JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 5
·5008-5013
·
IF 2.195
Du Liting,Liu Li,Tang Xiaonian,Li Yu,Xu Suyan,Gong Yimin,Yang Yang
Pure Fe 2 O 3 microspheres and Gd 2 O 3 /Fe 2 O 3 loose microspheres were synthesized successfully by a facile hydrothermal method and followed with calcined. The structure and elemental composition were provided by the X-ray powder diffraction (XRD) and energy-dispersive spectroscopy (EDS). Additionally, the morphology was characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM), which show the loose surface state of Gd 2 O 3 /Fe 2 O 3 microspheres. Finally, the property of the gas-sensing sensor based on Gd 2 O 3 /Fe 2 O 3 loose microspheres was investigated systematically. It exhibits ultrahigh sensitivity of 268.6 to 100 ppm acetone at low operating temperature 220 °C, which is 9.8 times higher than the pure Fe 2 O 3 microspheres sensor (27.5/100 ppm). Remarkably, the response of Gd 2 O 3 /Fe 2 O 3 loose microspheres sensor to 0.1 ppm acetone is 2.3. Furthermore, the sensor shows fast response and recovery time (6/36 s) and splendid selectivity to acetone.
研究领域:
材料科学
·
传感技术
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 38
·期 7
·2911-2916
·
IF 3.159
Er-tao Liu,Huiping Zhao,Hui Li,Guangfang Li,Yunling Liu,Rong Chen
Porous α-Fe2O3 nanostructures with different morphologies, such as rod-like, sphere-like and cube-like nanostructures, were successfully synthesized via a facile hydrothermal method. The obtained products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and nitrogen adsorption. It was found that iron precursors played a crucial role in the formation of porous α-Fe2O3 nanostructures. The porous α-Fe2O3 nanorods possessed largest BET surface area and ideal pore distribution, as well as exhibited excellent Cr(VI) removal capacity and a fast adsorption rate in a wide pH range. Moreover, porous α-Fe2O3 nanorods also showed excellent adsorptive ability for organic dyes.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jianshan Yang,Yongjin Zou,Sanxia Zhang,Zongliang Yu
Transition metal oxides are widely used as electrode materials for supercapacitors due to their high capacitance and stability. Composite materials comprising two transition metal oxides may exhibit enhanced performance based on the properties of each material. In this study, a two-step hydrothermal method was used to fabricate CoMn 2 O 4 needle clusters loaded with Fe 2 O 3 structures. CoMn 2 O 4 serves as an excellent bimetallic oxide electrode material for supercapacitors and acts as a scaffold for loading Fe 2 O 3 particles, thereby further improving electrochemical performance. CoMn 2 O 4 @Fe 2 O 3 exhibited a high specific capacitance of 760 F g −1 at 1 A g −1 . The CoMn 2 O 4 @Fe 2 O 3 //GO asymmetric supercapacitor achieved a high energy density of 21.3 Wh kg −1 at 4021 W kg −1 and 36.3 Wh kg −1 at 803.4 W kg −1 , with a capacitance retention of 83 % after 10,000 cycles.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Hui Mei,Shixiang Zhou,Mingyang Lu,Yong Zhao,Laifei Cheng
For real-time environmental monitoring and gas detection under harsh conditions, gas sensors with high reliability, sensitivity, and selectivity are in increasing demand. Therefore, pine-branch-like α-Fe 2 O 3 /TiO 2 with a core–shell hierarchical heterojunction structure was designed and fabricated for ethanol sensing. The heterojunction increased the O adsorption, resulting in the formation of more chemisorbed O species for reaction with the target gas. Moreover, the pine-branch-like morphology formed three-dimensional hollow holes as channels for molecule diffusion and adsorption. Compared with gas-proof structures, the hollow regions can realize gas diffusion in the inner and outer surfaces of materials simultaneously. Further, in contrast to aggregated structures, the fibers were separated from each other, and charge conduction between the fibers needed to pass through the surface sensing layer at the fiber boundary; thus, the overall resistance change of the sensors was significantly affected by the response of the heterojunction to the target gas. Consequently, the α-Fe 2 O 3 /TiO 2 sensor exhibited a high response value of 40.4 toward 500 ppm ethanol gas and had excellent selectivity to ethanol. The proposed strategy may facilitate the design and construction of effective heterojunctions and nanostructures for gas sensing.
