▎ 摘　　要

It is promising to fabricate renewable and flexible electronic devices due to increasing awareness of sustainable development of environmental-friendly materials. Flexible and renewable bio-based composite film (GLFF) based on graphene and lotus fiber (LF) was prepared by adding graphene into the mixture solution of lotus fiber and ionic liquid. The GLFFs show high electrical conductivity, remarkable electrochemical performance, excellent electromagnetic interference (EMI) shielding effectiveness (SE) and ability to generate heat. The surface resistance of GLFF reaches 19.01 sq(-1). The EMI SE of GLFF arrives at 30dB at the frequency ranging from 1 to 18GHz. In addition, the surface temperature of GLFF reaches 46.5 degrees C when only 7V was applied on GLFF surface. The area capacitance of the GLFF is 1088.7mFcm(-2). GLFF can maintain a specific capacitance of 85% of initial capacitance after 500 cycles. The influences of graphene content on mechanical property, sheet resistance, heat generation, EMI SE and electrochemical performance of GLFFs were investigated. GLFF, as renewable electrical materials, can be potentially applied in the fields of energy storage, electromagnetic shielding and heat generation. [GRAPHICS]