More importantly, it is found that the macromorphology significantly influences water transport and interfacial thermal management of SISGs thus the integrated absorber has an obvious advantage over the other two absorbers, which possesses a high evaporation efficiency of 71.9% at normal solar illumination. Three kinds of self-floated flour-based absorbers, i.e., near-cylindrical (integrated), near-spherical (loose packing), and powdery (dense packing) absorber used as SISGs, are discussed. Herein, a facile, sustainable, and scalable approach is proposed to produce tailored SISGs with controlled macromorphology derived from flour via “dough figurine” technology originating from the China Han Dynasty. A shape- and size-controlled, low-cost, eco-friendly solar-absorber material is urgently desired for practical applications of SISGs. A solar-driven interface steam generator (SISG) has potential applications in saline water desalination and polluted water purification.
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