International Journal of Applied Ceramic Technology
·
2015
·Vol. 13
·期 3
·506-510
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IF 1.32
Daixiong Zhang,Xueming Li,Yuhua Zhu,Xiaogang Guo,Hongyun He
The coating of nano-Cr 2 O 3 was successfully fabricated via aqueous electrophoretic deposition (EPD). The deposition behavior aqueous nano-Cr 2 O 3 suspension was affected by the added amount of nitric acid. The morphology of electrophoretic Cr 2 O 3 coating was significantly influenced by the deposition voltage. For a suitable EPD, stable aqueous nano-Cr 2 O 3 suspension could be obtained by the addition of 0.0025 M nitric acid, and the suitable deposition voltage was 5 V. For the purpose of increasing deposition rate which was limited by lower deposition voltage, it was suggested to employ higher suspension concentration of Cr 2 O 3 .
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 4
·1011-1020
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IF 2.5
Zhang Dongxing,Zou Jie,Li Fuan,Yuan Tao,Su Yuanjie,Jian Jiawen
Mixed-potential type ammonia sensors based on yttria-stabilized zirconia are promising devices in NO x reducing system for high-temperature exhaust. However, selectivity is a critical issue that should be urgently addressed. Herein, a novel bilayer Cr 2 O 3 |In 2 O 3 sensing electrode (SE) was designed to improve the selectivity of the ammonia sensor, in which an additional Cr 2 O 3 layer was deposited on In 2 O 3 SE. The selectivity was examined in NH 3 , CO, NO and NO 2 . Finally, the sensor with the bilayer Cr 2 O 3 |In 2 O 3 SE exhibits an improvement of NH 3 selectivity at 600 °C, which is attributed to the Cr 2 O 3 layer catalysing the removal of CO and NO x before the gases reach the triple-phase boundaries (TPBs). Furthermore, the mixed-potential model of the NH 3 sensor with the bilayer SE was identified using the polarization curves obtained in different concentrations of NH 3 . Additionally, the proposed sensor displayed a good repeatability and resistances to CO 2 and H 2 O. This innovative bilayer Cr 2 O 3 |In 2 O 3 SE is expected to be applied in high-temperature NH 3 detection.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 33
·16035-16039
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IF 3.925
Jing Zhang,Chunlei Li,Xingzhi Jin,Yi Zheng
Shape anisotropic semiconductors are advanced catalysts for resolving energy crises. However, modification studies are still needed to overcome their intrinsic disadvantages, such as the lack of active sites. With this aim, an excellent hydrogen evolution photocatalyst Rh@Cr2O3-loaded PbMoO4 twenty-six facet polyhedron (PM/Rh@Cr2O3) has been synthesized by a liquid method. Based on XPS, electrochemical investigation and hydrogen evolution reaction (HER) test, it is demonstrated that Rh acts as an electron collector and active site; moreover, Cr2O3 can assist Rh in the dissociation of water. In addition, Cr2O3 can also inhibit the reverse reaction of water splitting as well as the mass transfer of water. In conclusion, the H2 yield rate increased from 0 μmol g−1 h−1 of PbMoO4 (PM) to 704 μmol g−1 h−1 of PM/Rh@Cr2O3, and PM/Rh@Cr2O3 exhibited excellent photo-stability.
