JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Xueke Li,Yan Liu,Hao Zhu,Jianmin Yang,Long Sun,Jinru Han,Zhiqiang Wang,Weidi Kong
This study focuses on the microalloying effects of iron in CuCr alloys prepared via liquid-phase sintering, with a comparative analysis of the changes in composition, microstructure, and properties before and after Fe doping. The research finds that Fe microalloying in CuCr alloys can be achieved through liquid-phase sintering coupled with copper infiltration. Fe mainly combines with Cr in solid solution or compound form and preferentially segregates at the Cu/Cr two-phase grain boundaries. The doping of Fe acts as a bridge, promoting the diffusion of Cu into the Cr phase. As a result, spherical Cu particles appear within the Cr-rich phase of the Fe-doped alloy, and the Cr-rich phase becomes progressively refined. Meanwhile, finely dispersed Cr phases are observed in the Cu-rich phase of the CuCrFe alloy, which serve as second-phase strengthening particles in the Cu matrix. Compared to the requirements of GB/T 24269–2009, the prepared CuCr47Fe3 alloy exhibits improvements in relative density, electrical conductivity, and hardness by 0.87 %, 39.5 %, and 33.3 %, respectively. These enhancements are primarily attributed to the reduction in the Cu-Cr interfacial binding energy from −33.46 eV to −33.91 eV due to Fe doping, resulting in better interfacial bonding between Cu and Cr and a more stable product system.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 46
·24598-24607
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IF 11.301
Chizhong Wang,Rong Wang,Yue Peng,Jianjun Chen,Zhen Chen,Haibo Yin,Junhua Li
Development of new groups of oxygen evolution reaction (OER) electrocatalysts based on transitional metal materials is highly attractive for renewable energy conversion and storage. Here we report a new FeNb (oxy)hydroxide catalyst, which delivered a high OER activity with an overpotential as low as 0.34 V (at 10 mA cm−2). To attain a homogeneous mixing of metal components, niobium was initially incorporated into the framework of iron oxalate dihydrate. The mixed oxalate could be structurally transformed into short-range ordered (oxy)hydroxide, the reactive species for the OER. Incorporation of Nb has been demonstrated to improve the intrinsic OER activity based on Fe species and to accelerate the charge-transfer kinetics across the solid-electrolyte interface. It is also found that strong Fe–Nb interaction can induce the formation of high-valent Fe species. Theoretical calculation results further illustrate the role of NbOx in the OER mechanism, in which Fe serves as the active site and the Nb species can promote the conversion of *OH to *O intermediates to reduce the OER overpotential.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Xiang Li,Xiaoge Chen,Bo Wang,Gang Yu
The development of engineered nanomaterials has aroused great attention in controlling the existence of toxic micropollutants. However, their performance in complex environmental matrices is frequently neglected. Highly efficient enrichment coupled with synergistic degradation with low concentrations is challenging but significant in practical industrial applications. In this study, a large group of active pharmaceutical compounds (PACs) at environmentally relevant concentrations ∼ μg/L were rapidly extracted in core-shell MIL-100 (Fe), followed by effective degradation during the visible-light photo-Fenton process in situ. Unexpectedly, in natural secondary wastewater, adsorption capacities were inhibited (2–50 % decreased after 60 min), while the degradation kinetics of eight PACs were remarkably promoted (1.42–2.92 times higher). Under neutral pH, the accumulated pharmaceuticals within cages were effectively decomposed by •OH and 1 O 2 , mainly derived from visible-light-induced reduction of Fe (III)-cluster and the generation of ROS. The structural parameters (log K ow ) were closely correlated to the adsorption behavior (R 2 = 0.74), which remarkably facilitated the degradation. The powder was loaded onto the PTFE/ultrafiltration membrane in a flow-through reactor. The targeted PACs were rapidly degraded over the self-cleaning surface under visible light irradiation, implying a promising future for industrial application.
