CHEMISTRY OF MATERIALS
·
2025
·
IF 7
Ning Li,Minzhi Dai,Zijing Zhao,Xuan Zhou,Qingduo Wang,Ruihuan Duan,Shuhua Ma,Changjian Li,Yanglong Hou,Xin Luo,Zheng liu,Xiaoxu Zhao
Filling the van der Waals gap by self- or foreign atoms in 2D materials has been proven of great interest because a spectrum of quantum mechanical properties can be tuned. Particularly, Fe-intercalated FexTaS2 crystals show relatively high Curie temperature (TC), air-stable, and giant magnetoresistance. However, the underlying Fe-intercalant concentration- and arrangement-dependent magnetic properties remain elusive, largely impeding the precise design of multifunctional FexTaS2 crystals with desired functionalities. Here, we employ aberration-corrected scanning transmission electron microscopy (STEM) and density functional theory (DFT) to systematically explore the Fe-intercalation arrangement and relative magnetic properties in a series of Fe-intercalated FexTaS2 crystals. We found that the Fe intercalations evolve from 2a × 2a to disorder and then to √3a × √3a arrangements with increasing intercalation concentration, displaying consistent occupancy of the octahedral vacancies. The TC and coercivity (Hc) strongly depend on the Fe-intercalation arrangements and are weakly coupled with the Fe concentrations. DFT calculations suggest that these phenomena originate from the modified spin-polarized states and magnetic anisotropy, being strongly dependent on the Fe-intercalation arrangements. This work sheds light on the origin of arrangement- and concentration-dependent magnetism in foreign-intercalated 2D magnetic systems, paving the way for precise tuning of magnetic orders by controlled foreign intercalation.
研究领域:
凝聚态物理
·
材料科学
·
纳米技术
·
磁性与磁性材料
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高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2026
·
IF 3
Long-Xiang Li,Zhi-Yue Li,Si-Rong Lu,Ting-Yong Chen
Exchange bias (EB) is characterized by a horizontal shift in magnetic hysteresis loops, originating from interfacial coupling between ferromagnetic (FM) and antiferromagnetic (AFM) layers. This phenomenon enables key regulation of magnetic coercivity and spin alignment in spintronic devices. Conventionally engineered in FM/AFM heterostructures. We report exchange bias (EB) in self-flux-grown Fe₁.₁Te single crystals, where Fe excess drives stoichiometric deviation. Structural analysis confirms a tetragonal FeTe phase with no secondary phases, while magnetic measurements reveal coexistence of ferromagnetic (FM) behavior (from excess Fe) and intrinsic antiferromagnetism (AFM) of FeTe. This is evidenced by a zero-field-cooled/field-cooled magnetization bifurcation below the Néel temperature ( T N ≈ 65 K). H EB decays linearly with temperature (vanishing near T N ) and scales with the magnitude of the cooling field. We attribute EB to interfacial coupling between FM clusters (Fe-rich) and the AFM FeTe matrix. This work establishes Fe₁.₁Te as a tunable platform for antiferromagnetic spintronics, leveraging stoichiometric control to engineer interfacial magnetic coupling.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Qing Cheng,Yanzhuo Lv,Deyu Li,Ning Li,Qiao Ding,Yinghai Zhao,Qi Zhao
The Sn-Fe alloy coating is a potential choice for decorative coatings and electronic products because of its excellent performance. However, oxidation of the bath is likely to occur in the process of use, which limits the production of electrodeposition of Sn-Fe alloy. Resveratrol has excellent antioxidant capacity and is considered as a non-polluting natural antioxidant. However, the understanding of using of resveratrol as stabilizer for electroplating solution in the field of electrodeposition is limited. In this study, resveratrol, hydroquinone and TBHQ are selected as the stabilizers of the electroplating bath to conduct comparative experiments for measuring the stability effect of resveratrol. The antioxidant capacities of three stabilizers are compared by means of the natural oxidation experiment, H 2 O 2 accelerated oxidation experiment and electrochemical testing. The natural oxidation experiment and H 2 O 2 accelerated oxidation experiment confirm that the antioxidant effect of resveratrol is higher than hydroquinone and TBHQ. To determine the optimal concentration of resveratrol in the electroplating solution, EIS and salt spray test were conducted. These results show that appropriate resveratrol can improve the corrosion resistance of the coating, but excessive resveratrol is detrimental to corrosion resistance. Therefore, the optimal concentration of resveratrol in the electroplating solution is 1.0 g/L.
