JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Hao Han,Xiaomei Wang,Xu Zhang
Doping Fe N C catalysts with heteroatoms has been widely recognized as a most promising way to improve the electrocatalytic activity to achieve the replacement of Pt-based electrocatalysts for efficient oxygen reduction reaction (ORR). However, it is still a challenge to combine delicate control of the catalyst structure with heteroatom-doping to achieve optimal electrocatalytic efficiency. Herein, a strategy of combining chemical vapor deposition (CVD) with dual-template cooperative pyrolysis was rationally designed to synthesize the novel electrocatalyst with densely isolated single Fe atoms scattered on hierarchically ordered porous N and S codoped carbon (ISA-Fe/HOPNSC). The three-dimensional hierarchically ordered interconnected macro/mesoporous structure and uniform sulfur-doping make ISA-Fe/HOPNSC exhibit superb ORR performance in both alkaline and acidic electrolytes with a positive half-wave potential (0.920 V in 0.1 M KOH and 0.795 V in 0.5 M H 2 SO 4 ) as well as outstanding methanol tolerance and long-time stability. As cathode catalyst in Zn-air battery, ISA-Fe/HOPNSC also provides much better maximum power density (210.7 mW cm −2 ) and specific capacity (796.7 mAh g Zn −1 ) than those of Pt/C (112.6 mW cm −2 and 712.6 mAh g Zn −1 ). Remarkably, the synthesis strategy in this work proposes myriad opportunities for combining delicate control of the catalyst structure with heteroatom doping to synthesize high-performance ORR catalysts.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2026
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IF 3
F.F. Yan,S.L. Zhang,T. Li,T.T. Zhang,H.Y. Dai
This study focuses on the regulatory effects of structural evolution and vacancy defects induced by Fe-ion substitution at the Mn site on the physical properties of gadolinium manganite (GdMnO 3 ) materials synthesized via the solid-phase reaction method. The single-phase structure of synthesized GdMn 1- x Fe x O 3 ceramics was confirmed by X-ray diffraction (XRD) and Raman analyses, and lattice deformation due to the substitution of Mn ions with Fe ions in GdMnO 3 was observed. X-ray photon spectroscopy (XPS) results confirmed the presence of Fe 2+ /Fe 3+ and Mn 4+ /Mn 3+ in the GdMn 1- x Fe x O 3 samples, and their mutual interactions led to changes in their relative concentrations. Positron annihilation spectroscopy results indicated that Fe 3+ substitution significantly influences the size and concentration of vacancy defects in the GdMn 1- x Fe x O 3 system. Temperature and magnetic field dependent magnetization measurements revealed that Fe-ion substitution could improve the magnetic properties of GdMnO 3 . Compared with the magnetic moment contribution from Fe ions, the double-exchange interaction between Mn 3+ and Mn 4+ ions, cation vacancies, and lattice distortion caused by Fe ion substitution exerted more dominant influence on the magnetic properties of GdMnO 3 . These results demonstrate that the introduction of vacancy defects and the conversion of Mn 3+ to Mn 4+ represent an effective strategy for optimizing the properties of the GdMnO 3 system.
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Nanomaterials
·
2026
·Vol. 16
·期 11
·700
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IF 4.8
Wenqi Gao,Yuan Meng,Xinran Zhang,Liqiang Liu,Yunjie Zhang,Jin Zhou,Zifei Sun
Iron-based carbon nanofibers (Fe-CNFs) have garnered significant attention due to their promising applications as functional materials or precursors in the field of catalysis, energy storage, and electromagnetic interference shielding. In this work, electrospun Fe3O4-CNFs were reduced under a H2/Ar atmosphere to obtain Fe-CNFs, and the reduction temperature and holding time were systematically optimized. Notably, a pronounced carbon gasification phenomenon was observed at elevated temperatures (>550 °C), leading to a complete consumption of the carbon matrix. The underlying mechanism was explored using temperature-programmed reduction with mass spectrometry (TPR-MS) and density functional theory (DFT) calculations. The results suggest that the carbon gasification during the H2reduction process is primarily driven by the carbon-water reaction, which can be catalyzed by the in situ-formed Fe nanoparticles. As the temperature increases, various reactions—including hydrogen dissociation, H2spillover, carbon-water reaction, and Boudouard reaction—may progressively consume the carbon framework, ultimately leading to structural collapse and complete material loss. This study elucidates the underlying mechanism of carbon-water reaction and provides practical guidance for the optimization of synthesis parameters, thereby enhancing the yield and structural integrity of free-standing Fe-CNFs for their application in catalysis and energy storage-related fields.
