BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 1.2
Yang Zelong,Yao Pengfei,Qin Haijian,Xia Qing,Yuan Bo,Zheng Chunzhi,Yang Fengli
CO oxidation has attracted much attention in the field of automotive exhaust treatment and fuel cell industrial process. In this study, NiO loaded on the Ta 2 O 5 was prepared and used to catalyze CO oxidation. And the catalyst NiO/Ta 2 O 5 was characterized by Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). The catalytic performance was evaluated and the mechanism was analyzed. The catalytic performance has been enhanced greatly by combining NiO with Ta 2 O 5 , the catalyst shows excellent activity in a wide CO concentration from 500 to 10,000 ppm, with CO conversion above 90%. In addition, NiO/Ta 2 O 5 has good stability for CO oxidation with no apparent loss of activity for 8 h. The XPS results show that oxygen defects emerged after reaction. The presence of oxygen defects is responsible for the high catalytic activity. Graphical abstract
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International Journal of Minerals Metallurgy and Materials
·
2020
·Vol. 27
·期 12
·1703-1710
·
IF 1.713
Zhou Jing,Nie Dan-dan,Jin Xian-bo,Xiao Wei
Pyrolysis of the Ta 2 O 5 /melamine mixture in molten chlorides is herein demonstrated as a facile and controllable method to nitridize and functionalize Ta 2 O 5 . The influence of the stoichiometry and composition of Ta 2 O 5 /melamine in molten salts on the nitridation process is rationalized to ensure the controllable preparation of Ta 3 N 5 and Ta 3 N 5 /TaON. The characterization results, including scanning electron microscopy, transmission electron microscopy, elemental mapping, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy, all confirm the existence of the Ta 3 N 5 /TaON heterojunction, in which the TaON nanoparticles are closely anchored to the Ta 3 N 5 nanorods. Benefiting from its composition and structure, the Ta 3 N 5 /TaON composites show enhanced photocatalytic activity for the degradation of methylene blue. The present study highlights that the molten salt method using a solid nitrogen source can be a new technique for rationalizing the design of nitrides and oxynitrides.
研究领域:
材料科学
·
环境科学
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yun Zhang,Shihua Ding,Tianxiu Song,Yingchun Zhang
Temperature stable MO-ZrO 2 -Ta 2 O 5 ceramics (M = Co, Ni) were prepared by solid state route. Crystal structure was determined by X-ray diffraction and Raman spectrum. Single-phase MZrTa 2 O 8 was formed through the reaction between intermediate MTa 2 O 6 and residual ZrO 2 . Quantitative phase analysis verified that changing temperature considerably adjusted the chemical compositions of ceramics. In the case of CoZrTa 2 O 8 , the optimum dielectric properties were ε r ∼24.3, Q × f∼ 95,300 GHz ( Q ∼11,305 at 8.43 GHz), and τ f ∼ -30.50 ppm/°C. The NiZrTa 2 O 8 ceramic had ε r = 23.5, Q × f = 86,404 GHz ( Q ∼10,774 at 8.02 GHz), and τ f = −20.20 ppm/°C. Their large τ f values were compensated since MZrTa 2 O 8 and MTa 2 O 6 had opposite τ f . Particularly, near zero τ f of −2.67 and 0.22 ppm/°C were obtained for M = Co, Ni at 1150 and 1175 °C, respectively.
研究领域:
材料科学
·
无机化学
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Binbin Zhao,Yu Liang,Wenjun Yan,Lei Liu,Jinxiang Dong
Selective hydrogenolysis of biomass-derived glycerol to 1,3-propanediol (1,3-PDO) is of significant industrial value. The conventional synthetic approach for the supported Pt–WOx catalysts with potential for industrial application generally required a high Pt loading with an aim to create more Pt–O–W interfaces owing to the difficulty in controlling the formation of active WOx species and their high dispersion on supports. In this study, a thin coating of a WOx–Ta2O5 solid solution on a Ta2O5 surface was successfully fabricated by the calcination of W-precursor-containing Ta2O5 at a high temperature (i.e., 900 °C), leading to high dispersion of low-polymeric tungsten oxide with abundant oxygen defects on the support surface. The oxygen defects of the WOx species in the WOx–Ta2O5 solid solution layer played a key role in anchoring and dispersing platinum species to maximize the Pt–O–W interface. WOx(900)/Ta2O5-supported Pt exhibits much higher catalytic efficiency toward the production of 1,3-PDO (TOF1,3-PDO = 23.2 g1,3-PDO·gPt–1·h–1) than that of WOx(500)/Ta2O5-containing Pt derived from routine calcination temperatures. Several characterization techniques were applied to examine the state change of WOx on the support by varying the calcination temperature, as well as the effect of WOx species on the dispersion and chemical states of platinum species.
