Materials Today Chemistry
·
2025
·
IF 6.7
Shouyu Lu,Lei Sun,Shun Liu,Ping He,Jiang Wu,Mei Ma,Yang Ling,Hong Yao,Guangqian Luo,Dapeng Wang
A Fe 2 O 3 /CaSiO 3 composite adsorbent was synthesized using calcium nitrate as a precursor for the adsorption and removal of As 2 O 3 from high-temperature flue gas at temperatures ranging from 1073 K to 1273 K. A combination of experimental investigations and theoretical calculations was employed to analyze the impact of Fe-doped calcium silicate on its arsenic adsorption performance, as well as to elucidate the adsorption mechanism of the Fe 2 O 3 /CaSiO 3 composite material for As 2 O 3 . The experimental results demonstrated that the incorporation of Fe 2 O 3 resulted in an enhanced pore structure within the material. When the molar ratio of Fe:Si was set at 1:5, the Fe 2 O 3 /CaSiO 3 adsorbent exhibited optimal As 2 O 3 adsorption capacity at 1273 K, achieving a remarkable value of 996.0 mg/kg—significantly higher than that observed with pure calcium silicate. During the adsorption process, the doped iron oxide released additional free electrons, thereby facilitating the conversion of lattice oxygen into chemisorbed oxygen. Furthermore, density functional theory (DFT) calculations were utilized to further investigate the microscopic mechanisms underlying the behavior of the Fe 2 O 3 /CaSiO 3 composite adsorbent. The findings indicated that Fe sites within Fe 2 O 3 /CaSiO 3 served as primary active sites and electron transport channels for this material, promoting both separation and conversion processes involving lattice oxygen. During arsenic adsorption, significant orbital hybridization occurred between Fe atoms and O atoms in As 2 O 3 , which contributed to enhancing stability within the chemisorption system. Overall, Fe 2 O 3 /CaSiO 3 displayed exceptional performance in terms of arsenic adsorption capabilities along with notable anti-sintering properties, positioning it as a promising composite material for effective arsenic removal under high-temperature conditions.
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
ChemSusChem
·
2018
·Vol. 11
·期 13
·2156-2164
·
IF 7.411
Feng Li,Jing Li,Jie Zhang,Lili Gao,Xuefeng Long,Yiping Hu,Shuwen Li,Jun Jin,Jiantai Ma
Graphical Dope to promote : A high-performance photoanode consisting of NiO nanoparticles anchored on a gradient P-doped α-Fe 2 O 3 nanorod array (NiO/P-α-Fe 2 O 3 ) is successfully fabricated. The electrochemical results show that the photoanode presents a high photocurrent density and long-term stability for improved water oxidation. The photoelectrochemical (PEC) water-splitting efficiency of a hematite-based photoanode is still far from the theoretical value due to its poor surface reaction kinetics and high density of surface trapping states. To solve these drawbacks, a photoanode consisting of NiO nanoparticles anchored on a gradient phosphorus-doped α-Fe 2 O 3 nanorod (NR) array (NiO/P-α-Fe 2 O 3 ) was fabricated to achieve optimal light absorption and charge separation, as well as rapid surface reaction kinetics. Specifically, a photoanode with the NR array structure allowed a high mass-transport rate to be achieved, while phosphorus doping effectively decreased the number of surface trapping sites and improved the electrical conductivity of α-Fe 2 O 3 . Furthermore, the p–n junction that forms between NiO and P-α-Fe 2 O 3 can further improve the PEC performance due to efficient hole extraction and the water oxidization catalytic activity of NiO. Consequently, the NiO/P-α-Fe 2 O 3 NR photoanode produced a high photocurrent density of 2.08 mA cm −2 at 1.23 V versus a reversible hydrogen electrode and a 110 mV cathodic shift of the onset potential. This rational design of structure offers a new perspective in exploring high-performance PEC photoanodes.
