Abstract
The design of shape-stable phase change composites (PCCs) with electrothermal conversion/storage performance provides a new direction for their potential applications in advanced electric energy storage. Herein, a cellulose nanofiber sponge coated with polypyrrole (PPy@CNF) was constructed and used to incorporate polyethylene glycol (PEG) to afford the PPy@CNF-PEG composite. The resulting PPy@CNF-PEG composite exhibited good shape-stable property and high melting enthalpy (169.7 J/g). Even when compressed at 440 times its own weight, the composite still maintained its original shape and gave off no molten PEG. By applying small voltages (1.75–1.9 V), it was also shown that the composite converted electricity to heat with efficiencies (up to 85.1%). This work demonstrates a simple, effective and general strategy to prepare biomass-derived composites with high electrothermal conversion efficiency for smart electric devices devoting to energy conversion and storage.
Published Version
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