<p>➀ A recent study introduces a Janus membrane for water purification and energy generation, aiming to address water scarcity and energy needs; </p><p>➁ The membrane uses cellulose nanofibers (CNF) and a modified MXene to improve performance over longer periods; </p><p>➂ The Janus membrane demonstrates better performance than traditional membranes, achieving a high evaporation rate and photothermal conversion efficiency, and effectively preventing salt buildup.</p>