MATERIALS SCIENCE FORUM
·
2014
·
IF 0
Cheng Bao Liu,Jun Chao Qian,Feng Chen,Zheng Ying Wu,Zhi Gang Chen
Negative-charged PS microspheres were prepared through emulsifier-free emulsion polymerization method. High-quality PS colloidal crystals were obtained via the horizontal deposition method. Hierarchically ordered macroporous CeO2 sheets were fabricated on fluorine-doped tin oxide (FTO) substrates using PS colloidal crystals as template by a continuous infiltration process. The structure and morphology of the products were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and nitrogen adsorption-desorption. The characterized results showed that macroporous CeO2 sheets replicated well three-dimensionally (3D) ordered structure derived from PS colloidal crystals template and possessed a relatively large specific surface area. Moreover, the synthesized hierarchical CeO2 sheets showed the highest photocatalytic activity under solar irradiation and also exhibited remarkable ability to remove methylene blue, suggesting they are promising catalyst for wastewater treatment.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Wentong Liu,Zunli Mo,Chao Shuai,Simin He,Ruimei Yue,Xudong Guo,Ying Chen,Hui Zheng,Jianchen Zhu,Ruibin Guo,Nijuan Liu
The TiO 2 /CeO 2 /PPS composite coating is prepared by air spraying method. The introduction of TiO 2 and CeO 2 into the PPS substrate significantly improves the corrosion resistance of the composite coating , and the electrochemical corrosion current density reduces two orders of magnitude. The coating is surface-modified with cetyltrimethoxysilane and has good hydrophobicity , so it has excellent anti-fouling and self-cleaning ability. It has the advantages of low processing cost and simple preparation method compared with other anti-corrosion coatings, since the coating is only prepared by a physical mixing method and does not involve complex chemical reactions, which possess the potential for practical application.
研究领域:
材料科学
·
防腐蚀工程
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Zhihe Zhang,Zihang Yu,Kai Feng,Binhang Yan
CO 2 methanation is gaining renewed attention due to the emerging application needs such as the power-to-gas concept and long-term space exploration missions. Maximizing the amounts of interfacial sites generally regarded as the efficient active sites is considered to be one of the most direct means to enhance catalytic activity but few breakthroughs have been made. Here, Eu 3+ is introduced to Ni/CeO 2 to promote the Ni-CeO 2 interaction, resulting in a remarkable low-temperature CO 2 methanation activity. Structural characterization indicates that the Ni/CeEu(9:1) catalyst achieves higher Ni dispersion compared to Ni/CeO 2 , which consequently generates more interfacial sites. More interfacial sites enhance the proportions of bidentate carbonates closer to interfacial sites as a faster hydrogenated species during the catalytic process, leading to enhanced low-temperature CO 2 methanation activity over the Ni/CeEu(9:1) catalyst. This work provides a chemical strategy to enhance the amounts of active sites and bring insights into the origin of enhanced catalytic performance.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2023
·
IF 2.8
Zhu Peng,Han Chunyang,Xia Haian
Catalytic hydrogenolysis of xylose to ethylene glycol (EG) and 1,2-propanediol (1,2-PG) is an important way for the high-value valorization of biomass. Herein, Ni-W/CeO 2 catalysts prepared by incipient-wetness impregnation method were used for the hydrogenolysis of xylose to EG and 1,2-PG. Several characterizations such as X-ray diffraction (XRD), Transmission electron microscopy (TEM) and X-ray photoelectronic spectroscopy (XPS) were used to analyze the physicochemical properties of the catalysts. The effects of different Ni/W ratios and reaction conditions on the hydrogenolysis performance of the catalyst were investigated. The doping of W promoted the selective cleavage of C–C and C-O bonds of xylose, thus improved the yield of EG 1,2-PG. The doping of W can form interactions with Ni and increase the oxygen vacancy concentration of CeO 2 , which have a significant impact on the catalyst activity. When the Ni: W ratio is around 1:1, the catalyst has the best activity, and the total yield of diols can reach about 43.2%.. When xylan was used as the substrate, the total yield of diols can reach to 58.7%. The possible reaction mechanism of xylose hydrogenolysis was also discussed. This work developed a new catalyst system for the directional conversion of xylose to EG and 1,2-PG, which provided a new idea for the design of catalyst to converting lignocellulose, especially carbohydrate into high-value chemicals. Graphical Abstract Ni-W/CeO 2 with different Ni/W ratio are efficient catalysts for hydrogenolysis of xylose to EG and 1,2-PG.
