Strong Absorption Research Articles

Mechanical Design Guidelines to Inhibit Fracture in Perovskite Solar Cells

Perovskite (PVSK) solar cells offer significant benefits over conventional silicon cells including low‐cost solution processibility, minimal materials usage related to strong photon absorption in thin‐film cell architectures, and a tunable bandgap. However, PVSK films are mechanically fragile, and fracture of PVSK layers and adjacent interfaces are a significant concern during fabrication, encapsulation, and operation. Herein, a thin‐film mechanics fracture analysis tailored for p–i–n and n–i–p PVSK solar cells on both soda lime glass and polyimide substrates fabricated with three PVSK crystallization methods is presented. The role of thermal processing of each cell layer is explored to determine the maximum allowable temperature below which fracture is inhibited. In the analysis, the mechanics basis for processing and materials selection guidelines for preventing fracture in PVSK solar cells is provided.

Synthesis of flower-like covalent organic frameworks for photocatalytic selective oxidation of sulfide

BackgroundCovalent organic frameworks (COFs)-based photocatalysts have garnered significant attention for their potential in highly efficient and selective sulfide oxidation. However, the current synthesis methods of COF-based catalysts involve complex multi-step procedures, and better methods need to be upgraded for synthesis. MethodsIn this study, a flower-like COF-based photocatalyst (f-COFs) was synthesized by one-pot method at room temperature using zinc chloride (ZnCl2) as catalyst. The photocatalytic performance of f-COFs was investigated using methyl phenyl sulfide as substrate. Significant FindingsZinc ions remain on the f-COFs synthesized by this method. EDX analysis and XPS techniques were used to confirm the presence of zinc ions. The presence of zinc ions controls the self-assembly of COFs to form unique flower-like microstructure. Its flower-like microstructure provides a strong light absorption capacity. At the same time, the recombination of charge is inhibited, thus promoting the energy and electron transfer during the photocatalytic reaction. These properties allow reactive oxygen species to be prevalent in the reaction process of f-COFs as a photocatalyst, driving the conversion of methyl phenyl sulfide to sulfoxide within 5 h with excellent performance of 95 % conversion and 99 % selectivity.

InP/PtS2 heterojunctions: Z-scheme photocatalysts with enhanced light absorption for high solar-to-hydrogen conversion efficiency

In this paper, the structure and electronic properties of InP/PtS2 heterojunction as well as the photocatalytic and solar hydrogen production efficiency are studied by first principles. Studies have shown that InP/PtS2 heterojunction is type II band alignment, typical Z heterostructure, has strong light absorption coefficient in the absorption spectrumand, InP/PtS2 heterojunction with an indirect bandgap of 1.97 eV，the band edge positions that meet the energy band prerequisites for water splitting across different pH levels，The band edge positions and light absorption capabilities have been modified through biaxial strain, with tensile strain enhancing the absorption capacity within the visible light spectrum ranging from 450 to 800 nm(nm). The InP/PtS2 heterojunction achieves a solar-to-hydrogen conversion efficiency (ηSTH) of 32.5%, which is higher than that of most heterojunctions. The InP/PtS2 heterojunction is anticipated to emerge as a promising contender for the next generation of photocatalysts.

Preparation of photoreactive cathodes from copper-based metal-organic frameworks and their application in aqueous zinc-ion hybrid supercapacitors

To further enhance the energy density of aqueous zinc-ion hybrid supercapacitors, this paper verifies the feasibility of using copper catecholate (Cu-CAT) a copper-based metal-organic framework (MOF) characterized by strong broadband light absorption, good electrical conductivity, and a large specific surface area as a photoactive material. When used as the photoactive cathode in a Zn//Cu-CAT@CC aqueous zinc-ion hybrid supercapacitor, it can convert and store solar energy in the electrodes. Under sunlight, at a current density of 1 mA cm2, the device's areal capacity reaches 0.162 mAh cm2, an 89.1% increase over the storage capacity without light. This not only opens up new areas for the application of Cu-CAT materials but also offers more possibilities for the development of aqueous zinc-ion hybrid supercapacitors.

Incorporating ReS2 Nanosheet into ZnIn2S4 Nanoflower as Synergistic Z-Scheme Photocatalyst for Highly Effective and Stable Visible-Light-Driven Photocatalytic Hydrogen Evolution and Degradation.