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Functional Materials Letters
·
2020
·
IF 2
Yao Liu,Ciqun Xu,Huan Ren,Zaixin Wei,Zidong Zhang
Meta-composites with negative permittivity are promising candidates for future electronics such as microwave absorbers, novel capacitors, etc. In this work, we proposed to develop the Fe/BaTiO 3 meta-composites with tuneable negative permittivity. Fe content influenced the conductivity of composites and even led to the change of the conductive mechanism. The tuneable permittivity behavior was achieved by controlling the Fe fraction, and the plasma oscillation theory was employed to explain the negative permittivity behavior. Meanwhile, a frequency-switched negative permittivity was observed in this composite, which could be used to extend applications of meta-composites.
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RSC Advances
·
2023
·Vol. 13
·期 35
·24812-24818
·
IF 3.9
Songtao Xiao,Yubing Xue,Jing Zhao,Xiechun Liu,Haifeng Cong,Tian Lan,Xiaojuan Liu,Dashu Pan,Lingyu Wang,Guoan Ye,Yinggen Ouyang
The significant differences in the catalytic properties caused by different ‘isotopic catalysts’ were discovered for the first time. The commonly purchased Fe2O3 is a ‘mixture’ of different Fe isotopic oxides which means the catalytic effect of Fe2O3 is theoretically a synthetical result of all isotopic compounds. In this work, the differences in catalytic properties of α-Fe2O3 with natural abundance ratio and separated isotopic α-Fe2O3 (α-54Fe2O3, α-56Fe2O3, and α-58Fe2O3) catalyzing thermal decomposition of ammonium perchlorate (AP) were investigated, and are mainly attributed to the difference in the charge distribution of the nuclei of different iron isotopes. The result suggests that isotope effects in different isotopes when utilized as catalysts are caused by nuclear morphology and the nuclear charge distribution. This study will serve as a base as well as an initiation for future studies of the isotopic catalyst.
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PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1057
·
IF 3.9
Rongwei Zheng,Ruifan Tan,Yali Lv,Xiaoling Mou,Junqiao Qian,Ronghe Lin,Ping Fang,Weidong Kan
Iron-based materials are widely applied in Fenton chemistry, and they have promising prospects in the processing of wastewater. The composition complexity and rich chemistry of iron and/or oxides, however, hamper the precise understanding of the active sites and the working mechanism, which still remain highly controversial. Herein, iron oxides of four different model systems are designed through a conventional precipitation method plus H2reduction treatment. These systems feature Fe@Fe3O4with abundant oxygen vacancy, Fe0and Fe3O4particles with interface structures, and Fe3O4-dominated nanoparticles of different sizes. These materials are applied in the decomposition of methyl orange as a model reaction to assess the Fenton chemistry. The Fe@Fe3O4with core–shell structures exhibits significantly higher decomposition activity than the other Fe3O4-rich nanoparticles. A thin Fe3O4layer formed by auto-oxidation of iron particles when exposed to air can boost the activity as compared with the Fe0and Fe3O4particles with interface structures but poor oxygen vacancy. The unique hetero-structure with the co-existence of both metallic iron and oxygen vacancy displays excellent redox propensity, which might account for the superior Fenton activity. This finding provides a new perspective to understand and design highly efficient iron-based Fenton catalysts.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Zijun Dong,Chengchun Jiang,Jingxin Yang,Xi Zhang,Weili Dai,Pengwei Cai
This work investigates the transformation of iodide (I − ) by Fe(II)-activated peroxydisulfate (PDS). The transformation of I − into iodate (IO 3 − ) is a two-step process, involving reactive iodine species, such as hypoiodous acid (HOI), as a key intermediate, and IO 3 − as the final product. In the first step, SO 4 •- produced by Fe(II)-activated PDS is mainly responsible for the transformation of I − into HOI. In the second step, Fe(IV) formed by the reaction of Fe(III) with PDS is required, to facilitate the further oxidation of HOI to IO 3 − . The disproportionation of HOI and the oxidation by PDS alone contribute negligibly to IO 3 − formation. The IO 3 − yield increases to a maximum, before decreasing gradually, with increased PDS and Fe(II) dosages. The transformation of I − into IO 3 − is favored by lower pH and higher temperature, due to the greater SO 4 •- production by the reaction of Fe(II) with PDS under these conditions. Humic acid , as a representative natural organic matter, scavenges the formed HOI to form iodinated disinfection byproducts , which largely inhibit the transformation of I − into IO 3 − . In addition, the transformation of I − into IO 3 − and iodinated disinfection byproducts by Fe(II) activated PDS was confirmed in the natural waters.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Ying’hua Xu,Hai’feng Li,Cheng’pu Chu,Ping Huang,Chun’an Ma
A carbon felt was used as the cathode material for the indirect electrochemical reduction of indigo in alkaline aqueous solution employing iron-triethanolamine (Fe-TEA) complex as a redox mediator. Surface structure and specific surface area of the carbon felt electrode and its electrochemical performance toward the reduction of indigo were investigated by SEM, BET, and cyclic voltammetry, respectively. Moreover, an optimization of different operating conditions for the reduction of indigo was performed with an H-cell. In particular, the dependence of current efficiency (CE) on electrolysis time was chosen to analyze the indirect electrochemical reduction mechanism of indigo. The results showed that the carbon felt, having a high specific surface area of approximately 7289 cm2·g–1, is an excellent electrode material for the indirect electrochemical reduction of indigo and that a moderate current density, temperature, and concentration of indigo has the most beneficial effects on the reduction process.
