High‐Performance Photothermal Conversion of Narrow‐Bandgap Ti2O3 Nanoparticles

Ti₂ O₃ nanoparticles with high performance of photothermal conversion are demonstrated for the first time. Benefiting from the nanosize and narrow-bandgap features, the Ti₂ O₃ nanoparticles possess strong light absorption and nearly 100% internal solar-thermal conversion efficiency. Furthermore, Ti₂ O₃ -nanoparticle-based thin film shows potential use in seawater desalination and purification.