JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Tingting Bao,Hui zhou,Yi Zhang,Chenxu Guo,Wenming Guo,Hang Qin,Pengzhao Gao,Hanning Xiao,Weixiong Liu
Ni/CeO 2 catalysts ( n CeO2 : n Ni = 0, 1, 4, 7, 10) supported on SiC porous ceramics for ethanol steam reforming (ESR) were investigated with respect to hydrogen production performance and growth of carbon deposition. The oxygen released from CeO 2 enables the oxidation of CH x species to serve as carbon precursors, thus providing Ni/CeO 2 catalysts with stronger resistance to carbon deposition compared with Ni catalysts. The Ni/CeO 2 catalysts prepared by inverse microemulsion and impregnation methods exhibit regular semicircular spherical shape on SiC porous ceramics. Under 500 °C for 25 h of ESR reaction, the ethanol conversion rate over Ni/CeO 2 catalysts ( n CeO2 : n Ni = 7) is sustained up to 100% and H 2 selectivity is essentially kept at 74%. The by-product selectivity declines stepwise with increasing content of CeO 2 , which is attributed to the adsorption and oxidation of CO and of CH x species as CH 4 precursor from CeO 2 . The scanning electron microscopy (SEM) and transform electron microscopy (TEM) results reveal that further loading of CeO 2 on the surface of Ni catalysts can alleviate both migration and sintering of Ni particles. Furthermore, carbon deposition on Ni/CeO 2 catalysts preferentially outgrow filamentous rather than amorphous carbon , with a tendency for the latter to be more deactivated.
研究领域:
催化化学
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材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2018
·Vol. 35
·期 7
·696-702
·
IF 1.547
Xinying Zhang,Chaoqun Wang,Wenbo Chai,Xiaoyan Liu,Yanming Zhang
A superhydrophobic CeO2-modified kapok fiber (SCMKF) was fabricated using CeO2 and octadecyltrimethoxysilane (OTMS) by a simple chemical deposition method. Scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray photoelectron microscopy, and the wetting behavior of water and oil on the surface were conducted to confirm the formation of CeO2 nanoparticles and the combination of OTMS with the surface. The SCMKF had the superhydrophobicity and good sorption capacity. The contact angle of raw kapok fiber (RKF) was 114.7°, however, that of SCMKF exceeded 150°. Oil absorption capacities of SCMKF for diesel oil, soybean oil, and lubricating oil were 48.65, 58.17, and 62.57 g/g, increased by 76.5%, 51.9%, and 51.9%, respectively, compared with RKF. Sorption of SCMKF could be well described by pseudo second-order kinetics. The SCMKF could reach the adsorption saturation within 3 min. After eight cycles, the oil sorption capacities of SCMKF decreased, but they were still much higher than those of RKF. The SCMKF showed good performance in the separation of oil–water mixture. It is a promising material for cleaning oil spill.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yuanyuan An,Guoxiu Hao,Xinyue Wang,Li Zhou,Mengyao Wu,Jialong Ma,Lien-Yang Chou
In this study, we synthesized CeO2 possessing an open pore structure and verified its structural differences compared to CeO2 lacking such an open pore structure. Using these two CeO2 samples as catalyst supports and loading them with Pd metals, a series of characterizations were carried out on the resultant catalysts to analyze their structures and properties meticulously. We have elucidated the influence of the open pore structure on the loading position of Pd. Hydrogenation reactions involving alkynes and alkenes were employed to confirm the existence of steric hindrance effects caused by the pore structure differences. Furthermore, we applied these catalysts to more valuable industrial reaction systems, demonstrating that the unique pore structures of directly synthesized CeO2 can also exhibit excellent performance in practical applications.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
S. Jiang,H. Zhang,Z. Li,L. Chen,L. Yin,X. Liu
Non-invasive sweat detectors can monitor the glucose level of diabetes in a painless way. However, most detectors need to collect enough sweat through external exercise or active stimulation, which increases the inconvenience of the user and reduces the applicable population. In this study, we propose an ultra-sensitive biomimetic glucose detector to detect the sweat produced by thermoregulation without additional exercise and stimulation. Inspired by the predator process of sponge in the sea, the sensing material of MXene (Ti 3 C 2 T x ) @CeO 2 hydrogels employed the “laminae-trestle-laminae” (L-T-L) structure of sponge to adsorb and transport glucose molecules in sweat. CeO 2 grafted onto the MXene surface can detect glucose by the catalytic activity of CeO 2 . The glucose detector with an ultra-low limit of detection (LOD = 0.004 μM), excellent sensitivity (801.27 μA⋅μM − 1 ⋅cm − 2 ), and a broad linear detection range (LDR = 0.01–2.5 μM) can satisfy detection requirements in human sweat after dilution. In real applications, the detector can detect glucose in the sweat of diabetic patients for five consecutive days and detect the glucose content in the daily drinks of patients. Our findings demonstrate the high potential of sponge-inspired MXene@CeO 2 glucose detector for routine medical testing.
