JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 6
·1-13
·
IF 2.127
Yang Runnong,Liu Yumei,Yu Lin,Zhao Xiangyun,Yang Xiaobo,Sun Ming,Luo Junyin,Fan Qun,Xiao Jianming,Zhao Yuzhong
A simple hydrothermal procedure is introduced, which leads to the successful synthesis of a new composite material with fine CeO 2 -ZrO 2 nanocrystallites embedded in amorphous and porous SiO 2 matrices. The composite material possesses an extraordinary high thermal stability. After being calcined at 1000 °C, it retains CeO 2 -ZrO 2 nanocrystallites of the size around 5 nm, a BET-specific surface area of 165 m 2 /g, and an oxygen storage capacity of 468 μmol/g. No phase segregation for CeO 2 -ZrO 2 nanocrystallites is detected and the SiO 2 matrices remain not crystallized. The composite material shows a great potential as a support of three-way catalyst, as evidenced in catalytic tests with supported Pt.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Weirong Zhou,Guoxuan Gu,Yuan Gao,Jiayin Han,Ning Yu,Chao Liao,Geyu Lu
Monitoring trace levels of nitrogen oxides (NOx) in high-humidity agricultural greenhouse environments is essential for both crop growth and workers’ health. However, achieving reliable NOx detection under extreme humidity remains challenging. Herein, this work presents an ultralow-detection-limit and highly humidity-tolerant NOx sensor based on Ag2Te/CeO2 nanocomposites. To the best of our knowledge, this is the first demonstration of Ag2Te/CeO2 heterostructures for gas sensing. Among the as-prepared samples, the optimal Ag2Te/CeO2 sample, with a molar ratio of 1:2, exhibited superior response and an ultralow detection limit of 5 ppb NO2 at 65 °C. The sensor response retained over 92% of its regular response even at 99% relative humidity. Density functional theory (DFT) calculations suggest that minimal H2O adsorption on Ag2Te and strong NO2 adsorption on CeO2, along with the formation of an n–n heterojunction, synergistically enhanced performance. Moreover, the sensor was further integrated into an Internet of Plants (IoP) environmental monitoring system. This work provides a new strategy for designing humidity-tolerant NOx sensors and offers a core device for smart agriculture.
研究领域:
材料科学
·
环境科学
·
农业技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Lihua Li,Shuang Liu,Meng Zhou,Yi Zhang,Shengli Liang,Jinliang Huang,Baohong Tian,Yongfeng Geng,Yijie Ban,Yong Liu,Yanlin Jia,Xu Li,Alex A. Volinsky
The effect of graphene on the thermal deformation of Cu/CeO 2 /Cr and GO-Cu/CeO 2 /Cr composites was studied. The isothermal compression test was carried out with Gleeble-1500D thermomechanical simulation device in the range of 600–900 °C and strain rate of 0.001–1 s −1 . The microstructure after deformation was characterized and analyzed by optical microscope, scanning electron microscope (SEM), transmission electron microscope (TEM) and electron backscatter diffraction (EBSD). The interaction of work hardening, dynamic recovery and dynamic recrystallization was described. The constitutive equation was successfully established. The results show that Cr particles are extruded into strips, and nano CeO 2 particles nail dislocations, which inhibit dynamic recovery and dynamic recrystallization. Dispersion strengthening, twin strengthening and grain refinement strengthening occur the thermal deformation of GO-Cu/CeO 2 /Cr composites, increase the flow stress and activation energy of the composites, and inhibit the dynamic recrystallization of the composites. When the hot deformation temperature increases, the texture orientation is strengthened. GO-Cu/CeO 2 /Cr composites have typical dynamic recovery characteristics and high temperature properties.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhijian Wang,Lanlan Liu,Qifeng Du,RuiTao Tang,Jun Ai,Ying Chen
