Carbonization and activation have been exploited as an economic and efficient approach toward the production of porous activated carbon monolith derived from green stem of cassava (GSC). In addition, ZnCl₂ was used as a chemical activator agent at various concentrations, therefore serving as a key factor in the development of porous carbon. The carbonization process (N₂) was integrated with physical activation (CO₂), and then N₂ sorption, scanning electron microscopy, X‐ray diffraction, energy dispersive X‐ray were examined to evaluate the specific surface area, pore structure characteristic, morphology structure, crystallinity, and the surface element, respectively. Furthermore, cyclic voltammetry was used to measure the electrochemical performance, through a two‐electrode system in 1M H₂SO₄. Therefore, the synthesized porous activated carbon exhibits a micropores‐mesopores combination, and the optimized sample demonstrated nanosheet and nanofiber structures. The results show a high electrochemical behavior in 1M H₂SO₄ electrolytes, by the electrodes, with specific capacitance, energy, and power densities of 164.58 F g⁻¹, 22.86 Wh kg⁻¹, and 82.38 W kg⁻¹, respectively. This route confirms the opportunity of using novel GSC in the production of porous carbon monolith with nanosheet/nanofiber structure for supercapacitor applications.

中文翻译：

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来源于木薯绿色茎的具有纳米片/纳米纤维结构的多孔活性炭整料，可用于超级电容器

碳化和活化已被开发为生产衍生自木薯绿色茎（GSC）的多孔活性炭整体的经济有效方法。另外，ZnCl ₂用作各种浓度的化学活化剂，因此成为多孔碳发展的关键因素。碳化过程（N ₂）与物理活化（CO ₂）集成在一起，然后N ₂对吸附，扫描电子显微镜，X射线衍射，能量色散X射线进行了检查，以分别评估比表面积，孔结构特征，形态结构，结晶度和表面元素。此外，循环伏安法通过在1M H ₂ SO _4中的双电极系统测量电化学性能。因此，合成的多孔活性炭表现出微孔-中孔的组合，优化的样品显示出纳米片和纳米纤维的结构。结果显示通过电极在1M H ₂ SO ₄电解质中具有较高的电化学行为，比电容，能量和功率密度为164.58 F g ^-1分别为22.86 Wh kg ^-1和82.38 W kg ^-1。这条路线证实了在具有超级电容器应用的具有纳米片/纳米纤维结构的多孔碳整料的生产中使用新型GSC的机会。