JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Kai Fan,Han Fu,Yuzhou Zhao,Yu Gao,Jianwen Su,Chengliao Deng,Shijie Sun,Yusha Lan,Ming Qin,Xiaoming Cai,Hongtao Guan,Jinming Cai
Reduced graphene (rGO) aerogel shows great potential as electromagnetic (EM) wave absorbers due to its lightweight feature and strong EM attenuation ability resulted from high conductivity. However, excessive conductivity and sole EM wave loss mechanism of rGO aerogel make it difficult to balance impedance matching characteristic as well as EM attenuation characteristic, restricting the construction of broadband absorbers. Herein, serial transition metal ions doped core-shell Cr 2 O 3 hollow spheres were prepared and incorporated with rGO to resolve above issue. The introduction of hollow structured Cr 2 O 3 component not only retains lightweight but also induces multiple loss mechanisms to strengthen EM wave dissipation. It was found that species of doping element played significant role on determining EM wave absorption performance of composites. Thereinto, Co doped core-shell Cr 2 O 3 hollow spheres/rGO aerogel delivered the best EM wave absorbing capacity with effective absorption bandwidth of 6 GHz and minimum reflection loss of -57.06 dB. The excellent EM wave absorption performance originated from the best impedance matching characteristic and the strongest attenuation capacity due to Co doping. This work offers a novel insight into the preparation of lightweight and high-performance Cr 2 O 3 /rGO aerogel EM wave absorbing composites and its potential application area in the field of radar microwave stealth.
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高影响因子
PLASMA SCIENCE & TECHNOLOGY
·
2022
·Vol. 24
·期 12
·124017
·
IF 1.842
Xinluo TIAN,Heping LI,Liyu ZHENG,Fangjian LI,Zhongyang ZHENG,Shengming YIN,Xinyun WANG,Youwei YAN
In this study, a Cr2O3 nanosheet (Cr2O3 NS) inserted Cr-Zr-O coating was developed as a hydrogen isotope permeation barrier. The Cr2O3 NSs, fabricated by rapid heat treatment, were amorphous with a thickness of only several nanometers. These Cr2O3 NSs were then incorporated into a Cr-Zr-O multi-metal oxide composite coating via a dip-coating method to form a coating. The effect of the Cr2O3 NS concentration on the morphology, microstructure and deuterium permeation resistance of the coating was studied. With the addition of 1.0 g l−1 Cr2O3 NSs, compared with the Cr-Zr-O coating without NSs, the permeation reduction factor of the resultant coating was enhanced from 249 °C to 575 °C at 500 °C. The coating, with a thickness of nearly 193 nm, achieved a comparable deuterium resistance that was above two orders of magnitude higher than the steel substrate. The results show that ceramic NSs can serve as effective fillers for enhancing the coating performance when functioning as a hydrogen isotope barrier.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jing Feng,Gang Lang,Tingting Li,Jing Zhang,Jun Zhao,Wei Li,Weiqing Yang,Zhenju Jiang
Coordination-driven self-assembly has emerged as a smart strategy to prepare advanced materials for various applications. Here we coat Ni(II)-tannic acid complexes on the lab-made C-Cr 2 O 3 nanoparticles by this strategy, and demonstrate that this novel coating dramatically accelerate the charge transfer and thus enhance the amperometric responses for electrochemical detection of glucose and hydrazine. The charge-transfer rate ( k s ) of the obtained C-Cr 2 O 3 @Ni-MPN is much higher than that of C-Cr 2 O 3 substrate, evaluated as 1.00 and 0.82 s −1 respectively. The physicochemical and electrochemical characterizations demonstrate that the enhanced k s of C-Cr 2 O 3 @Ni-MPN is attributed to the electronegativity and the network structure of its surface. Correspondingly, C-Cr 2 O 3 @Ni-MPN exhibits superior sensitivity (5043.3 μA mM −1 cm −2 ) and ultra-low detection limit (0.02 μM) for the glucose detection, as well as high sensitivity (918.5 μA mM −1 cm −2 ) and ultra-low detection limit (0.04 μM) for the hydrazine detection. Furthermore, C-Cr 2 O 3 @Ni-MPN exhibits the excellent selectivity, stability and reproducibility, and the powerful reliability for analyzing the plasma samples. This study constructs an appropriate hierarchical structure towards catalyzing the electrochemical oxidation of targets, which achieves the amplification of the respond current and thus an ultra-sensitive electrochemical detection for the targets.
