JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
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2024
·Vol. 129
·期 4
·e2023JE008031
·
IF 3.9
Xinyi Xiang,Peixin Du,Binlong Ye,Hongling Bu,Dong Liu,Jiacheng Liu,Jian Hua,Xiaolong Guo
Ferrihydrite, a nanocrystalline iron (oxyhydr)oxide mineral, is widely distributed in soils and sediments on Earth and is probably an important component and/or precursor of widespread nanophase iron minerals on Mars. Terrestrial ferrihydrite often co-occurs with amorphous silica and/or contains a certain amount of Si in its structure. However, it remains ambiguous how environmental Si concentration affects the formation-evolution and structure-spectral features of ferrihydrite in the Fe(III)-Si systems. To this end, hydrolysis experiments were carried out for Fe-Si systems at an unprecedentedly wide range of initial Si/(Fe + Si) molar ratios (0–0.80), followed by characterizing the products detailly. X-ray diffraction, Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, Mössbauer spectroscopy, and transmission electron microscopy results showed that at Si/(Fe + Si) molar ratios ≤0.30, the main phase of the products was ferrihydrite, of which the unit cells enlarged, the crystallinity decreased, and the existing state of Fe changed with increased Si contents; at Si/(Fe + Si) molar ratios ≥0.40, ferrihydrite was no longer formed and a novel amorphous Fe-O-Si phase was instead obtained, with the excess Si forming amorphous silica. The visible and near-infrared spectroscopy, the most powerful tool to detect hydrous minerals on the surface of Mars at global or regional scales, showed weakness in identifying ferrihydrite-like materials obtained in the Fe-Si systems. Raman spectroscopy can identify ferrihydrite and Si-containing ferrihydrite but cannot differentiate between them. Mössbauer spectroscopy showed great potential in both identifying and differentiating between ferrihydrite and Si-containing ferrihydrite, and thus can be used to characterize the poorly ordered iron (oxyhydr)oxides on Mars. Key Points Hydrolysis experiments of Fe(III)-Si systems were performed at an unprecedentedly wide range of initial Si/(Fe + Si) molar ratios (0∼0.80) The environmental Si concentration controls the formation and evolution of ferrihydrite in the Fe(III)-Si systems Mössbauer spectroscopy shows great potential in identifying and differentiating between ferrihydrite-like materials Plain Language Summary On the surface of ancient Mars where liquid water was available, Fe-Si hydrolysis systems were likely common as a result of the high abundances of Fe and Si in the crust of Mars. By performing hydrolysis experiments of Fe-Si systems at an unprecedented wide range of Si/(Fe + Si) molar ratios, we found that the hydrolysis products of Fe-Si systems varied among combinations of ferrihydrite, Si-containing ferrihydrite, an unknown Fe-O-Si phase, and amorphous silica. We also found that the visible and near-infrared reflectance spectroscopy, the most powerful tool to remotely detect hydrous minerals on the surface of Mars at global and regional scales, showed weakness in identifying ferrihydrite, Si-containing ferrihydrite, and the novel Fe-O-Si phase; Raman can be used to identify ferrihydrite-like materials but cannot be used to differentiate between ferrihydrite and Si-containing ferrihydrite; mid-infrared spectroscopy can differentiate ferrihydrite from Si-containing ferrihydrite and the novel Fe-O-Si phase; Mössbauer spectroscopy (recorded at varied temperatures) provided clues to identifying and further differentiating between ferrihydrite-like materials and thus holds great potential for detecting Fe/Si-rich phases on the surface of Mars.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaofang Cao,Mingkai He,Baopeng Ma,Shixuan Liu,Xiaohui Pang,Mingzhen Song,Fudong Zhang,Xiaolian Chao,Zupei Yang,Di Wu
The band degeneracy thus thermoelectric performance of (Fe, Co)Sb 3 based p -type skutterudites can be well modulated by adjusting Co/Fe ratio. Combining systematic experiments and density function theory (DFT) calculations, we revealed in this work that the variation of Co/Fe ratio could result in complicated and mutually coupled effects on the individual thermoelectric parameters (band degeneracy, band gap, Fermi level , filling limit of fillers, phonon spectrum, etc.) and that using Co/Fe ratio to improve the overall thermoelectric figure of merit is nontrivial. We eventually found that the optimal Co/Fe ratio for Mm (Misch metal) filled (Fe, Co)Sb 3 lies at 1.3:2.7, which is somewhat off the Co/Fe = 1:3 point where the largest valence band degeneracy appears. Extra Sb was then introduced to compensate Sb volatilization for improved electrical transport performance. An overall peak figure of merit ZT max of 1.06 was eventually achieved in the sample Mm 0.8 Fe 2.7 Co 1.3 Sb 12.60 , which is among the highest ones for all reported (Fe, Co)Sb 3 based p -type skutterudites so far.
