黑茶茶梗衍生多孔碳的制备及其超级电容性能研究

Preparation of Porous Carbon Derived from Stem of Dark Tea and Its Superca-pacitor Performance

摘要: 本论文以黑茶茶梗为原料，先加入浓硫酸通过水热反应进行预炭化处理，再以氢氧化钾为化学活化剂，通过高温碳化，制备出由黑茶茶梗衍生的多孔活性炭。在实验中通过改变氢氧化钾与茶梗的质量比例，制得了三种不同的生物质衍生活性炭(DTS-AC-1、DTS-AC-2、DTS-AC-3)。通过扫描电子显微镜、X射线衍射和拉曼光谱分析表征了样品的形貌、结构和组成。将这三种材料分别制成电极研究其对称型超级电容器性能。通过电化学性能测试表明，DTS-AC-3具有最优的电化学性能。在1 A∙g−1的电流密度下，DTS-AC-3的比电容达到105.7 F∙g−1，可见黑茶茶梗衍生多孔碳作为超级电容器电极材料具有一定的应用潜力。

Abstract: In this paper, dark tea stalks are used as raw materials, and con-centrated sulfuric acid is added to conduct pre-carbonization treatment through hydrothermal re-action, and then potassium hydroxide is used as a chemical activator to prepare porous activated carbon derived from black tea stalks through high-temperature carbonization. In the experiment, three different biomass- derived activated carbons (DTS-AC-1, DTS-AC-2, DTS-AC-3) were prepared by changing the mass ratio of potassium hydroxide to tea stems. The morphology, structure and properties of the samples were characterized by XRD, SEM, BET and Raman analysis. The three materials were made into electrodes to study their symmetrical supercapacitor performance. The electrochemical performance test shows that DTS-AC-3 has the best electrochemical performance. At a current density of 1 A∙g−1, the specific capacitance reached 105.7 F∙g−1. It can be seen that the black tea stem-derived porous carbon has a certain application potential as an electrode material.