研究领域:
材料科学
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能源化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 50
·35562-35568
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IF 3.9
Fenglong Wu,Jin Song
Herein, we synthesized a hydrophilic support formed from amorphous Cr2O3 and KIT-6 containing P123 using a simple solvent-free thermal method for Co species. The obtained catalyst (denoted as Co/Cr2O3-F-X) exhibits high activity for hydrogen production from ammonia borane (NH3BH3). The optimal Co/Cr2O3-F-0.5 exhibits the highest catalytic performance with the turnover frequency (TOF) value of 111.1 min−1. Advanced characterizations suggest the high catalytic performance is attributed to the synergistic effect of the strong interaction between amorphous Cr2O3 and KIT-6 containing P123 and improved wettability of the catalyst.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Sen Tian,Xuemei Ye,Yaping Dong,Wu Li,Bo Zhang,Bo Li,Haitao Feng
To synthesize Cr 2 O 3 from ferrochromium, the electrolysis of ferrochromium in an electrolyzing cell and the properties of Cr 2 O 3 prepared by thermal decomposition of (NH4)2CrO 4 were studied. Experimental results showed that with a 1:5 molar ratio of NH 3 ∙H 2 O:2CrO 4 2- and current density of 140 A/m 2 at room temperature, Cr and Fe can be completely separated by solid-liquid separation, and (NH 4 )2CrO 4 can be obtained. The optimized current efficiency was 62%. The four-step thermal decomposition process of (NH 4 )2CrO 4 was analyzed by TG-DTA. The XRD and FTIR results proved that crystalline Cr 2 O 3 with a fine particle size was obtained. Spherical Cr2O3 with a particle size of 71~216 nm and a specific surface area of 4~38 m 2 /g was confirmed by SEM and BET. UV-Vis results proved that Cr2O3 presented bright green (L*=34.78~49.97, a*=0.91~-14.73, and b*=6.08~17.92), and the forbidden band width was 1.91~2.25 eV. The purity of Cr 2 O 3 was over 99%.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2022
·
IF 4.778
Lingli Ji,Qixing Xiao,Lijun Zhu,Sridhar Komarneni,Jianfeng Ma
Carbon dots (CDs)-modified Cr 2 O 3 (CDs@Cr 2 O 3 ) composites were synthesized by solvothermal process followed by calcination to improve their catalytic performance. The physical and chemical properties of the composites were determined by XRD , SEM , TEM, BET and XPS . With the aid of sodium persulfate, the activity of CDs@Cr 2 O 3 to oxidize Orange II by non-radicals was studied under various conditions. The experimental results determined the optimal dosage of PDS to be 0.1 g and the degradation results showed that after 45 min, the degradation rate of Orange II reached to 98.4% with the CDs@Cr 2 O 3 /PDS/Vis system. The adsorption capacity of CDs@Cr 2 O 3 for Orange II was closely related to pH, and this phenomenon is further explained by the isoelectric point. A series of experiments proved that non-free radicals played a crucial role in the oxidation process , in which singlet oxygen ( 1 O 2 ), superoxide radical (O 2 •− ) and photo-generated holes (h + ) were determined as the important reactive oxygen species (ROS). In addition, the present study found that increasing dissolved oxygen could promote the reaction and the catalyst maintained good degradation performance after five cycles suggesting its stability.
研究领域:
环境科学
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催化材料
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产品关联
DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
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2024
·
IF 2.5
Yadong Cheng,Liaoying Zheng,Huarong Zeng,Tian Tian,Xue Shi,Zhenyong Man,Xuezheng Ruan,Guorong Li,Min Zhu
Low working voltage-driven ZnO-based varistor ceramics play an important role in the multilayer chip varistors, which require a low sintering temperature of ZnO varistor for its low energy consumption. Herein, a remarkable reduction of the sintering temperature from the usual 1100–1300 °C to 950 °C is successfully achieves in the ZnO ceramics via a certain 0.05 mol% of Cr 2 O 3 dopants. The underlying mechanism is found to be involved with the formation of basal-plane inversion boundaries between the ZnO grains, which can promote the rapid grain growth within the ceramics. Furthermore, the ZnO varistors with 0.05 mol% Cr 2 O 3 dopant exhibit excellent performance. A low breakdown voltage of 416 V mm −1 , a high nonlinear coefficient of 39, and a low leakage current of 3.4 μA are obtained simultaneously. This work presents an effective and promising approach for the cost-efficient preparation of high-performance ZnO-based varistors, which have particular significance for the application of multilayer chip varistors with low working voltage.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
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2024
·
IF 7.6
Shuxian Zhuang,Wangqiao Chen,Bing Li,Tong Zhang,Yujie Song
Targets can achieve invisibility in the vegetation environments by simulating the reflection spectra of plant green leaves. However, balancing the accuracy and stability of simulation effects, particularly in simulating spectral features caused by water in the leaves, is often challenging. Herein, polyurethane microcapsules encapsulating liquid water (W-PUMCs) were prepared by inverse emulsion polymerization, then mixed with Cr 2 O 3 in specific proportions into the epoxy resin matrix to obtain a material capable of simulating the reflection spectra of green leaves in the visible and near-infrared bands. The normalized similarity (NS) between the spectrum of this material and that of plant (cherry) green leaf can reach 0.9779 in the range of 400–2500 nm. W-PUMCs are used to simulate the spectral characteristics caused by water in the leaves because the spectral NS between W-PUMCs and the green leaf in the 1100–2200 nm range is 0.9930. Cr 2 O 3 is employed to simulate the other major spectral features of green leaves. This strategy guarantees simulation accuracy while simplifying the preparation process and reducing production costs and providing solutions to spectral simulation in the fields of military stealth and ecological protection.
