Abstract In this work, the capacitive deionization (CDI) behavior of mesoporous carbons (MCs) through direct carbonization of ZIF-8 at 1000 °C under Ar + 4%H 2 atmosphere has been explored. The obtained MCs exhibit a well-defined mesoporous structure, with a high specific surface area of 723.41 m 2 ·g − 1 and average pore diameter of 3.2 nm. The specific electrochemical capacitance of MCs was evaluated in a three-electrode configuration with 1 M NaCl electrolyte, showing that the capacitance reached as high as 215.72 F·g − 1 at the scan rate of 5 mV·s − 1 and 186 F·g − 1 with current density of 100 mA·g − 1 , respectively. Moreover, it is found that the electrosorption capacity of MCs was 4.8 mg·g − 1 in NaCl solutions with an initial concentration of 250 mg·L − 1 and cell voltage of 1.2 V. Remarkably, the theoretical maximum electrosorption capacity was estimated at 17 mg·g − 1 from Langmuir isotherm when the cell voltage was fixed at 1.2 V. Finally, the well regeneration of MCs electrode was demonstrated, indicating the great potential application of MCs in desalination.

中文翻译：

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来自 ZIF-8 的介孔碳用于高效电吸附

摘要 在这项工作中，通过在 Ar + 4%H 2 气氛下在 1000 °C 下直接碳化 ZIF-8，探索了介孔碳 (MCs) 的电容去离子 (CDI) 行为。获得的MCs表现出明确的介孔结构，具有723.41 m 2 ·g - 1 的高比表面积和3.2 nm的平均孔径。MCs 的比电化学电容在 1 M NaCl 电解质的三电极配置中进行评估，表明在 5 mV·s - 1 和 186 F·g 的扫描速率下电容高达 215.72 F·g - 1 − 1 分别具有100 mA·g − 1 的电流密度。此外，发现在初始浓度为 250 mg·L - 1 和电池电压为 1.2 V 的 NaCl 溶液中，MCs 的电吸附容量为 4.8 mg·g - 1。