Materials Today Chemistry
·
2026
·
IF 6.7
Sara Adeeba Ismail,Wenqi Lei,Lulu Jiang,Donglin Han
Ba 7 Nb 4 MoO 20 is a pure oxide ion conductor in both dry and wet oxygen atmospheres at the operating temperature of solid oxide fuel cells and has the promising potential to be applied as electrolyte materials. In this work, donor-doping trivalent rare earth elements R ( R = Y, Ce, Nd, Ho, Er and Yb) to replace the divalent Ba cations increases oxygen content slightly, but effectively enhances oxide ion conduction. Although the solubility of these dopants is less than x = 0.02 in Ba 7- x M x Nb 4 MoO 20+0.5 x , the Ba 6.98 Er 0.02 Nb 4 MoO 20.01 composition exhibits the highest conductivity, reaching 0.0066 and 0.0085 S cm −1 at 700 and 800 °C, respectively, nearly 6 times higher than that of pristine Ba 7 Nb 4 MoO 20 . H 2 O/D 2 O isotope effect measurement verifies that these materials are essentially pure oxide conductors even in wet atmospheres. It is hard to believe that the trace-level dopant concentration can influence the conduction behavior effectively. However, the slight change in the oxygen content, particularly in the BaO 2 conduction plane, is possible to influence the conductivities. The oxygen occupancy in the O1 and O5 sites thereby seems to be highly sensitive to and dependent on the occupancy of the dopants over the Ba and Nb/Mo sites.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Chunlin Wang,Hongzhao Xu,Shubo Xu,Wuju Wang,Yanchun Zhou,Xinghong Zhang,Wenbo Han,Changqing Hong
Oxide aerogels are promising as high-efficiency thermal insulation materials under extreme conditions owing to their low density, high porosity, large specific surface area, and ultralow thermal conductivity. However, their limited temperature resistance, volumetric changes during crystallisation and phase transitions, hinder their widespread application. To overcome this bottleneck, a novel strategy to retard the crystallisation and enhance the thermal stability of HfO 2 aerogel through the controlled incorporation of Si and Y was proposed. HfO 2 and ternary HfO 2 –Y 2 O 3 –SiO 2 (HYS) aerogels were synthesised via sol–gel method. The HfO 2 aerogel crystallised below 600 °C and underwent sintering at 1200 °C. Conversely, the HYS aerogel comprised low-crystallinity Y 2 Hf 7 O 17 nanocrystals after heat treatment at 900 °C, demonstrating a large specific surface area of 310.23 m 2 /g. The dopant elements were found to effectively inhibit sintering, enabling the HYS aerogel to retain a significantly large specific surface area of 48.72 m 2 /g even after heat treatment at 1200 °C. Y 2 Hf 7 O 17 exhibited a minimum thermal conductivity of 0.89 W·m −1 ·K −1 , providing the HYS aerogel with superior high-temperature thermal insulation performance. Furthermore, the comparatively lower linear shrinkage during the high-temperature heating process revealed HYS as a promising novel thermal insulation material for extreme environmental applications. This study expands on the oxide aerogel system and provides valuable guidance for component selection and design strategies for high-thermal-stability oxide aerogels.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Yiao Xu,Hongsen Xie,Xingtai Chen,Yujun Guo,Jiayi Qu,Changsheng Ji,Xiaoning Wang,Davoud Dastan,Xi-Tao Yin,Xiaoguang Ma
This study reports, for the first time, the synthesis of yttrium-doped cadmium sulfide (Y-doped CdS) nanomaterials via a one-step hydrothermal method and the fabrication of a high-performance gas sensor for isopropanol detection. At an optimal operating temperature of 162.5 ℃, the sensor exhibited a remarkable response of 400–100 ppm isopropanol, which is approximately five times higher than that of the undoped CdS sensor. Additionally, the device demonstrated ultrafast response/recovery kinetics (8 s/2 s), excellent selectivity, and robust long-term stability. Structural and compositional characterizations indicate that Y-doping induces lattice distortion in the CdS matrix, effectively suppressing grain growth. Furthermore, electron paramagnetic resonance (EPR) analysis revealed that Y 3 + doping significantly increases the concentration of sulfur vacancies. These structural modifications, combined with defect engineering, collectively enhance the gas sensing performance, offering a novel strategy for the rational design of high-efficiency isopropanol sensors.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 36
·1-9
·
IF 2.8
Xiong Lu,Hu Haisheng,Liu Meitang,Zhang Chongji
Upconversion materials have significant application prospects in many fields due to the advantages of being excited by infrared light. However, the development of upconversion materials is constrained by low upconversion efficiency and low luminescence intensity. The aim of this work is to improve the luminescence efficiency and intensity of fluorine-based upconversion luminescent materials through ternary alkali metal doping. A series of ternary alkali metal-doped Li x Na y K (1−x−y) YF 4 :Yb 3+ , Er 3+ novel upconversion luminescent materials were synthesized by a one-step facile hydrothermal method, and their mechanisms were explored. The results show that the doping of Li, Na, and K ions changes the crystal structure of Li x Na y K (1−x−y) YF 4 :Yb 3+ , Er 3+ , thereby affecting the spatial structural relationship between the rare-earth ions, which changes the energy transfer efficiency to them. The luminescence intensity of the prepared Li x Na y K (1−x−y) YF 4 :Yb 3+ , Er 3+ was 30 times higher than that of the undoped samples when doped with Li, Na, and K ions in a molar ratio of 10:6:9. This study provides a simple and effective method for the preparation of upconversion materials with excellent luminescent properties.
