ACS Applied Nano Materials
·
2025
·
IF 5.5
Longxin Wang,Yishan Wang,Dongdong Liu,Yao Wang,Xuji Zhang,Guangwu Wen,Xueqian Zhang,Xiaoxiao Huang
The application of heterostructures and complex morphology has been favored by researchers of electromagnetic wave-absorbing materials. Herein, Fe3O4/Fe2O3/C composites with carbon-coated octahedral structures were prepared and obtained using a polymer self-assembly-guided nonhomogeneous structure engineering strategy to form hierarchical polyhedral structures (200–400 nm in size). The electrostatic attraction of anionic polyacrylamide (APAM) is used to chelate Fe3+. Due to the synergistic effect of intermolecular forces, APAM can be used as a “bridge” to connect multiple micellar particles, and this bridging and entanglement effect facilitates the formation of octahedral Fe3O4/Fe2O3. Compared with nanoparticles, the octahedral structure easily forms a conductive network, and the presence of sharp corners can effectively promote the concentration of charge, promote polarization loss, and extend the reflection and scattering path. Through the high-temperature reduction of APAM, the conversion of part of Fe2O3 to Fe3O4 is realized, which effectively improves the electromagnetic parameters and thus optimizes the impedance matching. Meanwhile, the synergistic effect between the magnetic loss (ferromagnetic resonance) of Fe3O4 and the dielectric loss (interfacial polarization, dipole polarization, and conduction loss) of Fe3O4/Fe2O3/C enhances the absorption of electromagnetic waves. Unsurprisingly, the synthesized Fe3O4/Fe2O3/C composites exhibit excellent EMW absorption performance, with a reflection loss of up to −34.7 dB at 30% paraffin filler ratio and an effective absorption bandwidth (EAB) of 8.64 GHz at 1–3 mm.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 10
·4255-4266
·
IF 4.4
Nie Hongqi,Yang Xu-Hao,Yang Su-Lan,Fershtat Leonid,Yan Qi-Long
The nano-sized metal oxides (MOs) as combustion catalysts have been widely employed in solid rocket propellants, but the functionality of these materials is greatly restricted owing to their agglomeration. The catalytic activity of MOs on nanoscale was found to be significantly improved by the incorporation of MOs with carbon nanomaterials, which normally act as carriers allowing for well-distribution of MOs. In this paper, the CuO and Fe 2 O 3 nanoparticles were produced by hydrothermal method and the CuO@C and Fe 2 O 3 @C nanocomposites with a uniform structure have been fabricated by an in-situ growth of corresponding MOs on the porous activated carbon (pAC). The morphology of the prepared MOs nanoparticles and resultant pAC carried ones were characterized using scanning electron microscope. It has been shown that the CuO and Fe 2 O 3 nanoparticles are tightly adhered and dispersed on the surface of pAC. Their catalytic effects on the thermal decomposition of hexogen (RDX) were analyzed using thermal analysis techniques. Results indicate that the thermal decomposition of RDX was considerably promoted in the presence of these catalysts, where the CuO@C and Fe 2 O 3 @C were found to be capable of lowering the T p for RDX by 14.8 °C and 12.4 °C, respectively. In addition, the decomposition kinetics of RDX in the presence of these catalysts have been evaluated with the DTG and DSC experimental data, and results show that the CuO@C and Fe 2 O 3 @C were able to reduce the E a of RDX decomposition by 39.8 kJ mol −1 and 50.7 kJ mol −1 , which is suggestive of an enhanced decomposition process for RDX by addition of carbon-loaded catalysts. The TG-FTIR analysis indicates that, in the presence of CuO@C and Fe 2 O 3 @C, the gaseous products are dominated by N 2 O in RDX decomposition.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Yu Zhang,Qing Li,Jiwei Liu,Wenbin You,Fang Fang,Min Wang,Renchao Che
The Fe2O3@C@MnO2@C (FCMC) nanocomposites containing spindle-like Fe2O3 as a core and MnO2 nanoflakes as a sandwiched shell and double carbon layers have been successfully prepared by a facile method. As anode materials of lithium ion batteries (LIBs), the cycling stability, rate performance, and conductivity of the prepared FCMC nanocomposites are far beyond those of the carbon-free Fe2O3@MnO2 (FM) nanocomposites. The hierarchical structure with double layers of carbon effectively enhances the ion conductivity and electrochemical performance of transitional metal oxides, indicating that carbon in FCMC played an important role during lithium ion storage. The initial discharge/charge capacity of the FCMC electrode reaches as high as 1240.2/1215.9 mAh g–1, and the discharge capacity is over 1000 mAh g–1 at 500 mA g–1 after 50 cycles. Additionally, the unique hierarchical structural characteristic with double layers of green carbon with a high degree of graphitization makes FCMC an excellent catalyst in removing methylene blue (MB) dye from solution with H2O2 under a slight heating with the degradation time as short as 10 min. Our work presents a new perspective on carbon modified multilayer core–shell oxide structure, which can be applied to many fields such as energy storage and catalyst.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Catalysis
