SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2020
·
IF 6.984
Nan Wang,Liangpeng Wu,Juan Li,Jiamei Mo,Quanming Peng,Xinjun Li
A dual Z-scheme fe 2 O 3 @MnO 2 core/shell nanocube supported C 3 N 4 ternary composite is rationally designed and successfully fabricated as a photocatalyst for water splitting. The as-prepared Fe 2 O 3 @MnO 2 /C 3 N 4 ternary composite exhibits an enhanced visible light-induced absorbance capacity and superior photocatalytic activity for direct water splitting than that of pure g-C 3 N 4 . The photocatalytic efficiency is investigated by varying amounts of Fe 2 O 3 @MnO 2 core/shell nanocubes in the ternary composite (10%wt, 20%wt and 30%wt). When the mass fraction of Fe 2 O 3 @MnO 2 is determined to be 20%, the hydrogen evolution rate would achieve the maximum with a value of 124 μmol*h −1 . The improved photocatalytic performance of Fe 2 O 3 @MnO 2 /C 3 N 4 ternary composite can be mainly attributed to improved visible light absorption range and construction of an effective dual Z-scheme interfacial heterojunction with a rapid separation and transfer of electron-hole pairs.
✓ 已验证
产品关联
DOI
高影响因子
VACUUM
·
2020
·
IF 2.906
Shanshan Xiong,XianMeng Lin,Shuai Liu,Shuting Weng,Shuyan Jiang,Yang Jiao,Yanchao Xu,Jianrong Cheng
Transition metal oxide , α-Fe 2 O 3 , has attracted great interest as a kind of potential battery-type electrode material due to its high theoretical specific capacity. However, α-Fe 2 O 3 still suffers from poor conductivity and large volume expansion during charge and discharge process. Herein, for the first time, the oxygen vacancies-modifying α-Fe 2 O 3 are prepared via a novel two-step calcination of MIL-88-Fe (Fe-MOF) template. Note that the incorporation of oxygen vacancies into α-Fe 2 O 3 nano-octahedron will promote faster charge storage kinetics and enables the α-Fe 2 O 3 structure to be retained during the Li-ions. The oxygen vacancies-modifying α-Fe 2 O 3 nano-octahedron exhibits high specific capacity (250.2 mAh g −1 ), and an activated carbon (AC)//α-Fe 2 O 3 hybrid supercapacitor is constructed, delivering a high energy density of 63 W h kg −1 at a power density of 900 W kg −1 . This finding underlines the importance of incorporating oxygen vacancies into battery-type electrode materials for promoting the practical application.
✓ 已验证
产品关联
DOI
高影响因子
Functional Materials Letters
·
2020
·
IF 2
Jianxia Zhang,Li Liu,Xiaonian Tang,Dan Sun,Chunxia Tian,Yang Yang
High porosity α -Fe 2 O 3 has attracted a lot of attention due to its exceptional structure. In this paper, nanoflake assembled hierarchical porous flower-like α -Fe 2 O 3 was prepared by hydrothermal and calcination methods without any additional templates. Scanning electron microscopy (SEM) morphological characterization results show that with the increase of calcination temperature (400 ∘ C, 450 ∘ C, 500 ∘ C, 550 ∘ C, 600 ∘ C), pores appeared. However, the results of nitrogen adsorption show that the specific surface area of the α -Fe 2 O 3 reaches the maximum value (52.19 m 2 /g) when the calcination temperature is 500 ∘ C. The gas sensing performance of flower-like α -Fe 2 O 3 with different calcination temperature is compared, interestingly, with the increase of calcination temperature, the response of the samples increased first and then decreased, and reached the maximum value (44.2–100 parts per million (ppm) acetone) when the calcination temperature was 500 ∘ C. The minimum concentration for acetone was 200 ppb (response value is 2.0). Moreover, calcined at 500 ∘ C, hierarchical porous α -Fe 2 O 3 has a fast response recovery (4/25 s) and low working temperature (210 ∘ C). These excellent gas sensing properties are mainly due to porous structure, large specific surface area, and oxygen vacancies on the surface, which make it a promising material for acetone sensors.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 18
·2000804
·
IF 4.948
Jing Ling,Suqin Gong,Yunsheng Xia