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CHEMOSPHERE
·
2022
·
IF 8.943
Yufan Zhang,Pu Ma,Heyun Fu,Xiaolei Qu,Shourong Zheng
Chloroanisoles is a class of odorous pollutants commonly identified in drinking water . In the present study, we confined noble metal palladium (Pd) in the micropores of zeolite Y ( ie -Pd@Y) using an ion exchange method, and applied it for the catalytic hydrodechlorination removal of chloroanisoles (represented by 2,4,6-trichloroanisole/TCA) in water. Pd supported on zeolite Y surface ( im -Pd/Y, prepared by conventional impregnation method) was used as the benchmarking catalyst. The characterization results revealed that ie -Pd@Y had smaller Pd particle size and higher Pd n+ /Pd 0 ratio than im -Pd/Y. The catalytic hydrodechlorination of TCA followed a concerted dechlorination pathway and the Langmuir-Hinshelwood model. The ie -Pd@Y catalysts with different Pd loadings exhibit excellent catalytic activities with more than 95% of TCA removed within 30 min, which is far superior to the im -Pd/Y catalysts (27–70%). Moreover, due to the confinement effect of zeolite Y, ie -Pd@Y displayed enhanced catalytic stability as compared with im -Pd/Y. The initial activity of ie -Pd@Y was more than 20 times higher than that of im -Pd/Y after five reaction cycles. Additionally, with the assistance of sieving effect, ie -Pd@Y displayed much stronger capability against the interference from dissolved organic matter than im -Pd/Y. The present results demonstrate that the confined catalysts ie -Pd@Y can be applied in liquid phase catalytic hydrogenation to effectively eliminate halogenated odorants in waters.
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NANOTECHNOLOGY
·
2022
·Vol. 34
·期 5
·055401
·
IF 3.953
Hongjing Wang,Hang Ren,Songliang Liu,Kai Deng,Hongjie Yu,Xin Wang,You Xu,Ziqiang Wang,Liang Wang
The synthesis of catalysts with controllable morphology and composition is important to enhance the catalytic performance for oxygen reduction reaction (ORR). Herein, trimetallic PtPdY mesoporous nanospheres (PtPdY MNs) are produced via a one-step chemical reduction method applying F127 as soft temple under acidic condition. The mesoporous structure provides a large contact area and also stimulates the diffusion and mass transfer of reactants and products. Besides, synergistic effect among Pt, Pd and Y elements effectively alters their electronic structure, enhancing the catalytic activity. Therefore, the PtPdY MNs show excellent ORR permanence to Pt/C under the alkaline solution. This study offers an effective channel for the preparation of mesoporous metals with rare earth metal doping towards promising electrocatalytic applications.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 12
·7548-7557
·
IF 4.186
Sara Adeeba Ismail,Donglin Han
La 2 Ce 2 O 7 is a fluorite-type oxide, showing almost pure oxide ion conduction in dry oxygen atmosphere. Under wet oxygen atmosphere, protons are introduced into La 2 Ce 2 O 7 through hydration reaction, making the material proton-conducting. However, compared with the oxide ion conductivity, the proton conductivity is negligibly small in La 2 Ce 2 O 7 . Here we report the effect of doping trivalent rare earth cations R 3+ ( R = Y, Ho, Er, Yb, or Tm) and elevating partial pressure of water vapor on the proton concentration and conductivity of La 2 Ce 2 O 7 . The samples show single fluorite phases with the doping level up to 0.2, and the solubilities of these dopants were within 0.2–0.3 in La 2 Ce 2 O 7 . The proton concentration increased by doping, due to higher