·
2018
·
IF 11.384
Yizhou Wu,Jesse Ward-Bond,Donglin Li,Shaohua Zhang,Jiafu Shi,Zhongyi Jiang
Graphitic carbon nitride (g-C3N4) is an emergent metal-free photocatalyst because of its band position, natural abundance, and facile preparation. Synergetic intensification of charge generation and charge transfer of g-C3N4 to increase solar-to-chemical efficiency remains a hot yet challenging issue. Herein, a nanoshell with two moieties of α-Fe2O3 and carbon (C) is in situ formed on the surface of a g-C3N4 core through calcination of Fe3+/polyphenol-coated melamine, thus acquiring g-C3N4@α-Fe2O3/C core@shell photocatalysts. The α-Fe2O3 moiety acts as an additional photosensitizer, offering more photogenerated electrons, whereas the C moiety bridges a “highway” to facilitate the electron transfer either from α-Fe2O3 moiety to g-C3N4 or from g-C3N4 to C moiety. By tuning the proportion of these two moieties in the nanoshell, a photocurrent density of 3.26 times higher than pristine g-C3N4 is obtained. When utilized for photocatalytic regeneration of reduced nicotinamide adenine dinucleotide (NADH, a dominant cofactor in biohydrogenation reaction), g-C3N4@α-Fe2O3/C exhibits an equilibrium NADH yield of 76.3% with an initial reaction rate (r) of 7.7 mmol h–1 g–1, among the highest r for photocatalytic NADH regeneration ever reported. Manipulating the coupling between charge generation and charge transfer may offer a facile, generic strategy to improve the catalytic efficiency of a broad range of photocatalysts other than g-C3N4.
研究领域:
材料科学
·
光化学
·
催化
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Ying Wei,Chen-Ming Zhou,Xiao-Man Cao,Zhi-Jia Sun,Qiong Wu,Da-Liang Liu,Zheng Xing,Qing-Guo Zhang
The use of hematite (α-Fe 2 O 3 ) as anode materials remains challenging because α-Fe 2 O 3 with poor conductivity and sluggish ionic transportation in the oxide lattice during energy storage. Herein, the hierarchically structured hollow acanthospheres (Fe 2 O 3 @C-HASs), for the first time, were prepared on carbon cloth (CC) by facile solvothermal method and self-sacrifice template method. Benefiting from its unique hierarchical hollow acanthospheres structures, a large specific surface area, transition-metal oxides and graphitized carbon layer, the hierarchically structured CC/Fe 2 O 3 @C-HASs electrode delivers an outstanding areal capacitance of 1712.1 mF cm −2 at 5 mA cm −2 , which are far superior to CC/Fe 2 O 3 -HASs (777.8 mF cm −2 at 5 mA cm −2 ). A 1.7 V flexible solid-state asymmetric supercapacitor (ASC) was successfully assembled with CC/Fe 2 O 3 @C-HASs as the anode, NiO on carbon cloth (CC/NiO) as the cathode, exhibiting a maximum volumetric energy density of 2.87 mWh cm −3 at a volumetric power density of 40.20 mW cm −3 , and excellent cycling stability (82.1% after 10,000 cycles). In this work, CC/Fe 2 O 3 @C-HASs can be used as an ideal anode material, which can provide a reference for the rational design and preparation of electrode material to asymmetric supercapacitors.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Chenglong Li,Shuang Wang,Yinghe Cui,Xiaodong Wang,Zhipeng Yong,Dan Liang,Yue Chi,Zhe Wang
The restacking of the MXene film limits its development to the high energy density of flexible supercapacitors. In order to promote the application of MXene films in portable electronic devices and miniaturized energy storage devices, it is necessary to increase the area capacitance of MXene films for the pursuit of high energy density. The introduction of α-Fe2O3–C–MoS2-PEDOT:PSS (FMP) into MXene significantly increases the area capacitance. Considering the large number of active sites on the surface of MXene and its excellent hydrophilicity, FMP can be well-compounded with MXene, and the accumulation and loss of FMP can be prevented. Meanwhile, it can reduce the performance degradation caused by the accumulation of MXene’s own structure and greatly increase its capacitance value. It is worth mentioning that the MXene/FMP/MXene (M/FMP/M) sandwich structure on the carbon cloth is reasonably designed to show excellent performance. Therefore, the best M/FMP/M electrode could attain a breakthrough in the area capacitance (2700 mF cm–2 and 541 F g–1). At the same time, the electrode maintains a fine rate capability and fabulous flexibility. In addition, the symmetrical supercapacitors also show a significant energy density of 371 μW h cm–2 (12.36 W h·kg–1), making this sandwich structure electrode a promising candidate for high-energy-density devices.
