Hierarchical porous carbon prepared with calcium-containing nanocrystalline beta zeolite as the template and ethylene as the carbon source at a relatively low carbonization temperature (600 °C) displayed excellent electrocapacitive properties. The presence of both micro/mesopores and surface oxygen-containing groups on the ordered porous structure, along with a high specific surface area (2280 m² g⁻¹) and pore volume (1.95 cm³ g⁻¹) coupled with good wettability towards the electrolyte enabled the carbon to perform well as a supercapacitor electrode. This carbon electrode achieved a specific capacitance of 250 F g⁻¹ at a current density of 1 A g⁻¹ with 1 M H₂SO₄ as the aqueous electrolyte measured in a three-electrode system. A symmetric capacitor fabricated with the carbon as both electrodes exhibited a specific capacitance of 161 F g⁻¹ at a current density of 1 A g⁻¹, and an excellent cycling stability. After being cycled 17 000 times and shelved for another two months, the electrode exhibited a specific capacitance of 246 F g⁻¹ at 1 A g⁻¹, 153% of the initial capacitance, and still maintained an excellent cycle stability. Besides, an all-solid-state supercapacitor cell fabricated with this carbon as both electrodes and polyvinyl alcohol/H₂SO₄ gel as the electrolyte displayed an areal specific capacitance of 413 mF cm⁻² at a current density of 0.25 mA cm⁻².

中文翻译：

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用于高性能超级电容器的沸石模板纳米多孔碳†

在相对较低的碳化温度（600°C）下，以含钙纳米晶β沸石为模板，以乙烯为碳源制备的多级多孔碳表现出优异的电电容性能。在有序的多孔结构上同时存在微孔/中孔和表面含氧基团，以及高比表面积（2280 m ² g ^-1）和孔体积（1.95 cm ³ g ^-1），以及对硅的良好润湿性电解质使碳能够用作超级电容器电极。该碳电极在1 MH ₂和1 A g ^-1的电流密度下实现了250 F g ^-1的比电容。在三电极系统中测量的SO ₄作为水性电解质。用碳作为两个电极制造的对称电容器在电流密度为1 A g ^-1时显示出161 F g ^-1的比电容，并且具有出色的循环稳定性。在循环17000次并搁置另外两个月后，该电极在1 A g ^-1处表现出246 F g ^-1的比电容，是初始电容的153％，并且仍保持了出色的循环稳定性。此外，以该碳作为电极和聚乙烯醇/ H ₂ SO ₄制成的全固态超级电容器电池作为电解质的凝胶在电流密度为0.25 mA cm ^-2时显示出413 mF cm ^-2的面积比电容。