APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Weihao Fan,Huaiyuan Wang,Chijia Wang,Zhanjian Liu,Yanji Zhu,Kaka Li
CeO 2 -PANI conductive polymer capsules were prepared by in-situ chemical oxidation polymerization. The capsules were dispersed in F51 epoxy resin and then sprayed onto the steel surface to form novel coatings after curing. The corrosion resistance of coatings was investigated by EIS in a 3.5 wt% NaCl solution. After 30 days, the 60-μm-thin coating containing CeO 2 -PANI capsules exhibited the highest corrosion resistance, and its impedance modulus was higher than 10 9 Ω·cm 2 , which was 10 times that of conventional PANI-Epoxy coatings. This improvement was attributed to the (Fe 3 O 4 + γ-Fe 2 O 3 + CeO 2 ) passive film actively formed by the synergistic effect of PANI and Ce 3+ ions. PANI polarized the anodic reaction and Ce 3+ inhibited the cathodic reaction.
研究领域:
材料科学
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腐蚀工程
·
聚合物化学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 13
·2690-2697
·
IF 4.034
Ke Tang,Jingcai Zhang,Wenzhi Wang,Shuping Wang,Jinxin Guo,Yanzhao Yang
A simple protocol has been reported here to successfully perform a controllable conversion between Ce(OH)4 nanorods [Ce(OH)4-NR] and Ce(OH)4 nanoflowers [Ce(OH)4-NF] based on a prolonged mechanical force-driven stirring process. Results show that the Ce(OH)4 nanostructures undergo a morphology transformation from the initial nanorods to irregular nanoflowers, then to nanoflowers emanating from one center only, by varying the stirring time before solvothermal reaction. The detailed study confirmed that the mechanical force significantly improved the mass transport of the solution and drove the seeds of Ce(OH)4-NR [seeds-NR] to generate the seeds of Ce(OH)4-NF [seeds-NF]. The final CeO2 products (CeO2 nanorods [CeO2-NR] and CeO2 nanoflowers [CeO2-NF]) that inherited the original morphology were obtained by annealing Ce(OH)4-NR and Ce(OH)4-NF, respectively. To further optimize the performance of the final products, Au/CeO2-NR and Au/CeO2-NF were synthesized by a simple oxidation–reduction process, which led to increased surface areas and promising potential in CO oxidation.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Rui Liu,Xianhua Zhang,Tao Liu,Xian Yao,Zhijian Zhao,Chunlei Pei,Jinlong Gong
The oxygen species over oxygen carriers determine the reaction performance in chemical looping partial oxidation of methane (CLPOM). This paper describes the dynamic migration and reaction of oxygen species over ceria-supported NiO oxygen carrier for CLPOM. At initial reaction stage, Ni-O species could be consumed rapidly and cause the full oxidation of methane to CO 2 . Afterwards, the active Ni-O-Ce species dominates the methane partial oxidation to promote the syngas yield. It is found that CO formation rate is linearly related with the content of oxygen species over Ni-O-Ce. Furthermore, the lattice oxygen from CeO 2 would migrate through the bulk to complement the consumed Ni-O-Ce oxygen species. Eventually, 5NiO/(40CeO 2 -Al 2 O 3 ) exhibit nearly three times as high as methane reaction rate of CeO 2 /Al 2 O 3 and two times as high as CO formation rate of 5NiO/Al 2 O 3 . This work provides the comprehensive understanding of transport and reaction mechanism of oxygen species for chemical looping processes.
研究领域:
化学工程
·
能源科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiaoyan He,Dan Su,Xiuqin Bai,Chengqing Yuan
Ceria (CeO2) nanoparticles with haloperoxidase (HPO)-like activity have gained attention as a biologically benign antifoulant. 3,4-Dihydroxy-l-phenylalanine (DOPA), a main composition in mussel foot proteins, plays a crucial role in the biofouling process. However, the impact on the HPO-like activity and antifouling performance of CeO2 nanoparticles when DOPA molecules adsorb on them remains unexplored. This interesting question warrants investigation, particularly considering that it may occur in an actual marine environment. Herein, the interaction between DOPA and CeO2 is explored. Despite the higher Ce3+ fractions and the lower band gap energies due to the electron transfer from DOPA to the CeO2 surface, DOPA still had a slightly negative effect on the HPO-like activity of CeO2 since they decreased the exposed Ce3+ sites. The DOPA-CeO2 nanocomposites with HPO-like activities could kill bacteria and trigger quorum-sensing signaling quenching, achieving a biofilm inhibition performance. Amazingly, 0.1% DOPA-CeO2 nanocomposite exhibited higher antibacterial activity and better biofilm suppression activities due to its HPO-like activity and positive zeta potential. The remarkable results demonstrated that DOPA, as a participant in the biofouling process, could enhance the antibacterial activity and antifouling performance of CeO2 nanoparticles at an appropriate concentration.