Inspired by natural photosynthesis, the visible-light-driven Z-scheme system is very effective and promising for boosting photocatalytic hydrogen production and pollutant degradation. Here, a synergistic Z-scheme photocatalyst is constructed by coupling ReS2 nanosheet and ZnIn2S4 nanoflower and the experimental evidence for this direct Z-scheme heterostructure is provided by X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, and electron paramagnetic resonance. Consequently, such a unique nanostructure makes this Z-scheme heterostructure exhibit 23.7 times higher photocatalytic hydrogen production than that of ZnIn2S4 nanoflower. Moreover, the ZnIn2S4/ReS2 photocatalyst is also very stable for photocatalytic hydrogen evolution, almost without activity decay even storing for two weeks. Besides, this Z-scheme heterostructure also exhibits superior photocatalytic degradation rates of methylene blue (1.7 × 10-2 min-1) and mitoxantrone (4.2 × 10-3 min-1) than that of ZnIn2S4 photocatalyst. The ultraviolet-visible absorption spectra, transient photocurrent spectra, open-circuit potential measurement, and electrochemical impedance spectroscopy reveal that the superior photocatalytic performance of ZnIn2S4/ReS2 heterostructure is mostly attributed to its broad and strong visible-light absorption, effective separation of charge carrier, and improved redox ability. This work provides a promising nanostructure design of a visible-light-driven Z-scheme heterostructure to simultaneously promote photocatalytic reduction and oxidation activity.

Piezoelectric, Thermoelectric, and Photocatalytic Water Splitting Properties of Janus Arsenic Chalcohalide Monolayers.

In this study, we systematically investigate the piezoelectric, thermoelectric, and photocatalytic properties of novel two-dimensional Janus arsenic chalcohalide monolayers, AsXX' (X = S and Se and X' = Cl, Br, and I) using density functional theory. The positive phonon spectra and ab initio molecular dynamics simulation plots indicate these monolayers to be dynamically and thermally stable. The mechanical stability of these monolayers is confirmed by a nonzero elastic constant (C ij ), Young's modulus (Y 2D), and Poisson ratio (ν). These monolayers exhibit strong out-of-plane piezoelectric coefficients, making them candidate materials for piezoelectric devices. Our calculated results indicate that these monolayers have a low lattice thermal conductivity (κl) and high thermoelectric figure of merit (zT) up to 1.51 at 800 K. These monolayers have an indirect bandgap, high carrier mobility, and strong visible light absorption spectra. Furthermore, the AsSCl, AsSBr, and AsSeI monolayers exhibit appropriate band alignment for water splitting. The calculated value of the corrected solar-to-hydrogen conversion efficiency can reach up to 19%. The nonadiabatic molecular dynamics simulations reveal the prolonged electron-hole recombination rates of 1.52 0.98, and 0.67 ns for AsSCl, AsSBr, and AsSeI monolayers, respectively. Our findings demonstrate these monolayers to be potential candidates in energy-harvesting fields.

Near-infrared light-promoted engineering oxygen vacancy of Fe3Ov-Mo/P nanozyme for sensitive detection of glyphosate

The rapid and sensitive detection of glyphosate herbicide in agricultural products is urgent need. Herein, we develop a photosensitive Fe3Ov-Mo/P nanozyme with defect-rich rough surface by the co-precipitation method. In particular, the Fe3Ov-Mo/P nanozyme with high-percentage oxygen vacancy (OV) defects and rough surface exhibited superior peroxidase (POD)-like activity and kinetics. More intriguingly, Fe3Ov-Mo/P nanozyme with strong optical absorption in near-infrared (NIR) region showed excellent light-promoted POD-like activity. It was found that the defect-rich rough surface is conducive to the adsorption of glyphosate to inhibit the POD-like activity of Fe3Ov-Mo/P. Under near-infrared laser irradiation, the inhibitory effect of glyphosate on the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by Fe3Ov-Mo/P was increased by 2.64 times. A colorimetric platform was developed for the detection of glyphosate with a low detection limit of 0.032 mg L-1 and good selectivity. The method was used to determine the residual glyphosate in coffee, and the recovery efficiency was between 91.20–104.00 %. This work that combines the advantage of defect engineering and NIR provides a strategy for developing high-active nanozyme in pesticide assay.