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Journal of Environmental Sciences
·
2025
·
IF 6.3
Junhui Li,Hanjie Chen,Hongling Bu,Yanfu Wei,Meiqing Chen,Wenpo Xu,Xiangying Hao,Peng Yuan
The interaction between divalent iron (Fe(II)) and humic substances (HS) is crucial for geochemical cycles in terrestrial and aquatic environments, influencing soil phosphorus (P) cycling and aquatic eutrophication. However, the impact of Fe(II)-HS interactions on P sequestration remains unclear. This research employed controlled lab experiments and advanced characterization techniques, such as X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscopy (SEM), to study the mechanisms of P fixation by Fe(II)-HS complexes under neutral pH and anaerobic conditions. Results indicate that Fe(II) availability is crucial for P fixation, more so than HS content. Elevated Fe/P ratios boost P removal by encouraging vivianite formation, even in the presence of HS, reducing dissolved P to below 0.3 mg/L at Fe/P of 2.2. HS primarily hinders P adsorption through competitive ligand exchange. Solution pH also impacts P fixation, with higher pH levels (≥7) enhancing P immobilization. While HS binds Fe(II) and prevents hydrolysis, Fe(II) hydrolysis products like Fe(OH) 2 /Fe(OH) 3 − can co-precipitate and remove P. XRD analysis indicated vivianite crystals form at pH 7, but their diffraction peak intensity decreases under acidic or alkaline conditions, with formation controlled by Fe species and HS. The potential pathways of P in the Fe(II)-HS system include P combining with Fe(II) to form vivianite, P combining with HS to form HS-P composites, and P combining with Fe(II)-OM species to form carbon-containing vivianite. These insights improve understanding of the Fe-C-P biogeochemical cycle and P mobility in natural environments.
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TURKISH JOURNAL OF CHEMISTRY
·
2022
·Vol. 41
·期 6
·944-954
·
IF 1.151
YUAN XIAOTONG,QIN DAWEI,QIAO MIN,LIU GANG,LI HONGXIN,NIU XIA
The objective of the current effort was to determine the efficacy of Fe(II)-montmorillonite (Fe(II)-MMT) as an adjuvant for specific targeted adsorption of phosphate. Specifically, Fe(II)-MMT was studied to combat hyperphosphatemia and anemia arising from chronic renal failure. The adsorption of phosphate over time, pH, and initial concentration was studied. The systems were characterized by X-ray diffraction (XRD), Raman, and zeta potential. The experimental results demonstrated the adsorption time was set to 140 min to achieve maximum adsorption efficiency. It was thus found that the maximum adsorption was at pH 3.0. In addition, it reached equilibrium when the initial phosphate concentration was at 60 mg/L while the maximum adsorption capacity was 5.75 mg of phosphate/g of Fe(II)-MMT. On the other hand, adsorption isotherms showed that the Langmuir model was better than the Freundlich model. This means that the adsorption of the phosphate on Fe(II)-montmorillonites was monolayer adsorption, and the phosphate was successfully adsorbed either onto the surface or intercalated within interlayer volume. Live experiments supported the ability of Fe (II)-MMT to control hyperphosphatemia and treat chronic renal failure.
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Nature Communications
·
2026
·
IF 15.7
Shen Shiji,Wu Zhenduo,Liu Xiaoye,Lan Si,Wang Chengwei
With increasingly stringent application environments, there is a growing demand for designing and fabricating of promising structural materials. Conventional metallurgical methods typically struggle to produce positive mixing enthalpy alloys with uniform microstructures and consistent properties due to mutual immiscibility and uncontrollable segregation during solidification. To this end, we employ a bottom-up approach to fabricate Cu-50 vol% Fe 55 Cr 25 Mo 16 B 2 C 2 positive mixing enthalpy composites, utilizing ultrafast high-temperature sintering and instantaneous quenching. The method effectively prevents liquid segregation during the molten state and allows precise control over the size and distribution of the two phases. In addition, incorporated metallic glass particles as the hard phase additives, which can quickly form the localized multi-phase nanocrystals and establish a robust interlocking structure with pure copper during rapid sintering. Upon rapid quenching, the two phases solidify with a tight and conformal interface, while the elemental cross-diffusion and phase separation are mitigated. The mechanical tensile strength of the resulting composite is approximately 8 times greater than that of pure Cu. The wear resistance improves by 40-50 times, and the Vickers hardness increases by a factor of 10. The innovative sintering method provides a feasible pathway for developing and manufacturing of positive mixing enthalpy composite materials.