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 15
·3874-3884
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IF 7.779
Mengchen Song,Liuting Zhang,Zhendong Yao,Jiaguang Zheng,Danhong Shang,Lixin Chen,Hong Li
Maintaining fast hydrogen storage kinetics is a key challenge for the practical application of MgH2. To address this challenge, understanding the mechanism of kinetics that declines during cycling is crucial but it has not been systematically investigated to date. In this paper, three different Fe nanocatalysts were synthesized and then doped into MgH2 to form new composites. The MgH2-Fe composite had significantly reduced operating temperatures and activation energy compared to that of undoped MgH2. During cycling, a capacity retention of 93.4% was obtained after the 20th cycle. For a better understanding of the declining performance, prolonged incubation was intentionally performed. Grain growth was found in MgH2 and the Fe nanocatalysts, which was directly responsible for capacity loss and kinetic degradation. These findings provide fundamental insights to facilitate designing and preparing catalytic hydrogen storage systems with superior cycling performance.
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NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 45
·20881-20889
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IF 3.3
Zairan Liu,Yifei Yang,Jiaoning Tang,Yuanming Deng
Here we report a simple topochemical method to prepare Ni–Fe layered double hydroxide (LDH). Ni(II)Fe(II) hydroxide was prepared via coprecipitation of Ni2+ and Fe2+ by NH4HCO3 under anaerobic conditions at room temperature. Ni–Fe LDH was obtained via oxidation intercalation by exposing the precipitate to air. The structure of the LDH was characterized and the performance in the electrochemical oxygen elution reaction (OER) was determined. Residual Fe(II) was observed by XPS due to incomplete oxidation, resulting in Fe replacing the Ni site in the LDH. It is found that LDH embedded with both Fe–O–Fe and Ni–O–Fe moieties is beneficial to the OER in terms of a low overpotential (240 mV at 10 mA cm−2), small Tafel slope (25 mV dec−1) and high electrochemical stability.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Yiyang Lin,Tao Lin,Han Chen,Junding Yin
The effect of N , N -bis(carboxymethyl)glutamic acid (GLDA) on the removal of organic pollutants by Fe(II)-mediated periodate (PI) advanced oxidation process at neutral pH was investigated, in which N-(1,3-dimethylbutyl)- N ′-phenyl- p -phenylenediamine quinone (6PPD-Q) was used as the model pollutant. The results showed that the Fe(II)-GLDA complex formed by mixing GLDA with Fe(II) in a 1:1 ratio reacted with PI can degrade 6PPD-Q effectively. The presence of GLDA alters the redox potential of Fe(II)/Fe(III), which allows for a better utilization of Fe(II) under the synergistic effect of ultraviolet (UV) irradiation. Based on quenching experiments, sulfoxide probe transformation and electron spin resonance (ESR) signals, the reactive species that play a major role in this process are Fe IV O and IO 3 . The degradation products of 6PPD-Q were detected by Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry (UPLC-MS/MS) and two possible degradation pathways were proposed based on density functional theory (DFT) calculations. The toxicity of 6PPD-Q was found to be effectively reduced after degradation by Ecological Structure Activity Relationships (ECOSAR) software analysis and zebrafish experiments. This study provides some fundamental insights for the removal of organic pollutants by GLDA-enhanced Fe(II)/PI system under neutral conditions.