研究领域:
环境科学
·
电化学
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DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Xilong Wang,Hongwei Zhu,Chen Yang,Jiajia Lu,Lirong Zheng,Han-Pu Liang
Single-atom Fe–N–C electrocatalysts are attracting more attentions as one most promising transition metal based single-atom catalyst towards the oxygen reduction reaction (ORR). However, the inaccessibility of internal Fe-N x active sites and insufficient stability hinder their large-scale application. Herein, a facile benzoate-assisted self-template strategy which could dramatically enhance the oxygen reduction reaction catalytic performance and stability of ZIF-8 derived atomically dispersed Fe–N–C catalysts (Fe-SA/Meso-C) is developed. The sodium benzoate used in the present work is effective for promoting the formation of Fe–N–C catalysts with denser accessible active sites as well as mesopores with diameters ranging from 2.5 to 5 nm. These structural advantages make the synthesized Fe-SA/Meso-C catalysts afford excellent electrocatalytic performance for the ORR in 0.1 M KOH with a positive half-wave potential (E 1/2 ) of 0.926 V vs. RHE and exceptionally high kinetic current density (J k ) of 92.5 mA cm −2 at 0.85 V. Beyond that, Fe-SA/Meso-C shows outstanding long-term stability with over 90% activity retain after 90 h chronoamperometry i-t test as well as superior tolerance to methanol crossover . More importantly, the assembled zinc-air battery with Fe-SA/Meso-C as the cathode material achieves a high peak power density of 166.2 mW cm −2 and a high specific capacity of 776.1 mA h g −1 . Our results reveal that small mesopores in atomically dispersed Fe–N–C electrocatalysts could facilitate mass transport, increase the accessibility of active sites and optimize the interface between electrolyte and carbon matrix, thus optimizing their electrocatalytic performance for the ORR. This work paves a way to the design and synthesis of stable single-atom electrocatalysts with optimized structure, electrochemical performance and promising applications.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
RSC Advances
·
2026
·Vol. 16
·期 6
·5501-5514
·
IF 4.6
Lian Yu,Baozi Lu,Zhen Liang,Dabin Wang,Jiarui Lu,Fengyi Wei,Cunzhen Liang
The slow rate of the Fe3+/Fe2+ cycle has decreased the efficiency of photo-Fenton technology for wastewater treatment. Here, a novel GO/MIL-100(Fe)@Fe3O4 heterostructure was constructed by growing Fe3O4 nanoparticles and MIL-100(Fe) onto GO, thus accelerating the Fe3+/Fe2+ cycle and improving catalytic activity, and it was used as a heterogeneous photo-Fenton catalyst for ERY degradation. The catalyst was fully characterized by TEM, XRD, Raman spectroscopy, XPS, N2 adsorption–desorption and UV-vis DRS. The influences of initial solution pH, H2O2 concentration and catalyst dosage on ERY degradation were investigated. Under optimal conditions (initial pH of 4.03, 10.0 mM H2O2, 0.1 g L−1 catalyst), the GO/MIL-100(Fe)@Fe3O4 + H2O2 + vis system removed 97.3% of ERY (0.1 mmol L−1) within 60 min, and the pseudo-first-order rate constant was 0.0575 min−1. Furthermore, the catalyst showed favorable stability, maintaining excellent catalytic activity even after 4 cycles. A possible degradation mechanism of ERY was proposed based on the results of characterization, ERY degradation, and reactive species analysis. Fe3O4, MIL-100(Fe) and GO in the catalyst showed synergistic effects; the photo-induced electrons from MIL-100(Fe) could be immediately transferred to Fe3O4, promoting Fe3+ reduction to Fe2+ in the photo-Fenton reaction. GO in the catalyst could promote electron transfer from MIL-100(Fe) and organics to Fe3O4, significantly promoting the Fe3+/Fe2+ cycle.
