Self-powered and flexible integrated solid-state fiber-shaped energy conversion and storage based on CNT Yarn with efficiency of 5.5%

Self-powered and flexible integrated solid-state fiber-shaped photo capacitors (SS-FPCs), which combine energy-harvesting and energy-storage functions in a single device, have drawn a lot of attention as potential applications in wearable electronics. Herein, a flexible carbon nanotube yarn (CNTY) with improved mechanical and electrical properties is used as a shared electrode to create SS-FPCs. In addition, CNTY was doped into n- and p-type using polyethyleneimine (PEI) and iron (III) chloride (FeCl3) to improve the electrocatalytic behavior of CNTY, respectively. The optimized SS-FPC based on p-type material-doped CNTY, which integrates the high specific capacitance of the solid-state fiber-shaped electrochemical energy storage (SS-FES) unit with 78.26 mF cm−2 and a high power conversion efficiency (PCE) of the solid-state fiber-shaped dye-sensitized solar cells (SS-FDSSCs) unit with 5.50%, exhibits a remarkable overall energy conversion efficiency of up to 4.69% and excellent discharging time of about 6 min owing to the synergistic action of the two units. Compared to traditional integrated power systems, our self-powered and flexible integrated SS-FPCs are lightweight, flexible, affordable, and suitable for special applications, especially fabric for wearable electronics.

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