研究领域:
材料科学
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生物医学工程
·
微生物学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Ziheng Zhen,Antai Li,Tiantian Xiao,Maoshuai Li,Jing Lv,Shouying Huang,Yue Wang,Xinbin Ma
Bimetallic catalyst with dual-atom pairs has drawn much attention in heterogeneous catalysis due to their unique synergistic effects. In this work, we prepared a series CeO 2 supported Cu-Pt dual sites catalysts and found the optimized one of 2Cu0.025Pt/CeO 2 exhibited excellent performance in the hydrogenation of methyl acetate (MA). Its product yield of ethanol was as 4 times as that of 2Cu/CeO 2 catalyst under the same reaction conditions, with only 0.025 wt% Pt addition. Combined with various characterizations and contrast samples, it is demonstrated that the post-deposited trace Pt species preferentially located besides the copper atoms and formed Cu-Pt atomic pairs. But when further increasing the loading of Pt, the aggregation of Cu happened, leading to a rapid decrease of activity. To reveal the role of Cu-Pt atom pairs in the hydrogenation of carbon–oxygen bonds reactions, we conducted chemisorption experiments and DFT simulations. It is suggested that Cu-Pt atomic pairs significantly enhanced the adsorption and activation capability of both the MA and H 2 molecules during the reaction. These insights may provide synthesis and design strategy for high-performance dual-atom sites catalysts for the carbon–oxygen bonds hydrogenation reactions.
研究领域:
催化化学
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材料科学
·
理论计算
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Qiang Tan,Ting Qu,Cheng-yong Shu,Yan Liu,Yuting He,Wenfang Zhai,Sheng-wu Guo,Liting Liu,Yong-ning Liu
The broad application of direct methanol fuel cells (DMFCs) is impeded by the high cost of catalysts, the unsatisfied ionic conductivity of polymer electrolyte membrane (PEM), and the methanol crossover. To address the above issues, a unique strategy based on the permeable polymer fiber membrane (PFM) and nonplatinum catalysts was presented to achieve high-performance DMFCs. In this system, the high-dispersed Pd/Co–CeO2/C and methanol-tolerance NiCo2O4 were prepared and used as anode and cathode catalysts. Besides, the PEM was substituted by an inexpensive and electrolyte permeable PFM. As fabricated PFM-based DMFC shows encouraging performance (58.6 mW·cm–2), which is 3.1 times higher than that of classical PtRu catalysts and PEM-based cell (19.1 mW·cm–2) at room temperature, and the maximum power density of PFM-based cell even could reach up to 126.2 mW·cm–2 (26.1 mW cm–2 with air-feed) at 60 °C. Furthermore, the PFM-based cell exhibits excellent stability performance in the 200 h long-time discharging test. The high electrocatalytic activity and selectivity of the catalysts, observably decreased membrane resistance of PFM, and unique structure of PFM-based membrane electrode assembly are combined to boost the performance. It provides a new strategy to achieve high-performance DMFCs and substitute for the expensive Pt catalysts and polymer-electrocatalyzed membrane.
研究领域:
材料科学
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能源技术
·
电化学
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2019
·
IF 2.938
Qi Song,Rui Ran,Jiancai Ding,Xiaodong Wu,Zichun Si,Duan Weng
Porous ceria nanorods modified with Fe or Co were prepared via a hydrothermal method. The structural properties, catalytic activities for the total oxidation of propane, and catalytic mechanisms of these materials were systematically investigated by X-ray diffraction, Raman spectroscopy, N 2 adsorption–desorption, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, catalytic activity measurements and in situ Fourier transform infrared spectroscopy. Co-modified ceria exhibited the best catalytic activity during propane oxidation as well as enhanced reducibility due to the synergistic interactions between the Co and the CeO 2 support. Variations in the activating ability and reducibility of the catalysts resulted in the formation of distinctive intermediates during the catalytic process, and this explained the observed differences in catalytic performance.
研究领域:
材料科学
·
催化化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2015
·
IF 3.368
Xiaole Weng,Xiaoxia Dai,Qingshan Zeng,Yue Liu,Zhongbiao Wu
Heteropoly acids (HPAs) have been effectively utilized in selective catalytic reduction (SCR) of NO to improve the NH 3 absorption capacity and alkaline/alkali metal resistance for SCR catalysts. However, despite the promise on super-acidities, their other properties that would work on SCR process are still lack of exploration. In this study, a 12-tungstaphosphoric acid (H 3 PW 12 O 40 , HPW) was selected to modify a well-reported CeO 2 catalyst. The resulted CeO 2 /HPW catalyst was subsequently utilized for SCR of NO with excess NH 3 , which revealed a significantly promoted performance in SCR reaction. DRIFT analyses showed that the unique NO 2 absorption capacity of HPW could prevent the NO 2 being further oxidized into nitrate species and the abundant Brønsted acid sites could effectively retain the NH 3 , avoiding them being over-oxidized at evaluated temperatures. The presence of NO 2 was demonstrated able to induce a so called “fast SCR” reaction over the CeO 2 /HPW catalyst, which effectively facilitated the SCR reaction. Furthermore, we have also constructed a CeO 2 @HPW catalyst, which showed an enhanced SO 2 poisoning resistance in SCR reaction.
