▎ 摘　　要

The effect of structure (density and porosity) and composition (ratio) of composites prepared from cellulose nanofibrils (CNF) and reduced graphene oxide (RGO) as film-like xerogels and porous cryogels, respectively, were investigated related to their dielectric performance and electrochemical storage abilities. A very small content (5 wt%) of RGO incorporated xerogelic film of a denser and layered structure shows relatively high dielectric constant of similar to 85 and similar to 164 and an ac electrical conductivity of 0.0028 S/m(2) and 0.0072 S/m(2) at 270 K and 370 K, respectively, at a high frequency of 1 MHz showing their suitability for high temperature dielectric storage applications. On the other hand, a high specific capacitance of similar to 460 F/g and electrochemical resistance of 12-15 Omega cm(2) was observed for well-aligned and longitudinal-oriented micro-porous cryogel, indicate on its suitability as electrodes for electrochemical storage devices. (C) 2018 Elsevier Ltd. All rights reserved.