COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Ruiping Li,Ali Reza Kamali
Ferric oxide (Fe 2 O 3 ) is an attractive candidate for energy storage applications, including anode of Li-ion batteries due to its low-cost, high availability and large theoretical capacity. However, the mineral suffers from poor cyclability and rate performance due to the combination of rapid disintegration of the compound upon Li-ion insertion and extraction cycles, and poor conductivity of the electrode. Here, for the first time, we report on the clean modification of ferric oxide using corn-derived silica and graphite-derived graphene nanosheets , using a facile calcination-mechanical integration approach, without the involvement of environmentally-problematic raw materials. The product (Fe 2 O 3 @Fe 2 SiO 4 @G) consists of ferric oxide particles coated with iron silicate; and these hybrid particles are integrated with graphene nanosheets. The presence of Fe 2 SiO 4 layers could relieve the volume changes of Fe 2 O 3 involved in the cycling, and also improves the ionic conductivity reducing the interfacial resistance between the electrode and the electrolyte, while graphene nanosheets improves the electrical conductivity of the electrode. Thus Fe 2 O 3 @Fe 2 SiO 4 @G electrode considerably outperforms the initial Fe 2 O 3 with outstanding Li-ion storage capacities of 823 and 422 mA h g −1 recorded at the current densities of 100 and 1000 mA g −1 , respectively, after 300 cycles. Pseudocapacitive behavior of the electrode is found to be 76.6% at 1 mV s −1 , confirming the promotion of surface interactions in the nanostructured hybrid material . This article suggests a clean way of modifying naturally occurring Fe 2 O 3 to be used as the anode of lithium ion batteries.
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 40
·405502
·
IF 3.953
Ziqin Zhuang,Li Zhang,Chaozhu Huang,Xiaohang Wang,Haichuan Guo,Tiju Thomas,Fengdong Qu,Pei Wang,Minghui Yang
Surface modification by employing precious metals is one of the most effective ways to improve the gas-sensing performance of metal oxide semiconductors. Pure α-Fe2O3 nanoparticles and Pt-modified α-Fe2O3 nanoparticles were prepared sequentially using a rather simple hydrothermal synthesis and impregnation method. Compared with the original α-Fe2O3 nanomaterials, the Pt-α-Fe2O3 nanocomposite sensor shows a higher response value (Ra/Rg = 58.6) and a shorter response/recovery time (1 s/168 s) to 100 ppm dimethyl disulfide (DMDS) gas at 375 °C. In addition, it has better selectivity to DMDS gas with the value of more than 9 times higher than the other target gases at 375 °C. This study indicates that the Pt-α-Fe2O3 nanoparticle sensor has good prospects and can be used as a low-cost and effective DMDS gas sensor.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Jide Zhang,Jinxia Feng,Yaling Tian,Yiyong Wu,Xia Liu,Quanguo He
An electromical sensor based on α-Fe 2 O 3 @Co 3 O 4 -NRGO composited glass carbon electrode (GCE) was constructed and used for ultrasensitive tyrosine detection. A series of characterization techniques including scanning electron microscopy, X-ray diffraction and electrochemical impedance spectroscopy technique and cyclic voltammetry were employed to investigate the modified electrode. Compared with the bare GCE, the α-Fe 2 O 3 @Co 3 O 4 -NRGO/GCE exhibited a strong current response to tyrosine because of the synergistic effect of ternary composite. Under optimized conditions, the peak currents that responded to tyrosine concentration had a linear relationship from the scope of 0.01 to 10 µM (R 2 = 0.9977) by second derivative linear sweep voltammetry (SDLSV) and 8 nM (S/N = 3) is the detection limit. The sensor showed higher sensitivity, better repeatability, reproducibility and greater sensing stability related advantages over those in previous tyrosine detections. Furthermore, the sensor was successfully applied to trace tyrosine determination in practical samples such as milk and serum.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yingni Yu,Jing Liu,Yingju Yang,Junyan Ding,Aijia Zhang
Iron oxide (Fe 2 O 3 ) has been used as an effective sorbent to remove various heavy metals due to its large adsorption capacity and low cost. The cadmium capture capability of Fe 2 O 3 sorbent was investigated in the simulated flue gas at the temperatures of 700–1100 °C. Fe 2 O 3 sorbent exhibited much better Cd adsorption capability than SiO 2 and Al 2 O 3 sorbents. The largest Cd adsorption capacity of Fe 2 O 3 sorbent was 86.7 mg/g at 700 °C. The XPS analysis demonstrated that Fe 3+ might partially participate in the cadmium adsorption process. A large quantity of CdO was generated and adsorbed on the Fe 2 O 3 surface. The density functional theory (DFT) calculations were used to determine the active sites and the involved mechanism of different cadmium species adsorption over Fe 2 O 3 sorbent. Cd, CdCl 2 , and CdO can be stably adsorbed on the Fe 2 O 3 surface with the adsorption energies of −40.64 kJ/mol, −237.42 kJ/mol, and −375.03 kJ/mol, respectively. The results illustrate that the Fe atoms are the essential active sites for cadmium species adsorption on Fe 2 O 3 surface. The orbital hybridization between cadmium atom and Fe site suggests that the strong interaction occurs during Cd adsorption process. Both physisorption and chemisorption mechanisms were responsible for the cadmium capture by Fe 2 O 3 sorbent.