研究领域:
环境科学
·
催化化学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Ning Lu,Shurui Fan,Yaxu Zhao,Boxuan Yang,Zhongqiu Hua,Yi Wu
In this work, a selective methane gas sensor was prepared based on In 2 O 3 to eliminate the serious cross-sensitive sensitivity to VOCs, NO 2 , and CO, which are typical interfering gases for methane detection in domestic. The catalytic films of Pt-TiO 2 , Pt-CeO 2 , and Pt-ZrO 2 were placed on the top of the sensing layer, i.e., In 2 O 3 loaded with Pd. Catalytic films were designed as filters to catalytically oxidize the interfering gases, such as VOCs, to prevent them reaching the surface of the sensitive layers. Thanks to this design, our sensors showed a high selectivity to methane, even in the presence of ethanol, CO, and NO 2 . In addition, we confirmed via the power-law response of oxygen that the basic sensing mechanism between Pd-In 2 O 3 and the sensor-printed catalytic films are kept the same. Both follow the general model with MOS sensors, which involves an electron transfer process resulting from the adsorption of oxygen on the surface and interaction with methane molecules. The present study showed that catalytic filter films (Pt-TiO 2 , Pt-CeO 2 , and Pt-ZrO 2 ) printed on Pd-In 2 O 3 sensors could enhance the selective response to methane for methane monitoring.
研究领域:
材料科学
·
化学传感器
·
气体传感技术
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产品关联
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 3
·534
·
IF 3.4
Ke An,Gang Li,Tingting Fan,Feng Huang,Wenlin Wang,Jing Wang
AgNbO3-based ceramics have been widely studied as ideal lead-free materials. Herein, AgNbO3:xCeO2(x= 0, 1, 2 mol%) ceramics were successfully prepared by the conventional solid-state reaction method. The optimization of energy storage properties is ascribed to the enhanced antiferroelectric (AFE) stability and the increased breakdown strength (Eb). The reduction of the tolerance factor leads to the enhancement of AFE stability. In addition, the enhancement ofEbis due to the increase of actual density, which is achieved through the regulation of CeO2amount and grinding procedure in the experimental process. A high recoverable energy density (Wrec) of 5.04 J/cm3and an energy efficiency (η) of 46.2% were achieved in AgNbO3:0.01CeO2ceramics under an applied electric field up to 390 kV/cm. A higherηof 55.4% was obtained in AgNbO3:0.02CeO2components. This research provides guidance for finding ceramic materials with comprehensive energy storage properties.Keywords:antiferroelectric materials;energy storage performance;AgNbO3;breakdown strength;grain size heterogeneity
研究领域:
材料科学
·
能源存储
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Yu Su,Bo Zhang,Xiang Cheng,Kun Du,Leqing Feng,Wei Zhao
Herein, a novel sunlight-independent tribocatalytic system with efficient friction energy harvesting capability is proposed. This system demonstrates enhanced tribocatalytic performance of cerium oxide (CeO 2 ) nanoparticles driven by the friction between Cu coated on the glass beaker bottom and a Teflon (PTFE) magnetic disk. An apparent rate constant of 0.045 min −1 was achieved for methylene blue (MB) degradation, representing a 2.7-fold improvement over the CeO 2 @glass/PTFE system (0.01682 min −1 ). Notably, the system achieved > 90% degradation efficiency for high-concentration MB solutions (40 mg/L), surpassing the performance of previously reported tribocatalytic systems. Through multiscale tribo-interface characterization and radical trapping experiments, the synergistic catalytic mechanism was elucidated: Friction-induced charge carriers in CeO 2 are efficiently transferred via the interfacial electronic effects of the Cu/PTFE friction couple and the active surface with Ce 3+ /Ce 4+ redox couples. Electron paramagnetic resonance analysis confirmed that Cu coating modification on the surface of the beaker bottom enhanced hydroxyl radical (·OH) yield by 2.3-fold compared to glass, enabling complete pollutant degradation through hole (h + )-dominated oxidation pathways. This work transcends conventional catalyst modification strategies, establishing a new paradigm for interface engineering in mechano-chemical energy conversion systems.
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产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2014
·
IF 1.968
Anran Xie,Wei Liu,Shuping Wang,Xiufang Liu,Jingcai Zhang,Yanzhao Yang
KClO 3 , a strong oxidant, was employed in the template-free hydrothermal synthesis of flower-like CeO 2 . The structure and physicochemical properties of the samples were characterized via the XRD, N 2 adsorption, FE-SEM, TEM, HRTEM, H 2 -TPR techniques. Through a series of experiments, the formation of flower-like CeO 2 is strongly dependent on reaction time. Meanwhile, the transformation of two phases (Ce(HCOO) 3 and CeO 2 ) and a possible mechanism for the formation of flower-like CeO 2 were preliminarily proposed. The result shows that the H 2 consumption for surface reduction of the flower-like CeO 2 sample is significantly higher than the commercial CeO 2 sample and the BET surface area of the flower-like ceria nanoparticles is 38.8 m 2 /g, which are benificial to the catalytic reaction. Compared with the commercial CeO 2 , the as-prepared flower-like CeO 2 possesses the better catalytic performance for CO conversion.
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DOI
高影响因子
危险品化学品经营许可证（带存储）