An electrochemically stable two-dimensional covalent organic framework, PI-COF, has been synthesized by a scalable solvothermal method. PI-COF possesses a highly crystalline structure, well-defined pores, high specific surface area, and cluster macrostructure. Thanks to these features, PI-COF can work as electrode materials in organic supercapacitors, exhibiting a specific capacitance of 163 F/g at 0.5 A/g over a wide potential window of 0–2.5 V. Moreover, PI-COF shows excellent rate performance, which can deliver 96 F/g even at a high current density of 40 A/g. Because of the high capacitance and wide potential window, PI-COF has achieved a superior energy density of 35.7 W·h/kg at a power density of 250 W/kg. Most importantly, due to the remarkable electrochemical stability, the PI-COF based device shows outstanding cycling stability with 84.1% capacitance maintained (137 F/g) after 3.0 × 10⁴ charged/discharged cycles at 1 A/g. This work should shed light on designing new COF-based electrode materials for supercapacitors and other electrochemical devices.

电化学稳定的二维共价有机骨架PI-COF已通过可扩展的溶剂热方法合成。PI-COF具有高度结晶的结构，清晰的孔，高的比表面积和簇状宏观结构。由于这些特性，PI-COF可以用作有机超级电容器中的电极材料，在0-2.5 V的宽电位范围内，在0.5 A / g的条件下表现出的比电容为163 F / g。性能，即使在40 A / g的高电流密度下也可以提供96 F / g的功率。由于高电容和宽电位窗口，PI-COF在250 W / kg的功率密度下实现了35.7 W·h / kg的出色能量密度。最重要的是，由于其出色的电化学稳定性，基于PI-COF的器件显示出出色的84循环稳定性。1 A / g的^4个充电/放电循环。这项工作应为设计用于超级电容器和其他电化学装置的基于COF的新型电极材料提供启发。