研究领域:
催化化学
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材料科学
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Kai Zheng,Fanghai Lu,Qiong Long,Cuilian Shi,Xingli Zou,Zhanling Zhang,Xiaoling Zuo,Chaoyi Chen,Xiangdong Su
The direct electrolytic production of TaC nanoparticles from a Ta 2 O 5 /C precursor in molten CaCl 2 by using solid oxide membrane (SOM) technology was investigated in this work. A Ta 2 O 5 /C pellet pressed under 6 MPa was used as the cathode, and a yttria-stabilized zirconia (YSZ) tube filled with carbon-saturated liquid tin served as the anode to control the electrolysis process. The phase composition and morphology characteristics of the electrolysis products were investigated. The results show that TaC nanoparticles could be obtained directly from a Ta 2 O 5 /C mixture in molten CaCl 2 at 1000 °C and 4.0 V within 4 h.
研究领域:
材料科学
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电化学
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INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2023
·
IF 3.6
Yapeng Kong,Yu Xiao,Xuemin Liang,Yangyang Fan,Liqiang Wang,Sheng Yang,Jilin He,Yuran Chen
We report a facile approach for the synthesis of nanoscale tantalum powder through the electro-deoxidation of Ta 2 O 5 cathode in molten Na 3 AlF 6 -K 3 AlF 6 -AlF 3 . The cathodic process begins with a solid-liquid reaction between Ta 2 O 5 and the electrolyte, resulting in the formation of M x TaO 2+ x F 1- x (M = Na, K) intermediates, which are then electrochemically reduced to tantalum directly. We developed a Ta 2 O 5 cathode with a new porous structure, which contains interconnected microporous, mesoporous and macroporous structures, possessing properties such as high surface area, high pore volume ratios, and excellent accessibility to active sites. This novel cathodic pore structure material enabled the formation of uniform-sized M x TaO 2+ x F 1- x particles with a regular cubic morphology by providing abundant nucleation sites and promoting uniform growth of intermediate. The electrochemical decomposition of these particles and the nucleation, growth mechanisms of tantalum product were also investigated. Our study demonstrates the rational design and synthesis of hierarchically porous cathode materials can facilitate the controllable synthesis of nanoscale metal powders by the FFC process, and may open up new opportunities for the development of other materials with desired morphology and particle size.
研究领域:
材料科学
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电化学
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Results in Engineering
·
2026
·
IF 9.4
Guangmao Yan,Fei Wang,Yunchuan Yang,Ruiheng He,He Zhou,Jie Huo,Jun Wang,Jing Feng
Coal-series kaolin (CSK), a large-scale solid waste, has caused significant environmental pollution. Its effective conversion into high-value products remains a challenge. In this study, mullite-based ceramics featuring needle-like microstructures were controllably prepared by adding Ta 2 O 5 without the need for additional sintering acids. The resulting ceramics exhibited superior wear resistance. Ta 2 O 5 reacts with Al 2 O 3 to form Ta-O-Al chemical bridges. Combined with density functional theory (DFT) calculations and experimental data, these chemical bridges effectively lower the nucleation energy barrier for new crystalline phases and provide anchoring sites. This drives the transition from equiaxed grains to interwoven whiskers and facilitates the preferential one-dimensional anisotropic growth of the mullite phase. Due to the distinctive needle-like mullite microstructures and the pinning effect of AlTaO 4 , the wear rate decreases by 89% compared to the blank sample. These results demonstrate that Ta 2 O 5 regulates the crystal growth and friction behavior of mullite, offering an economically effective strategy for utilizing CSK.
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NANOTECHNOLOGY
·
2014
·Vol. 25
·期 21
·215401
·
IF 3.672
Lin Mao,Shenmin Zhu,Jun Ma,Dian Shi,Yixin Chen,Zhixin Chen,Chao Yin,Yao Li,Di Zhang
A H2O2-mediated hydrothermal method was developed for the fabrication of hydrophilic Ta2O5/graphene composite. The composite shows a superior H2 productivity, up to 30 mmol g−1 h−1 when used as a photocatalyst for water splitting, corresponding to an apparent quantum efficiency of 33.8% at 254 nm. This superior performance is due to the hydrophilic nature of the composite and more importantly due to the ultrafine Ta2O5 nanoparticles (about 4.0 ± 1.5 nm) which are covalently bonded with the conductive graphene. The hydrophilic property of the composite is attributed to the use of H2O2 in the hydrothermal process. The ultrafine size of the Ta2O5 particles which are covalently bonded with the graphene sheets is attributed to the use of sonication in the synthesis process. Furthermore, the hydrophilic Ta2O5/Gr composite is durable, which is beneficial to long term photocatalysis. The strategy reported here provides a new approach to designing photocatalysts with superior performance for H2 production.
