Although great attention has been paid to wearable electronic devices in recent years, flexible lightweight batteries or supercapacitors with high performance are still not readily available due to the limitations of the flexible electrode inventory. In this work, highly flexible, bendable and conductive rGO-PEDOT/PSS films were prepared using a simple bar-coating method. The assembled device using rGO-PEDOT/PSS electrode could be bent and rolled up without any decrease in electrochemical performance. A relatively high areal capacitance of 448 mF cm⁻² was achieved at a scan rate of 10 mV s⁻¹ using the composite electrode with a high mass loading (8.49 mg cm⁻²), indicating the potential to be used in practical applications. To demonstrate this applicability, a roll-up supercapacitor device was constructed, which illustrated the operation of a green LED light for 20 seconds when fully charged.

The rapid development of wearable devices has stimulated the pursuit of unconventional and multifunctional flexible supercapacitors such as stretchable, compressible, electrochromic, self-healable or transparent supercapacitors. Redox-active conducting polymers (CPs) that combine metal like electrically conductive properties with polymer like mechanical properties are ideal materials for use. However, they suffer from poor performance due to volume variations during charge and discharge processes. The integration of CPs with other materials to form composites provides an effective approach to achieve excellent performance. This review discusses the recent progress on the design and fabrication of CP composites with tailored microstructures for these novel supercapacitors. It will cover a wide range of materials with different intrinsic properties (e.g. carbon materials, metal oxides/hydroxides, and two dimensional materials) to be incorporated with CPs. It aims to provide insights into the synergistic effect of components on the supercapacitive performance of composites. We also present the strategies towards their practical applications in integrated systems and future perspectives.