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CEMENT AND CONCRETE RESEARCH
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2026
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IF 14
Jiaxing Ban,Ruotao Yang,Sergey V. Churakov,Barbara Lothenbach,John L. Provis,Kaifeng Wang,Haixing Fang,Bin Ma
Understanding Fe incorporation in layered double hydroxide (LDH) phases is important for revealing the steel/cement interface interaction in low carbon cement. In this study, synchrotron-based characterization is combined with density functional theory (DFT) calculations to unravel the atomistic mechanisms controlling Fe(III) incorporation in Mg Al LDHs as a function of composition and local structure. XAS measurements reveal that Fe incorporation is strongly suppressed under trivalent-cation-rich compositions, leading to a preferential association of Fe with edge or defect-related environments. The spectra indicate that Fe(III) is incorporated into the LDH lattice in a well-defined octahedral environment under Mg-rich compositions. DFT calculations of substitution energies support these findings by showing that Fe(III) substitution for Al(III) in the main layers is strongly composition-dependent: Fe(III) incorporation is most unfavorable at Al-rich compositions but becomes progressively more favorable in Mg-rich environments. In Al-rich LDHs, Fe shortens neighboring Al O bonds, introducing local strain and lowering mechanical stability, while in Mg-rich LDHs the more flexible Mg O framework accommodates Fe(III) more effectively. Overall, this study defines molecular-level constraints governing Fe(III) incorporation into LDH phases in low-carbon cements. The results offer transferable insights concerning the influence of LDH composition on the interfacial phase assemblages relevant to steel corrosion protection.
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Advanced Science
·
2025
·
IF 14.1
Zihao Yang,Chao Feng,Yifan Liu,Yong Yang
The scaling relationship limit poses a significant challenge in single-atom catalysts (SACs) for reactions involving multi-intermediate interactions, such as the electrocatalytic nitrogen reduction reaction (eNRR) for ammonia synthesis. To overcome this limitation, a heteronuclear dual Ru-Fe sites on N,S-codoped Ti 3 C 2 T x nanosheet (referred to as Fe 1 -N^S-Ru 1 /Ti 3 C 2 T x ) with precisely designed asymmetric coordination for eNRR is developed. Advanced characterizations verify the unique asymmetric coordination structure where Ru and Fe atoms are individually coordinated to N and S atoms, respectively, with the two metal centers interconnected via bridging N and S atoms. This catalyst achieves remarkable eNRR performance with an NH 3 yield rate of 32.8 µg h −1 mg −1 cat at −0.55 V and 47.1% Faradaic efficiency at −0.25 V, surpassing its homonuclear analogues by 3.2- and 2.3-fold in activity and ≈3.0-fold in selectivity. Experimental and theoretical studies reveal a synergistic mechanism, in which Ru sites effectively dissociate H 2 O to supply protons while the adjacent Fe sites selectively activate N 2 , effectively decoupling proton supply from N 2 activation but also benefiting the formation of key intermediate * NNH. Additionally, the electronic interaction between Ru and Fe sites also lowers the energy barrier of the rate-determining step, thereby significantly enhancing catalytic activity and selectivity.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
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IF 22.1
Linkai Wang,Yu Han,Jian Wei,Qingjie Ge,Shijian Lu,Yanpeng Mao,Jian Sun
Hydrogenation of CO 2 into light olefins is an important route to carbon neutrality . Most of traditional researches focus on the catalyst component, structure, and promoter to enhance the selectivity of light olefins while ignoring the diffusion of products. Here, we report a NaFeZr-MOR composite catalyst for light olefin synthesis in CO 2 hydrogenation via pore confinement. The selectivity in hydrocarbons and STY (Space-time yields) of C 2–4 = is gradually increasing maximum up to 51.3% and 12.2 (mmol·g cat −1 . h −1 ), which lie in a high level among reported Fe-based catalysts. Further characterization revealed that the essence of selectivity change period is the accumulation and evolution of carbonaceous species, which causes the change of product diffusion behavior. It suppresses the escape of heavy hydrocarbons from MOR pores, leading to an increased light olefin, especially ethylene, which is called “dynamic confinement”. These findings provide a new insight for controlling low-carbon product selectivity in CO 2 hydrogenation.
