▎ 摘　　要

Self-standing and flexible membranes based on reduced graphene oxide (rGO)/SnO2 nanocomposite and cellulose fibers are here presented. The flexible membranes are prepared through an easy and eco-friendly protocol: the rGO/SnO2 nanocomposite is synthetized via a microwave-assisted procedure and then assembled with microfibrillated cellulose (MFC) through a water-based process. This process leads to the formation of a nanocomposite in which cellulose nanofibers are integrated with the graphene matrix. Beyond the good flexibility, the nanocomposite membranes present interesting properties in terms of capacitive behavior and catalytic activity: the electrochemical characterizations revealed that such material is an extremely competitive candidate for the oxygen reduction reaction, even comparable to the commonly used Pt-based catalysts. Furthermore, the possible application as electrodes for flexible supercapacitors and piezoresistive sensors is also investigated showing the great potential of such composite material. (c) 2019 Published by Elsevier Ltd.