研究领域:
材料科学
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分析化学
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生物医学工程
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高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Qiaoqi Guo,Jun Xu,Ying Luo,Yang Yang,Zheng Wang,Hong He
The concept of photocatalytic CO2 conversion provides simultaneous solutions for global warming mitigation and fuel generation, while the lack of efficient photocatalysts restrains the development of photocatalytic CO2 conversion. AgTaO3 with the appropriate band position for CO2 reduction has been used as an active photocatalyst for one-step excitation overall water splitting. Therefore, if there are suitable reduction active sites on the surface, AgTaO3 can be expected to conduct photocatalytic reduction of CO2. Herein, we first discovered the photocatalytic activity of AgTaO3 for CO2 conversion with H2O. Through the optimization of synthesis conditions and surface modification with various cocatalysts by different approaches, AgTaO3 with Ag cocatalyst loaded by photodeposition showed the highest activity for CO production among those with Pt, Rh, or Cu cocatalysts. When combining core/shell structured metal nanoparticles and Cr2O3, AgTaO3 photocatalyst exhibited CH4 evolution activity in photocatalytic conversion CO2, indicating Cr2O3 species promoted the hydrogenation process of CO2 reduction. This study demonstrated that cocatalyst decoration controlled the conversion products and played an important role in the multielectron photoreduction of CO2.
研究领域:
材料科学
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环境科学
·
化学
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高影响因子
Nanoscale
·
2023
·Vol. 15
·期 41
·16741-16751
·
IF 6.7
Jin Song,Fenglong Wu
The hydrolysis of ammonia borane (NH3BH3) on metal-based heterogeneous catalysts under light irradiation has been considered as an efficient technique for hydrogen (H2) generation, in which the activity of the catalyst can be improved by increasing the electron density of the active metal. However, studies focused on reducing the electron density of the active metal are rare. Here, we report an electron density manipulation strategy to prepare highly electron-deficient ultrathin Co nanosheets via transferring nanosheets to support mesoporous Cr2O3 by simple one-step in situ reduction (denoted as Co/Cr2O3). X-ray photoelectron spectroscopy (XPS) and X-ray absorption near-edge structure (XANES) spectra confirm the formation of electron-deficient Co nanosheets and the Co–O–Cr bond due to electron transfer from the nanosheets to mesoporous Cr2O3. Importantly, the Co–O–Cr bond can work as a bridge to accelerate the electron transfer under light irradiation and then improve the electron-deficiency degree of Co nanosheets. As a result, the optimal Co/Cr2O3 exhibits a high intrinsic catalytic performance with the turnover frequency (TOF) value of 106.8 min−1 and significantly reduces the activation energy (Ea) to 16.8 kJ mol−1 under visible light irradiation, which make it among the best ever recorded monometallic Co-based catalyst with enriched electrons. The density functional theory (DFT) calculation results suggest that the electron-deficient Co nanosheets are responsible for the greatly decreased H2O activation and dissociation energy barriers and then the acceleration of the evolution of H2. The work provides a new perspective for designing high efficiency catalysts for H2 production, which is beneficial for relative energy conversion and storage catalysis.
研究领域:
材料科学
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催化化学
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能源转换与存储
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Zhengjia Zhu,Hui Chen,Yushuai Bai,Jingjie Zhang,Mingdong Yi,Zhaoqiang Chen,Guangchun Xiao,Chonghai Xu
ZTA/Cr 2 O 3 ceramics were fabricated by gelcasting via gelcasting followed by pressureless sintering. The effects of pH, dispersant content, ball-milling time, solid loading, and Cr 2 O 3 content on slurry rheological properties, green body properties, sintering densification behavior, and mechanical properties were investigated. The addition of Cr 2 O 3 effectively decreased slurry viscosity and improves flowability, facilitating the preparation of high-solid-loading slurries. The green body relative density and flexural strength reached optimum values at a solid loading of 54 vol%, reaching 54.83% and 19.7 ± 0.27 MPa, respectively. After sintering at 1600 °C for 3 h, the optimum mechanical properties were obtained at a Cr 2 O 3 content of 0.4 vol%. The Vickers hardness, flexural strength, and fracture toughness were 17.17 ± 0.26 GPa, 581.22 ± 9.20 MPa, and 6.59 ± 0.32 MPa m 1/2 , respectively. Compared with Cr 2 O 3 -free ZTA ceramics, the hardness, flexural strength, and fracture toughness increased by 5.5%, 17.58%, and 10.75%, respectively. The enhanced mechanical properties are mainly attributed to the synergistic effects of the solid-solution incorporation of Cr 3+ in the α-Al 2 O 3 lattice, the resulting changes in lattice parameters, grain refinement, improved densification, and enhanced stability of the t-ZrO 2 phase. Furthermore, complex-shaped ZTA/Cr 2 O 3 ceramic components were successfully fabricated, showing no visible defects and uniform shrinkage after sintering, providing useful guidance for the near-net-shape fabrication of high-performance ceramic components.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Siyuan Li,Yang Yu,Haojie Duan,Dong Yue,Yu Feng
