Bioinspired Brush Reinforced Solid Slippery Coatings for Marine Photovoltaic Protection

Abstract Plant cuticles exhibit exceptional liquid repellence and self‐healing properties through brush‐like cutin‐wax nanostructures, providing inspiration for the multifunctional slippery materials. Here, a plant cuticle‐inspired solid slippery surface (PI‐SSS) is introduced based on surface‐grafted polymer brushes, which act as a stable molecular matrix to enhance the adhesion strength of lubricating copolymer and the substrate (≈0.96 MPa) via strong ion‐dipole interactions. The resultant PI‐SSS demonstrates excellent optical transmittance (≈91.3%) and liquid repellence, particularly against crude oil, alongside multifunctional anti‐biofouling properties (e.g., proteins, chlorella, and mussels). The durability of the coating is validated under extreme conditions, such as prolonged acid and base solution exposure, repeated adhesion/peeling cycles, and seawater immersion, while maintaining its slippery behavior. These features significantly protect solar cells from harsh environments, ensuring a photoelectric conversion efficiency of 15.8% and a stable output voltage of approximately 2.0 V after continuous UV irradiation for a week, and 50 cycles of thermal tests between ‐15 °C and 100 °C, offering a promising approach for marine solar photovoltaic protection.