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作 者:郭淑青 董向元 张恒瑞 GUO Shuqing;DONG Xiangyuan;ZHANG Hengrui(School of Energy and Power Engineering,Nanjing Institute of Technology,Nanjing 211167,China)
机构地区:[1]南京工程学院能源与动力工程学院,南京211167
出 处:《农业机械学报》2021年第4期336-341,共6页Transactions of the Chinese Society for Agricultural Machinery
基 金:国家自然科学基金项目(51206194);南京工程学院引进人才科研启动基金项目(YKJ201811、YKJ201812)。
摘 要:为研究榴莲壳水热焦作为电极材料的性能,以榴莲壳为原料,在250℃、10 h和液固比为10 g/g的条件下,通过一步水热炭化将其制备成水热焦,并分析了水热焦的元素组成、结构特性及其作为电极材料的电化学性能。结果表明,榴莲壳水热焦C质量分数高达70.29%,O质量分数低至16.96%,表面含有丰富的含氧官能团,水热焦中的C主要呈无定形结构,部分接近天然石墨结构;水热焦表面粗糙、分布着尺寸不同的孔隙,多点BET比表面积为38.74 m^(2)/g,平均孔径4.67 nm;在6 mol/L KOH作为电解质的三电极系统中,以水热焦作为工作电极的循环伏安曲线对称,且近似矩形,说明水热焦中含杂原子的官能团提供了部分赝电容,恒电流充放电曲线近似为三角形,1 A/g时比电容为344.83 F/g;交流阻抗曲线在低频区呈陡直的斜线,说明榴莲壳水热焦具有良好的电性能和循环稳定性,可用于超级电容器电极材料和低成本的储能材料。Hydrochar from hydrothermal carbonization of biomass are regarded as one of the most promising electrode materials for supercapacitors owing to its low-cost,high carbon content and porosity.However,there were few studies on durian shell hydrochar via hydrothermal carbonization as a high-value porous carbon material. In order to explore the performance of durian shell hydrochar as electrode material,the hydrochar was prepared from durian shell via one-step hydrothermal carbonzation process at250℃,10 h and liquid-solid ratio of 10 g/g. The elemental composition,structural characteristics and electrochemical properties of the hydrochar were analyzed. The results showed that the C content of the hydrochar was 70. 29% and its O content was 16. 96%. There were abundant oxygen-containing functional groups on the surface of durian shell hydrochar. The prepared hydrochar contained appreciable amount of amorphous carbon,and some were close to graphitization. Moreover,the hydrochar exhibited a BET specific surface area of 38. 74 m^(2)/g and an average pore size of 4. 67 nm. In a three electrode system with 6 mol/L KOH as electrolyte,the cyclic voltammetry curve of the hydrochar prepared as working electrode presented a symmetrical rectangular shape. The partial pseudo capacitance was provided by the functional groups containing heteroatoms. The galvanostatic charge-discharge curve approximately presented triangle shape. Durian shell hydrochar exhibited a high specific capacitance of 344. 83 F/g at1 A/g and good rate performance. The electrochemical impedance curve showed a steep slope in the low frequency region,which showed good electrical properties and certain cycle stability. The achieved electrochemical performance demonstrated that durian shell hydrochar could be used as electrode materials for supercapacitors and low-cost energy storage materials.
分 类 号:S216[农业科学—农业机械化工程]
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