Coatings
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2023
·Vol. 13
·期 3
·534
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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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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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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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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xueliang Liu,Xinhuan Wang,Cui Qi,Qiusen Han,Wei Xiao,Shuagnfei Cai,Chen Wang,Rong Yang
Because of the high stability and low cost, nanomaterials performed as alternative artificial enzymes to natural enzymes have attracted much interest and been widely applied in bioanalysis , catalysis and environment in the past decades. In this work, Pt/CeO 2 nanocomposites were designed as novel nanozymes and synthesized by a surfactant free method. The Pt nanoparticles with an average size of 2.6 ± 0.4 nm were uniformly decorated on the surface of CeO 2 nanorods . The peroxidase-like activity of Pt/CeO 2 nanocomposites was verified by several chromogenic substrates in the presence of H 2 O 2 . Compared to CeO 2 nanorods and Pt nanoparticles, the as-prepared Pt/CeO 2 nanocomposites exhibited enhanced enzymatic activity due to the strong metal-support interaction. The steady-state kinetic results demonstrated that the catalytic behavior of Pt/CeO 2 nanocomposites consisted with the typical Michaelis-Menten kinetics. The mechanism studies illustrated that the Pt/CeO 2 nanocomposites acted as electron transfer mediators during the catalytic process rather than promoting the generation of hydroxyl radical . Based on the intrinsic inhibition effect of ascorbic acid (AA) on oxidation , a simple, sensitive and selective colorimetric assay for detection of AA was established with a good linear relationship (0.5–30 μM) and a low limit of detection (80 nM). Further applications of the present system for AA detection in real samples have been also successfully demonstrated, suggesting that the Pt/CeO 2 nanocomposites with facile synthesis, high stability and high peroxidase-like activity exhibited promising applications in biomedical fields.
研究领域:
生物分析
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催化
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环境科学
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高影响因子
Engineering
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2021
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IF 7.553
Xinyu Cao,Tiancheng Pu,Bar Mosevitzky Lis,Israel E. Wachs,Chong Peng,Minghui Zhu,Yongkang Hu
Reductive pretreatment is an important step for activating supported metal catalysts but has received little attention. In this study, reconstruction of the supported nickel catalyst was found to be sensitive to pretreatment conditions. In contrast to the traditional activation procedure in hydrogen, activating the catalyst in syngas created supported Ni nanoparticles with a polycrystalline structure containing an abundance of grain boundaries. The unique post-activation catalyst structure offered enhanced CO adsorption and an improved CO methanation rate. The current strategy to tune the catalyst structure via manipulating the activation conditions can potentially guide the rational design of other supported metal catalysts.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
RSC Advances
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2019
·Vol. 9
·期 27
·15229-15237
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IF 3.049
Xiaoning Ren,Zhixin Zhang,Yehong Wang,Jianmin Lu,Jinghua An,Jian Zhang,Min Wang,Xinkui Wang,Yi Luo
Understanding of surface active sites (SAS) of CeO2 is crucial to its catalytic applications. In the present study, we have employed capping experiments, DFT calculations, and spectroscopic characterization to study pristine CeO2 catalyst. We find that multiple SAS coexist on the CeO2 surface: oxygen vacancies as redox sites and the coordinately unsaturated Ce cations near the oxygen vacancies and the neighboring oxygen ions as Lewis acid–base sites. Dimethylsulfoxide (DMSO), pyridine, and benzoic acid are utilized to cap the redox sites, Lewis acid sites, and base sites, respectively. Selective capping on the redox site does not have much effect on the acid–base catalysis, and vice versa, indicating the distinct surface proximity and independent catalysis of these SAS. We draw attention to a relationship between the well-known redox sites and the surface Lewis acid and Lewis base pairs on CeO2 surface, which are responsible for driving various heterogeneous catalytic reactions.