研究领域:
植物学
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材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Sustainable Metallurgy
·
2023
·Vol. 9
·期 3
·1303-1314
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IF 2.4
Lv Ningning,Qiu Yuchao,Hu Yiming,Shi Hangkai,Shi Junjie,Ding Xiang,Li Haolun
It has been proved that Cr 2 O 3 is favorable to promote the crystallization of perovskite in the Selective Crystallization and Phase Separation (SCPS) process. However, the related thermodynamic data of equilibrium phase relations was quite limited. In the present work, the equilibrium phase relations of CaO-SiO 2 -TiO 2 system with the addition of 5 wt% Cr 2 O 3 were experimentally carried out using the high temperature equilibration-quenching technique followed by X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM–EDS), as well as thermodynamic calculation. More attention has been focused on the influence of 5 wt% Cr 2 O 3 addition on the liquid-perovskite two-phase coexisting region. The results indicated that the crystallization of perovskite was promoted by Cr 2 O 3 addition by expanding the primary phase of perovskite toward higher SiO 2 areas. Meanwhile, distinct discrepancies were found when the present experimental results were compared with the data from the literature and the isotherms calculated by FactSage, indicating that the present results are not only meaningful for the improvement of the SCPS process, but also important for the optimization of titania related oxide thermodynamic database. Graphical Abstract
研究领域:
冶金学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lijun Guo,Jieting Zhao,Liming Zhao,Yuling Tang,Jianfei Zhou,Bi Shi
Carbonaceous materials have attracted considerable attention as promising catalysts of persulfate (PS) activation for antibiotic degradation. In this work, an environment-friendly and low-cost carbonaceous material (Cr 2 O 3 /BC) was prepared by pyrolyzing chrome shavings, and the catalytic ability of Cr 2 O 3 /BC for PS activation was evaluated using tetracycline (TC) as the model antibiotic. The Cr 2 O 3 /BC/PS system exhibited ultrafast TC removal efficiency (99.9% removal rate within 5 min), which was owing to persistent free radicals, defective sites, and dispersed Cr 2 O 3 particles, which were beneficial for the generation of free radicals, such as OH·, SO 4 ·- , ·O 2 – and 1 O 2 . Coexisting substances, such as inorganic ions and humic acid, exerted little effect on TC removal. In addition, 99.9% of TC removal rates were achieved in TC contaminated tap water. Cr 2 O 3 /BC/PS system also exhibited the high removal rates towards ciprofloxacin (98% removal rate within 5 min) and sulfadiazine (99.8% removal rate within 5 min). Surprisingly, no chromium was detected after TC degradation, indicating that no secondary pollution was generated. This work provides a feasible strategy for the high-value use of chrome shavings and a practical method for antibiotic removal.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2022
·
IF 5.477
Bingying Gao,Chao Yao,Linqiang Mao
Background Advanced aerogels with lightweight, flame retardant and rapid cooling properties are urgently needed as thermal insulators in harsh environments. Method The Cr 2 O 3 −Al 2 O 3 aerogels were fabricated by simple method and freeze-dried process. A large number of pores were produced in the microstructure of samples by carbonization of soluble starch during calcination. Findings The porous structure makes the density of prepared Cr 2 O 3 −Al 2 O 3 aerogel as low as 0.0060 g·cm −3 and the thermal conductivity as high as 0.30 W m −1 ·K −1 , which indicates that the sample has good thermal dissipation and rapid cooling performance. The effect of calcination temperature on cooling rate was studied. The results show that material cooling can be divided into two stages, the second stage is the speed control step. With the increase of the calcination temperature, the cooling rate of sample improves and the cooling time decreases. The prepared Cr 2 O 3 −Al 2 O 3 aerogels have good flame retardancy and cannot ignite upon exposure to the burner for 2 min. The flame retardancy and rapid cooling mechanism of the sample was also studied. The Cr 2 O 3 −Al 2 O 3 aerogels have the advantages of lightweight, flame retardancy and rapid cooling, which has potential application prospects in the field of flame retardant cooling coatings.
研究领域:
材料科学
·
热能工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
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IF 3.84
Han Jin,Youju Huang,Jiawen Jian
Selective sensing of nitric oxide (NO) in exhaust for so far reported exhaust gas sensors, particularly, without any interference from the coexist hydrocarbons (e.g., C 3 H 6 ) is still a challengeable issue. In this research, Cr 2 O 3 with various microstructures were successfully synthesized via hydrothermal route and used as sensing-electrodes (SEs) for detection of NO at high temperatures. Surprisingly, Cr 2 O 3 with plate-like microstructure demonstrated high selectivity towards NO against C 3 H 6 . In addition, the sensing performance of the plate-like Cr 2 O 3 towards NO was found to be unaffected by the change of oxygen concentration at 475 °C.
研究领域:
材料科学
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环境科学
·
传感器与执行器
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）