研究领域:
催化化学
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生物质转化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Yingwei Li,Hao Li,Kexin Li,Ruirui Wang,Ruirui Zhang,Ruixia Liu
Nanostructured cerium-based catalytic materials have attracted much attention in the field of redox catalysis, due to the excellent active sites exposed on the nanocrystal surface, and herein, the oxygen vacancy (OV) and the crystal facet effect of typical model nanostructured ceria (Nano-CeO2) were focused and investigated for the catalytic aerobic cyclohexane oxidation. Specifically for the CeO2 nanocubes with a {100} facet, the CeO2 nanopolyhedrons with a dominant {111} facet, and the CeO2 nanorods with a dominant {110} facet, the catalytic roles of the OV and acid sites toward cyclohexane oxidation were systematically investigated. Surface oxygen vacancy (Sur-OV) and intrinsic oxygen vacancy (Int-OV), and particularly the active Sur-OV and active Int-OV performing catalytic activity under a working state specific for cyclohexane oxidation, were accurately recognized and distinguished. Furthermore, the activation ability of the OV sites for activating molecular oxygen into active oxygen species (OActive) was also revealed, and the acid site properties, which include the acidity and the types of acid sites, were probed and quantified. The Nano-CeO2 with an exposed {100} facet possesses the most active Sur-OV, determining the catalytic activity, and has the strongest activation ability, contributing to a high reaction activity under extremely inert conditions. The Nano-CeO2 with a {110} dominant facet with the most active Int-OV and abundant acid sites could accelerate further oxidation to adipic acid; the effect of the two key sites was described particularly by the α factor (= Total Acidity × Amount of Active Int-OV). Finally, the property–performance relationship toward cyclohexane oxidation was speculated based on the Nano-CeO2 catalytic system.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Chengzhen Wei,Zhaojiang Yu,Zhencai Guo,Nan Guan,Wen Xing,Weimin Du,Lin Liu,Yongming Zhang,Cheng Cheng
Yolk-shelled hollow structures with unique structural features are incredibly attractive for energy storage systems . Here we present a self-template strategy to prepare carbon coated yolk-shelled Fe 3 O 4 -CeO 2 hollow spheres. First, yolk-shelled Fe-Ce glycerate precursors are designed by a solvothermal method. Afterward, the carbon coated yolk-shelled Fe 3 O 4 -CeO 2 hollow spheres are eventually synthesized via calcinations the obtained precursors in Ar. Such unique structures endow the Fe 3 O 4 -CeO 2 with abundant inner cavities, large surface area and more electroactive site. As electrode material for supercapacitors , a large capacity of 430 C g −1 is obtained at 2.0 A g −1 , and it can be as high as 198.4 C g −1 even at 20 A g −1 . Moreover, it also takes outstanding rate capability and superior cycling durability (only 5.2 % capacity reduction over 5000 cycles at 6.0 A g −1 ). Furthermore, a quasi-solid-state flexible asymmetric supercapacitor device is constructed by Fe 3 O 4 -CeO 2 cathode and activated carbon anode . The device manifests a high energy density of 46.6 Wh kg −1 at 2.0 A g −1 ( versus 1650 W kg −1 power density). Even at 15 A g −1 , the energy density is still 21 Wh kg −1 with 12,441 W kg −1 . We envision that this work not only explores a promising electrode material for supercapacitors, but also provides an alternative avenue to prepare yolk-shelled hollow structures toward energy storage applications .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Chenxu Liu,Zeming Yuan,Wei Li,Tingting Zhai,Zhonggang Han,Xinfang Zhang