研究领域:
生物医学工程
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材料科学
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医学检测
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
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IF 2.605
Guanjun Wen,Kuibao Zhang,Haibin Zhang,Yuancheng Teng,Ye Zhou
Synroc is recognized as the second generation waste form for safety disposal of high-level radioactive waste (HLW). In this study, the Synroc mineral of rutile was employed as host phase for the immobilization of Nd 2 O 3 and CeO 2 , which were selected as surrogates of trivalent and tetravalent actinide nuclides. Rutile waste forms with different Nd 2 O 3 and CeO 2 incorporations were prepared under normal pressure sintering. Nd 2 Ti 2 O 7 pyrochlore was produced as the target phase in 1100 °C calcined Nd-bearing TiO 2 . Lattice stabilization of CeO 2 in rutile TiO 2 could not be accomplished even under 1500 °C sintering. The 28 day normalized leaching rates ( LR i ) of Ti and Nd in Nd-bearing rutile, which decline congruously as the Nd 2 O 3 content increases, are lower than 3×10 −5 g m −2 d −1 . The incorporation of CeO 2 significantly impairs the aqueous durability of rutile waste form.
研究领域:
核废料管理
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Biosensors-Basel
·
2022
·Vol. 12
·期 8
·592
·
IF 5.743
Tong Li,Qi Wang,Zhou Wang
Facet and defect engineering have achieved great success in improving the catalytic performance of CeO2, but the inconsistent reports on the synergistic effect of facet and oxygen vacancy and the lack of investigation on the heavily doped oxygen vacancy keeps it an attractive subject. Inspired by this, CeO2nanocrystals with selectively exposed crystalline facets (octahedron, cube, sphere, rod) and abundant oxygen vacancies have been synthesized to investigate the synergistic effect of facet and heavily doped oxygen vacancy. The contrasting electrochemical behavior displayed by diverse reduced CeO2nanocrystals verifies that oxygen vacancy acts distinctly on different facets. The thermodynamically most stable CeO2octahedron enclosed by heavily doped (111) facets surprisingly exhibited the optimum non-enzymatic H2O2sensing performance, with a high sensitivity (128.83 µA mM−1cm−2), a broad linear range (20 µM~13.61 mM), and a low detection limit (1.63 µM). Meanwhile, the sensor presented satisfying selectivity, repeatability, stability, as well as its feasibility in medical disinfectants. Furthermore, the synergistic effect of facet and oxygen vacancy was clarified by the inclined distribution states of oxygen vacancy and the electronic transmission property. This work enlightens prospective research on the synergistic effect of alternative crystal surface engineering strategies.Keywords:electrochemical H2O2sensing;oxygen vacancy;facet;cerium dioxide
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Electrocatalysis
·
2014
·Vol. 6
·期 3
·255-262
·
IF 2.089
Lu Hai-Ting,Yang Zi-Juan,Yang Xin,Fan Yang
