To solve the problem of complex structure and narrow absorption band of most of today′s terahertz absorbers, this paper proposes and utilizes the finite element (COMSOL) method to numerically simulate a broadband absorber based on a straightforward periodic structure consisting of a disk and concentric ring. The final results show that our designed absorber has an absorption rate of over 99% in the broadband range of 9.06 THz to 9.8 THz and an average of over 97.7% in the ultra-broadband range of 8.62 THz to 10 THz. The reason for the high absorption is explained by the depiction of the electric field on the absorber surface at different frequencies. In addition, the materials for the top pattern of the absorber are replaced by Cu, Ag, or Al, and the absorber still achieves perfect absorption with different metal materials. Due to the perfect symmetry of the absorber structure, the absorber is very polarization-insensitive. The overall design is simple, easy to process and production. Therefore, our research will offer great potential for applications in areas such as terahertz electromagnetic stealth, sensing, and thermal imaging.

In recent years, as a renewable clean energy with many excellent characteristics, solar energy has been widely concerned. In this paper, we propose an ultra-broadband solar absorber based on metal tungsten and semiconductor GaAs structure. A multilayer metal semiconductor composite structure composed of W-Ti-GaAs three-layer films and GaAs gratings is proposed. The finite difference time domain method is used to simulate the performance of the proposed model. High efficiency surface plasmon resonance is excited by adjusting the geometric parameters, and the broadband absorption of up to 2,350 nm in 500–2850 nm is realized. The spectrum of the structure can be changed by adjusting the geometric parameters to meet different needs. The proposed absorber has good oblique incidence characteristics (0–60°) and high short-circuit current characteristics. The geometry of the absorber is clear, easy to manufacture, and has good photoelectric performance. It can realize solar energy collection, light heat conversion, high sensitive sensing and other functions.

Solid-state lithium batteries have attracted much attention due to their special properties of high safety and high energy density. Among them, the polymer electrolyte membrane with high ionic conductivity and a wide electrochemical window is a key part to achieve stable cycling of solid-state batteries. However, the low ionic conductivity and the high interfacial resistance limit its practical application. This work deals with the preparation of a composite solid electrolyte with high mechanical flexibility and non-flammability. Firstly, the crystallinity of the polymer is reduced, and the fluidity of Li+ between the polymer segments is improved by tertiary polymer polymerization. Then, lithium salt is added to form a solpolymer solution to provide Li+ and anion and then an inorganic solid electrolyte is added. As a result, the composite solid electrolyte has a Li+ conductivity (3.18 × 10−4 mS cm−1). The (LiNi0.5Mn1.5O4)LNMO/SPLL (PES-PVC-PVDF-LiBF4-LAZTP)/Li battery has a capacity retention rate of 98.4% after 100 cycles, which is much higher than that without inorganic oxides. This research provides an important reference for developing all-solid-state batteries in the greenhouse.

The zinc dendrite growth and by-products formation of rechargeable zinc metal batteries hinder their rapid development as promising energy storage equipment. Herein, we use a composite additive composed of leveling agent and surfactant to improve the ZnSO4 electrolyte system to obtain a zinc anode with reversible electroplating/stripping for high-performance aqueous zinc ion batteries (ZIBs). Benzylidene acetone leveling agent can be adsorbed on the crystal nucleation sites to promote homogeneous nucleation in the zinc deposition process, thus inhibiting the zinc dendrites growth, zinc corrosion, and by-products formation. Alkylphenol ethoxylate can improve the crystallinity of the zinc anode surface and increase the nucleation sites, thus reducing the potential nucleation barrier in the zinc deposition process. In addition, alkylphenol ethoxylate is the carrier of benzylidene acetone, which can cooperate with benzylidene acetone, and further enhance the leveling effect of benzylidene ketone. As a result, the Zn/Zn symmetric battery with ZSO+additive electrolyte displays a small overpotential and good cycle stability for 1000 hours. With the increase in current density, the voltage hysteresis does not severely fluctuate. The Zn/MnO2 battery with ZSO+additive electrolyte can provide a higher capacity (179.7 mAh g -1 ) and longer cycle life (76.6% capacity retention after 200 cycles), which proves that the additives can improve the performance of ZIBs. The composite additive proposed in this work provides a new way to develop high-performance zinc ion batteries.