Nanostructured carbon materials are the first preference for fabricating electrodes as they have intrinsic conductivity, excellent chemical stability and high surface area. In this report, a novel two dimensional (2D) holey carbon nanosheet was prepared by pyrolysis of a composite of resorcinol–formaldehyde resin (RF) and calcium acetate (CA), followed by acid etching and base activation. The results reveal that CA plays a crucial role in the formation of the 2D holey carbon nanosheet. The CaO originated from the decomposition of CA was found not only to act a template for the holes, but a catalyst for the graphitic carbon. The obtained carbon nanosheet exhibited uniformly distributed holes with an average diameter of 60 nm. The hierarchical micro/mesoporous structure has a high surface area of 1258.2 m² g⁻¹, which is great for the fabrication of electrode materials in supercapacitor. It delivered a specific capacitance of 360.1 F g⁻¹ at the current density of 1.0 A g⁻¹ in 6.0 M KOH solution. Furthermore, a two-electrode symmetric supercapacitor based on the carbon material displayed an energy density of 13.3 Wh kg⁻¹ at a high power density of 7125 Wkg^–1. The supercapacitor also showed superior rate capability, cycle stability and great potential for use in practical applications.

纳米结构碳材料是制造电极的首选，因为它们具有固有的导电性，出色的化学稳定性和高表面积。在本报告中，通过热解间苯二酚-甲醛树脂（RF）和乙酸钙（CA）的复合物，然后酸蚀和碱活化，制备了一种新型的二维（2D）多孔碳纳米片。结果表明，CA在2D多孔碳纳米片的形成中起着至关重要的作用。发现源自CA分解的CaO不仅充当孔的模板，而且充当石墨碳的催化剂。所获得的碳纳米片表现出平均直径为60nm的均匀分布的孔。分层的微/中孔结构具有1258.2 m ²  g的高表面积^-1，对于超级电容器中电极材料的制造非常有用。它在6.0 M KOH溶液中以1.0 A g ^-1的电流密度提供了360.1 F g ^-1的比电容。此外，基于碳材料的两电极对称超级电容器在7125 Wkg ^–1的高功率密度下显示出13.3 Wh kg ^-1的能量密度。超级电容器还显示出优异的倍率能力，循环稳定性以及在实际应用中的巨大潜力。