Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, P. R. China.
Shenzhen Institute of Advanced Electronic Materials-Shenzhen Fundamental Research Institutions, Shenzhen Institute of Advanced Technology Chinese Academy of Sciences, Shenzhen, 518055, P. R. China.
Adv Mater. 2023 Apr;35(15):e2210038. doi: 10.1002/adma.202210038. Epub 2023 Feb 26.
Filter capacitors (FCs) are substantial for digital circuits and microelectronic devices, and thus more compact FCs are eternally demanded for system miniaturization. Even though microsupercapacitors are broadly regarded as an excellent candidate for future FCs, yet due to the limitation of available electrode materials, the capacitive performance of reported MSCs drops sharply under high-frequency alternating current. Herein, we present a unique laser-induced transient self-organization strategy, which synergizes pulsed laser energy and multi-physical field controlled coalescence processes, leading to the rapid and controllable preparation of titanium nitride ultrafine nano-filaments (diameter ≈3-5 nm) networks. Their chaotic fractal nanoporous structure, superior specific surface area, and excellent conductivity render these nanostructures promising candidates for FCs. Surface-mounted filter capacitors based on this electrode material exhibit ultra-long cycle-life (2 000 000 cycles) with record ultrahigh volumetric energy density of 9.17 mWh cm at 120 Hz in aqueous electrolyte, displaying advantages in function, size, and integrability compared with the state-of-the-art aluminum electrolytic capacitors. The method here provides a versatile toolbox for designing novel nanostructures with intriguing characteristics and insights for developing advanced and miniaturized filter and power devices.
滤波电容器（FCs）对于数字电路和微电子设备至关重要，因此，为了实现系统的小型化，人们一直需要更紧凑的 FC。尽管微型超级电容器被广泛认为是未来 FC 的理想候选者，但由于可用电极材料的限制，所报道的 MSC 在高频交流下的电容性能急剧下降。在此，我们提出了一种独特的激光诱导瞬态自组织策略，该策略结合了脉冲激光能量和多物理场控制的聚并过程，从而能够快速且可控地制备氮化钛超细纳米纤维（直径≈3-5nm）网络。其混沌分形纳米多孔结构、超高比表面积和优异的导电性使这些纳米结构成为 FC 的理想候选者。基于这种电极材料的表面贴装式 FC 具有超长的循环寿命（2000000 次循环），在水基电解液中，在 120Hz 时的超高体积能量密度达到 9.17mWh cm，与最先进的铝电解电容器相比，在功能、尺寸和集成方面具有优势。该方法为设计具有有趣特性的新型纳米结构提供了一个通用工具包，并为开发先进的小型化 FC 和电源设备提供了新的思路。