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ANALYST
·
2023
·Vol. 148
·期 8
·1838-1847
·
IF 4.2
Zhidong Zhao,Yuan He,Xingrui Qi,Nian Li,Zijian He,Yufang Chen,Tao Jin
Electrochemical determination of synthetic opioids such as fentanyl is meaningful but still challenging no matter from a social or academic perspective. Herein, we report a series of novel electrocatalysts based on Fe-containing metal–organic frameworks and multi-walled carbon nanotubes (Fe-MOF/MWCNTs). The obtained Fe-MOF/MWCNT electrode materials all show ultrasensitivity on fentanyl determination. In particular, MOF-235/MWCNTs even exhibit an ultra-low limit of detection (LOD) of 0.03 μM with a wide linear range from 0.1 to 50 μM. Besides, this series of Fe-MOF/MWCNTs also displays excellent repeatability, selectivity, and stability. Moreover, they show good performance in real sample detection and achieve good recovery of 95.47%–102.41% and 96.62%–103.15% in blood and urine samples, respectively. This high performance in fentanyl determination is mainly contributed by the Fenton-like process and the adsorption function of the Fe-MOF. Therefore, these novel Fe-MOF/MWCNTs are promising electrocatalysts for point-of-care device fabrication and also have potential applications in fentanyl rapid test technology.
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LANGMUIR
·
2023
·
IF 3.9
Fengye Guo,Wenhua Li,Yefan Liu,Qianqiao Chen,Qin Zhong
Transition metal phosphides with excellent performance are one of the effective alternatives to noble metal catalysts in overall water splitting. In this paper, the Fe–NiCoP–MoO3 composite was prepared by a facile synthesis as the bifunctional electrocatalyst. Fe–NiCoP–MoO3 achieves an operating current density of 10 mA/cm2 at a low overpotential of 65 mV for hydrogen evolution reaction and drives an operating current density of 50 mA/cm2 at only 293 mV for oxygen evolution reaction. Significantly, Fe–NiCoP–MoO3 was employed as the anode and cathode for overall water splitting, which only requires a cell voltage of 1.586 V to reach 10 mA/cm2 as well as shows excellent stability. The electrocatalytic activity of Fe–NiCoP–MoO3 exceeds most of the recently reported typical bifunctional electrocatalysts. This may be due to the coupling effect between the polymetallic phosphides. In addition, heterogeneous catalysts generally expose more active sites than homogeneous catalysts. In addition, replacing MoO3 with WO3 and VO3 can also improve the performance of Fe–NiCoP. This work provides an idea for the modification of phosphides.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ruiling Sun,Guilong Yan,Xunlong Zhang,Zhenyu Li,Jingyu Chen,Li Wang,Yuanpeng Wu,Yiqun Wang,Han Li
The nanomaterials with multiple components and various heterogeneous interfaces have been considered as preferred efficient electromagnetic wave (EMW) absorbers. In this paper, Fe atoms were bonded to a zeolitic imidazole framework (Fe-ZIF) and Fe-ZIF-derived hollow porous carbon nanofibers (Fe-HPCNFs) were prepared by the microfluid electrospinning method. The EMW absorption properties of carbon nanofibers (CNFs), Fe-ZIF-derived carbon nanofibers (Fe-CNFs), and Fe-ZIF-derived hollow porous carbon nanofibers (Fe-HPCNFs) were systematically studied. The results showed that Fe-HPCNFs has the best performance, when the thickness was only 2.0 mm, the Fe-HPCNFs achieved a minimum RL loss of −46.9 dB at 17.38 GHz, with an effective absorption bandwidth of 3 GHz. The Fe-HPCNF is a flexible, ultralightweight, self-supported material as a potential high-efficiency EMW absorber.
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