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 1
·82
·
IF 4.146
Chuang Li,Dan Wang,Jiangli Gu,Yichun Liu,Xintong Zhang
Surface electron traps on semiconductor photoanodes mediate surface recombination and deteriorate the photoelectrochemical (PEC) water oxidation performance of the photoanode. Developing convenient methods to reduce surface electron traps is therefore essential for high efficiency PEC water oxidation on semiconductor photoanodes, particularly for nanostructured photoanodes with large surface area. Herein, we employ a O2plasma treatment to boost the PEC water oxidation performance of Ti-doped Fe2O3(Ti-Fe2O3) nanowires photoanodes, aiming to reduce surface oxygen vacancies, the dominant electron traps on Ti-Fe2O3surface. X-ray diffraction (XRD), scanning electron microscopy and spectroscopic analyses show that the oxygen plasma treatment changes the structural, morphological and optical properties negligibly, but it does reduce the content of surface oxygen vacancies, as estimated from O1s X-ray photoelectron spectroscopy spectra. An optimal O2plasma treatment (200 W, 70 s) increases the photocurrent density of the Ti-Fe2O3nanowire photoanode to 2.14 mA·cm−2(1.23 V vs. RHE) under air mass 1.5G simulated solar light, which is 1.95 times higher than the pristine Ti-Fe2O3nanowire photoanode. The surface hole transfer efficiency is also improved by 1.66 times due to the reduced surface recombination. The work suggests that O2plasma treatment is a convenient but effective method to boost the PEC water oxidation performance of Ti-Fe2O3photoanode and might be applicable to other semiconducting oxide photoanodes for high efficiency PEC water splitting.Keywords:photoelectrochemical water splitting;O2plasma treatment;surface oxygen vacancies;Ti-doped hematite nanowire arrays
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Qilu Cheng,Hui Jiang,Zhuo Jin,Ying Jiang,Cai Hui,Ligen Xu,Yuhua Zhao,Linna Du
In this study, the impact of Fe 2 O 3 nanoparticles (nFe 2 O 3 ) on microbial extracellular polymeric substances (EPS) and nonylphenol (NP) degradation in sediment were investigated. The results showed that the addition of nFe 2 O 3 lowered the degree of EPS overproduction and the amount of polysaccharides and proteins secreted in NP contaminated sediment. Particularly, the secretion of colloidal EPS (C-EPS) lowered significantly ( P < 0.05), and the content of tyrosine-like, tryptophan-like, and soluble microbial by-product-like substances in C-EPS also decreased, leading to a lower aromaticity, humification, and hydrophobicity of C-EPS. Furthermore, with lower C-EPS content in water, NP was adsorbed to sediment more easily, and the weakened toxic effect of NP to bacteria as well as a higher proportion of organic matter degrading microbes stimulated NP degradation. These findings revealed the vital role of nFe 2 O 3 in alleviating NP toxicity to microbes and reducing NP ecological risk in aquatic environments.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Arabian Journal of Chemistry
·
2020
·
IF 4.762
Kechen Song,Shuo Wang,Qiang Sun,Deping Xu
Nano-sheets Al 2 O 3 supported CeO 2 -Fe 2 O 3 binary oxides were prepared by the vacuum impregnation method. The structural and textural properties were characterized by pertinent techniques, and the materials were evaluated as catalysts for the oxidative dehydrogenation of ethylbenzene with carbon dioxide (CO 2 -ODEB). The characterization results show that all samples maintain the hierarchical structure, and CeO 2 -like and Fe 2 O 3 -like solid solutions were formed when changing the Ce-to-Fe molar ratio. The catalytic performances indicate that CeO 2 -Fe 2 O 3 binary oxides were effective for CO 2 -ODEB, and the activity is determined by mobile oxygen, which can facilitate the dehydrogenation process. The DFT studies further identified the reaction pathway and rate-determining step. The inter-transmission of oxygen species and the presence of CO 2 refill the oxygen vacancies and restore the redox cycle of CeO 2 -Fe 2 O 3 binary oxides.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zhen Xiang,Baiwen Deng,Chuang Huang,Zhicheng Liu,Yiming Song,Wei Lu
