Dataset of "Nanodiamond-based TiO2 Nanocomposite Separators for Enhancing Performance of Flexible Paper-based Supercapacitors"

Supercapacitors (SC) stand out as a storage solution owing to rapid charge transfer, high power density, low weight and long lifecycle compared to batteries. Among the SC technologies, interdigitated in-plane SCs offer planar design, compactness, durability and wide temperature range, which all makes them ideal choice for device integration. Here we report a positive role of a green sustainable nanocomposite material, synthesized from detonation nanodiamonds (DND) and TiO2 nanoparticles, when used as a separator in SC devices with interdigitated screen-printed carbon electrodes on paper. The DND-TiO2 nanocomposite provides mechanical and thermal stability and exhibits nanoporous morphology that facilitates ion conduction. The synergic effect between TiO2 and DND is maximized by annealing in hydrogen. Such DND-TiO2 separator leads to high energy density and power density with 597 µF/cm² capacitance and 100% stability after 10,000 cycles, significantly boosting SC performance and durability. These results highlight potential of nanodiamonds for improving SC devices and potentially also other energy storage technologies.