amount of hydratable oxygen vacancies, and statistical coordination of oxide ions surrounded by R 3+ in addition to La 3+ . The sample with the Y content ( x ) of 0.05 showed the highest conductivity at 600°C among La 2 (Ce 1− x Y x ) 2 O 7− δ ( x = 0–0.3) samples, possibly due to the balance between the improved hydration ability and decreased mobility of protons with the increasing Y doping level. Then, the dopant content was fixed to 0.05, and La 2 (Ce 0.95 R 0.05 ) 2 O 7− δ ( R = Y, Ho, Er, Tm, or Yb) was prepared. It was found that as the water vapor partial pressure increased, the proton concentration and conductivity increased regardless of the dopants. Y-doped La 2 Ce 2 O 7− δ ha the highest proton concentration and conductivity.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Qi Wang,Wenyong Li,Juan Xia,Hai Wu,Lijun Wu,Jianguo Xu
The construction of DNA nanodevices is vital for disease diagnosis and biomedical study. Herein, we proposed a ternary DNA nanomachine for microRNA determination using a molecular beacon (MB) coupled Y shape probe (MB-YP). The MB-YP was a tripartite junction scaffold connected with MB-Y I , Y II , and Y III . The target miRNA firstly recognizes MB-Y I , activating the MB-Y I -DNA nanomachine to produce endogenous primer I (EP I ) responsible for the activation of Y II -DNA nanomachine. The Y II -DNA nanomachine then allows the production of numerous EP II , which in turn activates the Y III -DNA nanomachine to produce EP III for re-activating MB-Y I -DNA nanomachine. The stepwise operated MB-Y I -DNA nanomachine, Y II -DNA nanomachine, and Y III -DNA nanomachine constituted the ternary DNA nanomachine and the repeated use of EP I , EP II , and EP III permits it an all-in amplification. These features lead to the opening of MB-Y I for emitting strong fluorescence. As low as 1 fM miRNA can thus be quantitatively detected and the linear response of the miRNA is from 1 fM to 100 pM (six orders of magnitude). Moreover, the nanomachine is specific to distinguish target miRNA from one-base mutant, inserted, and deleted target analogs. Its practicability was demonstrated by confirming miRNA-21 is overexpressed in clinical human serums from lung cancer patients than healthy donors.
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MATERIALS CHARACTERIZATION
·
2023
·
IF 4.7
Jiwei Yao,Hui Yong,Yang Zhao,Chengyan Sun,Xianliu Xu,Baosheng Liu,Dongliang Zhao,Jifan Hu,Yanghuan Zhang
The Mg 90 Ce 5 Y 5 + x wt% ZnF 2 ( x = 3, 6, 10, 15) composites were prepared by mechanical ball-milling. The effects of ZnF 2 contents on the hydrogen absorption and desorption properties of Mg 90 Ce 5 Y 5 alloy were investigated by XRD , ICP-OES, TEM, PCT and DSC . The excellent hydriding-dehydriding characteristics of the samples after activation were attributed to the catalytic effect of the MgF 2 and MgZn 2 phases introduced in situ by the addition of ZnF 2 . The Mg 90 Ce 5 Y 5 + 6 wt% ZnF 2 composites exhibit the fastest hydrogen adsorption/desorption kinetics and lower decomposition temperatures. At 360 °C, 4.12 wt% H 2 can be absorbed within 180 s, and completely dehydrogenated within 740 s. In addition, the activation energy of dehydrogenation is reduced to 89.5 kJ/ mol, the optimal dehydrogenation temperature is reduced to 318 °C. It is due to the generation of in situ catalysts that weaken the Mg H bond energy, refine the grain sizes , expand specific surface area and increase hydrogen diffusion paths. However, the improvement of the thermodynamics of the composites is limited, the enthalpy is 75.9 kJ/mol H 2 .
