Anisotropic two-dimensional (2D) semiconductors have emerged as promising candidates for polarization-resolved photodetection due to their intrinsic in-plane optical anisotropies and linear dichroisms. However, their practical applications are often constrained by limited spectral response and low anisotropy ratios. In this work, we report a broadband polarization-sensitive photodetector based on a type-II p-GaTe/n-PdSe₂ van der Waals heterostructure, where interfacial band engineering—through the combined effect of the built-in p–n junction field and Schottky barrier—enables efficient carrier separation and unconventional reverse rectification. The device exhibits a high reverse rectification ratio (> 10²) and an ultra-low forward dark current (~ 10⁻¹¹ A). Owing to the engineered band alignment, it achieves broadband photodetection from 365 to 940 nm, with a high photo-switching ratio (> 10³), responsivity (~ 10³ A/W), detectivity (~ 10¹³ Jones), and external quantum efficiency (~ 10⁴%). Furthermore, strong polarization sensitivity is demonstrated, with polarization ratios of 5.39, 4.71, and 4.60 at the wavelengths of 365, 520, and 940 nm, respectively, highlighting the potential of this heterostructure for high-performance and polarization-resolved optoelectronic applications.

Aqueous alkaline battery represents a promising energy storage technology with both high energy density and high power density as rechargeable batteries. However, the low theoretical capacities, kinetics and stability of anode materials have limited their developments and commercializations. In this study, we propose a novel method to produce two-dimensional layered bismuth oxide selenium (Bi₂O₂Se) and reduced graphene oxide (rGO) composites via a one-step hydrothermal method. The volume change caused by phase change during rapid charging and discharging is significantly reduced and the capacity reaches 263.83 mAh g⁻¹ at a current density of 0.5 A g⁻¹. The Bi₂O₂Se/rGO electrode exhibits excellent cycling stability in which the capacity retention rate is 81.04% after 5000 cycles. More importantly, the Bi₂O₂Se/rGO nanosheet composite is used as the anode electrode material with MnCo₂O_4.5@Ni(OH)₂ as the cathode electrode material in aqueous alkaline battery. When the energy density is 76.16 W h kg⁻¹, the power density reaches 308.65 W kg⁻¹. At a power density of 10.21 kW kg⁻¹, the energy density remains as high as 33.86 W h kg⁻¹. The results presented here may advance the understanding of the issues facing the development of aqueous battery anode materials.