%0 Journal Article
%A Jian Zeng
%A Xintong Zhang
%A Ka Man Chung
%A Tianshi Feng
%A Haowen Zhang
%A Ravi S Prasher
%A Renkun Chen
%B Cell Reports Physical Science
%D 2023
%G eng
%N 2
%P 101250
%R 10.1016/j.xcrp.2023.101250
%T Moisture thermal battery with autonomous water harvesting for passive electronics cooling
%U https://linkinghub.elsevier.com/retrieve/pii/S266638642300005X
%V 4
%8 02/2023
%! Cell Reports Physical Science
%X <p>Passive cooling ofhigh-powerelectronicswithminimumenergyand water input is critical for the global water-energy nexus but has been challenging because of the large fluctuation in power and heat loads between the on/off-peak hours. Here we develop a moisture thermal battery (MTB) by coating superabsorbent hydrogel onto a pin fin heat sink with a large surface. The MTB leverages large latent heat and high thermal conductance of water evaporation for electronics cooling during on-peak hours and, importantly, autonomously harvests atmospheric moisture and stores the water during off hours. The MTB provides a thermal capacity of up to 200 kWhm<sup>-2</sup>forevaporative cooling with a record-high effective heat transfer coefficient of up to 1,000 W m<sup>-2</sup> K<sup>-1</sup> for a passive device (no external power). The MTB suppresses the temperature f luctuation of a high-power field effect transistor and a computer CPU between the on- and off-peak hours by 15 K.</p>