JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2025
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IF 3
Qi Li,Zhangqiao Zhou,Yan Nie,Lu Yang,Yu Wang,Jinsong Chen,Xian Wang
The preparation of soft magnetic composites requires effective surface modification of alloy powder to enhance insulating properties and achieve dense, uniform coating layers. Firstly, the gas-atomized Fe-Ni-Mo powder was surface modified using the atomic layer deposition method, forming a uniform and dense Al 2 O 3 insulating layer. The secondary surface modification of organic polymers further improves the properties of soft magnetic composites. This study systematically evaluates the effects of the primary and secondary surface modification on the properties of powder particles and soft magnetic composites. The primary modification generates an extremely thin insulating layer of approximately 2.5 nm, which increases the particle resistivity by 9 orders of magnitude. The permeability frequency stability of the soft magnetic composites increased from 11.3 % to 96.5 %, resulting in significant core loss reduction. The secondary modification effectively enhances the formability of soft magnetic composites. Optimal permeability of 242.7 at 1 kHz is achieved, maintaining 95.2 % frequency stability up to 1 MHz, while core loss remains below 570 mW cm −3 under 100 kHz/100 mT conditions. The surface treatment method in this work can provide a reference for the surface insulation modification of soft magnetic composites.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Fuqin Zheng,Ziwei Zhang,Dong Xiang,Ping Li,Cheng Du,Zhihua Zhuang,Xiaokun Li,Wei Chen
Electrochemical water-splitting is an ideal strategy to produce the promising substitutable energy source, hydrogen (H 2 ). However, the sluggish kinetics of electrochemical oxygen evolution reaction (OER) and the prohibitive cost, low reserves and easy oxidation of noble metal-based electrocatalysts force researchers to explore efficient and low-cost electrocatalysts . Bimetal nanostructred materials are proved to have enhanced OER catalytic performances. In this study, a series of bimetallic metal-organic frameworks (Fe/Ni-MOFs) are prepared by a solvothermal method . The prepared MOFs present abundant unsaturated metal active sites for OER. The optimized Fe/Ni bimetal-MOF has low overpotentials of 236 mV at 10 mA cm −2 and 284 mV at 100 mA cm −2 for OER. In addition, in comparison with most of the previously reported OER electrocatalysts, the present MOF shows a lower Tafel slope of 49 mV dec −1 . Besides, the MOF catalyst exhibits high electrochemical stability and the OER activity shows a negligible change after stability test for 15 h and 10,000 voltammetric cycles. Meanwhile, the Fe-doped Ni-MOFs show faster catalytic kinetics and higher conductivity than the monometallic Ni-MOF. This work paves a way to exploit bi- or multi-metallic MOFs with high conductivities and electrocatalytic performances for electrochemical energy conversion .
研究领域:
材料科学
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电化学
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能源转换
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2023
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IF 5.9
Kang Ji,Junpeng Wang,Ping Yang
Modulation of oxygen intermediates in the oxygen evolution reaction (OER) tends to be an effective method for intensifying OER activity. In this paper, NiCo nanolayered double hydroxide (NC-LDH)-decorated FeNi bimetallic metal–organic framework (FN-MIL) heterostructures were constructed for enhanced OER performance. Various characteristics including Raman and Fourier-transform infrared spectra, X-ray diffraction patterns, scanning and transmission electron microscopy images, and X-ray photoelectron spectroscopy spectra help to explore the composition and microstructure. The band gap of samples was discussed using Mott–Schottky curves and Tauc plots to analyze the interfacial electron transfer driven by the energy level difference, resulting in the formation of electron-rich and electron-deficient regions at the interface and realizing the directed modulation of oxygen intermediates. The as-prepared composite catalyst revealed excellent OER performance, long-term stability, a high faradic efficiency of 97.8%, and a low potential of 244 mV at 10 mA cm–2 (without iR-compensation). Interestingly, the catalyst maintained high OER activity in seawater containing 1 M KOH due to its favorable resistance to chloride ions, suggesting an appealing prospect in practical application.
