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.超级电容器（Supercapacitors, SC）相较于传统电池，凭借电荷传输速率快、功率密度高、质量轻盈且循环寿命长的优势，成为储能领域的亮眼解决方案。在各类超级电容器技术中，叉指型平面超级电容器具备平面化设计、结构紧凑、耐用性强且工作温度范围宽的特点，使其成为器件集成的理想之选。本研究报道了一种绿色可持续纳米复合材料的积极应用效果：该材料由爆轰纳米金刚石（detonation nanodiamonds, DND）与二氧化钛（TiO₂）纳米颗粒合成，用作纸基叉指丝网印刷碳电极型超级电容器的隔膜。该DND-TiO₂纳米复合材料兼具机械稳定性与热稳定性，同时呈现出利于离子传导的纳米多孔形貌。通过氢气退火工艺，可最大化发挥TiO₂与DND之间的协同效应。采用该DND-TiO₂隔膜的超级电容器可实现高能量密度与功率密度，比电容达597 μF/cm²，且在10000次循环后仍保持100%的容量保持率，显著提升了超级电容器的性能与耐用性。本研究结果凸显了纳米金刚石在优化超级电容器器件乃至其他储能技术方面的应用潜力。