Bi-free ZnO-SrCO 3 -Cr 2 O 3 -Co 3 O 4 based varistor ceramics with the composition (97.4- x ) mol% ZnO-2 mol% SrCO 3 -0.1 mol% Cr 2 O 3 -0.5 mol% Co 3 O 4 - x mol% MnO 2 ( x = 0–0.7) were prepared by a conventional solid-state reaction method. The effects of MnO 2 on the microstructure, grain-boundary barriers and nonlinear electrical properties were systematically investigated. MnO 2 addition induced a non-monotonic change in ZnO grain size, altered the morphology and distribution of the Sr rich intergranular phases, and promoted the formation of crystalline Sr 2 Mn 2 O 5 at x ≥ 0.5 mol%. The sample with x = 0.5 mol% exhibited the best initial nonlinear electrical characteristics among the compositions investigated, with E 1 mA = 614 ± 18 V/mm, α = 33.2 ± 1.7, J L = 3.66 ± 0.37 μA/cm 2 , and ϕ b = 0.866 ± 0.022 eV. Further increasing the MnO 2 content increased the Sr 2 Mn 2 O 5 phase fraction and refined the ZnO grains but reduced the nonlinear coefficient, indicating that the electrical response depended on the combined effects of phase composition, Sr-rich intergranular morphology, grain size, and grain-boundary-related electrical characteristics rather than on the amount of Sr 2 Mn 2 O 5 alone. These results demonstrate that appropriate MnO 2 addition can effectively regulate the microstructure and grain boundary related electrical response of Sr-Cr-based varistor ceramics.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Ling-Ling Wang,Lei Bian,Hao Tian,Shi-Ze Liu,Ke-Xin Li,Xin Wang,Zhong-Li Wang
Electrochemical CO 2 reduction in acidic electrolyte is a potential strategy for efficient CO 2 utilization by preventing the formation of carbonate, but it remains a great challenge to improve the selectivity of CO 2 reduction in acidic electrolytes due to the competitive hydrogen evolution reaction . Herein, we demonstrate Ag 2 CrO 4 derived Ag–Cr 2 O 3 composite catalyst with local alkaline microenvironments for enhanced selectivity of CO 2 to CO product in an acidic KCl electrolyte. Under the electrochemical reduction of CO 2 , the Ag 2 CrO 4 pre-catalyst undergoes a chemical transformation induced by chloride ions to generate AgCl–Cr 2 O 3 , meanwhile, AgCl is electrochemically reduced Ag to form a Cr 2 O 3 coated Ag composite catalyst with rich Ag–Cr 2 O 3 interfaces. The Ag–Cr 2 O 3 gas diffusion electrode constructed from carbon nanopowder effectively increases the hydrophobicity of the electrode, and the optimized electrode exhibits high CO Faradaic efficiency (FE) (over 75%) at a wide current density of 50–300 mA cm -2 and achieves a maximum FE of 86.7% toward CO product at 300 mA cm -2 . The in situ Raman spectroscopy reveals that Cr 2 O 3 can adsorb OH − which regulates the local alkaline environment to promote the CO 2 adsorption on the Ag–Cr 2 O 3 interface and stabilize the *CO 2 - /*COOH intermediates in the acidic electrolyte. This work provides an effective strategy to tune the reaction interfaces for CO 2 reduction in acidic electrolytes.
研究领域:
电化学
·
材料科学
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高影响因子
MOLECULES
·
2019
·Vol. 24
·期 2
·361
·
IF 3.06
Haili Wang,Wenfeng Han,Xiliang Li,Bing Liu,Haodong Tang,Ying Li
Cr2O3nanoparticles were prepared by solution combustion synthesis (SCS) with chromium nitrate as the precursor and glycine as the fuel. Commercial Cr2O3and Cr2O3prepared by a precipitation method were also included for comparison. The morphology, structure, acidity and particle size of fresh and spent Cr2O3catalysts were investigated by techniques such as XRD, SEM, TEM, BET and NH3-TPD. In addition, catalytic performance was evaluated for the dehydrofluorination of 1,1,1,3,3-pentafluoropropane (CF3CH2CHF2, HFC-245fa) to 1,3,3,3-tetra-fluoropropene (CF3CH=CHF, HFO-1234ze). The catalytic reaction rate of Cr2O3prepared by SCS method is as high as 6 mmol/h/g, which is about 1.5 times and 2 times higher than that of precipitated Cr2O3and commercial Cr2O3, respectively. The selectivity to HFO-1234ze for all the catalysts maintains at about 80%. Compared with commercial and precipitated Cr2O3, Cr2O3-SCS prepared by SCS possesses higher specific surface area and acid amount. Furthermore, significant change in the crystal size of Cr2O3prepared by SCS after reaction was not detected, indicating high resistance to sintering.