Ti-related oxide ceramics often exhibit excellent microwave dielectric properties and are widely applied in the microwave communication field. However, their microwave dielectric properties are often influenced by unstable defects, which are caused by the relatively low oxygen partial pressure at high sintering temperatures . In this work, Al 2 O 3 was introduced to improve the defect structures of the 0.85CeO 2 -0.15TiO 2 ceramics. According to the XPS pattern and AC conductivity analysis, Al 2 O 3 doping could stabilize the valence state of Ti but increase the oxygen vacancy concentration. Q × f first increased and then decreased as the Al 2 O 3 content increased. The highest Q × f value of 54361 GHz was obtained for the CTA0.015 sample sintered at 1275 °C, as well as the ε r of 29.41 and τ f of +7.8 ppm/°C. Finally, the CTA0.015 sample was used to prepare a microstrip antenna via the screen-printing process, which exhibited a good temperature-independent resonant frequency and indicated good application prospects.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2014
·
IF 6.007
Fredrik Gunnarsson,Moa Z. Granlund,Mattias Englund,Jazaer Dawody,Lars J. Pettersson,Hanna Härelind
We report on a high NO x reduction activity over Ag/Al 2 O 3 catalysts, using hydrogen produced in a fuel reformer. The focus of the study is to evaluate the performance of a hydrocarbon selective catalytic reduction (HC-SCR) catalyst in real conditions. Initially, the catalytic materials for the fuel reformer (Rh/CeO 2 -ZrO 2 ) and the HC-SCR (Ag/Al 2 O 3 ) were evaluated in separate bench-scale reactor setups. These two setups were subsequently joined into an integrated bench-scale reactor setup with the aim to evaluate the influence of the reformate on the HC-SCR activity in a controlled environment. In the final phase of the study a 4 wt.% Ag/Al 2 O 3 catalyst doped with 100 ppm(w) Pt was scaled up and tested in a pilot-scale reactor setup. The pilot-scale reactor setup enabled evaluation of the HC-SCR activity in real exhaust gases generated by a single cylinder engine (genset) together with a hydrogen-rich gas supplied from a fuel reformer. Commercial biodiesel (NExBTL) was used as reducing agent for the HC-SCR as well as fuel in the fuel reformer for both the bench-scale and pilot-scale experiments. This study gives an excellent link between evaluations of the catalytic materials, controlled bench-scale experiments and applied engine experiments, proving a viable concept for lean NO x reduction together with onboard hydrogen production. A NO x conversion of above 70% was reached at temperatures below 250 °C, in bench-scale experiments when hydrogen produced in the fuel reformer is added.
研究领域:
环境科学
·
催化化学
·
能源工程
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Kai Su,Lin-xiao Li,Zhuo Zeng,Xue Yang,Tao Lei,Han Zhang,Qin Wang,Rong Cao
Industrial wastewaters, generated from such as abrasive and catalyst-producing processes, usually contain rare earth oxides: La 2 O 3 and CeO 2 . When employing anaerobic methanogenesis technology to treat these industrial wastewaters, the impacts of La 2 O 3 and CeO 2 cannot be ignored. This study thoroughly investigated the long-term effects of La 2 O 3 or CeO 2 in high-rate anaerobic expanded sludge bed (EGSB) reactors. When compared to the control reactor, it was found that the addition of La 2 O 3 led to an 11% decrease in chemical oxygen demand (COD) removal efficiency and 38% decrease in methane production rate ( MPR ). Similarly, the introduction of CeO 2 resulted in a 9% in COD removal efficiency and a 17% decrease in MPR . Both La 2 O 3 and CeO 2 had positive influences on enhancing methanogenic activity of anaerobic granular sludge (AnGS). Through the results of quantitative polymerase chain reaction (qPCR) and high-throughput sequencing analysis, it was revealed that La 2 O 3 and CeO 2 contributed to a balanced microbial community by promoting the growth of methanogens and suppressing anaerobic propionate and butyrate-producing bacteria. Meanwhile, La 2 O 3 and CeO 2 stimulated the proliferation of electroactive species: Geobacter and Methanospirillum . However, the results of quantification and characterization of Extracellular Polymeric Substances (EPS) of AnGS showed both La 2 O 3 and CeO 2 reduced the presence of tryptophan substances in EPS and decreased the protein/polysaccharide ratio. This led to the disintegration of AnGS into smaller zoogloea complexes. The findings of this study offer valuable insights for early-warning and optimization of anaerobic methanogenesis treatment in dealing with industrial wastewater containing La 2 O 3 and CeO 2 .
