Electrochemical behaviour of activated carbons obtained via hydrothermal carbonization
Electrochemical behaviour of activated carbons obtained via hydrothermal carbonization
复制标题
DOI：
10.1039/c5ta03574k
复制
发表时间：
2015-07
影响因子：
--
通讯作者：
D. Salinas-Torres;D. Lozano‐Castelló;M. Titirici;Li Zhao;Linghui Yu;E. Morallón;D. Cazorla-Amorós
中科院分区：
文献类型：
--
作者：
D. Salinas-Torres;D. Lozano‐Castelló;M. Titirici;Li Zhao;Linghui Yu;E. Morallón;D. Cazorla-Amorós
活性炭是通过水热炭的化学活化来制备的，水热炭是使用低成本且丰富的前体（例如黑麦秸秆和纤维素）与 KOH 通过水热碳化 (HTC) 获得的。使用不同的 KOH/前体比例对源自黑麦秸秆的水炭进行化学活化，以评估该参数对其电化学行为的影响。对于纤维素，通过固定活化剂/纤维素比率来研究水热碳化温度的影响。此外，通过 KOH 活化 HTC 从葡萄糖与三聚氰胺或葡萄糖胺的混合物中制备的氢炭来合成 N 掺杂活性炭。通过这种方式制备了氮掺杂活性炭，以评估氮基团对其在酸性介质中电化学行为的影响。结果表明，化学活化或碳化温度等参数明显影响电容，因为这些参数在活性炭的结构特性中起着关键作用。最后，基于活性炭和 N 掺杂活性炭的对称电容器在两电极电池配置中在 1.3 V 下进行了测试，结果表明 N 基团提高了高电流密度下的电容。
Activated carbons were prepared by chemical activation of hydrochars, obtained by hydrothermal carbonisation (HTC) using low cost and abundant precursors such as rye straw and cellulose, with KOH. Hydrochars derived from rye straw were chemically activated using different KOH/precursor ratios, in order to assess the effect of this parameter on their electrochemical behaviour. In the case of cellulose, the influence of the hydrothermal carbonisation temperature was studied by fixing the activating agent/cellulose ratio. Furthermore, N-doped activated carbons were synthesised by KOH activation of hydrochars prepared by HTC from a mixture of glucose with melamine or glucosamine. In this way, N-doped activated carbons were prepared in order to evaluate the influence of nitrogen groups on their electrochemical behaviour in acidic medium. The results showed that parameters such as chemical activation or carbonisation temperature clearly affect the capacitance, since these parameters play a key role in the textural properties of activated carbons. Finally, symmetric capacitors based on activated carbon and N-doped activated carbon were tested at 1.3 V in a two-electrode cell configuration and the results revealed that N-groups improved the capacitance at high current density.