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Sustainable Energy & Fuels
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2025
·
IF 4.1
Yongheng Xiong,Yang Yu,Huangang Shi,Jifa Qu,Wenyi Tan
Single atom Fe sites, doped in CN materials, exhibit outstanding electrochemical activity for CO2-to-CO conversion. The pyrolysis of ZIF8 is a controllable method for fabricating isolated single atom metal sites. In this study, we propose a new strategy to increase the ratio of Fe in ZIF8 precursors by synergistically replacing Zn2+ with Bi3+ and Fe3+. After precursor pyrolysis, the obtained Bi/Fe–N–C catalysts, consisting of Bi sites and pyrrole-type Fe–Nx sites, serve as efficient electrocatalysts for the CO2RR. The results show that the optimized catalyst loaded with 94.8 mg per kgCat Fe exhibits a high FECO of >90.1% over a wide potential range of −0.4 to −0.7 VRHE (98.2% at −0.5 VRHE). Insights into the electrochemical reaction mechanism show that this successful design of Bi/Fe–N–C catalysts can provide a stable catalytic site to form *COOH, thus achieving energy-efficient electrochemical CO2 reduction to CO.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Jing Peng,Haoran Lei,Dandan Cao,Xiuhua Wang
CoFeP-Ni nanorods provide a large electrochemical active surface area. • CoFeP-Ni only need 55 mV for HER and 180 mV for OER to reach 10 mA cm −2 • CoFeP-Ni needs 1.443 V to acquire 10 mA cm −2 for overall water splitting. • CoFeP-Ni exhibits outstanding stability and durability for both HER and OER. The engineering of robust, inexpensive bifunctional non-precious electrocatalysts exhibiting both high efficiency and operational stability is essential for scalable water splitting systems toward sustainable energy conversion. This study developed Fe and Ni co-doped CoFeP-Ni nanorods through a hydrothermal phosphidation approach. The as-synthesized CoFeP-Ni nanorods demonstrate exceptional bifunctional electrocatalytic performance, achieving remarkably low overpotentials of merely 55 mV for HER and 180 mV for OER at 10 mA cm −2 , along with exhibiting outstanding prolonged stability. The CoFeP-Ni catalyst demonstrates superior water-splitting performance in a two-electrode system, achieving industrially relevant current densities (10/100 mA cm −2 ) at competitively lower voltages (1.443/1.692 V), eclipsing the Pt/C||RuO 2 benchmark and existing non-noble metal catalysts. This study provides fundamental insights into bifunctional catalysts while offering a new strategy for developing stable, efficient, and economical first-row transition metal electrocatalysts based on transition metals.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Mingyu Li,Chaoqun Li,Zhao Chunrui,Tianren Li,Jingjing Jiang,Zhonghui Han,Chongjun Zhang,Haoran Sun,Shuangshi Dong
Fe-based metal organic framework with high active site exposure, wide light absorption and fast H 2 O 2 activation are pivotal for photo-Fenton degradation of contaminants. However, insufficient active site exposure, weak visible light adsorption and low charge transfer efficiency in iron-oxo clusters usually lead to the slow Fe(II)/Fe(III) cycle. In this study, we develop a novel citric acid (CA)-modified MIL-88A(Fe) strategy to boost photo-Fenton efficiency by accelerating Fe(II)/Fe(III) cycle for emerging contaminants removal. Relationship between CA coordination mode and photo-Fenton performance was studied by using methylene blue (MB) and carbamazepine (CBZ) as model contaminants. It was found that the degradation rate constants of MIL-88A(Fe)-CA-3 were 6.5 and 2.6 times higher than those in the pristine MIL-88A(Fe) for MB and CBZ degradation, respectively. The optimized MIL-88A(Fe)-CA-3 also exhibited good recyclability, enabling multiple cycles in photo-Fenton reaction. The results of experimental characterizations and density functional theory calculations demonstrated that ligand substitution was conductive to active site exposure, visible light absorption, charge carrier transfer and Fe 2+ /Fe 3+ redox cycle, which are responsible for an improved photo-Fenton performance.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
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2022
·
IF 4.119
Jingjing Sun,Shangqing Chen,Junfeng Wang,Yi Nie