In this study, the eco-friendly fabrication system of the hierarchical monodisperse Fe 2 O 3 supraparticles (SPs) is systematically studied. First, by means of urea as pH modulator, monodisperse Fe 2 O 3 SPs with 7 to 90 nm in diameters can be one-step in situ self-assembled in 100% water solution. Then, the SPs can be reliably fabricated by various carboxyl stabilizers, indicating the versatility of the proposed fabrication system. Third, by means of gallic acid (GA) modification, the corresponding products (denoted as Fe 2 O 3 @GA SPs) can be endowed near-infrared light-absorbing properties and photothermal therapy potentials. Fourth, the Fe 2 O 3 @GA SPs exhibit size-dependent photothermal performances and cellular uptake. In terms of 8 nm sized Fe 2 O 3 @GA SPs, their photothermal conversion efficiency and cellular uptake are 66.63% and 8.4 pg Fe/cell, both of which are higher than that of 25 and 47 nm sized products.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Jiang-Bo Huo,Kiran Gupta,Changyong Lu,Hans Chr. Bruun Hansen,Ming-Lai Fu
Efficient removal of aqueous arsenic is still a great challenge in particular for producing clean drinking water and for waste water treatment. To this end, a novel magnetic porous Fe-La composite, comprising La 2 O 2 CO 3 and Fe 2 O 3 , was fabricated via a self-sacrificing template method based on bimetallic (Fe, La)-MOFs calcined at 550 °C. Batch adsorption results demonstrated that Fe-LaXY (X and Y represent the feeding mole ratio of Fe and La precursors) exhibited a maximum adsorption capacity of As(V) (241, 251 and 410 mg g −1 for Fe-La51, Fe-La21 and Fe-La11, respectively), and they also showed satisfactory adsorption kinetics, which can be ascribed to a strong coordination between La and arsenate species. Coexisting sorbates including carbonate, silicate, sulfate, and humic acid had a slight influence on adsorption performance of arsenate, while phosphate isostructural to arsenate gave severe interference. More importantly, the Fe-La11 could be easily separated from water due to its magnetism (7.0 emu g −1 ), and it also exhibited excellent recyclability (above 80% of removal efficiency at the fifth cycle) as well as stability in terms of release of Fe and La ions (< 0.5 mg L −1 at pH 4.0–10.0). Based on results from X-ray photoelectron spectroscopy (XPS), Powder X-ray diffraction (PXRD) and Raman spectroscopy, it is demonstrated that ligand exchange of surface hydroxyl groups and the formation of inner-sphere surface complexes are main responsible for the As(V) removal mechanism. Combining the magnetic properties, the absorption properties and the recyclability make Fe-LaXY derived from bimetallic MOFs promising sorbents for arsenate removal.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Jiajia Liu,Runna Shi,Xiaoshi Lang,Tan Wang,Tingting Qu,Lan Li,Chuangang Yao,Qinzhi Lai,Kedi Cai
Lithium-oxygen battery (LOB) has attracted wide attention owing to its high specific energy and environmental protection advantages. However, LOB also has many problems, such as the discharge products accumulated around the pore size to block the oxygen diffusion channel. In this work, a Co 3 O 4 @Fe 2 O 3 nanosheet composite catalytic material is designed, which can effectively improve the electron transfer in the catalytic process. Furthermore, due to the electronic interaction between Co 3 O 4 and Fe 2 O 3 in the heterostructure region, the optimal active sites for the adsorption and activation of the reactant molecules can be obtained so as to produce better ORR/OER bifunctional catalytic activity. Besides that, the interface between Co 3 O 4 and Fe 2 O 3 can stimulate more electrons to participate in the redox reaction and promote the reversible formation and decomposition of Li 2 O 2 . When Co 3 O 4 @Fe 2 O 3 nanosheet composite as cathode catalyst, LOB can achieve a high discharge specific capacity of 5585 mAh/g with 141 stable charge and discharge cycles.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Peikun Wu,Xiangkai Kong,Yingrui Feng,Wei Ding,Zhigao Sheng,Qiangchun Liu,Guangbin Ji
