Porous carbons are considered as promising electrode materials for supercapacitors due to their excellent microstructural properties. Synthesizing porous carbon from a bio-waste material has received significant importance due to their natural abundance and low-cost. Here we report the synthesis of porous carbon from a bio-waste, sweet corn husk precursor. Influence of morphology and crystallinity of pre-activated carbon on the microstructural properties of the resultant activated carbons are studied. The chemical activation method results in carbon with turbostratic nature, high specific surface area (1370 m² g^-1) with large mesoporous volume fraction and 2D layered-like morphology. Similar specific surface area is observed for samples prepared with the variation in the amount of activating agent due to higher pre-carbonization temperature. The resultant activated carbon (ASCH-1:1) shows a specific capacitance of 127 F g⁻¹ with low energy density (4.4 Wh kg⁻¹) in 6 M KOH electrolyte. A high energy density of 20 Wh kg⁻¹ is obtained in 1 M TEABF₄/AN electrolyte with a high specific capacitance of 80 F g⁻¹ at 1 A g⁻¹. It shows good cyclic stability by retaining 90% of initial capacitance after 5000 cycles at 2 A g⁻¹. Our results demonstrate that activated carbons reported here are promising materials for high operating voltage supercapacitors.

多孔碳由于其优异的微观结构特性而被认为是超级电容器的有希望的电极材料。由生物废料合成多孔碳由于其天然的丰富性和低成本而受到了极大的重视。在这里，我们报道了由生物废料，甜玉米壳前体合成多孔碳的过程。研究了预活性炭的形态和结晶度对所得活性炭微观结构性能的影响。化学活化法产生具有涡轮层性质的碳，高比表面积（1370 m ²  g ^-1），具有较大的中孔体积分数和2D层状形态。对于由于较高的预碳化温度而使活化剂的量变化而制备的样品，观察到了相似的比表面积。所得的活性炭（ASCH-1：1 ）在6 M KOH电解质中具有低能量密度（4.4 Wh kg ^-1）的127 F g ^-1的比电容。在1 M TEABF ₄ / AN电解质中，在1 A g ^-1处具有80 F g ^-1的高比电容，可获得20 Wh kg ^-1的高能量密度。通过在2 A g ^-1下进行5000次循环后保留90％的初始电容，它显示出良好的循环稳定性。我们的结果表明，此处报道的活性炭是用于高工作电压超级电容器的有前途的材料。