Efficient Light to Heat Conversion in Sb2Se3 Nanorods and the Role of Macro‐channel Imprinted Sb2Se3 Loaded Hybrid Membrane for Superior Desalination Performance

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Abstract This report validates Sb2Se3 nanorods (NRs) as a potential contender for solar thermal heat generation. The water droplet experiment shows Sb2Se3's light‐to‐heat conversion efficiency as ≈57.8% for red (671 nm), 58% for green (532 nm) lasers. Following this PVDF(M)/ Sb2Se3 NRs hybrid membranes for solar desalination reached ≈59°C in 15 minutes of illumination. The heat generation is dominated by an electron/hole‐acoustic phonon scattering mechanism. Despite having superior visNIR absorption and heat localization in Sb2Se3 NRs, the hybrid membranes show an evaporation rate of 1.72 kg m−2 h−1 only, even if mass loading is increased. The hydrophobic Sb2Se3 NRs layer restricts water diffusion to hot zones, reducing solar evaporation efficiency. A novel macro channel imprinting strategy in hybrid membranes speeds up water transport to the hot zone. Consequently, optimized macro channel membranes achieve ≈2.37 kg m−2 h−1 mass loss and 148% solar evaporation efficiency under a 1000 W m−2 mercury vapor lamp. Therefore, imprinting macro‐channel can be a possible strategy, addressing the hydrophobic materials in desalination applications which can be expanded in other similar materials. Moreover, its outdoor sunlight application achieves impressive solar evaporation efficiency (≈108%). The steam generated effectively removes heavy metals, meeting World Health Organization (WHO) potable water standards.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.