ChemElectroChem
·
2021
·Vol. 8
·期 24
·4817-4825
·
IF 4.59
Jie Zhu,Qian Zhang,Sudong Yang,Lin Chen,Peng Zhao,Qiang Yan
Graphical Flexibility approach : A facile two-step process for fabricating a distinctive Fe/Fe 3 O 4 composite deposited on carbon fabric as a negative electrode for a flexible nickel-iron battery is reported. The assembled battery exhibited a high voluminal capacity with a stable operating voltage up to 1.7 V, long-term cyclic stability as well as good mechanical stability and flexibility. The nickel-iron (Ni−Fe) battery is a competitive alternative for electrochemical energy storage, owning to its low cost, high safety, and strong auto-adaptive ability. However, the self-discharge and passivation of the negative electrode are the two main issues. In this work, a rock-like Fe/Fe 3 O 4 composite is synthesized and deposited on carbon fabric (Fe/Fe 3 O 4 @CF) by facile electrodeposition and annealing technologies to serve as a binder-free anode, which exhibits a large areal capacity of 0.466 mAh cm −2 and long-term cycling durability. Moreover, the flexible device is assembled by employing Fe/Fe 3 O 4 @CF-750 as anode and Ni(OH) 2 @CF as cathode. The above battery displays an enhanced operating voltage up to 1.7 V, impressive mechanical flexibility, outstanding cycling stability (86.2 % retention of initial value over 6000 charge-discharge cycles), and satisfactory voluminal capacity of 1.33 mAh cm −3 , indicating its potential application for energy supply systems of modern wearable electronics.
研究领域:
材料科学
·
电化学
·
能源存储
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Xianlin Zhan,Mengqiu Huang,Bicheng Li,Ge Ma,Wenbin You,Yun Tang,Lei Wang,Renchao Che
Rational design of magnetic-dielectric composites proves essential for developing broadband electromagnetic (EM) wave absorbers. However, the non-uniform distribution of magnetic particles within the carbon matrix significantly reduces magnetic coupling efficiency. To overcome this, we employ a confinement strategy to fabricate Fe/Fe 3 O 4 @C composite aerogels that feature a multiscale magnetoelectric coupling network. The confined-growth Fe/Fe 3 O 4 @C nanoscale magnetic‑carbon units construct high-density heterogeneous interfaces, enhancing charge accumulation and interfacial polarization, thereby further strengthening energy dissipation. Meanwhile, under the confinement of the aerogel framework, metal-organic frameworks (MOFs) derived materials in the 2D magnetized micro-flakes maintain their octahedral morphology and collectively establish a continuous, stable nano-micro-macro magnetic coupling network. Moreover, the theoretical investigations including density functional theory calculations, COMSOL Multiphysics simulation, and radar cross-section simulation systematically elucidate the structure-property relationships governing dielectric behavior, magnetic properties, and absorption bandwidth. Notably, the optimized Fe/Fe 3 O 4 @C exhibits remarkable EM absorption performance, achieving a reflection loss of −48.44 dB and a broad bandwidth of 6.88 GHz at 2.15 mm thickness, fully covering the Ku band. Moreover, constructing the periodic structure enables an ultrabroadband absorption of 11.36 GHz at a thickness of only 4.15 mm. This study provides an idea for fabricating multifunctional EM wave absorbers with lightweight, broadband absorption, hydrophobic, thermal insulation, and infrared stealth properties.
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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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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Shiyu Wu,Yao Zhang,Peng Liu,Xiaolei Zhang,Xincheng Cao,Junming Xu
The development of non-noble metal catalysts for the selective hydrogenation of long-chain fatty acids into value-added chemicals remains a significant challenge. Here, an efficient Fe@Fe 3 O 4 catalyst enriched with oxygen vacancies and weak Lewis acid sites was obtained by tuning the reduction temperature. The catalyst enabled complete conversion of stearic acid with a 97.3 % yield of octadecanol under mild conditions, and maintained high activity after 19 cycles. Moreover, when stearic acid was completely converted to alkanes, the yield of octadecane via the hydrodeoxygenation pathway (97.4 %) was markedly higher than that of heptadecane via the decarbonylation pathway (2.6 %), indicating the catalyst's excellent carbon atom utilization efficiency. Mechanistic studies revealed that metallic Fe efficiently dissociates H 2 to generate active hydrogen, while oxygen vacancies and weak Lewis acid sites in Fe 3 O 4 promote carbonyl adsorption and activation. In addition, weak Lewis acid sites interact with the carbonyl oxygen to moderately polarize the C O bond, thereby suppressing undesired C C cleavage. These synergistic effects account for the catalyst's high activity and selectivity, providing guidance for the design of advanced non-noble metal catalysts for fatty acid hydrogenation.
