Cellulose/MOF nanohybrids derived 3D interconnected porous carbon based LiOH-composite for solar-driven chemical heat storage

Abstract

In the face of the sustainability dilemma caused by the incompatibility between renewable energy and actual demand, hydrated salt chemical heat storage (CHS) with long-desired storage capabilities has become a silver line for the underutilization of clean energy. In this work, a bacterial cellulose@zeolitic-imidazolate framework nanohybrid (BC@ZIF-8) was prepared and its derived 3D-porous carbon network (BZAC) was implemented as the porous nanomatrix for LiOH·CHS material. The resultant Li/BZAC2 composites present a fabulous energy density of 2317.6 kJ kg⁻¹ credited to the synergistic collaboration of the 3D interconnected network architecture, highly developed hierarchical porosity, and enormous surface area of BZAC2. Besides, the Li/BZAC2–60 could keep 95.8 % of the original heat after 20 multicyclic operations, revealing its marvelous cycle persistence. The Li/BZAC2–60 with eminent thermal conductivity also demonstrates impressive solar-driven photothermal conversion capability. This work may deliver an innovative option for the further functionalization of the carbonaceous network derived from metal-organic frameworks via templating strategies and diversification of its implementation domains.