研究领域:
材料科学
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能源研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Guijuan Wei,Xixia Zhao,Kun Du,Yiwen Huang,Changhua An,Shujun Qiu,Miao Liu,Shuang Yao,Yue Wu
Flexible asymmetric supercapacitors (FASCs) have attracted increasing interest in portable and wearable electronics. The practical application of FASCs in high energy density devices is limited by their low specific capacity, which can be effectively addressed by designing electrode materials hierarchically on the micro-nanoscale. Herein, well-defined 3D porous hierarchical CuCo 2 O 4 @carbon quantum dots (CQDs) and Fe 2 O 3 @CQDs architectures are rationally synthesized through a simple CQDs-induced hydrothermal self-assembly technique. Both of the as-prepared CuCo 2 O 4 @CQDs and Fe 2 O 3 @CQDs electrodes exhibit improved specific capacity, desirable rate capability and complementary potential range. A FASC (CuCo 2 O 4 @CQDs//Fe 2 O 3 @CQDs) on graphite paper delivers a high operation voltage of 1.55 V, an energy density of 39.5 Wh kg −1 at 1203.7 W kg −1 , and long cycling lifespan. The excellent performance is ascribed to the good electronic conductivity with the assistance of CQDs and their unique 3D mesoporous structures with extraordinary specific surface area, which could provide fruitful active sites for electrochemical reactions . The newly developed FASC based on the Faradaic-type electrodes is inspiring, and would be promising for the applications in wearable electronic devices.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Yanfei Li,Yuanyuan Fu,Shouhui Chen,Zhenzhong Huang,Li Wang,Yonghai Song
A rapid and simple way to prepare porous Fe 2 O 3 /Fe 3 O 4 @carbon octahedron arrayed on three-dimensional graphene foam (Fe 2 O 3 /Fe 3 O 4 @C/G) nanocomposites was developed. Firstly, Fe-metal organic frameworks (MOFs)/graphene oxide (GO) precursor was fabricated by growing octahedral Fe-MOFs on the surface of GO and then the as-prepared Fe-MOFs/GO was rapidly transformed into porous Fe 2 O 3 /Fe 3 O 4 @C/G by combusting the mixture of precursors and triethylamine (TEA) in air. In the combustion process, GO was reduced and connected each other into N-doped G foam, and Fe-MOFs were transformed into porous Fe 2 O 3 /Fe 3 O 4 @C octahedron and arrayed on G foam. The porous structure, porous carbon and G foam relieved the volume expansion of Fe 2 O 3 /Fe 3 O 4 nanoparticles , and enhanced electrical conductivity of nanocomposites. The as-prepared Fe 2 O 3 /Fe 3 O 4 @C/G showed a high discharge capacity (1210 mAh g −1 , 200 cycles) and long cycle life (5 A g −1 , 400 cycles) when was applied to lithium-ion batteries. This work to prepare Fe 2 O 3 /Fe 3 O 4 @C/G nanocomposites through the combustion of TEA and Fe-MOFs/GO could save energy, achieve rapid preparation and shorten the reaction time. It might provide an original way for fabrication of transition metal oxides@C derived from MOFs and a constructive view into the preparation of composite materials.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Yuchuan Feng,Penghui Wang,Nana Wang,Xin Guo,Suxia Ma
Reactive force field molecular dynamics (ReaxFF MD) simulation and experiments were employed to deeply reveal the sintering mechanism of Fe2O3 particles during iron-based chemical looping combustion. The sintering process of Fe2O3 particles was simulated at different temperatures (973–1273 K). The results showed that the temperature increase has limited effect on the structure of Fe2O3 particles and slightly increases the atomic irregularity. The sintering process of Fe2O3 particles can be divided into three stages: the proximity phase, rapid formation, and slow growth of the sintering neck. The temperature increase significantly promotes the sintering process of Fe2O3 particles. The mean-square displacement and Arrhenius equations were used to study the atomic diffusion properties of Fe2O3 particles. The diffusion activation energy of surface atoms is lower than that of inner atoms, implying that the surface atoms have stronger diffusion ability. With the increase of temperature, more Fe atoms diffuse toward the interface of Fe2O3 particles. Increasing the temperature can accelerate the diffusion and enrichment of surface atoms, especially Fe, toward the sintering neck region, resulting in more serious sintering of Fe2O3 particles. ReaxFF MD simulation is in good agreement with the experimental results. Inhibiting the atomic diffusion is the key to improving the antisintering ability of Fe2O3 oxygen carriers.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Yu-pei Li,Fa-tang Li,Xiao-jing Wang,Jun Zhao,Jiang-nan Wei,Ying-juan Hao,Ying Liu
A quantum-sized hematite iron oxide (α-Fe 2 O 3 )/graphitic carbon nitride (g-C 3 N 4 ) hybrids have been designed and constructed through a facile in situ calcination treatment. The α-Fe 2 O 3 /g-C 3 N 4 hybrids were analyzed via various characterization techniques including XRD , TEM , UV–Vis DRS , XPS , and their photocatalytic efficiencies were evaluated by visible light-driven hydrogen evolution . The results reveal that the cooperation of α-Fe 2 O 3 and g-C 3 N 4 during fabrication process leads to synergy effects of not only the morphology but also the microstructure. These hybrids exhibit much higher hydrogen evolution efficiency than pure g-C 3 N 4 under visible-light illumination due to their improved light harvesting capability, enhancement of surface areas , predominant (110) facet exposure of α-Fe 2 O 3 as well as a prominent quantum size effect , and highly efficient electron transfer and separation. A proposed Z-scheme mechanism was further verified experimentally.
