Metal–organic framework (MOF) derived porous carbon materials have been widely applied as active materials for supercapacitors due to their large specific surface area and ordered pore structure. This paper presents a facile and effective strategy to regulate the morphology of a zinc-based metal–organic framework (Zn-trimesic acid, Zn-BTC) by adjusting the ethanol content in a solvent, which can effectively change the pore structure of Zn-BTC derived porous carbon (PC). The optimal PC prepared in 50% ethanol displays a rodlike structure with a large specific surface area (SSA) of 1930 m² g⁻¹ and an average pore size of 2.9 nm. This material shows an excellent rate performance with 78.8% capacitance retention when the current density increases from 1 A g⁻¹ to 100 A g⁻¹ and outstanding electrochemical stability with only 2.2% decline of capacitance after 200 000 cycles at 50 A g⁻¹. Moreover, the assembled symmetrical capacitor shows a high energy density of 16.09 W h kg⁻¹ at 698 W kg⁻¹ and 11.89 W h kg⁻¹ at a high power density of 41.56 kW kg⁻¹. This method would provide a new pathway for the preparation of carbon materials with an adjustable pore size for high-performance supercapacitors.

中文翻译：

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Zn-MOF衍生的分级碳材料的简便形态可调策略，通过溶剂效应增强超级电容性能

金属有机骨架（MOF）衍生的多孔碳材料由于其较大的比表面积和有序的孔结构而被广泛用作超级电容器的活性材料。本文提出了一种简便有效的策略，通过调节溶剂中的乙醇含量来调节锌基金属有机骨架（Zn-均苯三甲酸，Zn-BTC）的形貌，从而有效地改变 Zn- 的孔结构。 BTC衍生的多孔碳（PC）。^{在 50% 乙醇中制备的最佳 PC 显示出棒状结构，具有 1930 m 2} g ^-1的大比表面积 (SSA)和 2.9 nm 的平均孔径。当电流密度从 1 A g ^{−1增加时，该材料表现出优异的倍率性能，电容保持率为 78.8%}至 100 A g ^-1和出色的电化学稳定性，在 50 A g ^-1下经过 200 000 次循环后电容仅下降 2.2% 。此外，组装的对称电容器在 698 W kg ^{-1时显示出 16.09 W h kg -1}的高能量密度，在 41.56 kW kg ^-1的高功率密度下显示出 11.89 W h kg ^-1的高能量密度。该方法将为高性能超级电容器用可调孔径碳材料的制备提供新途径。