研究领域:
材料科学
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电化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Sanli Tang,Lizhuang Dou,Fei Dai,Zihan Wan,Zhongrui Gai,Ying Pan,Qibin Liu,Hongguang Jin
Bimetallic oxygen carriers hold great promise for CH 4 chemical looping reforming at 500–700 °C. Current research focuses on material optimization of lab-scale powders. However, industrial use requires mass production, shaping, and calcination—causing performance shifts from lab samples. Therefore, this study explored how beads-shaping and calcination affect a 10-kg-scale Fe–Ni oxygen carrier. Compared to powder, spheronized beads increased H 2 generation in reduction stage. Calcination at 1300 °C produced 2.5-time stronger beads than 1200 °C. Both calcined beads had 10-15 percentage points lower CH 4 conversion at 550–600 °C, recovering to >92 % at 650 °C. The calcined beads produced 0.4–0.6 more H 2 from per CH 4 , though requiring more oxygen carrier input. Microscopical reasons to performance change were the shifts in reaction pathway and the forming of Fe–Ni–Al spinel. Macroscopical reasons were the oxygen release influenced by topology change. This work identifies key shaping and calcination parameters critical for oxygen carrier commercialization.
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高影响因子
DALTON TRANSACTIONS
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2023
·Vol. 52
·期 36
·12819-12831
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IF 4
Hao Tan,Chen Li,Zhaodong Nan
Artificial nanozymes have been receiving considerable interest for their outstanding performance and wide application. However, their low activity results in a high concentration of substrates, costs, and environmental pollution. To enhance nanozymic activity, a composite, FexNi1−xS2/hollow carbon spheres (FexNi1−xS2/SC), was facilely synthesized by a solvothermal method. The response surface methodology (RSM) was used to optimize the Ni content in FexNi1−xS2/SC and the experimental conditions, where Fe0.75Ni0.25S2/SC exhibited the highest activity. The Km (Michaelis–Menten's constant) values of Fe0.75Ni0.25S2/SC are 0.025 and 0.021 mM with H2O2 and oxidized 3,3′,5,5′-tetramethylbenzidine (TMB) as the substrates, respectively, which are 148 times and 20.5 times lower than those with HRP, 1.88 and 7.19 times lower than those of FeS2/SC, and 1.88 and 10.52 times lower than those of Fe0.8Ni0.2S2, meaning a strong affinity of Fe0.75Ni0.25S2/SC for the substrate. The catalytic efficiency (Kcat/Km) of Fe0.75Ni0.25S2/SC was 5.4 (H2O2) and 27.4 times (TMB), and 9.7 (H2O2) and 66.2 times (TMB) higher than those of FeS2/SC and Fe0.8Ni0.2S2, respectively. The effects of the synergistic interaction between Fe and Ni, the S–C bond formation, and the hollow carbon spheres on the activity were studied. A nanozymic mechanism was proposed. Fe0.75Ni0.25S2/SC could be used to detect cysteine (Cys) at room temperature in 1 min with a detection limit (LOD) of 0.049 μM.
研究领域:
生物化学
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材料科学
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分析化学
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DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Ting Zhang,Juan Huang,Yongbin Yang,Chunmei Li,Jianfeng Tang,Qing Li,Hua Lin
The development of bifunctional non-noble metal electrocatalysts with high activity and stability remains a significant challenge. In this work, Fe@Ni aerogels with core-shell structure were synthesized by sol-gel method. The unique network-like architecture and amorphous core-shell structures of Fe@Ni aerogels provide abundant defects and unsaturated sites. Moreover, the tunable surface electronic structure enhances the availability of active catalytic sites, resulting in outstanding catalytic performance for both the oxygen evolution reaction (OER) and methanol oxidation reaction (MOR). For OER, the FeNi 2 aerogel requires only an overpotential of 215 mV to achieve a current density of 10 mA cm −2 , along with a low Tafel slope of 31.7 mV dec −1 and excellent stability. For MOR, its specific and mass activities were as high as 213.6 mA cm −2 and 106.8 A g −1 , respectively. In addition, this study also elucidated the mechanism of the excellent bifunctional catalytic activity of Fe@Ni core-shell aerogels, which provides a new idea for the development of other high-activity non-precious metal electrocatalysts.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
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IF 4.464
Guohao Chen,Lin Gao,Lulu Zhang,Xuelin Yang
Transition metal phosphates (TMPs) are considered as promising anode materials for sodium-ion batteries (SIBs) due to their high theoretical capacity (up to 1000 mAh g −1 ) and low cost. However, the poor electrochemical reaction kinetics and large volume expansion of TMPs are not conducive to practical applications in SIBs. In view of this, a kind of self-supported iron nickel phosphide (Fe-Ni-P) composite nanosheet arrays are obtained by reasonable hydrothermal reaction and phosphidation process. The nanosheet arrays construction can significantly release the mechanical strain and promote electrochemical reaction kinetics. Furthermore, the volume expansion can be largely alleviated by the synergistic effect of Fe 2 P and Ni 2 P. Benefiting from the unique design, the robust Fe-Ni-P arrays manifest remarkable Na + storage capability. The Fe-Ni-P nanosheet arrays exhibit a large discharge capacity of 300.9 mAh g −1 after 100 cycles at 0.1 A g −1 . And there is a reversible capacity of 201.7 mAh g −1 can be maintained without obvious capacity loss after 200 cycles at 0.5 A g −1 in SIBs.