研究领域:
材料科学
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催化化学
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2026
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IF 3.9
Bingjie Sun,Pengjun Duan,Yuxin Yu,Jiajun Xie,Xiaozheng Han,Qiaomei Sun,Jianzhong Zheng,Zhaoxiang Zhong
Developing catalysts with superior electron transfer capabilities has emerged as a key challenge in the activation of peroxymonosulfate (PMS). Herein, the morphology and electronic structure of CeO2 catalysts were modulated through Co doping, thereby generating a higher concentration of oxygen vacancies (Ovs) and providing additional active sites for PMS activation. At a Co doping level of 25%, the two-dimensional (2D) nanosheet-structured CeO2 achieved 93.6% degradation of Tetracycline hydrochloride (TC) within 60 min, with a rate constant (k) of 0.042 min–1. Quenching experiments and electron spin resonance (ESR) analyses elucidated the involvement of both radical and nonradical pathways in the TC degradation process. Density functional theory (DFT) calculations demonstrated that Co-doped CeO2 with Ovs not only reduced the energy barrier for PMS activation but also enhanced the generation of reactive radicals. This study offers novel insights and technical support for the treatment of wastewater contaminated with recalcitrant organic pollutants.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Dandan Feng,Zhihong Li,Yumei Zhu,Huanli Ji
In this study, effects of rare earth oxide CeO 2 and Y 2 O 3 on the structure and properties of glass-diamond composites were systematically researched. The thermal analysis of the borosilicate glass was performed by TG-DSC curves. Phase composition of the glass-diamond composites was analyzed by XRD . SEM images showed the microstructure of the composites. Thermal properties of the composites were characterized by thermal conductivity and coefficient of thermal expansion . Bending strength was measured to explain the mechanical properties. Results showed that the addition of CeO 2 and Y 2 O 3 improved the mechanical and thermal properties of the glass-diamond composites and CeO 2 /Y 2 O 3 compound additive had greater impacts on the composites than single additive. When the content of CeO 2 /Y 2 O 3 additive reached 4 wt % (1.07 vol %), the thermal conductivity and bending strength of the glass-diamond composites increased by 69.77% and 35.13%, respectively.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Dan Baohui,Mahmood ul Haq,Salah Ud Din,Shabab Hussain,Shao Wenyi,Wu Jingmin,Chi Hanwen,Zhizhen Ye,Liping Zhu
The SF 6 gas in gas-insulated switchgear (GIS) systems decomposes into SO 2 F 2 , SOF 2 , SO 2 , and H 2 S under abnormal conditions such as partial discharge. The detection of these decomposition gases with high sensitivity is essential for the safe operation of GIS devices. Herein, we report the synthesis of cerium oxide and multiwalled carbon nanotube composite (CeO 2 @MWCNTs). The CeO 2 @MWCNTs composite was characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy , X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller analysis. The CeO 2 @MWCNTs composite sensor provided a response value of 7.7 at 100 ppm of SO 2 F 2 at a low operating temperature (50 °C), and the response and recovery features of the CeO 2 @MWCNTs composite sensor were recorded at 43 and 28 s, respectively. Moreover, the composite sensor exhibited excellent stability after two months. The developed CeO 2 @MWCNTs composite sensor can offer an exceptional platform for gas sensing applications in diverse fields.
研究领域:
材料科学
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气体传感技术
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电力设备监测
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纳米复合材料
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环境监测
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Xun Liu,Danyal Rehman,Yufei Shu,Bei Liu,Li Wang,Li Li,Mengxia Wang,Kunkun Wang,Qi Han,Linlin Zang,John H. Lienhard,Zhongying Wang
Selective capacitive deionization (SCDI) is a promising process for preferentially removing specific ions from waters with complex compositions. The selectivity towards certain species in CDI is most frequently achieved through novel electrode materials with high affinities towards targeted species. In this study, we investigate the selective removal of fluoride ions from groundwater containing concentrated co-existing chloride ions. A carbon nanotube-CeO 2 (CNT-CeO 2 ) electrode is employed for the electro-sorption of fluoride ions. Our findings are compelling: when processing a mixed F − /Cl − solution comprising 10 mg/L F − and 100 mg/L Cl − , the CNT-CeO 2 electrode is seen to reduce the concentration of F − ions to 1.5 mg/L in just 150 min, amounting to an 85 % F − removal efficiency, while the Cl − removal efficiency remains below 2 %. Importantly, this translates to a F − /Cl − separation factor of up to 4.16 when using the CeO 2 -based electrodes, which is 40 times higher than that achieved with conventional activated carbon (AC) electrodes. Furthermore, the energy consumption for treating actual groundwater using scaled-up equipment is impressively low at approximately 0.2 kWh/m 3 . The high affinity of CNT-CeO 2 towards fluoride is attributed to the intercalation Faraday capacitance initiated by the reaction between F − with CeO 2 , as verified by the electrochemical quartz crystal microbalance (EQCM). Moreover, EQCM results show a substantial increase in both mass and current as the potential increased beyond 0.8 V vs Ag/AgCl, implying that the current surge is not a result of water splitting but rather the adsorption of F − onto the CNT-CeO 2 electrode. The addition of CNTs substantially increases the conductivity of CeO 2 electrodes and restricts the aggregation of CeO 2 , thereby accelerating ion diffusion and promoting selective adsorption characteristics. Importantly, our electro-driven approach demonstrates excellent adsorption–desorption over 20 cycles. This comprehensive study advances the technological development of selective CDI, while providing new insights for fluoride removal in groundwater.