Effect of Surface Electron Trapping and Small Polaron Formation on the Photocatalytic Efficiency of Copper(I) and Copper(II) Oxides.

Cu2O, CuO, and mixed phase Cu2O/CuO represent promising candidates for photoelectrochemical H2 evolution due to their strong visible light absorption, earth-abundance, and chemical stability. However, the photoelectrochemical efficiency in these materials remains far below the theoretical limit, largely due to poorly understood surface electron dynamics. These dynamics depend on defect states, such as Cu atom vacancies and phase boundaries, which control electron trapping, charge carrier separation, and recombination. In this work, we study the photoinduced electron and hole dynamics at the surface of various Cu oxides using ultrafast extreme ultraviolet reflection-absorption (XUV-RA) spectroscopy. In Cu2O we find that photoexcitation occurs as electron promotion from primarily Cu 3d valence band to Cu 4s conduction band states compared to O 2p valence band to Cu 4s conduction band states in CuO. In catalysts with a significant concentration of Cu vacancies, we observe fast electron trapping to the Cu 3d defect band occurring in less than 100 fs. In contrast, photoexcited electrons in phase pure CuO do not trap to midgap states; rather these electrons form small polarons within approximately 500 fs. Photoelectrochemical measurements of these catalysts show that Cu vacancy-mediated electron trapping correlates with a significant loss of photocurrent. Together, these results provide a detailed picture of the defect states and associated ultrafast carrier dynamics that govern the photocatalytic efficiency in widely studied Cu2O and CuO photocatalysts.

Photocatalytic Hydrogen Peroxide Production by a Mixed Ligand-Functionalized Uranyl-Organic Framework.

Hydrogen peroxide (H2O2) production driven by solar energy has received enormous attention due to its high efficiency, low cost, and environmental friendliness characteristics. Searching for new photocatalytic materials for H2O2 production is one of the most important targets. In this work, a new three-dimensional (3D) uranyl-organic framework material was constructed with mixed ligands via a solvothermal reaction and used for photocatalytic H2O2 production. The mixed ligand strategy not only benefits the construction of a 3D uranyl-organic framework but also introduces strong photon absorption groups into the framework. The thiophene and pyridine rings in the framework enhance photon absorption and carrier transfer. In addition, with the assistance of the hydrogen abstraction reaction of uranyl centers, the H2O2 production rate reaches 345 μmol h-1 g-1. This study provides a new blueprint for exploring the artificial photosynthesis of H2O2 through uranium-based metal-organic frameworks.

Tailored solar collector coatings: Synthesis and characterization of CuFe2O4/PANI nanocomposites

This work successfully synthesized CuFe2O4 nanoparticles and CuFe2O4/PANI nanocomposites via a simple chemical precipitation method followed by in-situ polymerization. The main objective is to investigate the solar selective properties of these novel nanomaterials for solar collector applications. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and Raman spectroscopy were used to characterize phase structure and crystallite sizes. Scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDS), transmission electron microscopy (TEM), atomic force microscopy (AFM), and UV–vis spectroscopy were performed to examine the morphology and optical characteristics of the nanostructures. XRD confirmed the development of spinel copper ferrite nanoparticles and copper ferrite/PANI nanocomposites with average crystallite sizes of 20.64 ± 4.04 nm, consistent with FT-IR and Raman results. Optical direct band gaps, estimated using Tauc plots, ranged from 2.7 eV to 3.3 eV for copper ferrite nanoparticles and reduced to 2.5 eV–3.0 eV with polyaniline inclusion. Reflectance spectra showed that CuFe₂O₄/PANI nanocomposites exhibited strong solar absorptance (αs) of 95 % in the visible spectrum and reduced emittance (εt) of 1 % in the infrared region, with a superior selectivity of 96.28 %. These nanocomposites can emerge as a novel class of selective coating materials with outstanding selective optical properties.