To design and develop efficient microwave absorbents via phase engineering is still less studied. The unique properties caused by constructing heterophase structure hold the potential to strengthen absorbing capability toward microwave radiation. Herein, amorphous/crystalline γ-Fe 2 O 3 nanosheets (Fe-H) are carefully fabricated through a controlled annealing process. The matched Fermi levels formed on both sides of the heterophase interface not only provides efficient interfacial polarizations but also facilitates the transport of electrons with less scattering over the whole Fe-H nanosheets. Thereby, both of the conduction loss and dielectric polarization relaxation are promoted, leading to a strengthened attenuation toward electromagnetic wave radiation. The as-synthesized Fe-H sample exhibited a minimum reflection loss of -89.5 dB centered at a thickness of 2.00 mm, associated with an effective absorption bandwidth (reflection loss ≤ -10 dB) reaching 6.45 GHz. All of these behaviors are superior to its pure amorphous absorbent and bare crystalline counterpart. Furthermore, this heterophase engineering strategy is valid when extended to Co and Ni based oxides, suggesting its universality and generality for promoting microwave absorption. Henceforth, this study indicates a favorable potential of the synthesis and application of amorphous/crystalline materials as heterophase microwave absorbents.
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 40
·27606-27617
·
IF 3.3
Haiting Shi,Qingqing Wu,Jinxi Bao,Shuaitong Liang,Yanli Hu,Ruiqi Shao,Shuo Wang,Jie Shi,Zhiwei Xu
Fe2O3 is considered a potential electrode material owing to its high theoretical capacity, low cost, and non-toxic characteristics. However, the significant volume expansion and structural degradation during charging and discharging hinder its application in potassium ion batteries. The electrochemical properties of the electrode material are primarily influenced by the diffusion efficiency of ions and the mechanics of the object. From the construction of a one dimensional structure, a three-dimensional flower-like Fe2O3 with a high specific surface and low-dimensional spherical Fe2O3 were prepared. Considering the convenience and visualization of the research, micron-scale Fe2O3 was prepared, although the larger particle size will lose part of the capacity. Notably, compared with the spherical structure, the specific capacity of the flower structure was increased by about 100%. The von Mises stress distribution on the two structures was simulated by the finite element method, revealing the mechanism of electrode failure induced by volume expansion and confirming the vital role of the multidimensional system in relieving stress concentration and improving electrochemical performance. Furthermore, synchrotron radiation soft X-ray absorption spectrum and X-ray micro-tomography revealed the phase transformation process and reaction mechanism of Fe2O3 in potassium ion batteries. The dimensional structure construction strategy reported here can provide theoretical support for modifying transition metal oxides.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Daming Yang,Guiru Sun,Xinru Wang,Fengyang Li,Ze Gao,Pingli Zhang,Wei Lu,Ming Feng
The photo-assisted lithium-oxygen (Li-O 2 ) cell is widely concerned due to its low overpotential. However, rapid recombination rate of photogenerated electrons and holes remains a fundamental challenge for photo-assisted Li-O 2 cells. Herein, we design an optical and magnetic fields co-assisted Li-O 2 cell based on α-Fe 2 O 3 nanospindles. We employed PL spectrum and I-t curve confirm that under the magnetic field, the photogenerated electrons and holes are driven via the opposite Lorentz forces in photo-assisted Li-O 2 cells, which is beneficial to accelerating the formation and decomposition of Li 2 O 2 . The optical and magnetic fields co-assisted Li-O 2 cell based on α-Fe 2 O 3 nanospindles achieves an ultra-high discharge platform of 3.47 V and a low charge platform of 3.57 V, as well as a surprising energy efficiency of 97.2%. In addition, the optical and magnetic fields co-assisted Li-O 2 cell can stably cycle for over 25 cycles. This study offers a reference for improving the electrochemical kinetics of photo-assisted Li-O 2 cell by introducing magnetic field, which opens up a new avenue for the development of high-performance Li-O 2 cells.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Kezhong Wu,FeiFei Nie,Hui Zhao,Xin Qi,Ping Li,Mingxing Wu