研究领域:
材料科学
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光催化
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纳米材料
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能源化学
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半导体物理
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表面科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 46
·23607-23620
·
IF 7.443
Zhifeng Jiang,Deli Jiang,Wei Wei,Zaoxue Yan,Jimin Xie
In this work, we fabricated size-tunable metal (Pd, Ag) nanoparticles grafted on bionic dendritic α-Fe2O3 (M@Fe2O3) through an in situ growth method by using carbon nanodots as a reducing agent followed by a hydrothermal reaction. The size of the supported noble metal nanoparticles can be directly controlled on the surface of dendritic α-Fe2O3 by adjusting the added amount of noble metal salts. The catalytic performances of the resulting M@Fe2O3 hybrid composites were firstly evaluated by reduction of p-nitrophenol. The results indicated that the size of the noble metal nanoparticles had a crucial influence on the catalytic behaviors of the M@Fe2O3. In addition, the dendritic M@Fe2O3 also showed improved photocatalytic efficiencies for visible-light-driven MB degradation due to synergic effects between dendritic α-Fe2O3 and noble metal nanoparticles, including optical properties, unique structure, good dispersion, good charge separation and the SPR effect. The M@Fe2O3 composites have good reproducibility and are highly stable for p-nitrophenol reduction/degradation of MB. Our strategy can be extended to a general strategy for the formation of other novel composites consisting of a 3D hierarchical metal oxide and noble metal nanoparticles with tailorable size (e.g., Pt@TiO2, Pd@MnO2, Au@ZnO and Ag@Cu2O) for broad applications in water treatment.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 7
·期 1
·336-343
·
IF 3.289
Tao Chen,Yuhao Xiong,Yuemei Qin,Haiguan Yang,Peng Zhang,Fanggui Ye
In this study, a novel and low-cost method was developed for synthesizing magnetic porous γ-Fe2O3/C as an adsorbent and catalyst for removal of methylene blue (MB) from aqueous solution. Using FeCl3·6H2O and bagasse as the precursor, the biomass-based material was synthesized rapidly using a microwave heating process. Fe ions were introduced to achieve both adsorption and catalytic degradation by the Fenton reaction. Characterization by BET, XRD, SEM, and TEM indicated that the prepared γ-Fe2O3/C material exhibited homogeneous mesoporosity with a BET surface area, mesoporous volume, and saturation magnetization of 764.116 m2 g−1, 0.54 cm3 g−1, and 17.1 emu g−1, respectively. The material exhibited excellent adsorption and catalytic degradation abilities for removal of MB from aqueous solution (up to 352.96 mg g−1), with complete degradation of MB within 30 min. Moreover, γ-Fe2O3/C had good stability over 5 cycles. Therefore, this biomass-based γ-Fe2O3/C material can be used as a highly effective and low-cost adsorbent and catalyst and has great potential application in clean-up processes for environmental pollutants.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Miaotian Long,Zerui Zhang,Long Yan,Liang Yi
For effectively strengthening the comprehensive properties of intumescent flame-retardant epoxy resins (EPs), a microencapsulating γ-Fe 2 O 3 by polypyrrole (PPy) named PPy-Fe 2 O 3 was synthesized and used as a synergist to simultaneously enhance the flame retardancy, smoke toxicity suppression and mechanical strength of EP composites containing diaminodiphenylmethane modified ammonium polyphosphate (DDP). The results demonstrate that the mixture of PPy-Fe 2 O 3 and DDP exhibits a surprising synergistic effect on strengthening the comprehensive properties of EP composites. Specifically, EP composite containing 0.2 wt% PPy-Fe 2 O 3 and 9.8 wt% DDP achieves the UL94 V-0 rating with a limiting oxygen index (LOI) value of 35.5%, while 10 wt% DDP only imparts a UL94 V-1 rating and a LOI value of 34.0% to EP. Furthermore, 0.2 wt% PPy-Fe 2 O 3 shows a 11.0% reduction in peak smoke production rate and a 12.3% reduction in peak heat release rate of the EP/DDP system. The enhanced fire security of EP/DDP/PPy-Fe 2 O 3 is attributed to the formation of more phosphorus-rich structures retained in the char, thus reducing the release of harmful gases including NH 3 , CO, and CO 2 , and generating more incombustible gases including H 2 O to weaken burning intensity. Meanwhile, the satisfactory compatibility of PPy-Fe 2 O 3 with epoxy matrix imparts a superior mechanical strength to EP composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Hongwei Luo,Yaoyao Zhao,Dongqin He,Qing Ji,Ying Cheng,Daoyong Zhang,Xiangliang Pan
