Preparation and Performance of Phase Transition Energy Storage for Nano-Porous NCC/PEG Aerogel

摘要

By use of vacuum freeze-drying method, nanocrystalline cellulose/polyethylene glycol (NCC/PEG) aerogel was prepared by adding polyethylene glycol (PEG-4000) to NCC gel solution with other additives. And the micro-structure morphology, specific surface area, pore porosity and pore size, enthalpy of phase transition of NCC/PEG aerogel was separately characterized with transmission electron microscopy (TEM) and scanning electron microscopy (SEM), BET adsorption measurement, and differential scanning calorimetry (DSC). The results show that NCC/PEG aerogel can be prepared with adding 40%, 50% and 70% of PEG (mass fraction of PEG in NCC/PEG), respectively. When adding 50% of PEG, the ratio of actual degree of crystallinity to theoretical degree of crystallinity (X_c/X_(c1)) is 1.366 and enthalpy of phase transition reaches up to 128.1 J/g, which means efficiency of energy storage is relatively higher under the prepared condition. NCC/PEG aerogel material is a kind of porous solid-solid phase transition materials with high enthalpy of phase transition and high energy storage efficiency.