Abstract The present study reports the preparation of naturally nitrogen-doped carbon nanostructured materials from Albizia procera leaves with enhanced electrochemical supercapacitance properties. The doped carbon materials were prepared by the pyrolysis of Albizia procera leaves at 850 °C. The effect of using various activating agents such as NaHCO3 and ZnCl2 was checked and compared on the structural and textural properties, specific capacitance, surface functional groups, and surface area. The Brunauer–Emmett–Teller (BET) analysis shows that NaHCO3-activated nitrogen-doped carbon (NaNC) has a higher specific surface area compare to ZnCl2-activated nitrogen-doped carbon (ZnNC) and nitrogen-doped carbon prepared without an activating agent (WANC). Overall, the BET and microscopic analyses confirmed that NaNC is composed of carbon nanosheets with macropores and mesopores, as well as a large number of micropores, which is completely different from the composition of ZnNC and WANC. In addition, the XPS analysis confirmed the existence of higher amount of nitrogen in NaNC compared to that of ZnNC, and WANC. NaNC exhibits a specific capacitance of 231 F g−1 at 1 A g−1 current with good energy and power densities, and an outstanding charging-discharging stability thanks to its unique features such as the existence of high amounts of nitrogen, high SSA, and the nanosheet-type morphology.

中文翻译：

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活化剂对合欢叶天然富氮碳理化性质和超级电容器性能的影响

摘要 本研究报道了从合欢叶中制备具有增强电化学超级电容特性的天然掺氮碳纳米结构材料。掺杂的碳材料是由合欢叶在 850 °C 下热解制备的。检查并比较了使用各种活化剂（如 NaHCO3 和 ZnCl2）对结构和质地特性、比电容、表面官能团和表面积的影响。Brunauer-Emmett-Teller (BET) 分析表明，与 ZnCl2 活化的氮掺杂碳 (ZnNC) 和未使用活化剂制备的氮掺杂碳相比，NaHCO3 活化的氮掺杂碳 (NaNC) 具有更高的比表面积(WANC)。全面的，BET和显微分析证实，NaNC由具有大孔和中孔以及大量微孔的碳纳米片组成，这与ZnNC和WANC的组成完全不同。此外，XPS 分析证实，与 ZnNC 和 WANC 相比，NaNC 中存在更多的氮。NaNC 在 1 A g-1 电流下表现出 231 F g-1 的比电容，具有良好的能量和功率密度，并且由于其独特的特性，例如存在大量氮、高 SSA、和纳米片型形态。XPS 分析证实，与 ZnNC 和 WANC 相比，NaNC 中存在更多的氮。NaNC 在 1 A g-1 电流下表现出 231 F g-1 的比电容，具有良好的能量和功率密度，由于其独特的特性，如存在大量的氮、高 SSA、和纳米片型形态。XPS 分析证实，与 ZnNC 和 WANC 相比，NaNC 中存在更多的氮。NaNC 在 1 A g-1 电流下表现出 231 F g-1 的比电容，具有良好的能量和功率密度，由于其独特的特性，如存在大量的氮、高 SSA、和纳米片型形态。