Fe@Fe 2 O 3 core-shell nanowire is a promising heterogeneous Fenton iron catalyst to degrade organic pollutants. So far, the roles of hydroxylamine (HA) in Fe@Fe 2 O 3 /HA system for pollutant degradation still remain unknown. In this study, the HA-facilitated degradation of rhodamine B (RhB) and p-nitrophenol (PNP) by Fe@Fe 2 O 3 was reported and the underlying mechanisms were explored. Results show that addition of HA significantly enhanced degradation of organic pollutants and a higher HA dosage caused a faster degradation rate . The degradation process was completely inhibited by scavengers, indicating the hydroxyl radical (HO ) from bulk solution dominated the reactions. HA in the Fe@Fe 2 O 3 /H 2 O 2 /HA system was highly efficient to promote the generation of HO by accelerating both the Fe 3+ /Fe 2+ cycle and the H 2 O 2 decomposition. Meanwhile, HA itself was rapidly decomposed along with the pollutants degradation. About 50.5% of RhB and 46.4% of PNP were mineralized in the presence of HA. The effective pH value for degradation was expanded from 4.0 to 5.0. The EE/O calculations demonstrate that a higher energy input for PNP was required than that for RhB. This study will shed lights on the reactivity of the Fe@Fe 2 O 3 /HA system and provide an alternative pathway for removal of organic contaminants.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2015
·
IF 4.642
Jun Liu,Shuanglei Yang,Wei Wu,Qingyong Tian,Shuyuan Cui,Zhigao Dai,Feng Ren,Xiangheng Xiao,Changzhong Jiang
The 3D flowerlike α-Fe2O3@TiO2 core–shell nanocrystals with thorhombic, cubic, and discal morphologies are synthesized for photocatalytic application. α-Fe2O3 nanocrystals were prepared via a Cu2+, Zn2+, and Al3+ ion-mediated hydrothermal route. The α-Fe2O3@TiO2 core–shell nanocrystals are obtained via a hydrothermal and annealing process. The shape-dependent photocatalytic activities of these as-obtained α-Fe2O3@TiO2 core–shell nanocrystals are measured. The results reveal that the discal α-Fe2O3@TiO2 nanocrystals exhibit the best photocatalytic activity relative to the other two core–shell nanocrystals because the discal α-Fe2O3 nanocrystals possess more rough surface and surface defects. The fast interfacial charge-transfer process and the wide spectral response could be the driving force for the enhanced photocatalytic performance. These core–shell architectures provide a positive example for synthesis of novel composite nanomaterial.
研究领域:
材料科学
·
纳米技术
·
光催化
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Zhourong Xiao,Fang Hou,Yueting Li,Rongrong Zhang,Guoqiang Shen,Li Wang,Xiangwen Zhang,Qingfa Wang,Guozhu Li
Fe 2 O 3 nanoparticles is confined in the mesoporous shell of N-doped carbon microsphere for oxygen reduction reaction (ORR). A series of hollow catalysts together with corresponding control samples have been constructed, characterized and evaluated. The structure, composition and state of the as-prepared catalysts were characterized by Scanning electron microscope, Transmission electron microscope, X-Ray diffraction, X-Ray photoelectron spectroscopy, Raman and nitrogen adsorption-desorption. The electrochemical activity and selectivity of Fe 2 O 3 -based catalyst toward the 4e − pathway has been greatly improved (E onset of −50 mV, E 1/2 of −150 mV and average electron transfer number of 3.87). The current density is 18.5% higher than that of commercial 20 wt% Pt/C. Density functional theory calculations reveal that the confinement of Fe 2 O 3 nanoparticles in the interlayer of N-doped graphite can significantly promote the activity of N-doped graphitic surface in alkaline media for ORR, due to facilitated O 2 adsorption and reduced energy of OOH formation which is the rate-determining step of ORR. Such a confinement strategy provides a general and effective route to push the limit of transition metal oxides to a higher level for ORR and realize the controllable construction of highly active non-noble-metal catalysts with well-defined mechanism understanding.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）