MgH 2 is widely considered a great potential solid hydrogen storage material along with hydrogen energy and is recognized as a kind of renewable energy. However, its poor hydrogen absorption and desorption kinetics and high thermodynamic stability limit its application. In this work, CeO 2 @NC (Nano-Carbon supported CeO 2 particles) nanosphere catalysts were synthesized by a one-step hydrothermal method, and the particle size of CeO 2 was about 7 nm and MgH 2 + x wt.% CeO 2 @NC ( x = 0, 2, 4, 6, 8) composites were prepared by ball milling. It was found that the generation of oxygen vacancy defects and the multivalent environment of carbon-supported Ce can play the role of hydrogen pump and synergistically catalyze MgH 2 . Adding a carbon layer prevents nano-effect generation to a certain extent, which makes H atoms diffuse rapidly. The results show that MgH 2 + 6 wt.% CeO 2 @NC can release 5.89 wt.% H 2 in 50 min at 593 K, and MgH 2 without catalyst can only release 0.31 wt.% H 2 . As the amount of catalyst added increases, the dehydrogenation activation energy of the composite material decreases by 31.11 kJ/mol H 2 . Through density functional theory calculation, it was found that the adsorption energy of the material increased by 1.21 eV after the addition of the catalyst, and the Fermi level of the density of states of the composite increased, which accelerated the electron transfer rate. This study can help workers catalytically modify the hydrogen storage performance of MgH 2 . Introducing oxygen vacancy defects in carbon-based supported multivalent transition metal oxide catalysts gives them a unique electronic structure and excellent catalytic activity.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Hongna Xing,Guankui Long,Jiming Zheng,Hongyang Zhao,Yan Zong,Xinghua Li,Yajing Wang,Xiuhong Zhu,Mingtao Zhang,Xinliang Zheng
A novel strategy of boosting electrochemical performance of hybrid supercapacitor cathode based on interface engineering by fabrication of Schottky-type conjunction is proposed. The electrode is composed of binder free 3D CoP nanoflowers decorated by CeO 2 nanoparticles , which was directly grown on nickel foam, forming a conjunction interface. Compared to CoP, the CeO 2 @CoP electrode exhibits remarkable enhanced electrochemical performance. The significantly boosted performance can be attributed to the CeO 2 @CoP interface, which promotes electrons migration from CoP to CeO 2 and eventually forms positive holes on CoP. These positive holes can easily capture more OH − , creating more active sites for redox process . Furthermore, a hybrid supercapacitor full cell composed of CeO 2 @CoP and activated carbon was assembled, which exhibits outstanding energy storage performance with a specific capacity of 486.5 mC cm −2 at 1 mA cm −2 and outstanding cycle stability of 89% after 5000 cycles. The energy density is 55.4 Wh kg −1 at a power density of 955.9 W kg −1 . This work not only demonstrates that CeO 2 is an attractive additive for supercapacitor electrodes, but also provides an experimental/theoretical understanding of the enhanced electrochemical performance by electrons migration process on CeO 2 @CoP interfaces, which is important for the design of supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 9
·1901879
·
IF 4.948
Shuaishuai Peng,Jingxia Yang,Lei Guo,Jinjie Wang,Jiachang Zhao,Jingli Xu,Zhiquan Li
CeO 2 with different morphologies (nanoparticles/NP, nanorods/NR, nanocubes/NC, nano-octahedra/NO) are synthesized and decorated on BiOI nanoplates substrates to form CeO 2 @BiOI composites, which are used for aqueous Cr(VI) degradation. The intersurface states between BiOI and diverse CeO 2 nanoparticles exhibit distinct behaviors when checked by XPS and photoluminescence intensity. The Cr(VI) degradation results show that the synthesized CeO 2 @BiOI nanocomposites possess higher photocatalytic activity than pure CeO 2 or BiOI, and the CeO 2 -NP@BiOI nanocomposite (molar ratio of CeO 2 : BiOI = 1:2) is the best one among them, with which the Cr(VI) is degraded up to 95.0% after 30 min irradiation using it as the photocatalyst. The superior catalytic performance of CeO 2 -NP@BiOI can be attributed to a higher Ce 3+ ratio of CeO 2 -NP, a larger specific surface area, relatively low OH/CO 3 2− content on the composite surface, and especially the good interaction between the CeO 2 (111) facet and the BiOI surface.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2022