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Heliyon
·
2023
·
IF 4
T. Widjaja,N. Hendrianie,S. Nurkhamidah,A. Altway,Bayu Yusuf,Fakhrizal F,Aisyah Alifatul Zahidah Rohma,Atha Pahlevi
LASC catalyst synthesis process was carried out using iron metal (Fe) and its characterization properties were tested. There are five stages carried out, namely, the manufacture of the LASC Fe(DS)3 catalyst, lactic acid dehydration, polycondensation of lactic acid into l -lactic acid oligomers (OLLA), depolymerization of oligomers into l -lactide, and the ROP process to convert l -lactide into Polymers. l -lactic acid (PLLA). The analysis used is as follows, Karl-Fisher; Spectroscopy Fourier Transform Infrared (FTIR); and Nuclear Magnetic Resonance (HNMR); Gel Permeation Chromatography (GPC); Thermogravimetry Gravity Analysis (TGA) and X-Ray Diffraction (XRD). Based on the experimental results, the catalyst Fe(DS) 3 has a crystallinity value of 24% which indicates an amorphous nature and is easy to react. The value of the thermal stability of the catalyst is at 180 °C where the catalyst is able to process up to a temperature of 180 ° C. Each step of the ROP is validated by FTIR analysis which shows that the components of the group are in accordance with the expected product. The comparison of the crystallinity values of PLA produced with FeCl 3 and Fe(DS) 3 were 37.5 and 49%, respectively. Melting temperature (Tm) values are 111 and 107 ° C, respectively, Td values are 327 and 352 °C, and the resulting molecular weights are 23,720 and 20,232 g/mol. Based on the results obtained, it can be seen that the use of a LASC catalyst in the form of Fe(DS) 3 is more effective than without using a LASC catalyst.
研究领域:
高分子化学
·
材料科学
·
催化化学
·
绿色化学
·
生物高分子
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高影响因子
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
·
2020
·Vol. 125
·期 12
·e2020JE006590
·
IF 3.717
Peixin Du,Peng Yuan,Jiacheng Liu,Yixuan Yang,Hongling Bu,Shun Wang,Junming Zhou,Hongzhe Song,Dong Liu,Joseph R. Michalski,Chengshuai Liu
Allophane, a common component on Earth and a probable constituent of the amorphous component on Mars, is closely associated with Fe in the form of structural Fe and/or iron (oxyhydr)oxide coatings. However, until now, the formation and evolution of allophane as products of environmental Fe concentrations have rarely been studied. We investigated allophane precipitation from gels with different Fe/(Fe + Al) molar ratios ( n , 0 ≤ n ≤ 1.0). X-ray diffraction patterns and Fourier transform infrared spectra of the products showed that allophane was nearly the only product at n ≤ 0.2 and that the crystallinity of Fe-rich allophane decreased with increasing n . Combined with the results of transmission electron microscopy and Mössbauer spectroscopy, Fe was found to be mainly incorporated into the gibbsite-like sheet of allophane, forming clusters; the highest Fe-for-Al substitution content was roughly estimated to be 20 mol.%. As n increased further, the formation of allophane was increasingly suppressed, and the Fe phases began to separate from the Al-Si phases, resulting in mixtures of incipient allophane and incipient akaganeite and finally akaganeite. The near-infrared spectroscopic data (1.2–2.6 μ m) of the products showed incapability in identifying poorly ordered minerals in Al-Si-Fe systems, while the features in the range of 0.4–1.2 μ m were powerful for studying iron occurrence in the products. These findings not only offer insights into the formation, evolution and geological role of allophane in Al-Si-Fe systems on Earth but also help constrain the paleoenvironment of locations where allophane and akaganeite co-occur on Mars. Key Points Environmental Fe concentrations control the formation and evolution of allophane in Al-Si-Fe systems Near-infrared spectra (1.2–2.6 μ m) show incapability in identifying short-range ordered minerals in Al-Si-Fe systems Co-occurrence of allophane and akaganeite would constrain the local palaeoenvironment on Mars
研究领域:
地质学
·
行星科学
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高影响因子
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