DEVELOPMENT OF SOLAR ABSORBERS FOR WATER EVAPORATION USING BISMUTH-TIN CORE-SHELL PARTICLES

Date

2024-1-20

Author

İnce, Duygu

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This thesis explores the development of a solar absorber layer using BiSn core-shell particles for water evaporation systems addressing water scarcity. BiSn core-shell particles with recently discovered photothermal properties were synthesized using ultrasonication, from their alloy at eutectic composition, and used in water evaporation devices, for the first time in literature. Strategies for constructing solar water evaporation devices, including structural components and photothermal materials, were investigated. The solar absorber layers, prepared by integrating BiSn particles into cellulose substrates, demonstrated broadband light absorption, reaching approximately 85% in the wet state. When the absorber layer was incorporated into the prototype, the system achieved a maximum wet surface temperature of 37 °C. The evaporation rate was measured over 15 cycles, without showing a significant drop in performance. The average water evaporation efficiency during experiments was 85%, reaching a maximum evaporation rate of 1.49 kg/m²h. Saline water tests revealed that the performance was maintained with 10% salinity during 1-hour experiments, demonstrating the robustness of the system under conditions far exceeding the average seawater salinity of 3.5%. At 20% salinity, the performance decreased as expected under such extremely harsh conditions. For system validation, the performance of conductive carbon black, a commonly used photothermal material in water evaporation devices, was tested alongside BiSn under comparable conditions, confirming the reliability of the system. The liquid metal core and oxide shell of BiSn particles along with their core-shell structure make them a promising material for solar evaporation systems.

Subject Keywords

Solar Water Evaporation, Bismuth-Tin Core-Shell Particles, Liquid Metal, Broadband Light Absorption, Photothermal Materials

URI

https://hdl.handle.net/11511/113403

Collections

Graduate School of Natural and Applied Sciences, Thesis