Selective construction and effective photothermal conversion of octanuclear metallacage and dinuclear metallatriangle based on the tetraphenylethylene unit

The structural regulation and functional development of supramolecular macrocycle and cage remains an interesting topics in the scientific community. Here, two bidentate and tetradentate tetraphenylethylene-based pyridine ligands were designed rationally. Utilizing the size variation of different organometallic rhodium building blocks, and coordination driven self-assembly strategy, three dinuclear metallatriangles and three octanuclear metallacages were synthesized. These structures have been fully demonstrated through single crystal X-ray diffraction technology, NMR spectrum and ESI-TOF-MS. Besides, strong near-infrared absorption prompts us to explore their near-infrared photothermal conversion effect. The results demonstrated that there is a clear correlation between the ability of photothermal conversion and the structural characteristics of building units. This study provides a good research approach for designing and synthesizing new photothermal conversion materials featuring excellent performance.

Novel 4D-printing pellets with infrared-light responsive shape memory effect

Four-dimensional (4D)-printing technology is attractive to researchers since it combines 3D printing with smart materials to produce 3D structures with various shapes and change shapes under specific external stimuli. Herein, novel shape memory polymer (SMP) pellets with infrared-light responsive shape memory effect were developed for 4D printing applications. The structures, properties, and infrared-light responsive shape memory performances of the resulting (SMP) pellets were thoroughly investigated. The results showed PDA/SMP pellets prepared by direct loading of polydopamine (PDA) particles on SMP pellets displayed less influence on the basic properties of SMP while fluidity was enhanced. The obtained PDA/SMP pellets employed as feed materials for particle 3D printers revealed good thermal-induced shape memory performance and photo-responsive shape memory performance in printed 3D structures. Under infrared-light irradiation, the curled shape recovered to straight splines within 60 s due to the strong absorption and good photo-thermal conversion of the loaded PDA nanoparticles under infrared light. Overall, the as-prepared PDA/SMP pellets look promising for use in biomedical fields and smart devices, as well as remote control deformation with 4D printing technology.

A molecularly imprinting photoelectrochemical sensor based on Bi2O2S-sensitized perovskite Cs2AgBiBr6 for sarcosine determination.

An original molecular imprinting photoelectrochemical (PEC) sensor for sarcosine detection based on stable lead-free inorganic halide double perovskite Cs2AgBiBr6 is proposed. Cs2AgBiBr6 as a lead-free halide perovskite material possesses severalpositive optoelectronic properties for PEC analysis, such as long-lived component to the charge-carrier lifetime, and strong absorption of visible light. At the same time, two-dimensional materials also offer excellent electronic and mechanical properties; thus, Bi2O2S was used and combined with Cs2AgBiBr6 to provide a stable and large photocurrent, which also benefits from the stability of perovskite Cs2AgBiBr6. Based on this novel PEC assay, the detection range for sarcosine was between 0.005 and 5000ng/mL with a low detection limit of 0.002ng/mL. This work also improved the adhibition of metal halide perovskite in analytical chemistry field, providing a novel way for other small molecule detection.

Phthalocyanine J-aggregate nanoparticles with enormous-redshifted and intense absorption: Potential structure-J-aggregation relationships and application in tumor-associated macrophages-targeted phototheranostics

Phthalocyanines (Pcs) are considered promising in cancer phototherapy. However, their maximum absorption wavelengths are only around 700 nm, which cannot allow deep tissue penetration and leads to poor therapeutic efficacy. To expand their clinical application, significantly shifting their absorption to longer wavelengths is urgently required. Dye J-aggregates exhibit a redshifted absorption relative to its monomer. However, Pc J-aggregates with enormous-redshifted and intense absorption is rarely reported, and little is known about the relationships between Pc structure and J-aggregation. Herein, such Pc J-aggregates are ingeniously conceived. With a yeast β-D-glucan-ursodeoxycholic acid conjugate as a potential tumor-associated macrophages (TAMs)-targeting carrier and 1-(4-carboxyethylphenoxy) zinc (II) phthalocyanine (Pc1) as a model, Pc1 J-aggregate nanoparticle (NanoPc1) is obtained via ultrasonication-aided emulsification-solvent evaporation technique. NanoPc1 displays strong absorption at 830 nm, with a 156 nm redshift. Further investigation on another twenty-four Pcs demonstrates that unsubstituted zinc (II) or magnesium (II) Pc and hydrophobic mono-substituted zinc (II) or magnesium (II) Pcs with mono-substituted phenoxy or phenylthio or naphthoxy as a substituent can readily form desired Pc J-aggregates with significant redshifts (140–165 nm). The other Pcs fail to form expected J-aggregates probably due to absence of central metals, steric hindrance on central metals (atoms), forming axial coordination on central metals, disorder tendency during self-assembly or hydrophilicity. The theoretical calculation indicates that Pc1 in its J-aggregates exhibits a spiral-like arrangement, and the reduction in the energy gap between HOMO and LUMO and variation of intermolecular π-π interaction caused by J-aggregate formation are responsible for the huge redshift. Additionally, using NanoPc1 as an exemplar, such Pc J-aggregate nanoparticles are substantiated to afford TAMs-targeted and efficient tri-modal imaging and photothermal therapy in a H22 mouse model.

