Spider web-inspired strong and sough PVA-based fiber membranes with interconnected network structure for green energy applications

• FAN-structured PVA membranes achieve high strength (5 MPa) and elongation (76 %). • FAN structure enables a biodegradable TENG with 315 μW/cm 2 and 20k-cycle stability. • The membrane achieves 14 °C cooling via high reflectance and emissivity. • Excellent recyclability (>6 cycles) and full soil biodegradation in 50 days. Electrospinning hydrogel fiber membranes hold promise in flexible sensing, tissue engineering, and membrane engineering. However, improving their mechanical properties while ensuring environmental friendliness remains a major challenge. In this work, a hydrogel fiber membrane with a spider silk-inspired fiber anchored network (FAN) structure was fabricated via humidity-programming electrospinning. The inter-fiber anchoring mode of the FAN structure replicates that of spider silk to achieve enhanced mechanical performance, with a tensile strength of 5.7 MPa and a maximum elongation of 76 %. The FAN hydrogel fiber membrane has been applied in the fields of biodegradable triboelectric nanogenerators (BD-TENG) and passive daytime radiation cooling (PDRC), demonstrating excellent performance. The BD-TENG assembled using this hydrogel fiber membrane achieved a power density of 315 μW/cm 2 and maintained stable operation over 20,000 cycles. Experimental analysis indicates that the hydrogel fiber membrane, benefiting from the introduction of the FAN structure, facilitates charge generation and transmission during triboelectric charging, thereby enhancing the overall performance of the BD-TENG. In terms of PDRC, the inherent fiber structure endows the hydrogel fiber membrane with 93.78 % solar spectrum reflectance, achieving a maximum cooling effect of 14 °C at noon. The raw materials used in this study are environmentally friendly and non-toxic. The hydrogel fiber membrane exhibits good recyclability and biodegradability, which can be recycled 6 times without significant performance degradation and completely degraded naturally in soil within 50 days. This membrane synergizes high mechanical strength, efficient green energy conversion, passive energy-saving, recyclability, and eco-friendliness, offering a sustainable platform for next-generation green energy technologies.