,Chengzhou Zhu,Shaojun Dong,Hongmei Lu
In this paper, Graphene oxide@SiO 2 @CeO 2 hybrid nanosheets (GSCs) have been successfully synthesized by the wet-chemical strategy. TEM, FITR and XPS were applied to characterize the morphology and composition of the nanosheets. The colorimetric assay of these nanosheets indicated that they possessed high intrinsic peroxidase activity, which should be ascribed to the combination of graphene oxide and CeO 2 . A fully integrated reagentless bioactive paper based on GSCs was fabricated, which were able to simultaneously detect glucose, lactate, uric acid and cholesterol. The results demonstrated that GSCs have great potential as an alternative to the commonly employed peroxidase in daily nursing and general physical examination.
研究领域:
材料科学
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医学诊断
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生物化学
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JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Qiyuan Wu,Shi Zhang,Xingtao Zuo,Lanxingyu Liu,Juan Xiong,Jiajie He,Yun Zhou,Cong Ma,Zhongbing Chen,Shuili Yu
Nanofiltration with high stable permeance is of great significance for wastewater treatment . Herein, we reported the novel polyamide thin-film composite (PA TFC) nanofiltration membranes prepared for the first time by blending nanometer cerium doped high silica ZSM-5 zeolites (CeO 2 @HSZSM-5, CHZ) in the aqueous phase followed by the classic interfacial polycondensation . The structural morphology of these membranes and their performance had been characterized. SEM and XPS characterizations clearly revealed the presence of inorganic CHZ in the PA layer. The results also showed that the CHZ-integrated inorganic-organic PA TFC membranes with a higher fraction of CHZ had a thinner PA active layer (28.3 ± 3.6 nm) and slightly enlarged pore size with lower crosslinking degree. The optimized membranes exhibited 1.65-folds pure water permeability of the traditional membrane, 20.3 L/(m 2. h . bar) with comparable Na 2 SO 4 and MgSO 4 rejection of 95.8% and 91.1%, respectively. The rejection of dyes stayed stable above 96.0% with boosted permeance, and the membrane almost completely removed CR and RB as well as natural organic matters. The composite membrane also sustained superior stability and excellent antifouling performance. The as-prepared CHZ-integrated PA TFC membranes with regulatable structural morphology and superior separation properties enables the potential practical application in wastewater treatment.
研究领域:
材料科学
·
环境科学
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高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Xinzhu Gan,Zhigang Wang,Bin Tian,Yong Xu,Ling Li,Rongfu Xu
In this study, a solvothermal method was utilized to fabricate a CeO 2 /TiO 2 bilayer coating on ZrO 2 fibers without the use of seed layers. The crystalline morphology, composition, and microstructural characteristics of the bilayer coating were investigated using XRD , Raman, EDS-mapping, SEM, TEM and XPS techniques. The effectiveness of the bilayer coating in shielding infrared radiation was evaluated through the utilization of reflectance and effective specific extinction coefficient (e*). When a dual-layer coating was applied, the fiber's e* underwent a significant enhancement within the wavelength range of 2.5–8 µm, with a maximum increase of 76.13 %. The study showcased that, with nearly identical thickness conditions, the bilayer CeO 2 /TiO 2 coating outperformed both the single-layer TiO 2 coating and the single-layer CeO 2 coating in terms of infrared light-blocking performance. Furthermore, the bilayer structure demonstrated outstanding heat resistance, withstanding temperatures of up to 1200 ℃. This exceptional thermal stability positions it as a highly favorable choice for applications requiring infrared opacity in high-temperature environments.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
H.H. Zhang,X. Zhang,H. Bian,L. Zhang,Y. Chen,Y. Yang,Z. Zhang