研究领域:
材料科学
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电化学
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DOI
高影响因子
ACS Nano
·
2019
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IF 13.903
Hao Ren,Xiaoli Sun,Chengfeng Du,Jin Zhao,Daobin Liu,Wei Fang,Sonal Kumar,Rodney Chua,Shize Meng,Pinit Kidkhunthod,Li Song,Shuiqing Li,Srinivasan Madhavi,Qingyu Yan
Electrocatalysts are one of the most important parts for oxygen evolution reaction (OER) to overcome the sluggish kinetics. Herein, amorphous Fe–Ni–P–B–O (FNPBO) nanocages as efficient OER catalysts are synthesized by a simple low-cost and scalable method at room temperature. The samples are chemically stable, in clear contrast to reported unstable or even pyrophoric boride samples. The Fe/Ni ratio of the FNPBO nanocages can be continuously adjusted to optimize the OER catalytic performance. The FNPBO nanocages composed of multicomponent elements can weaken the metal–metal bonds, thus rearranging the electron density around the catalytic metal atom centers and reducing the energy barrier for intermediate formation. Hence the optimized FNPBO (Fe6.4Ni16.1P12.9B4.3O60.2) catalyst shows superior intrinsic electrocatalytic activity for OER. The low overpotential to afford the current density of 10 mA cm–2 (236 mV), the small Tafel slope (39 mV dec–1), and the high specific current density (26.44 mA cm–2) at a given overpotential of 300 mV make a sharp contrast to state-of-the-art RuO2 (327 mV, 136 mV dec–1, and 0.028 mA cm–2, respectively).
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 27
·期 1
·133-143
·
IF 9.3
Hongjiao Chen,Kewei Zhang,Yanzhi Xia,Jian Li,Bin Hui
Coupling the urea oxidation reaction (UOR) and hydrogen evolution reaction (HER) in seawater is desirable to produce sustainable and green hydrogen due to the reduced energy consumption. However, developing high-performance UOR/HER electrocatalysts in seawater instead of pure water remains a great challenge. Herein, (B,P,Co,Fe)-Ni anchored on Paulownia Wood (PW) is proposed to enhance the overall urea-(sea)water splitting performance. The resulting sample only needs a potential of 1.34 V to deliver a large current density of 100 mA cm−2 for alkaline UOR and features a remarkable durability to maintain 100 mA cm−2 for 100 h. The HER and UOR (HER||UOR) coupled system in alkaline seawater-urea electrolyte for producing H2 demonstrated a more significantly reduced electrolyzer voltage of 1.67 V obtained at 100 mA cm−2 in comparison to that of the HER||OER system (1.98 V). The well-aligned micro-channels and nanopores in wood frameworks not only improve the hydrophilicity and aerophobicity of the whole electrode, which is conducive to the penetration of the electrolyte and release of bubbles, but also shorten the transmission distance of ions and intermediates to accelerate the reaction kinetic process. Density functional theory calculations reveal that Co, Fe, P and B co-doping in Ni effectively adjusts the electronic structure, and the adsorption/desorption behavior of the urea reaction intermediates is regulated by the synergistic effect from multiple components, resulting in an excellent catalytic activity in seawater-urea media. This work promotes a better understanding of the surface electronic structure modulation of nanowood via doping strategy and offers great potential in the design of advanced UOR/HER catalysts for hydrogen production and urea wastewater treatment.
