Compatible and high-efficiency quasi-solid-state integrated photocapacitor based on the synergism of PEDOT/RGO electrode and gel electrolyte to improve the carrier migration

Abstract

An integrated photocapacitor (IPC) is a light-driven self-charging capacitor, which can overcome the impact of solar energy fluctuations by converting the solar radiation to electrochemical energy and store it simultaneously. However, current IPCs suffer from incompatibility problems, device packing, serious carrier recombination, and long-range electron transmission path, which lead to low conversion efficiency and cycling performance. To address these issues, we propose a three-electrode quasi-solid-state IPC based on a charge-separated transition mechanism of PEDOT/RGO compatible electrode and BMIMBF₄ ion gel electrolyte to accelerate carrier migration. The overall conversion efficiency of this IPC reached 5.8% and the energy storage efficiency could be maintained at 84.57%. Besides that, this bendable free-standing electrode can be applied in flexible and high-voltage IPCs as a reliable off-grid systems to supply next-generation electronics.