High-performance electromagnetic wave (EMW) absorbing materials have been widely used in the wireless communication and electronic devices due to their important potentials in electromagnetic attenuation. However, it is difficult to develop carbon-based absorbers with thin thickness, lightweight, and low filler loading. In this work, rationally designed hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites were successfully realized for ultrathin, lightweight, and high-efficiency EMW absorbers. It showed that the composition, microstructure, and morphology of composites were tailored, which gave rise to the tunable magnetic behavior, porosity, and electromagnetic parameters. The rational design of composition and novel structure contributed to the optimization of the impedance match. The EMW attenuation was enhanced by the synergistic effects of the dielectric loss originated from the interfacial and dipole polarization, conductive loss stemmed from the 3D conductive network, and the magnetic loss derived from the eddy-current loss and ferromagnetic resonance. Accordingly, the hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites with a low filling ratio of 20 wt% achieved an ultrathin matching thickness of 1.4 mm and a strong reflection loss of −63.6 dB. The substantially enhanced EMW absorbing performances were owing to the optimized impedance matching and enhanced attenuation capability. Therefore, this work can provide a paradigm for the design and synthesis of hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites with an enhanced EMW absorption.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 19
·9704-9713
·
IF 5.968
Gang Liu,Quan Deng,Hongqiang Wang,Dickon H. L. Ng,Mingguang Kong,Weiping Cai,Guozhong Wang
Micro/nanostructured α-Fe2O3 spheres (MNFSs) were fabricated via a surfactant- and template-free method, involving the hydrothermal synthesis of FeCO3 precursor firstly and a subsequent thermal decomposition treatment. The product was characterized by X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy. The MNFSs had an average diameter of about 5 μm, and each contained subunits of interlinked and elongated particles with size less than 30 nm. The UV-Vis spectrum of MNFSs exhibited visible-light absorption. The visible-light photocatalytic activity of MNFSs was evaluated by using them to degrade the rhodamine 6G pollutant in water at ambient temperature under different parameters such as pH value, the amount of MNFSs and H2O2. We also found that the visible-light photocatalytic activity of MNFSs was higher than that of the micron- and nano-sized α-Fe2O3 particles. The reaction rate of MNFSs was more than twice that of nano-sized α-Fe2O3 and nearly 12 times faster than that of the micron-sized α-Fe2O3. This high photocatalytic feature of MNFSs was attributed to the high specific surface area together with their special porous structure. Importantly, these characteristics could control the rate of releasing ·OH and thus improve the utilization efficiency of ·OH. MNFSs can be easily recycled from the treated water using a magnet due to its magnetic behavior. There was no obvious decrease of the photocatalytic activity of MNFSs after being used.
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2024
·Vol. 12
·期 8
·1765
·
IF 2.8
Ping Lu,Zihan Zhang,Zixing Gu,Zhuo Li,Huaneng Su,Xiaozhong Shen,Qian Xu
To address the problem of suboptimal performance in deep eutectic solvents displayed by traditional TiO2photoelectrodes and Cu2O photoelectrodes that have undergone simplistic modifications that result in a mismatch with battery discharge capacity, a method combining hydrothermal and dip-coating techniques was developed to create a Fe2O3-CuO heterojunction structure on the FTO surface. Then, the impact of the heterojunction structure on the performance of solar flow batteries was investigate in this study. The experimental findings reveal that the formation of the heterojunction structure effectively mitigates the recombination rate of photogenerated carriers within the photoelectrode. Furthermore, by meticulously adjusting the CuO loading, the harmonious balance between charging and discharging currents was achieved, thereby enhancing the overall performance of the solar redox flow batteries. In comparison to standalone Fe2O3photoelectrodes, this innovative approach significantly broadens the spectrum of sunlight utilization. Notably, the fabricated Fe2O3/CuO-2 photoelectrode demonstrates a remarkable photocharging performance, far surpassing both Fe2O3photoelectrodes and commercial TiO2photoelectrodes. Specifically, the Fe2O3/CuO-2 photoelectrode boosts an average current density of 598.68 μA∙cm−2, with its charging current density being 2.74 and 5.15 larger, respectively, than that of the Fe2O3and commercial TiO2photoelectrodes.