研究领域:
材料科学
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电化学
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环境科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Liangyu Tong,Yunpeng Liu,Chenyu Song,Yuqing Zhang,Sanjay S. Latthe,Shanhu Liu,Ruimin Xing
Hollow hybrid heterostructures are regarded to be promising materials as bifunctional electrocatalysts for highly efficient water electrolysis due to their intriguing morphological features and remarkable electrochemical properties . Herein, with FeNi-PBA as both a precursor and morphological template, we demonstrate the rational construct of cost-effective (Fe,Ni)S 2 @MoS 2 /NiS 2 hollow hybrid heterostructures as bifunctional electrocatalysts for alkaline overall water splitting. Microstructural analysis shows that the hybrid is a kind of hierarchical heterostructure composed of MoS 2 /NiS 2 nanosheets/nanoparticles in situ grown on hollow (Fe,Ni)S 2 nanocubes with abundant heterointerfaces, which effectively maximizes the electrochemical active sites to the accessible electrolyte ions , leading to the promoted charge transfer. As expected, the hybrid shows remarkable alkaline electrocatalytic performance, such as hydrogen evolution overpotential of 176 mV and oxygen evolution overpotential of 342 mV at 50 mA cm −2 , as well a cell voltage of 1.65 V at 20 mA cm −2 . Moreover, the stability and durability are greatly enhanced under harsh electrochemical conditions. This study opens a new venue for developing earth-abundant bifunctional electrocatalysts with hollow hybrid heterostructures for alkaline water electrolysis in the future.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Ping-an Yang,Rui Cai,Haibo Ruan,Mingqi Zhao,Xin Huang,Nanqing Zhang,Rui Li,Yuxin Zhang,Jiufei Luo
One-dimensional iron–nickel (Fe–Ni) heterogeneous nanowires with superior electromagnetic wave (EMW) absorption were successfully prepared by a magnetic-field-assisted liquid-phase reduction method. The electromagnetic properties of the absorber were controllably tuned by changing the atomic molar ratio of Fe to Ni. The composite with an Fe:Ni atomic molar ratio of 1:1.5 exhibited the finest EMW absorption characteristics. With a matched thickness of 2.175 mm, the minimum reflection loss (RLmin) at 18 GHz can be as high as 26.106 dB. Also, the majority of the Ku-band is covered by the effective absorption bandwidth (EAB, RL ≤ −10 dB), which is up to 6.08 GHz at 2.6 mm with a filler content of 25%. The excellent absorber performance is due to one’s own rich heterogeneous interface to conciliate the dielectric and magnetic losses. The successful exploration of the one-dimensional heterogeneous structure EMW absorber provides important insights for the future sensible fabrication of absorbers with excellent EMW absorption capability.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Duo Zhang,Ying-Nan Dou,Rui Gao,Xian-Fa Zhang,Hui Zhao,Xiao-Li Cheng,Shan Gao,Ying-Ming Xu,Li-Hua Huo
Rapid, highly sensitive detection of mustard gas is a critical requirement in public safety and national defense. However, achieving highly sensitive, ppb-level detection of mustard gas under low-power conditions remains a significant challenge. Focusing on the typical blister agent simulant 2-chloroethyl ethyl sulfide (2-CEES), a solvothermal method was employed combined with controlled thermal treatment to fabricate an ultrathin porous NiFe 2 O 4 /NiO nanosheets heterostructure sensor derived from an Fe-Ni-MOF in-situ grown on a ceramic tube in this study. This material possesses uniformly distributed intimate heterogeneous interface, a high specific surface area (95.8 m 2 ·g −1 ), and abundant surface active sites, thereby significantly enhancing its adsorption and catalytic oxidation capability toward 2-CEES. At a low operating temperature of 130 °C, the sensor demonstrates a high response of 41.5 toward 10 ppm 2-CEES, a rapid recovery capability of only 84 s, and a low detection limit of 20 ppb, along with excellent selectivity, humidity resistance, reproducibility, and long-term stability. Through systematic characterization including XPS, in-situ DRIFTS, TPD, and DFT calculations, the multi-step catalytic oxidation pathway of 2-CEES on the composite surface is elucidated, along with the mechanism by which the heterostructure enhances gas-sensing performance via band structure modulation, interfacial charge transfer, and the built-in electric field. This study offers both new materials and novel insights for the development of low-power, highly sensitive sensors for trace detection of chemical warfare agents.
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高影响因子
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