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DOI
高影响因子
Environmental Technology & Innovation
·
2026
·
IF 7.3
Junjie Su,Qi Yang,Yanlun Chu
The remediation of water bodies co-contaminated with heavy metal and chlorinated organic pollutants presented significant technical challenges. In this work, a Ni/Fe@Fe 3 O 4 and an ultrasound-assisted Ni/Fe@Fe 3 O 4 co-removal reaction system were established for the simultaneous removal of co-existing pollutants carbon tetrachloride (CT) and hexavalent chromium (Cr(VI)). Results demonstrated that CT promoted Cr(VI) removal, while Cr(III)/Fe(III) oxides/hydroxides (Cr(VI) reduction products) formed on the surface of Ni/Fe@Fe 3 O 4 effectively inhibited the CT degradation. The ultrasound significantly enhanced the Ni/Fe@Fe 3 O 4 co-removal reaction system, accelerating complete Cr(VI) removal and boosting CT removal efficiency from 69.24% to 95.62%. Ultrasound treatment improved the long-term reactivity of Ni/Fe@Fe 3 O 4 , achieving consistent 100% removal of Cr(VI) with only a marginal 5.56% decrease in CT removal efficiency over five cycles. Ultrasound and Ni/Fe@Fe 3 O 4 had a significant synergistic effect on the removal of pollutants, with a synergy index of 2.06. The enhancement mechanism of ultrasound on co-contamination removal by Ni/Fe@Fe 3 O 4 included: (1) improving nanocomposite dispersibility and optimizing the reaction interface; (2) removing the passivation layer on the surface of Ni/Fe@Fe 3 O 4 to expose more active sites.
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DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Junjie Su,Han Hao,Jingran Li,Zhilin Yang,Qi Yang
Nanometer zero-valent iron (nZVI), Fe 2+ and H 2 were potential electron donors for CT removal by nZVI. However, the action of these electron donors in CT reduction was often ambiguous. In this study, the actual catalytic activity of Ni 4 /Fe@Fe 3 O 4 under common ions and humic acid (HA) was investigated. The results showed that Na + and K + had no effect on CT removal, Cl ‐ , SO 4 2 ‐ and low concentration of Mg 2+ was beneficial to CT removal, while NO 3 ‐ , HCO 3 ‐ , Ca 2+ and HA exhibited the negative effects. According to the analysis results of gas chromatography (GC) and ion chromatography (IC), a possible dechlorination pathway of CT was proposed. Furthermore, the action mechanism of nZVI, Ni 0 and magnetite (Fe 3 O 4 ) on CT removal were explored. Among the three possible nZVI reducing mechanism, the use of H 2 by Ni 0 for the hydrodechlorination was dominant, while the direct reduction of nZVI was secondary. Fe 2+ , the product of nZVI corrosion, contributed little to CT degradation and required longer reaction time. Ni 0 could not only utilize H 2 but also form galvanic cells with nZVI to accelerate CT dechlorination. In addition, the support Fe 3 O 4 significantly improved the dispersion of Ni/Fe nanoparticles and its corrosion product Fe 2+ also promoted the CT removal. These findings were significant for comprehending the mechanisms of bimetallic nanocomposites in reducing CT, and might guide to the development of nZVI based technology for repairing polluted water or soil with organochlorine pollutants.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Jun Hu,Hao Chen,Huiyu Dong,Lulu Zhu,Zhimin Qiang,Jianming Yu
ABSTRACT Cast iron pipes are commonly applied in drinking water distribution systems (DWDSs); peroxymonosulfate (PMS) is a promising alternative for drinking water disinfection; organic micropollutants is still present in drinking water after waterworks’ treatment. However, iron corrosion products may affect the reactions between a disinfectant and organic micropollutants. The study investigated the transformation of iopamidol (IPM) and atrazine (ATZ) by PMS under the catalysis of a composite iron corrosion product (Fe/Fe 3 O 4 ). The pseudo-first-order rate constants ( k ) for the degradation of IPM and ATZ were 1.47 and 1.03 min –1 , respectively. Electron paramagnetic resonance (EPR) experiments indicated that PMS was effectively activated to yield sulfate radical (SO 4 •− ) and hydroxyl radical (HO • ), mainly via the reduction by Fe component, dissolved Fe 2+ and generated F eocta 2 + . SO 4 •− contributed more than HO • to the degradation of IPM and ATZ, and the radical yield achieved 0.97 mol/mol. The k values reached maximum with Fe/Fe 3 O 4 and PMS doses of 2.5 g L –1 and 25 mg L –1 , respectively. The optimum mass fraction of Fe 3 O 4 in Fe/Fe 3 O 4 (MF mag ) and pH were 10% and 7.0, respectively. The k values increased with increasing temperature, while decreased in the presence of water matrix. Most of the iodine released from IPM was oxidized to IO 3 − , and NH 4 + was the dominant species of nitrogen released from ATZ. The identification of transformation intermediates showed that the radical chain reactions of IPM was mainly initiated from single electron transfer and radical adduct formation, while those of ATZ was primarily initiated from hydrogen atom abstraction and radical adduct formation.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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