Directional Electron Flow in a Selenoviologen-Based Tetracationic Cyclophane for Enhanced Visible-Light-Driven Hydrogen Evolution.

Directional electron flow in the photocatalyst enables efficient charge separation, which is essential for efficient photocatalysis of H2 production. Here, we report a novel class of tetracationic cyclophanes (7) incorporating bipyridine Pt(II) and selenoviologen. X-ray single-crystal structures reveal that 7 not only fixes the distances and spatial positions between its individual units but also exhibits a box-like rigid electron-deficient cavity. Moreover, host-guest recognition phenomena are observed between 7 and ferrocene, forming host-guest complexes with a 1:1stoichiometryin MeCN. 7exhibits good redox properties, narrow energy gaps, and strong absorption in the visible range (370-500 nm) due to containing two selenoviologen(SeV2+)units.Meanwhile, the femtosecond transient absorption (fs-TA) reveals that 7 has stabilized dicationic biradical, efficient charge separation, and facilitates directional electron flow to achieve efficient electron transfer due to the formation of rigid cyclophane and electronic architecture. Then, 7 is applied to visible-light-driven hydrogen evolution with high hydrogen production (132 μmol), generation rate (11 μmol/h),turnover number (221), and apparent quantum yield (1.7%), which provides a simplified and efficient photocatalytic strategy for solar energy conversion.

Novel two-dimensional CS semiconductor with tunable fantastic electronic and optical properties

First-principles calculations are addressed to study the stability, electronic and optical properties of the CS monolayer. It's found that the CS monolayer has excellent stability and semiconductor characteristics (Indirect band gap of 2.09 eV). Through applying external biaxial strain (−4%∼+4 %), the value of the indirect band gap of the CS monolayer is tuned in a wide interval (0.18–2.86 eV). The electronic and optical properties of the CS monolayer are also regulated by chemical modifications, exhibiting rich changing behaviors. Interestingly, the fully hydrogenated CS monolayer exhibits a wide direct band gap (3.61 eV), while the semi-hydrogenated CS monolayer exhibits an indirect band gap (3.11 eV), both have good stabilities. The absorption spectrum of the CS monolayer is found to have strong absorption in green light (528 nm) and ultraviolet light. While those of the chemically modified CS monolayers show strong absorption strength in violet and medium ultraviolet light, showing potential application in ultraviolet devices.

In situ encapsulation of heterostructures induced microscopic factors to enhance polarization loss of transition metal sulfides microwave absorbers

With the rapid development of modern electronic devices, electromagnetic wave pollution has become increasingly severe. In the field of materials science research, developing superior microwave absorbers holds immense importance. Light-weight carbon nanotube composites are developed for their unique electronic structure and excellent mechanical properties for wide applications in electronics, communication devices, and other specific parts, considering ideal candidates for the preparation of new types of electromagnetic wave absorption materials. This study focuses on embedding Fe7S8/FeS2 heterostructures into nitrogen doped carbon nanotubes through in-situ packaging to optimize interface engineering and improve the electromagnetic wave absorption efficiency of the material. Through pyrolysis and sulfidation processes, we successfully synthesized Fe7S8/FeS2 heterostructures in situ encapsulated within N-doped carbon nanotubes (NCNTs). Fe7S8/FeS2/NCNT shows microwave absorbing ability with a strong absorption (−36.83 dB at 14.08 GHz with a small thickness of 1.6 mm) and a broad effective absorption bandwidth (5.14 GHz). The excellent microwave absorption capability is mainly attributed to the efficient conductive network of NCNTs and the synergistic effect of Fe7S8/FeS2 heterostructures. This not only confirms the potential of transition metal sulfides/NCNTs composites in microwave attenuation applications, but also provides new strategies for the design and development of future microwave absorbers.

