Abstract Assembling supercapacitors (SCs) using high-voltage ionic liquid (IL) as electrolyte is an effective strategy to enhance the energy density of SCs. Herein, a novel pseudocapacitive quantum dots (QDs)-based electrode with superior electrochemical behaviors in IL electrolyte has been put forward. Remarkably, FeOOH QDs (FQDs) are effectively confined in a two-dimensional (2D) nanospace supported by porous N-doped carbon (PNC) derived from graphitic carbon nitride (g-C3N4). Beneficial from the abundant active sites and high surface wettability, the resultant FQDs/PNC electrode exhibits sufficient redox reaction and favorable electrochemical kinetics in IL electrolyte. As a result, it can deliver a large specific capacitance of 210.6 F g−1 and still retain 82.2% of its initial capacitance after 10,000 cycles.

中文翻译：

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用于高性能离子液体超级电容器的牺牲性 g-C3N4 衍生碳纳米片中的赝电容量子点

摘要 使用高压离子液体 (IL) 作为电解质组装超级电容器 (SCs) 是提高 SCs 能量密度的有效策略。在此，提出了一种新型赝电容量子点 (QD) 基电极，该电极在 IL 电解质中具有优异的电化学行为。值得注意的是，FeOOH QDs (FQDs) 被有效地限制在二维 (2D) 纳米空间中，该空间由源自石墨氮化碳 (g-C3N4) 的多孔 N 掺杂碳 (PNC) 支撑。得益于丰富的活性位点和高表面润湿性，所得的 FQDs/PNC 电极在 IL 电解质中表现出足够的氧化还原反应和有利的电化学动力学。因此，它可以提供 210.6 F g-1 的大比电容，并且在 10,000 次循环后仍保持其初始电容的 82.2%。