The doped transition metal oxides (TMOs) substitute for the traditional Pt as the counter electrode (CE) catalyst is a unique way to reduce the cost and improve the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs). Herein, four different morphologies and size of Fe 2 O 3 (nanodiscus (ND), nanocubes (NC), nanorings (NR), nanoball (NB)) assisted by multi-walled carbon nanotube (MWCNT) to prepare Fe 2 O 3 @MWCNT composites, and then were further utilized in the encapsulated DSSCs. The obtained different morphologies Fe 2 O 3 @MWCNT composites had been characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and N 2 adsorption-desorption. The significant effects of different morphologies of Fe 2 O 3 on the electrochemical activity of Fe 2 O 3 @MWCNT composites as CEs were confirmed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Tafel polarization experiments. The DSSCs using Fe 2 O 3 @MWCNT composites CEs achieved high PCEs of 6.34 (ND), 6.53(NC), 6.65(NR), and 7.09% (NB) to regenerate traditional I 3 − /I − shuttles by the photocurrent-photovoltage ( J - V ) test, respectively, which is due to the synergistic effect between Fe 2 O 3 and MWCNT to improve electrical conductivity and promote a high number of active catalytic sites, implying a remarkable alternative of Pt-free catalyst that can be applied to the encapsulated DSSCs as CEs.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Lei Su,Yingnan Hua,Fan Yang,Zhi Chen,Zhichun Yang,Xinmiao Liang,Cheng Zhang,Gang Liu,Bing Chen
Iron oxide (Fe2O3) is emerging as a potential anode alternative for lithium-ion batteries (LIBs) due to the merits of high specific capacity, environmental friendliness, and cost-effectiveness. However, trapped by unsatisfactory cycling stability and rate capability, further modification is needed for Fe2O3 to achieve practical requirements. In this study, a Fe2O3-based composite anode (namely Fe2O3@HA-Fe-BPDC) with interlocked structure was designed and synthesized for pursuing enhanced electrochemical properties. Benefiting from the porous structure, abundant active sites, and good tolerance to volume expansion, the as-prepared electrode exhibits significantly boosted rate capability, excellent specific capacity, and satisfactory reversibility. Typically, the Fe2O3@HA-Fe-BPDC anode provided an excellent specific capacity of 708 mAh g–1 at 0.1 A g–1 and remained at a high level of 332 mAh g–1 at 1 A g–1, delivering significantly improved rate performance than Fe2O3. Additionally, outstanding capacity retention (95.4%) was achieved at 1 A g–1 after 600 charge/discharge cycles. The strategy based on the facile coprecipitation for fabricating Fe2O3 and MOF composite electrodes provides a feasible technique to develop a high-performance anode for LIBs.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Congyi Zhao,Yaxu Zhao,Lianqi Wang,Ke Lu,Wei Guo,Xiong Lu,Faming Gao
In this experimental study, a highly sensitive electrochemical acetylcholinesterase (AChE) biosensor for the detection of organophosphorus pesticides (OPs) based on three-dimensional α-Fe 2 O 3 nanoflowers decorated with Au nanoparticles (AuNPs) and carbon nanotube (CNTs) (α-Fe 2 O 3 NFs-AuNPs-CNTs) was developed. With the blooms structure, the α-Fe 2 O 3 NFs not only provided an excellent microenvironment for the loading of AChE, but also increased the contact specific surface area. Meanwhile, AuNPs dispersed uniformly on the α-Fe 2 O 3 nanosheets and CNTs further enhanced the conductivity of the nanocomposites. Under the optimized conditions, the biosensor was made to exhibit favorable linear relationship with the logarithm of the concentration of omethoate from 1 × 10 −13 -1 × 10 −7 M, with the detection limit of 1.9 × 10 −15 M. In addition, the biosensor also possessed good repeatability, stability and practicality, proved to be a valuable tool for the detection of pesticides in environment.
✓ 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）