Directional Electron Flow in a Selenoviologen‐Based Tetracationic Cyclophane for Enhanced Visible‐Light‐Driven Hydrogen Evolution

Directional electron flow in the photocatalyst enables efficient charge separation, which is essential for efficient photocatalysis of H2 production. Here, we report a novel class of tetracationic cyclophanes (7) incorporating bipyridine Pt(II) and selenoviologen. X‐ray single‐crystal structures reveal that 7 not only fixes the distances and spatial positions between its individual units but also exhibits a box‐like rigid electron‐deficient cavity. Moreover, host‐guest recognition phenomena are observed between 7 and ferrocene, forming host‐guest complexes with a 1:1 stoichiometry in MeCN. 7 exhibits good redox properties, narrow energy gaps, and strong absorption in the visible range (370‐500 nm) due to containing two selenoviologen (SeV2+) units. Meanwhile, the femtosecond transient absorption (fs‐TA) reveals that 7 has stabilized dicationic biradical, efficient charge separation, and facilitates directional electron flow to achieve efficient electron transfer due to the formation of rigid cyclophane and electronic architecture. Then, 7 is applied to visible‐light‐driven hydrogen evolution with high hydrogen production (132 μmol), generation rate (11 μmol/h), turnover number (221), and apparent quantum yield (1.7%), which provides a simplified and efficient photocatalytic strategy for solar energy conversion.

Determination of the Electronic Structure, Charge-transfer, and Optical Properties of Neutral, Anionic, and Cationic Perfluoropentacene

Perfluoropentacene ( is an n-type organic semiconductor made by fluorination of p-type semiconductor Pentacene and can find applications in molecular thin film devices. In this work, a theoretical study of Perfluoropentacene was carried out based on density functional theory (DFT) and time dependent (TD-DFT) as implemented in Gaussian 09 package using B3LYP/6-311++G (d, p) and B3LYP/6-31+G(d) basis sets. The electronic, charge transfer, Linear and nonlinear optical properties of the molecule were calculated and reported for the neutral, anionic, and cationic forms of the molecule. The results show that the cationic state of the molecule has the strongest bond length at R(28,32) using the basis sets B3LYP/6-311++G (d,p) and the weakest bond length was found at R(4,6) in the ionic state with 6-31+G (d) basis set. The energy gap obtained for the neutral molecule using 6-31+G (d) and 6-311++G (d,p) basis sets are 2.00eV, 1.99eV respectively. The results show a strong agreement with a previously related work that reported the energy gap as 2.02eV thus indicating high stability of the molecule. Perfluoropentacene has the highest value of chemical hardness of 1.3929eV in its anionic state (Beta MO), so is considered to be harder and more stable than the neutral and cationic. The findings also revealed that with toluene as solvent, the strongest absorption was found at wavelength of 738.38, highest oscillator strength of 0.0599 and the lowest excitation energy of 1.6791eV. The calculated results of polarizability, first and second hyperpolarizability confirm that this molecule is a good non-linear optical material. On the whole, the molecule could be a good material for optoelectronic applications.

Enhancement of the microwave absorption performance of flaky FeSiCr powder through the compounding of cobalt ferrite

FeSiCr/CoFe2O4 composites were prepared by mechanical ball milling of cobalt ferrite prepared by hydrothermal method and flaky FeSiCr alloy powder. The phase and element of the composites was observed by XRD and XPS. The microstructure and surface elements of the composites were observed by SEM and EDS. The findings from the analyses confirmed the successful synthesis of the FeSiCr/CoFe2O4 composites. The results of EMP tests indicated that the electromagnetic parameters were balanced and the impedance matching was improved. When the mass percentage of cobalt ferrite was 20 %, the impedance matching was the best, and the RLmin reached −41.04 dB at 4.8 GHz. And the maximum EAB reached 5.4 GHz. By adjusting the thickness of the absorber, the EAB can be extended to 9.5 GHz (2.6–12.05 GHz), encompassing the entire C-band and X-band. The EMA performance of the composites has been greatly improved. FeSiCr/CoFe2O4 composites may serve as potential microwave absorbing materials in the future due to the wide range of economical raw materials, strong microwave absorption capacity and extensive absorption frequency range.