CeO 2 nanotubes with well-defined hollow interiors are employed as support material for Pd electrocatalysts towards formic acid oxidation (FAO). Pd nanoparticles are deposited both on the outer surfaces and inside interiors of CeO 2 nanotubes. The as-prepared Pd catalysts possess a large electrochemical surface area (ESA) and exhibit improved electrocatalytic performance towards FAO in comparison with the Vulcan XC-72 carbon black and the commercial CeO 2 powder supported Pd catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 12
·1572
·
IF 2.9
Yuqin Zhu,Jia Liu,Liang Li,Weikang Sun,Wei Tang,Lei Wang
To improve lubricant performance and extend the service life of machinery, the friction reduction and anti-wear performance of nano-cerium oxide (nano-CeO2) and nitrogen-containing heterocyclic borate (BNH2) composite additives were studied in this work, with the goal of obtaining better lubrication effects than a single additive. The results showed that the nano-CeO2modified with Span80 had good dispersion stability in the base oil. The optimal addition mass fractions of single nano-CeO2and BNH2 were 0.6 wt% and 1.0 wt%, respectively. Compared with the base oil, 0.6 wt% nano-CeO2reduced the coefficient of friction by 44.9% and the wear spot diameter by 27.8%, while 1.0 wt% BNH2 reduced the coefficient of friction by 49.1% and the wear spot diameter by 32.8%. Compared with the single additions of nano-CeO2and BNH2, the compound nano-CeO2/BNH2 further improved the friction reduction and anti-wear performance of the lubricating oil. Compared with the base oil, the 0.8 wt% nano-CeO2/1.0 wt% BNH2 composite additive reduced the coefficient of friction by 55.9% and the diameter of the abrasive spot by 48%. Physicochemical analysis of the wear surface revealed that the combination of nano-CeO2and BNH2 had excellent synergistic effects. The generated lubricant films of nano-CeO2/BNH2 contained a chemical reactive layer of organic nitride (C–N), Fe2O3, FeO, and B2O3and a physical adsorbent layer of CeO2that provided great friction reduction and anti-wear effects during friction.
研究领域:
材料科学
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机械工程
·
表面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Qi Ni,Congcong Ding,Fuxin Liu,Fen Luo,Xiaoyan Shu,Yulu Fu,Xirui Lu
Multi-component high-entropy pyrochlore (HEP) offers several advantages compared to single-component pyrochlore in solidifying radioactive waste , including the ability to solubilize multiple types of waste and lower leaching rates (LRs) of radionuclides . In this study, we successfully synthesized HEP (Y 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Gd 0.2 ) 2 Zr 2 O 7 and immobilized Ce, a simulated nuclide of Pu at 1500 °C for 48 h using a free occupied design approach. The Raman, XRD , and Rietveld refinement results showed that the immobilization limit for Ce fell between 20 wt .% and 30 wt .%. Notably, the ordered pyrochlore phase gradually transformed into the defective fluorite phase with an increase in Ce content. Moreover, the leaching tests demonstrated the excellent stability of the matrix, with the normalized LR for Ce reaching 10 −7 g·m −2 ·L −1 after 42 days at 90 °C. These findings collectively suggest that HEP (Y 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Gd 0.2 ) 2 Zr 2 O 7 holds promise as a substrate for immobilizing radioactive waste in the future.