·Vol. 37
·期 17
·2815-2824
·
IF 2.909
Zhang He,Zhu Fang,Yu Fenting,Komarneni Sridhar,Ma Jianfeng
In this work, a multi-hollow spherical CeO 2 material was prepared, which when combined with persulfate (PS) efficiently catalyzed the degradation of basic orange II (BOII) under visible light. In the CeO 2 /PS/Vis system, the degradation rate reached 99.70% within 15 min, which suggested very strong photocatalytic activity. The effects of pH and dissolved oxygen were evaluated to provide a basis for subsequent verification of free radicals. Superoxide radicals (O 2 · − ), hydroxyl radicals ( · OH), and oxidative sulfate radicals (SO 4 · − ) generated in the process are conducive to efficient degradation. Afore mentioned radicals were proved by radical scavenging experiments with detection by electron spin-resonance spectroscopy, and the possible degradation pathways are proposed. In addition, after three consecutive degradation cycles, the degradation efficiency of the material was not less than 99%, which proved that the prepared multi-hollow spherical cerium oxide had high stability and recoverability. Graphical abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Liang Zhu,Yang Liu,Yanhui Gao,Ningxujin Ding,Danyu Wang,Liuliu Long,Beibei Wang,Junyu Lang,Evgeny I. Vovk,Yong Yang
The hydrogen dissociation and spillover mechanism on oxide-supported Cu catalysts play a pivotal role in the hydrogenation of carbon dioxide to methanol. This study investigates the hydrogen spillover mechanism on Cu/CeO2 catalysts using in situ spectral characterization under high-pressure reaction conditions and density functional theory (DFT) simulations. The research confirms that the Cu sites serve as the initial dissociation points for the hydrogen molecules. The chemically adsorbed hydrogen (H*) then spills over onto the CeO2 support and interacts with the lattice oxygen to form special hydroxyl groups, while simultaneously reducing the surrounding Ce4+ to form Ce3+. Interestingly, the temperature-programmed desorption (TPD) results found that heating the hydroxyl-containing surface mainly reverses H2 dissociation by desorbing H2 instead of forming H2O, while no significant vacancy formation was detected. The DFT calculation identified a subsurface pathway favoring hydrogen migration, which explained the dominating H2 in the TPD products. A chemical loop study after CO2/H2 cofeeding on the catalyst reveals that hydrogen spillover facilitates the highly reduced surface serving as the active centers, enabling a secondary methanol synthesis in a vacuum. This study provides a model of the formation and desorption pathways of hydrogen species on Cu/CeO2 catalysts and illustrates the key role of the hydrogen spillover mechanism in promoting the CO2 hydrogenation to methanol reaction through important experimental analysis.
研究领域:
催化化学
·
材料科学
·
理论计算化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Yan Tong,Zhicheng Li,Xiaofeng Lu,Liu Yang,Weining Sun,Guangdi Nie,Zhaojie Wang,Ce Wang
An electrochemical method for the detection of dopamine based on a glass carbon electrode modified with electrospun CeO 2 /Au composite nanofibers was investigated in this article. The CeO 2 /Au composite nanofibers were prepared by the electrospinning technique and then annealed in air. The CeO 2 /Au composite nanofibers were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) measurements. Cyclic voltammetry (CV) showed that the electrospun CeO 2 /Au composite nanofibers modified carbon glass electrode exhibited an excellent electrocatalytic response to the dopamine (DA). The detection limit (S/N = 3) was as low as 0.056 μM and the sensitivity could reach 127 μA mM −1 cm −2 . All these demonstrated that the electrospun CeO 2 /Au composite nanofibers were good electrocatalyst for the oxidation of dopamine.
研究领域:
分析化学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）