In this work, we synthesized a superhydrophobic self-healing silane hybrid coating based on benzotriazole (BTA) loaded hollow CeO 2 nano-capsules on copper substrate and evaluated the anti-corrosion and self-healing capability in 1 mol/L NaCl solution. The CeO 2 nano-carriers possessed a high loading capacity of 24.7% for the BTA inhibitor. The constructed CeO 2 @BTA/silane composite shifted the corrosion potential of copper substrate to more inert value. Both the anodic and cathodic reaction rates during copper corrosion process were remarkably inhibited. The corrosion current density was over three orders of magnitude smaller than that of the neat silane coating. Electrochemical impedance spectroscopy revealed that the protection efficiency was 99.5% and the polarization resistance was reduced slightly after 15 days of corrosion for the prepared CeO 2 @BTA/silane hybrid coating. The prepared coating also exhibited an excellent self-healing ability to external damages by fast desorption of the BTA inhibitor.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Yu Pan,Xun Liu,Meng Zhang,Qi Han,Yufei Shu,Mengxia Wang,Bei Liu,Zhongying Wang
The presence of excess fluoride ions in drinking water has raised widespread concerns, necessitating the development of effective methods for its removal. Cerium dioxide (CeO 2 ) holds promise as a selective adsorbent for fluoride ions, due to its exceptional affinity for fluoride and stability across a wide pH range. However, the impact of intrinsic properties of CeO 2 on its adsorption characteristics and mechanisms remains unclear. In this study, we prepared a range of CeO 2 materials with diverse intrinsic properties by adjusting the annealing temperature and atmosphere. Through a series of characterization techniques, we discovered a correlation between the content of oxygen vacancies, Ce(III) species, and surface hydroxyl groups (–OH), all of which decreased simultaneously with increasing air annealing temperature. With respect to the adsorption performance, the highest fluoride adsorption capacity of 111.1 mg g −1 was observed in un-CeO 2 , representing the nanomaterials with the highest oxygen vacancies. This capacity gradually decreased to 29.1 mg g −1 in 800-CeO 2 . Following fluoride adsorption, the oxygen vacancy density, Ce(III) content, and surface –OH content of all CeO 2 materials decreased. When CeO 2 materials were annealed in H 2 for 1 h, the F − adsorption density increased due to the formation of more oxygen vacancies and surface –OH. Based on our findings, we conclude that oxygen vacancies play a critical role in determining whether fluoride ions can successfully exchange with surface –OH groups and enter the crystal lattice of CeO 2 , which significantly affects the adsorption performance. The pivotal role of oxygen vacancies, as proposed in this study, provides a valuable direction for future research aimed at enhancing the fluoride adsorption performance of CeO 2 .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Hao Tang,Zi Ang Chen,Muchen Wu,Shunbo Li,Ziran Ye,Mingjia Zhi
Tuning the size of Au nanoparticles is always an interesting task when constructing Au/semiconductor heterojunctions for surface plasmon resonance-enhanced photocatalysis. In particular, the size of Au nanoparticles in the newly emerging “plasmonic aerogel” photocatalyst concept could approach the size of the semiconductor phase. This work provides an alternative route to realize the size tuning of Au nanoparticles in Au-CeO 2 composite aerogels to some extent, within the framework of the well-established epoxide addition sol–gel method. The size tuning is achieved by exploiting the multi-functionalities of a mixed organic acid additive containing a thiol group in the gelation step. The obtained aerogel photocatalysts are composed of a porous backbone of interconnected CeO 2 nanoparticles and Au nanoparticles, and the size of Au nanoparticles ranges from ∼30 nm to sub-10 nm, while the size of CeO 2 remains at ∼15–10 nm. The surface plasmon resonance peak position and intensity contributed by the Au nanoparticles then vary accordingly. Photocatalytic CO 2 reduction at the gas–solid interface is chosen as a model reaction to study the effect of Au nanoparticle size on the photocatalytic activity of composite aerogel photocatalysts. The addition of Au nanoparticles undoubtedly enhances the overall activity of the CeO 2 aerogel photocatalyst, while the degree of enhancement (in terms of total charge consumption) and product selectivity (CH 4 or CO) are different and correlated with the size of the Au nanoparticles. The best performance can be achieved in a composite in which the Au sizes are the smallest.
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