研究领域:
材料科学
·
核能工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 88
·期 3
·654-659
·
IF 1.745
Wang Lijuan,Lv Hua,Li Binjie,Zhao Yanbao,Sun Lei
Flower-like ceria (CeO 2 ) architectures consisting of well aligned nanosheets were first synthesized by a glycol solvothermal method. The size of CeO 2 architectures is about 5 μm in width and 10 μm in length, with the nanosheets thickness below 100 nm. Subsequently, the adsorbed Ag ions on the surface of CeO 2 were in situ reduced to form Ag nanoparticles (NPs), leading to the fabrication of Ag/CeO 2 hybrid architectures (HAs). The formed Ag NPs with sizes of 20–40 nm were uniformly loaded on the surface of the CeO 2 sheets. The antibacterial properties of Ag/CeO 2 HAs against Gram-negative E. coli and Gram-positive S. aureus were evaluated by minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), and a filter paper inhibition zone method. The results demonstrated that Ag/CeO 2 HAs displayed excellent antibacterial activity toward S. aureus and E. coli , which were attributed to the synergistic antibacterial effect between Ag NPs and CeO 2 in HAs . Here, CeO 2 nanoflowers as a new substrate could restrict Ag NPs aggregations and improve their antibacterial activities. Therefore, the resulted Ag/CeO 2 HAs would be considered as a promising antibacterial agent.
研究领域:
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Richuan Rao,Hanwen Liang,Chunming Hu,Huaze Dong,Xiongzi Dong,Yongqiang Tang,Song Fang,Qiang Ling
Ag-CeO 2 nanoassemblys are prepared with a simple melamine-induced thermal decomposition method. Ag-CeO 2 nanoassemblys have a structure composed of Ag nanoparticles and CeO 2 nanoparticles. For Ag-CeO 2 nanoassemblys, Ag introduction can partially or completely activate lattice oxygen species of CeO 2 nanoparticles and however, the ease of Ag-CeO 2 interface oxygen activation is strongly influenced by their pyrolysis temperature. Ag-CeO 2 nanoassemblys prepared at 350 °C have only partial activation of CeO 2 surface oxygen. If the calcination temperature increases to 400 °C, Ag-CeO 2 nanoassemblys are fully activated to form more reducible interfacial lattice oxygen and to promote their low-temperature reductivity. Although excessive calcination temperature (500 °C) induces full activation of Ag-CeO 2 interface lattice oxygen, Ag-CeO 2 nanoassemblys will construct a new Ag-CeO 2 interface that is relative difficult to reduce, causing a less amount of reducible interface lattice oxygen provided at higher temperature. Ag-CeO 2 nanoassemblys are investigated to reveal the relationship of Ag-CeO 2 interfacial oxygen activation and CO catalytic oxidation performance. Ag-CeO 2 nanoassemblys with more interfacial lattice oxygen provided at lower temperature are found to have higher catalytic activity than that catalyst with the partially or excessively activated interfacial oxygen.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Baoshan Teng,Chunhui Ma,Jiayu Chen,Yunlai Zhang,Baohuan Wei,Maohai Sang,Hui Wang,Yuhan Sun
Ammonia is recognized as the best carrier for hydrogen storage and transportation. Nanomaterial catalysts have eminent catalytic activity for ammonia decomposition. However, the preparation of low-loading, high-activity noble metal atomically dispersed nanometer ammonia decomposition catalysts and their reaction mechanisms remain obscure. In this work, we report the synthesis of a stable ruthenium (Ru) atomically dispersed catalyst with oxygen-rich defects achieved through hydrogen etching of the support CeO2NR nanorods. The oxygen defects result in the catalyst exhibiting a favorable low-temperature catalytic activity and an exceedingly high atom utilization rate for ammonia decomposition. The hydrogen production rate from ammonia decomposition per unit mass of Ru is as high as 2446 mmol H2 gRu–1 min–1 at 1 bar, 450 °C, and gas hour space velocity = 12,000 mL gcat–1 h–1. In this case, the highly dispersed Ru provided enough active sites, while the oxygen defects of the catalyst enhanced the electron transfer tunnel between Ru and the nanorod support under a Schottky contact model. The detailed mechanism of oxygen defects for improving the catalytic performance of ammonia decomposition was studied by DFT modeling. Thus, this work provides a promising strategy to improve the catalytic efficiency of an atomically dispersed Ru nanocatalyst.
研究领域:
材料科学
·
催化化学
·
理论化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）