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 46
·17281-17289
·
IF 4.39
Dayu Huang,Yue Liu,Qiuyun Ouyang,Hongzhou Lian,Jun Lin
The stability of perovskite quantum dots (PQDs) plays a vital role in practical devices. Besides silica coating, embedding PQDs in zeolites is another strategy to improve their stability significantly. Although the zeolite rigid framework has been reported to protect PQDs, there are few reports on the in situ synthesis of PQDs in zeolites. In this work, cubic phase CsPbX3 (X = Br, I) nanocrystals were successfully prepared by the ion exchange method combined with a non-polar organic trigger. Dropping a certain amount of ZnM2 (M = Br, I) solution into the intermediate product Cs4PbCl6 nanocrystals resulted in the formation of the final CsPbX3 nanocrystals. The ZnM2 solutions were prepared in non-polar solvents (hexane, octane, or chloroform). The highest photoluminescence quantum yield (PLQY) of the synthesized CsPbX3@zeolite composites can reach 83%, with a lifetime of 1.37 μs. The stability of the CsPbX3@zeolite composites thin film against damage from air and light is significantly improved. We fabricated white light-emitting diodes (WLEDs) using CsPbBr3@zeolite as the green light source and CsPbI3@zeolite as the red light source to further emphasize the practical application effect of the CsPbX3@zeolite composites. This work not only provides a new method for the synthesis of CsPbX3 nanocrystals but also involves the in situ synthesis of high stability CsPbX3@zeolite composites within the zeolite.
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JOURNAL OF FLUORINE CHEMISTRY
·
2020
·
IF 2.332
Yongyang Chen,Dan Guo,Xiaochun Dong,Yahui Li,Yixuan Huang,Hao Chen,Shanping Li
Perfluorooctanoic acid (PFOA), as a refractory organic pollutant, seriously harms the environment and damages human health. Here, the electrocatalytic method was selected to degrade PFOA. In this work, perovskite catalysts doped with different elements, and corresponding gas diffusion electrodes (GDE) were prepared by the gel-sol method and citric acid complexation method. The crystal structure, microscopic morphology, and electrochemical properties of the LaNi x Y 1-x O 3 (Y = Fe, Cu, Co, Sr) perovskite catalyst electrode were analyzed by XRD, TEM, and CV. Moreover, the electrocatalytic performances of the as-prepared electrodes were assessed by the degradation of PFOA, and the Sr-doped GDE exhibited the highest degradation rate of PFOA. The optimum degradation conditions, such as the current density, pH, and initial concentration were also investigated. It was observed that when the current density was 20 mA/cm 2 , pH was 5, and initial concentration was 0.25 mmol/L, the Sr-doped GDE had the best degradation and defluorination efficiency of PFOA reached 90.0 % and 75.1 %, respectively. High performance liquid chromatography-mass spectrometry (HPLC-MS) was used to analyze the intermediate products of PFOA degradation and obtain the degradation pathway. With the combined action of OH and O 2 , PFOA was degraded by stepwise removal of CF 2 groups, which were ultimately degraded into F − and CO 2 .
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JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 8
·4945-4951
·
IF 1.774
Li Yan,Zhang Lin-Bin,Song Shuang,Lian Xiao-Xue
Au/Y-ZnO composite with excellent acetone sensing was successfully prepared by a facile wet chemical method. X-ray diffraction analysis, field-emission scanning microscopy, and transmission electron microscopy investigation revealed that the obtained Au/Y-ZnO was mainly composed of ZnO wurtzite phase and Au nanoparticles with a face-centered structure in diameter of 10 nm, and Y atom replaced Zn lattice sites to form yttria phase. Compared with the pure ZnO and Y-doped ZnO, the Au/Y-ZnO-based sensor shows significantly enhanced acetone gas sensing. Its response to 100 ppm acetone is 27.6, which is about 2.3 and 5.5 times that of the Y-ZnO and the pure ZnO, respectively. The Au/Y-ZnO-based sensor has a low detection limit (1 ppm), and fast response (3 s) and recovery (9 s). Au modification can obviously decrease the operating temperature (275°C). The enhanced gas-sensing of Au/Y-ZnO towards acetone can be ascribed to Y Zn and V
− Zn
defects, the Schottky barrier between Au nanoparticles and Y-doped ZnO, and the catalytic activity of the Au nanoparticles.
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