研究领域:
材料化学
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催化化学
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纳米材料科学
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环境友好化工
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氟化学
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高影响因子
Frontiers in Chemistry
·
2021
·
IF 5.221
Zhaohuan Wei,Zhiyuan Zhang,Yaqi Ren,Hong Zhao
A high energy efficiency, low charging voltage cathode is of great significance for the development of non-aqueous lithium-oxygen batteries. Non-stoichiometric manganese dioxide (MnO2-x) and chromium trioxide (Cr2O3) are known to have good catalytic activities for the discharging and charging processes, respectively. In this work, we prepared a cathode based on Cr2O3 decorated MnO2-x nanosheets via a simple anodic electrodeposition-electrostatic adsorption-calcination process. This combined fabrication process allowed the simultaneous introduction of abundant oxygen vacancies and trivalent manganese into the MnO2-x nanosheets, with a uniform load of a small amount of Cr2O3 on the surface of the MnO2-x nanosheets. Therefore, the Cr2O3/MnO2-x electrode exhibited a high catalytic effect for both discharging and charging, while providing high energy efficiency and low charge voltage. Experimental results show that the as-prepared Cr2O3/MnO2-x cathode could provide a specific capacity of 6,779 mA·h·g−1 with a terminal charge voltage of 3.84 V, and energy efficiency of 78%, at a current density of 200 mA·g−1. The Cr2O3/MnO2-x electrode also showed good rate capability and cycle stability. All the results suggest that the as-prepared Cr2O3/MnO2-x nanosheet electrode has great prospects in non-aqueous lithium-oxygen batteries.
研究领域:
电化学
·
材料科学
·
能源存储
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纳米材料
·
催化化学
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高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Meng Zhao,Tianbao Zhao,Tao Cheng,Zihan Su,Jiayi Zheng,Zhiming Liu,Linhua Liu,Jia-Yue Yang
The quest for biomimetic materials that emulate the solar spectral response of green plants has garnered substantial attention. Herein, we combined density-functional theory with on-site Coulomb corrections and spectroscopic ellipsometry to obtain the complex dielectric functions of chromium oxide (Cr 2 O 3 ) pigment and polyurethane (PU) binder, respectively. Based on the Lorenz-Mie scattering theory and two-flux method considering anisotropic scattering, we systematically studied the regulatory mechanism of particle structural parameters on the reflectance spectrum of the biomimetic coating. The results show that optimizing the structural parameters of Cr 2 O 3 particles reproduces the canonical vegetation features in the visible-near-infrared region. Coating reflectance decreases monotonically with both increasing particle volume fraction and larger mean radius. Additionally, the slope of red edge can be independently tuned by the particle size distribution, i.e. a larger proportion of small particles steepens the red-edge slope. This study provides a theoretical basis and data support for further optimizing the similarity between biomimetic coatings and natural vegetation in terms of their hyperspectral images in the visible-near infrared spectral range.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hang Liu,Shengqiang Song,Rundong Jing,Mithun Nath
Recently, in the Al 2 O 3 –CaO–Cr 2 O 3 system, a Cr 3+ ternary phase named wuboraite (CaAl 2 Cr 2 O 7 ) was synthesized for the first time in an air atmosphere, which later showed an undetermined hint of solid solubility between Cr 3+ and Al 3+ in different atmosphere. In the present investigation, the solubility limits (or x values) of the CaAl 2± x Cr 2± x O 7 were determined by conducting high-temperature equilibrium experiments in both air and N 2 atmospheres with the various proportionate mixtures of CaO, Al 2 O 3 , and Cr 2 O 3 , and subsequently using powder X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) analysis. In the air atmosphere, the Cr richest end-member of the Wuboraite solid solution phase is CaAl 1.77 Cr 2.23 O 7 (or x = 0.23), while that of Al richest end-member is CaAl 2.18 Cr 1.82 O 7 (or x = 0.18). Whereas, in the N 2 atmosphere, the Cr richest end-member of the wuboraite solid solution phase is CaAl 1.77 Cr 2.23 O 7 (or x = 0.23), while that of Al richest end-member is CaAl 2.15 Cr 1.85 O 7 (or x = 0.15).
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高影响因子
危险品化学品经营许可证（带存储）