▎ 摘　　要

Bioinspired functionalized graphene oxide/deacetylatedcelluloseacetate composite sustainable Janus membranes were successfully preparedin this research. It can not only generate electricity in the caseof water evaporation but also be microbially degradable. Harvesting electricity from natural water evaporationhas recentlybecome a popular research direction owing to its spontaneity, ubiquitousness,and sustainability. In this study, we demonstrate a bioinspired compositeJanus membrane based on functionalized graphene oxide (FGO)/deacetylatedcellulose acetate (dCA) nanofiber. FGO has a high surface charge anda low oxygen to carbon atom ratio (O-AC/C-AC),which helps attract ions and facilitate the transfer of carriers.The hydrophilic dCA not only provides a driving force for water andion transport in FGO but also accelerates water evaporation in thecomposite Janus membrane, thereby increasing the electrical output.As a result, a small piece of the membrane can provide similar to 316mV and similar to 997 nA of voltage and current, respectively. The highelectric energy output could be easily achieved through series andparallel expansion of the membrane and utilized to supply power toelectronics or for capacitor charge. Once the generator has reachedthe end of its life cycle, dCA can be effortlessly biodegraded withina week without posing a threat to the environment. This work establishesa new paradigm for developing high-performance biodegradable electricitygenerators powered by water evaporation.