The reduce of the silicon concentration to low level (<5 mg·L −1 ) from the reverse osmosis brine wastewater is challenging and desirable for the maintain the membrane life and performance, as well as the wastewater treatment costs. This work focuses on the removal of silicon from the reverse osmosis brine wastewater by adding FeCl 3 into the plant wastewater for simultaneous Fe(OH) 3 formation and silicon adsorption. The effects of pH, FeCl 3 dosing concentration, reaction time, and temperature on the silicon removal ratio were investigated. It was demonstrated that the silicon removal ratio could reach up to 94% and its residual concentration was 3.2 mg·L −1 , which met the require of water quality in the reverse osmosis system. These results showed that Fe(OH) 3 could effectively be formed by adding FeCl 3 and realize the efficient silicon removal from the reverse osmosis brine wastewater, even when chloride ion (Cl - ), sulfate anion ( S O 4 2 - ) and nitrate ion ( N O 3 - ) were present. Moreover, the adsorption thermodynamics, kinetics and isotherms during the process of the adsorption of silicon from the wastewater by Fe(OH) 3 were studied. The calculated adsorption capacity of silicon could reach 612.74 mg·g −1 , which was much larger than those of reported adsorbents. These results showed that the silicon removal process was spontaneously exothermic and mainly controlled by the physical adsorption and the monomolecular layer adsorption. This simple and cost-effective method could be used for the silicon removal from different kinds of Si-containing wastewater.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-14
·
IF 15.7
Song Wanqing,Wen Zhenzhuang,Wang Xin,Qian Kunyan,Zhang Tao,Wang Haozhi,Ding Jia,Hu Wenbin
Sodium | |sulfur batteries hold great promise for grid-scale energy storage, yet their performance is hindered by the shuttling and sluggish redox of sulfur species. Herein, we report a strategic design of sulfur hosts modified with coordinatively unsaturated iron single-atom (Fe‒N x ) for sodium | |sulfur batteries. Utilizing theoretical calculations, geometric descriptor γ ( l Na‒S / l Fe‒N ) and electronic descriptor φ ( e g / t 2g ) simultaneously correlated with the unsaturation degree of Fe‒N x site are proposed. A negative correlation between γ and the adsorption strength of sodium polysulfides, along with a positive correlation between φ and the decomposition capability of Na 2 S are established. The Fe‒N 1 sites, with the minimum γ and maximum φ values, are identified as the optimal functional species for optimizing polysulfides behaviors. Sodium | |sulfur batteries utilizing Fe‒N 1 /S positive electrodes deliver improved sulfur utilization (81.4% at 167.5 mA g ‒1 ), sustained rate performance (1003.0 mAh g ‒1 at 1675 mA g ‒1 ), and stable cycling (83.5% retention over 450 cycles at 3350 mA g ‒1 ). Moreover, Fe‒N 1 /S positive electrodes enable sodium | |sulfur pouch cells to deliver a sulfur utilization of 77.4% (1296.9 mAh g ‒1 ) at 0.1 A g ‒1 . Our work offers a strategy for designing high-activity, fast redox sulfur positive electrodes and validates the practical potential of sodium | |sulfur batteries.
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PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2025
·
IF 6.6
Hai Qin,Xiaoting Liao,Qun Tang,Bin Huang,Zhiming Zou,Lin Xu,Heping Li
Developing biopolymer-based smart active packaging materials with antimicrobial and colorimetric ammonia-sensitive function has become an emerging strategy to ensure food safety. To address the shortcomings of biopolymer film material with single function, weak mechanical and barrier performances, innovative corn starch (CS)-based smart active packaging film with antimicrobial and colorimetric ammonia-sensitive function was manufactured by constructing novel nano Fe-HIA complex as functional filler. Results revealed that the manufactured CS/Fe-HIA films had uniform and intact morphologies resulting from robust hydrogen bonds between CS and Fe-HIA, and displayed significantly improved performances dependent on Fe-HIA content. Specially, the CS-based smart active film with relatively high Fe-HIA content (5 wt%) was much more sensitive to ammonia, showing noticeable color transition from brown to yellow. The well distributed Fe-HIA significantly promoted hydrophobicity (96.0°), water barrier, thermal stability, mechanical strength (6.8 MPa), and UV-blocking (100 %) performances of the film. Furthermore, CS/Fe-HIA films possessed good antibacterial activity (over 90 %), long-term color stability, biocompatibility, and biodegradability. In freshness monitoring trial, CS/Fe-HIA films were proved to be effective in real-time and visual monitoring of prawn spoilage. This study presents a new strategy for creating advanced biopolymer-based antimicrobial and colorimetric ammonia-sensitive film, boosting related application in smart active food packaging.
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