研究领域:
材料科学
·
传感器技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2015
·
IF 3.501
Chunde Jin,Qiufang Yao,Jingpeng Li,Bitao Fan,Qingfeng Sun
Magnetic γ-Fe 2 O 3 nanoparticles were successfully deposited on the surface of the bamboo via a coprecipitation process at room temperature. Spherical-like magnetic γ-Fe 2 O 3 nanoparticles with a diameter of about 17 nm displayed well superparamagnetic behavior and were chemically bonded to the bamboo surface through the combination of hydrogen groups. With further modification by 1H,1H,2H,2H-perfluorodecyltri ethoxysilane (FAS-17), magnetic γ-Fe 2 O 3 /bamboo composites (MBCs) expressed superhydrophobic performances to not only water but also common liquids like coffee, milk, ink, tea, and coke. When immersed into the corrosive solutions including strong acid (pH = 1), heavy alkaline (pH = 14), and salt with high concentration (5 M) for 24 h, superhydrophobic magnetic γ-Fe 2 O 3 /bamboo composites (SMBC) still remained magnetism as well as superhydrophobicity. Also, under harsh conditions like boiled at 100 °C for 4 h, frozen at − 40 °C for 24 h, SMBCs were kept a robust magnetism and superhydrophobicity. Additionally, SMBC was a typical ferromagnet and exhibited some microwave absorbabilities .
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Haiying Wang,Yingjie He,Liyuan Chai,Huang Lei,Weichun Yang,Lanjing Hou,Tao Yuan,Linfeng Jin,Chong-Jian Tang,Jian Luo
Capacitive deionization (CDI) is increasingly being considered as an effective solution for treating heavy-metal contaminated water. Surface modification of electrode materials with metal oxides is the key to yield high specific capacitance of transition metal oxides for enhancing the efficiency of CDI processes. In this study, we proposed a simple and effective strategy to produce a new, well-ordered Fe 2 O 3 @C composite for Pb 2+ removal via CDI technology. Through controlling hydrofluoric acid-inducing solvothermal carbonization , Fe 2 O 3 dots were highly dispersed in carbonized substrates without using traditional high-temperature calcination . The products possessed regular octahedral morphology with a uniform distribution of α-Fe 2 O 3 in nearly quantum scale (∼20 nm) throughout the carbon matrixes. Compared with other similar materials, the well-dispersed Fe 2 O 3 in carbon matrixes significantly increased the surface areas (∼1832 m 2 g −1 ) and specific capacitance (115.6 F g −1 ) of Fe 2 O 3 @C composites. Using the composites as electrodes, the Pb 2+ adsorption capacity reached 830.17 mg g −1 , which is 28% higher than reported materials. Furthermore, the composites electrode possess a high regeneration efficiency, after 10 cycles, 90.3% of the initial performance is still retained. Our study demonstrated great potential of the novel Fe 2 O 3 @C composites for the removal of heavy metal ions using CDI processes.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2018
·Vol. 10
·期 20
·4530-4535
·
IF 4.674
Xiaojiao Xiang,Zao Wang,Xifeng Shi,Meikun Fan,Xuping Sun
Graphical Iron rods : here, Fe 2 O 3 nanorods are reported as an efficient non-noble-metal electrocatalyst for the nitrogen reduction reaction under ambient conditions. The nanorods efficiently catalyze N 2 to NH 3 in 0.1 M Na 2 SO 4 , achieving a Faradaic efficiency of 0.94 % with a NH 3 yield of 15.9 μg h −1 mg −1 cat. at a potential of −0.8 V vs. reversible hydrogen electrode. The conventional Haber-Bosch process for industrial ammonia production from N 2 and H 2 is not only energy-intensive but also releases a large amount of CO 2 . The electrocatalytic nitrogen reduction reaction (NRR) is regarded as a sustainable and environmentally-benign alternative approach for NH 3 production under ambient conditions. In this communication, it is reported that Fe 2 O 3 nanorods act as an efficient electrocatalyst for the NRR. In 0.1 M Na 2 SO 4 , it attains a Faradic efficiency of 0.94 % and NH 3 yield of 15.9 μg h −1 mg −1 cat. at −0.8 V vs. reversible hydrogen electrode. Furthermore, this catalyst also shows good stability during electrolysis and recycling tests.