研究领域:
材料科学
·
能源化学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiale Wu,Xinyu Zhao,Jin Hu,Zhongshan Deng,Yongjin Feng,Hongtao Fan,Junkai Li,Qingming Chen,Kaijun Wang,Kaizhao Wang
Considering the growing hazards of ionizing radiation, developing new shielding glass systems is essential to increase radiation safety and diversity of material choices in the real-time monitoring field. Based on the excellent comprehensive performance exhibited by high-entropy oxide glasses (HEOGs) due to its unique component composition and high-entropy effect, B 2 O 3 -TeO 2 -BaO-Bi 2 O 3 -MO (W, Ta, Dy, Mo) HEOGs with heavy metal oxides as the fifth component were prepared via the melt-quenching process. Physical, structural, and optical properties analysis show that the tantalum pentoxide (Ta 2 O 5 )-optimized HEOG has higher densification, more continuous and compact network filling, and wider indirect optical bandgap (Eg) than other glasses. The radiation attenuation ability of HEOGs was evaluated utilizing the MCNPX simulation and Phy-X program. The minimum specific lead equivalent (PbE) value of all heavy metal HEOGs in the entire photon energy range (10 −3 –10 3 MeV) is much higher than all types of commercial lead glass in service, showing excellent comprehensive attenuation ability for X-rays, γ-rays, and fast neutrons. In addition, the addition of Ta 2 O 5 dramatically shortens the path and attenuation times required for incident photons to annihilate inside the material due to the density increase effect brought by the high atomic number and high density. In the 100 MeV nuclear radiation area and the 0.08 MeV medical X-ray application zone, only 10 cm and 0.3 cm thickness are needed to achieve saturated absorption of photons.
研究领域:
材料科学
·
核物理
·
光学工程
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Coatings
·
2023
·Vol. 13
·期 5
·811
·
IF 3.4
Jiajia Yin,Bin Fan,Junfeng Du,Hu Yang,Jiang Bian
In this study, a lightweight composite polyimide film optic with antireflective coating was prepared using an ion-beam-assisted reactive sputtering method. It exhibited high transmittance in visible (87%, 0.5~0.8 μm), short (86%, 1.8~2.7 μm) and middle (78%, 3.3~5.4 μm) wavelength infrared regions. Additionally, it also showed great optical homogeneity (0.006 λ in RMS and 0.034 λ in PV, λ = 632.8 nm) with smooth surfaces (RMS = 0.786 nm). The thermal stability of the polyimide film was also effectively maintained after the antireflective coating. At the same time, by utilizing the hydrophobic properties of coating materials (Ta2O5/SiO2), the antireflective layer acted as an effective water barrier on the film surface to reduce the water absorption.Keywords:composite polyimide film;Ta2O5/SiO2antireflective coating;high transmittance;visible;infrared
研究领域:
光学材料
·
薄膜技术
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高影响因子
Advanced Science
·
2019
·Vol. 6
·期 12
·1900310
·
IF 15.804
Lili Yang,Yusi Peng,Yong Yang,Jianjun Liu,Haoliang Huang,Bohan Yu,Jimin Zhao,Yalin Lu,Zhengren Huang,Zhiyuan Li,John R. Lombardi
Recent achievements in semiconductor surface-enhanced Raman scattering (SERS) substrates have greatly expanded the application of SERS technique in various fields. However, exploring novel ultra-sensitive semiconductor SERS materials is a high-priority task. Here, a new semiconductor SERS-active substrate, Ta 2 O 5 , is developed and an important strategy, the “coupled resonance” effect, is presented, to optimize the SERS performance of semiconductor materials by energy band engineering. The optimized Mo-doped Ta 2 O 5 substrate exhibits a remarkable SERS sensitivity with an enhancement factor of 2.2 × 10 7 and a very low detection limit of 9 × 10 −9 m for methyl violet (MV) molecules, demonstrating one of the highest sensitivities among those reported for semiconductor SERS substrates. This remarkable enhancement can be attributed to the synergistic resonance enhancement of three components under 532 nm laser excitation: i) MV molecular resonance, ii) photoinduced charge transfer resonance between MV molecules and Ta 2 O 5 nanorods, and iii) electromagnetic enhancement around the “gap” and “tip” of anisotropic Ta 2 O 5 nanorods. Furthermore, it is discovered that the concomitant photoinduced degradation of the probed molecules in the time-scale of SERS detection is a non-negligible factor that limits the SERS performance of semiconductors with photocatalytic activity.
研究领域:
材料科学
·
光学
·
分析化学
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DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 7
·3174-3183
·
IF 2.3
Xia Qing,Qin Haijian,Xia Feifei,Yao Pengfei,Zheng Chunzhi,Zhao Songjian,Zhang Huabing,Yang Fengli
CO oxidation at mild condition is significant for industrial process but still challenging nowadays, especially for the non-noble metal catalysts. The preparation method significant affect the catalytic activity of the catalyst. Comparing with cobalt supported on tantalum oxide prepared by impregnation method, Co/Ta 2 O 5 prepared by deposition–precipitation method with urea in this study has smaller particle size, higher specific surface area and better redox properties, and these features make the catalyst exhibit higher catalytic activity for CO oxidation at mild condition. 90% CO conversion was achieved at 130 ℃, and CO was fully converted at 150 ℃. The XPS and DRIFTs results show that Co/Ta 2 O 5 has more oxygen vacancies, and the absorbed CO will react with oxygen. The study may provide a new thought for the preparation of catalysts with high activity at mild condition. Graphical
Co/Ta 2 O 5 prepared by deposition–precipitation with urea catalyzes the oxidation of CO
研究领域:
催化
·
材料科学
·
环境化学
·
化学工程
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高影响因子
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