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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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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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Energy Storage Materials
·
2020
·
IF 16.28
Chong Bai,Huijie Jin,Zongshuai Gong,Xizheng Liu,Zhihao Yuan
Aqueous Fe-I 2 rechargeable batteries are highly desirable for large-scale energy storage because of their intrinsic safety, cost effective, and wide abundance of iron and iodine. However, their development suffers from Fe dendrite growth and severe shuttle effect during cycling. Herein, we demonstrate a high-performance Fe-I 2 rechargeable battery using metal iron as anode, iodine/hierarchically porous carbon composite as cathode and an eco-friendly aqueous electrolyte. The anode modified with ascorbic acid effectively suppresses the formation of iron dendrite, while the cathode doped with nitrogen greatly reduces the shuttle of iodine species. The battery operates a reversible redox reaction of FeI 2 /I 2 pair with fast kinetics. A capacity ~190 mAh g -1 at current densities up to 5000 mA g -1 and excellent cycle stability of 100% after 550 cycles at 2000 mA g -1 are obtained. The battery achieves superior power density of ~1300 W kg -1 at 120 Wh kg -1 and high energy density of 130 Wh kg -1 at 356 W kg -1 . Our study shows great promise for high-performance rechargeable batteries with low-cost, eco-friendliness and high safety.
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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.
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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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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Zheyu Huang,Jingzhong Kuang,Tingsheng Qiu,Mingming Yu
The similarity in surface properties between scheelite and calcite makes their flotation separation particularly challenging, thereby severely limiting the efficient utilization of tungsten resources. In this paper, Fe-SYA and Fe-GA colloidal complexes were synthesized via a metal-organic coordination strategy using Fe³⁺ with salicylic acid (SYA) and gallic acid (GA), respectively, and their structure-dependent flotation regulation mechanisms were systematically investigated. The structural stability, interfacial adsorption behavior, and their relationship with flotation selectivity were elucidated through contact angle measurements, zeta potential analysis, XPS, TEM and DFT calculations. The results showed that Fe-SYA and Fe-GA preferentially adsorbed on the calcite surface at pH=4 and a ratio of 1:1/2, significantly reducing calcite hydrophobicity and collector adsorption, while exerting only a minor effect on scheelite, thereby enabling selective separation. Owing to its abundant phenolic hydroxyl groups, Fe-GA formed a stable reticulated polydentate coordination structure with enhanced electronegativity and spatial stability, facilitating the formation of a dense inhibition film on calcite and yielding superior flotation performance, with a WO₃ concentrate grade of 71.03% and a recovery of 86.54%. In contrast, Fe-SYA exhibited lower structural stability and was prone to hydrolysis into Fe(OH)₃ colloids under alkaline conditions, resulting in non-selective inhibition. This work elucidates the structure–selectivity relationship of metal-organic colloidal complexes and provides a green and efficient strategy for the flotation separation of calcium-bearing minerals.
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