研究领域:
化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 17
·5859-5867
·
IF 6.119
Yiqing Wei,Huichao He,Chang Liu,Liuqing Yang,Xiaoyong Wang,Aidong Li,Yujie Xiong,Qing Shen,Yong Zhou,Zhigang Zou
The photoelectrochemical (PEC) water oxidation performance of α-Fe2O3 photoanodes is jointly restricted by their high charge recombination and sluggish water oxidation kinetics. Herein, through coupling Ag and CdS nanoparticles with an α-Fe2O3 nanorod film, a new kind of α-Fe2O3/Ag/CdS ternary heterojunction film was constructed and investigated as a photoanode for solar water oxidation. The resultant α-Fe2O3/Ag/CdS photoanode can take full advantages of the α-Fe2O3/CdS heterojunction and the properties of Ag nanoparticles. Specifically, the formation of the α-Fe2O3/CdS heterojunction improves the charge separation and transfer efficiency of the α-Fe2O3 photoanode through band potential differences. Meanwhile, the presence of Ag nanoparticles enlarges the absorption edge of α-Fe2O3/CdS and decreases the electron–hole recombination through their surface plasmon resonance (SPR) effect. In addition, the electrocatalytic properties of Ag nanoparticles could initiate the water oxidation on the α-Fe2O3/Ag/CdS photoanode jointly. As a result, a higher photocurrent density of 3.25 mA cm−2 at 1.23 V vs. RHE was achieved on the α-Fe2O3/Ag/CdS photoanode during water oxidation, which is 2.5 times higher relative to the photocurrent of the α-Fe2O3 photoanode. Furthermore, the onset potential of water oxidation on the α-Fe2O3/Ag/CdS photoanode was negatively shifted about 220 mV relative to the α-Fe2O3 photoanode due to its faster kinetics. With the protection of the amorphous TiO2 layer, the water oxidation activity of the α-Fe2O3/Ag/CdS photoanode can be steadily maintained even after 10 h of reaction at 1.23 V vs. RHE. The present work provides an efficient strategy for the development of α-Fe2O3-based ternary heterojunction photoanodes for solar water oxidation.
研究领域:
材料科学
·
能源科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
Chemosensors
·
2023
·Vol. 11
·期 4
·250
·
IF 4.2
Liang Wang,Jianxin Yi
Monitoring the concentration of hydrogen is very important as it is a flammable and explosive gas. Non-Nernstian potentiometric hydrogen sensors hold promising potentials for the sensitive detection of hydrogen. This paper reports the improved H2-sensing performance of a mixed oxide ion-electron conducting (MIEC) Pr0.1Ce0.9O2−δ(PCO) electrode using Fe2O3surface modification. The Fe2O3-modified PCO exhibited a high response of −184.29 mV to 1000 ppm H2at 450 °C. The response values exhibited a linear or logarithmic dependence on the H2concentration for below or above 20 ppm, respectively. A sensitivity of −74.9 mV/decade in the concentration range of 20–1000 ppm was achieved, and the theoretical limit of detection was calculated to be 343 ppb. Moreover, a power-law relationship between the response time and the concentration value was also found. Electrochemical impedance analyses revealed that the excellent H2-sensing performance may be attributed to the large ratio of the electrochemical activity of the hydrogen oxidation reaction (HOR) over the oxygen exchange reaction (OER). In addition, the distribution of relaxation time (DRT) results reveal that the enhanced electrochemical kinetics caused by H2presence in air is mainly related to acceleration of the electrode surface processes.Keywords:solid electrolyte;potentiometric gas sensor;Fe2O3surface modification;electrochemical activity
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
LIQUID CRYSTALS
·
2021
·
IF 0
Xiangshen Meng,Jian Li,Yueqiang Lin,Xiaodong Liu,Ningning Liu,Wenjiang Ye,Decai Li,Zhenghong He