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2017
·Vol. 10
·期 13
·2796-2804
·
IF 7.226
Dong-Dong Qin,Cai-Hua He,Yang Li,Antonio C. Trammel,Jing Gu,Jing Chen,Yong Yan,Duo-Liang Shan,Qiu-Hong Wang,Jing-Jing Quan,Chun-Lan Tao,Xiao-Quan Lu
Graphical A passive catalyst? A Fe 2 O 3 shell was grown onto a ZnO core to protect the surface from corrosion and increase the charge-separation efficiency. PH 3 treatment onto the core–shell nanowire creates a Fe 2 PO 5 with dual functionality: a catalyst and passivating overlayer. Zinc oxide is regarded as a promising candidate for application in photoelectrochemical water oxidation due to its higher electron mobility. However, its instability under alkaline conditions limits its application in a practical setting. Herein, we demonstrate an easily achieved wet-chemical route to chemically stabilize ZnO nanowires (NWs) by protecting them with a thin layer Fe 2 O 3 shell. This shell, in which the thickness can be tuned by varying reaction times, forms an intact interface with ZnO NWs, thus protecting ZnO from corrosion in a basic solution. The reverse energetic heterojunction nanowires are subsequently activated by introducing an amorphous iron phosphate, which substantially suppressed surface recombination as a passivation layer and improved photoelectrochemical performance as a potential catalyst. Compared with pure ZnO NWs (0.4 mA cm −2 ), a maximal photocurrent of 1.0 mA cm −2 is achieved with ZnO/Fe 2 O 3 core–shell NWs and 2.3 mA cm −2 was achieved for the PH 3 -treated NWs at 1.23 V versus RHE. The PH 3 low-temperature treatment creates a dual function, passivation and catalyst layer (Fe 2 PO 5 ), examined by X-ray photoelectron spectroscopy, TEM, photoelectrochemical characterization, and impedance measurements. Such a nano-composition design offers great promise to improve the overall performance of the photoanode material.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2016
·Vol. 80
·期 3
·719-727
·
IF 1.473
Sun Shanfu,Sun Mingxuan,Kong Yuanyuan,Fang Yalin,Yao Yuan
Abstract There has been considerable progress in the field of semiconductor photocatalysis; nevertheless, developing low-cost and high-activity photocatalysts are still a challenge at the present. Here, a series of graphene/MoS 2 /Fe 2 O 3 ternary composites (MG/Fe 2 O 3 ) were prepared via a two-step simple hydrothermal process using H 2 MoO 4 , CH 4 N 2 S, graphene oxide, and Fe(NO 3 ) 3 ·9H 2 O as the starting materials, respectively. Various techniques such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, photoluminescence spectra, and UV–Vis diffuse reflectance spectroscopy were adopted to characterize the as-prepared samples. The results suggested that MoS 2 /graphene hybrids were successfully composited with Fe 2 O 3 . A redshift of absorption edge in the light region and more absorption in the visible light region were confirmed for the prepared ternary composites. The highest photocatalytic activity of MG/Fe 2 O 3 composites (3.01 × 10 −3 min −1 ) was observed, which was 1.5 times higher than that of pure Fe 2 O 3 (1.97 × 10 −3 min −1 ). The effect of ultrasound on photocatalytic reactions was investigated, and its photodegradation rate was improved 2.2 times than the photoreactor system without sonication. The results indicated that the positive synergetic effect of the MoS 2 and graphene components in this hybrid cocatalyst, which extended the light response and acted as a charges transfer medium, respectively, is the key to improve photocatalytic performance of Fe 2 O 3 . This research may provide new concepts for the design of high-efficiency photocatalysts and broaden the potential of application of Fe 2 O 3 in photocatalytic fields. Graphical Abstract MoS 2 /graphene/Fe 2 O 3 nanocomposites were successfully fabricated via a simple two-step hydrothermal process and a considerably enhanced activity of visible light-induced photodecomposition of MB was demonstrated.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）