研究领域:
环境工程
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 8
·4778-4786
·
IF 1.134
Qin Lilu,Huang Jiamu,Hao Longlong,Su Jun,Ma Niu,Yin Lingyi
To improve corrosion performance of coatings on AZ31B magnesium alloy, the nano-CeO2 additives were included in Na2SiO3 based electrolyte during process of pulse micro arc oxidation (MAO). The MAO-CeO2 coating was successfully prepared to
characterize its structure, micro morphology and composition. The XRD results indicated that MAO-CeO2 coatings were consisted of Mg2SiO4, MgSiO3, MgF2 and CeO2. The intensity of CeO2 peaks increases with increasing
nano-CeO2 particles in electrolyte. The number of cracks on MAO-CeO2 coatings exhibited a V-shaped trend with increase in nano-CeO2 content. Meanwhile, the influence of nano-CeO2 on corrosion behavior of MAO-CeO2 coatings is investigated
by salt spray test and electrochemical measurement. The corrosion current density of coatings presented same trend and corrosion potential is further studied. The MAO-CeO2 coatings formed in electrolyte with 10 g/L nano-CeO2 showed best corrosion performance which has
the lowest corrosion current density of 0.58 nA/cm2 and the highest corrosion potential of - 1269 mVSCE.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Weiping Zheng,Lifeng Hao,Yang Zhou,Bin Gu,Zewen Jiang,Yujie Fang
To fulfill practical demands for metal protection, a more in-depth exploration of the corrosion resistance of cerium dioxide nanoparticles (CeO 2 NPs) is essential. In this work, biomimetic porous CeO 2 NPs, featuring a high concentration of oxygen vacancies , were synthesized using a sol-gel method. Biomimetic porous CeO 2 NPs, characterized by the presence of oxygen vacancies , served as nanocontainers for benzotriazole (BTA) loading. Following this, TEOS-BTA@CeO 2 NPs were prepared by introducing tetraethyl orthosilicate (TEOS), a TEOS film encapsulating BTA@CeO 2 . Through electrochemical and salt spray testing, the 3 % TEOS-BTA@CeO 2 coating demonstrated superior corrosion resistance for the substrate when compared to both the 3 % CeO 2 coating and the 3 % BTA@CeO 2 coating. Throughout the entire corrosion process, the intelligent release of BTA facilitated by the TEOS film, coupled with the reduction in corrosion current due to oxygen vacancies serving as electron-capturing centers in cerium oxide, further enhances the corrosion resistance of CeO 2 NPs. This work marks a significant advancement in the exploration of nanocomposites for the practical utilization of CeO 2 NPs in combating metal corrosion.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Haodong Tang,Wujian Zhang,Yue Meng,Bo Xie,Zheming Ni,Shengjie Xia
In this paper, M/CeO 2 (M=Pt, Ag, Au) photocatalysts were prepared and used for visible light degradation of methyl orange (MO) with H 2 O 2 as a sacrificial reagent. Utilizing X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), N 2 physical adsorption (BET), X-ray photoelectron spectroscopy (XPS), photocurrent characterization and electrochemical impedance spectroscopy, etc., the structure, morphology, chemical state, and optical properties of the catalyst were investigated. The effects of the amount of catalyst, the initial concentration of methyl orange, the pH value of the solution and the number of reuses on the photocatalytic degradation efficiency of MO were studied. The results showed that under optimized reaction condition of 15 mg 2Pt/CeO 2 catalyst, the initial concentration of MO was 20 mg/L, pH=5, the reaction time was 195 min and the amount of H 2 O 2 was 0.2 mL, the degradation percentage of MO reached 75.8%. The main active species of photodegradation are hydroxyl radicals and superoxide radicals, which was determined by free radical capture experiments and combined electron spin resonance (ESR). The photocatalytic mechanism based on work function difference and electron transfer was also discussed in detail.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 6