The polymer dispersed liquid crystal films doped with the low concentration γ-Fe2O3 nanoparticles coated with oleic acid were inverstigatited. The experimental results showed that the doped and un-doped polymer dispersed liquid crystal films were the similar surface morphologies, however their evolving curves of the capacitance with the applied voltage were different, as well as the transmission rate. The interpretations based on these differences were proposed, i.e. those came from the adsorbed free ions by the γ-Fe2O3 nanoparticles, instead of the electromagnetic properties of the γ-Fe2O3 nanoparticles. The effect of the free ions is equivalent to the negative dielectric constant and refractive index. Furthermore, the reduction of the free ion concentration due to the absorption in the doped polymer dispersed liquid crystal films can decrease the negative dielectric constant and refractive index, i.e. the effective dielectric constant and refractive index were increased. As a result, the contrast ratio increased significantly, and the driving and threshold voltages decreased distinctly. These results may be useful for electro-optics devices.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
COMPOSITES COMMUNICATIONS
·
2025
·
IF 7.7
Huaxu Song,Zhenlu Li,Yean Li,Jingying Hou,Jinya Sun,Yishun Xie,Xiaohui Zhang,Xin Fan
The enhancement of electrochemical performance in supercapacitors is significantly dependent on the development of electrode materials characterized by optimized morphology and size. Fe 2 O 3 is a promising material among various candidates, but its practical applications are hindered by internet challenges such as poor conductivity. In this study, Fe-MOF was employed as a precursor template for synthesizing Fe 2 O 3 , and polyvinylpyrrolidone (PVP) was introduced to regulate crystal growth. This approach led to the successful synthesis of Fe 2 O 3 particles with three distinct morphologies. The MFO-2 material, characterized by a large surface area, exhibited an impressive specific capacitance of 96.8 mAh g -1 at a current density of 1 A g -1 . To further explore its practical application, an asymmetric supercapacitor was assembled with MFO-2 as the negative electrode and super-activated carbon (AC) as the positive electrode. The resulting AC//MFO-2 supercapacitor demonstrated a maximum energy density of 20.12 Wh kg -1 at a power density of 140 W kg -1 . It retained 90.5% of its capacity after 10000 charge-discharge cycles at 2 A g -1 , confirming its excellent cycling stability. Additionally, the two devices were connected in parallel and successfully powered an LED light, providing strong evidence for the practical applicability of the proposed system.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2025
·Vol. 13
·期 14
·2403424
·
IF 7.2
Yu Wang,Qichao Xue,Jincheng Zhang,Yuying Wang,Hang Ma,Fang Zhong,Ning Zhou,Chenying Yang,Yuchuan Shao,Tao Liang
Inspired by the human visual system, artificial optoelectronic synaptic devices are capable of performing perception, recognition, and memory tasks in a highly efficient and parallel way. Among the materials explored for constructing these devices, 2D transition metal oxides (TMOs) stand out due to their tunable compositions, exceptional stability, and unique optoelectronic properties. However, challenges such as complex device architectures, compromised material quality, and high energy consumption persist. Herein, the successful growth of 2D nonlayered α-Fe 2 O 3 nanoflakes is reported via a molecular sieve-assisted chemical vapor deposition (CVD) method. These nanoflakes, with a minimum thickness of two unit cells, exhibit high crystallinity, n-type charge carrier transport properties, and response to 450 nm laser illumination. Notably, the charge trapping/de-trapping at oxygen vacancies (V O ) and the light-induced ionization of V O contribute to the distinct electron concentration and current hysteresis during cyclic voltage sweeps in the thin α-Fe 2 O 3 nanoflakes. This mechanism results in a significantly prolonged photocurrent decay, enabling the emulation of biological synaptic behaviors such as excitatory postsynaptic current (EPSC), paired-pulse facilitation (PPF), short-term potentiation (STP), and long-term potentiation (LTP). Combined with the scalability of the CVD process, this work highlights the potential of 2D α-Fe 2 O 3 for applications in integrated artificial vision systems.
研究领域:
材料科学
·
神经形态计算
·
光电材料
✓ 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）