摘要
Hierarchical PPy/GO/Ag coatings boost broadband photothermal conversion. • Controlled LbL self-assembly of PPy, 2D GO and 0D Ag NPs is achieved. • Multilayer interfaces enable solar evaporation and thermoelectric/thermotherapy. Solar energy as abundant, carbon-neutral and globally accessible energy, has garnered considerable research attention in sustainable photothermal conversion technologies. To overcome the intrinsic limitations of narrow spectral absorption and incomplete photon utilization in single-component photothermal systems, this work engineered the hierarchical polypyrrole/graphene oxide/silver nanoparticles (PPy/GO/Ag) composite coatings with multilayer interfaces on fabrics through convenient and universal layer-by-layer (LbL) self-assembly strategy. This rational design yielded hierarchical PPy/GO/Ag composite coated fabrics with 93.3% broadband absorption across the solar spectrum (300–2500 nm). Under 1 kW·m⁻ 2 (1 sun) solar irradiation, the optimized PPy(GO/Ag)-3 composite coatings achieved a steady-state surface temperature of 73.1 °C within 300 s. When integrated with a commercial thermoelectric module, the composite coatings as flexible photo-thermoelectric generator leveraging the Seebeck effect, delivered a stable open-circuit voltage of 39.7 mV and short-circuit current of 9.4 mA, corresponding to a power density of 233.2 mW·m⁻ 2 . In solar-driven interfacial evaporation, the composite coatings achieved high water evaporation rate of 2.01 kg·m⁻ 2 ·h⁻ 1 with photothermal conversion efficiency of 92.1% under 1 sun irradiation. For personal thermotherapy, the composite coated fabric maintained a safe and therapeutically effective surface temperature on human body under both simulated sunlight and natural daylight. Thus, this work provided a versatile photothermal platform for next-generation solar-harvesting systems targeting multi-scenario applications. Download: Download high-res image (322KB) Download: Download full-size image
危险品化学品经营许可证（带存储）