研究领域:
环境工程
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水处理
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电化学
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材料科学
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DOI
高影响因子
Energy Sources Part A-Recovery Utilization and Environmental Effects
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2019
·
IF 0.894
Pengcheng Liu,Ruyue Niu,Wei Li,Shuang Wang,Jinping Li
In this essay, the effect of the morphology of the CeO2 support and the Ba promoter on the ammonia synthesis reaction was studied. CeO2 support with {110} and {100} crystal planes and more oxygen vacancies enhanced the catalytic activity of ammonia synthesis. The relatively uniform microspheres structure CeO2 support (CeO2-MS) with {110} and {100} crystal planes was synthesized. The structural functions of the as-synthesized CeO2 support for the Ru-based catalyst were investigated in the ammonia synthesis reaction. The results of catalytic performance showed that the catalytic activity of 2.5%Ru/CeO2-MS catalyst reached 8940 μmol· g−1· h−1 at 450 ℃, 3.8 MPa, H2/N2 = 3 (60 mL∙min−1), which is higher nearly 2.5 times than the 2.5%Ru/CeO2-commercial (CeO2-C). And the catalytic activity of catalysts increased with the increase of reaction temperature. The activity of 6%Ba-2.5%Ru/CeO2-MS (24000 μmol· g−1· h−1) catalyst increased about 268% than that of catalyst without addition of Ba. Their physical and chemical properties were characterized by XRD, BET, HRTEM, H2-TPR, H2-TPD, and XPS analyses. Our results indicate that the 2.5%Ru/CeO2-MS catalyst and catalysts involving promoters (Cs, K, and Ba) exhibit significant support-morphology-dependent catalytic activity for ammonia synthesis.
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高影响因子
Next Materials
·
2026
·
IF 4.7
KS Pushpa valli,K. Velmurugan,A.S.I. Joy Sinthiya,S. Mary Jelastin Kala,B. Malathi,V. Selvam,C. Anitha
In this work, easy synthesis of CeO 2 nanoparticle-hybridized g-C 3 N 5 /PANI composites is carried out to investigate their interfacial effects on the photocatalytic degradation of Cango Red (CR). The synthesised CeO 2 @g-C 3 N 5 /PANI (Polyaniline) exhibited prevailing photocatalytic activity in contrast to g-C 3 N 5 , CeO 2 and CeO 2 @g-C 3 N 5 . CeO 2 -facilitated photoinduced charge transfer between g-C 3 N 5 and PANI is accountable for the CeO 2 @g-C 3 N 5 /PANI nanocomposite's increased photocatalytic activity. The five recycling tests are used to observe a strengthening of the nanocomposite. Additionally, we elucidated the redox process involving the CeO 2 @g-C 3 N 5 /PANI nanostructure to understand the enhanced electrochemical properties of the composite. The CeO 2 @g-C 3 N 5 /PANI nanostructure exhibited an improvement in the specific capacitance from 230.73 to 76.53 F/g. The composite shows exceptional rate capacitance and satisfactory cyclic stability for up to 2000 cycles at a maximum current density of 20 A g −1 . The assynthesized CeO 2 @g-C 3 N 5 //PANI nanocomposite was fabricated as an electrode to analyse its charge and discharge behaviour. Furthermore, the asymmetric supercapacitor exhibited a remarkable specific capacitance (256 Fg −1 at 2 mV s −1 ) elevated energy density (1.72 Wh kg −1 ) and outstanding power density (1287 W kg −1 ).
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高影响因子
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