研究领域:
材料科学
·
储能技术
·
纳米科技
·
电化学
·
柔性电子学
✓ 已验证
DOI
高影响因子
Journal of Magnesium and Alloys
·
2026
·
IF 15.8
Bogu Liu,Shuo Liang,Xingqing Duan,Yawei Li,Haixiang Huang,Tingting Xu,Bao Zhang,Jianguang Yuan,Xiaohong Chen,Ying Wu
High entropy alloys (HEAs) have garnered considerable interest in catalysis owing to their unique characteristics, while transition metal oxides remain widely studied as classical catalysts. Herein, a novel core-shell FeCoNiCrCu/Fe 2 O 3 @C catalyst coated by a micro- and nano-scale amorphous carbon layer was prepared via a relatively facile synthesis method involving complexing multiple metal cations in organic solvents followed by calcination. Compared with MgH 2 , the initial hydrogen desorption temperature of MgH 2 with the FeCoNiCrCu/Fe 2 O 3 @C catalyst decreases significantly from 290 °C to 172 °C, and the peak temperature is reduced to 268 °C. Furthermore, the catalyzed MgH 2 enables hydrogen absorption even at room temperature under 3 MPa. It also demonstrates excellent cyclability, maintaining over 90% of its initial capacity after 50 cycles, along with progressively enhanced dehydrogenation kinetics. The excellent hydrogen storage performance of the catalyzed MgH 2 is contributed to the synergistic interplay of catalytic components collectively, including the “hydrogen diffusion channel” effect of the in-situ generated Co 3 Fe 7 , the “hydrogen pump effect” exhibited by the reversible catalytic phase pair Mg 2 Ni(Cu)/Mg 2 Ni(Cu)H 4 , as well as the multiphase interface composed of HEAs FeCoNiCrCu, Co 3 Fe 7 and MgH 2 . The amorphous carbon prevents particle agglomeration. This study demonstrates that the HEAs can exhibit significant catalytic effects through rational design.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Xiaowei Ma,Lin Tan
Metal–organic frameworks (MOFs)-derived compounds exhibit tremendous potential for applications in the field of microwave absorption, attributed to their unique structural characteristics, high specific surface area, and tunable magnetic and dielectric properties. However, their practical application in the microwave absorption field is limited by poor impedance matching. To address this issue, we successfully synthesized a composite microwave-absorbing material, labeled as Fe/Fe2O3/C/N,SGPE, by introducing heteroatom (N and S) codoped graphene (labeled as N,S-GPE) into an Fe/Fe2O3/C MOF derivative and employing a solvothermal method followed by subsequent pyrolysis. The introduction of N and S codoped graphene introduces defects and disordered structures, thereby enhancing interface and dipolar polarization processes, which in turn improve the dielectric properties and optimize impedance matching. The experimental results demonstrate that when the addition amount of N,S-GPE is 0.15 g, the material exhibits a maximum reflection loss of -62.8 dB at 7.6 GHz with a thickness of 3.09 mm, capable of absorbing over 99.9999% of microwaves. Consequently, this composite stands out as a promising candidate for high-efficiency microwave absorbers.
研究领域:
微波吸收材料
·
纳米复合材料
·
材料科学
·
电磁干扰屏蔽
·
碳基材料
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Xiaoqian Xu,Yuanxin Wan,Jingwen Liu,Yaojun Chen,Linling Li,Xiaoliang Wang,Gi Xue,Dongshan Zhou
To meet the requirements for the quick charge for the hybrid electric vehicles (HEVs) or plug-in hybrid electric vehicles (PHEVs), better rate capability is urgently needed for the lithium ion batteries (LIBs). Here in our work, a new anode with excellent rate capability is developed. In this anode, nanoporous iron oxide nanoparticles coated with carbon (designated as Fe 2 O 3 @C NPs) are homogeneous distributed in carbon nanofibers (CNFs), which can be designated as Fe 2 O 3 @C CNFs. The CNF constrains the nanoporous Fe 2 O 3 @C NPs along the longitudinal direction and the fibers are cross-linked, establishing a three dimensional (3D) stable electric conductive network. The nanoporous Fe 2 O 3 @C NPs exposed on the surface of CNFs provide more active sites for electrode reactions. The thin carbon shell around the Fe 2 O 3 NPs gives the additional protection and improves the conductive connection between the nanofibers, leading to an integral conductive network which links all the Fe 2 O 3 @C NPs. The Fe 2 O 3 @C CNFs structure exhibits good capacity retention and excellent rate capacity at high current density.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）