·1547-1552
·
IF 2.726
Jin Huan,Xu Ding,Tian Chao,Yue Yinghong,Hua Weiming,Gao Zi
A series of Sm-doped CeO 2 /Beta composite catalysts with various Sm/Ce atomic ratios(0.1–0.4) were prepared by an incipient impregnation method, followed by calcination at 650 °C. They were characterized by X-ray diffraction(XRD), N 2 adsorption, X-ray photoelectron spectroscopy(XPS), Raman, NH 3 -temperature programmed desorption(TPD) and CO 2 -TPD. The incorporation of Sm into CeO 2 /Beta increases obviously the propylene yield for the selective conversion of ethanol to propylene. The promoting effect of Sm on CeO 2 /Beta can be attributed to two reasons. One is more acetone intermediates are generated on the Sm-doped catalysts due to the enhanced formation of oxygen vacancies. The other is the conversion of acetone intermediate to propylene is enhanced owing to weaker and fewer acid sites on the Sm-doped catalysts.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Yan Zhang,Wanyi Liao,Guangqiang Zhang
In response to the ever-increasing energy crisis, hydrogen, as an ideal substitute for energy field, is gradually rolling into the public. Developing high-efficiency and earth-abundant non-noble metal electrocatalysts is considered as the key to electrolytic water technology. In this work, two-dimensional (2D) transition metal oxides (Co 3 O 4 or NiO)/CeO 2 heterostructures with rich oxygen vacancies (v-TMOs/CeO 2 HSs) have been successfully synthesized via a simple and general strategy. The as-synthesized Co 3 O 4 /CeO 2 HSs and NiO/CeO 2 HSs demonstrated outstanding bifunctional electrocatalytic performance for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline surroundings, supplying low overpotentials of at 10 mA cm −2 ( η 10 ) of 88 and 258 mV (Co 3 O 4 /CeO 2 HSs) as well as 99 and 265 mV (NiO/CeO 2 HSs). The 2D heterostructure and oxygen vacancies endow the v-TMOs/CeO 2 HSs with plentiful active sites and large active surface area, which can enhance the catalytic activity during the HER and OER. This work highlights a general strategy to fabricate the novel TMOs/CeO 2 catalysts with abundant oxygen vacancies, and provides the guidance for the rational construction of catalyst materials which can be devoted to the highly efficient HER and OER.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 39
·e202404063
·
IF 1.9
Xiangmei Ma,Shengmin Pan,Yiqing Wu,Bin Wang
Graphical A novel composite (BCE) by depositing ethyl 3,4-dihydroxybenzoate on the surface of Bi2S3-doped CeO2 was synthesized, and the prepared BCE/polyvinyl chloride (PVC) composite films displaied excellent UV-shielding property, butbarely catalytic thermal decomposition of the PVC matrix. In this study, bismuth sulfide (Bi 2 S 3 )-doped cerium oxide (CeO 2 ) was prepared via hydrothermal method, and by depositing ethyl 3,4-dihydroxybenzoate (EDHB) on the surface of Bi 2 S 3 /CeO 2 (Bi 2 S 3 /CeO 2 /EDHB and BCE). The samples were characterized by FTIR, XRD, TEM, and UV–vis absorption spectrum means. According to the characterizations, Bi 2 S 3 was successfully incorporated into the CeO 2 structure (Bi 2 S 3 /CeO 2 ), and the prepared BCE/PVC composite films display excellent UV-shielding property. Moreover, the result of thermogravimetric analysis (TGA) tests indicated that BCE also was barely catalytic thermal decomposition of PVC matrix. This work not only paves an attractive way for the design of the CeO 2 -based UV-shielding agent, but also provides valuable insights into the inspiration to construct high-performance UV-shielding composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）