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首页> 外文期刊>Applied Surface Science >Facile preparation of nitrogen-doped high-surface-area porous carbon derived from sucrose for high performance supercapacitors
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Facile preparation of nitrogen-doped high-surface-area porous carbon derived from sucrose for high performance supercapacitors

机译：蔗糖衍生的氮掺杂高表面积多孔碳的制备方法，用于高性能超级电容器

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摘要

We propose a simple strategy that combines polymerization with chemical activation to prepare a new high-surface-area nitrogen-doped porous carbon (SU-NPC) using sucrose as a carbon precursor, urea as a nitrogen precursor and KOH as an activation reagent. Additionally, this method avoids the time-consuming and complex hydrothermal treatment and template method of traditional approaches. To further optimize the performance, we investigated the relationship between the structure of the SU-NPC-X (X is the activation temperature) and its electrochemical performance at different activation temperatures in detail. The as-prepared SU-NPC-750 not only featured a large specific surface area of 1751 m(2) g(-1) with a microporous network but also possessed a 5.96% nitrogen content. In 6 M KOH, the SU-NPC-750 displayed the highest specific capacitance of 335F g(-1) at 1A g(-1) among all previously reported sucrose-derived porous carbon. Meanwhile, the SU-NPC-750 presents an outstanding rate performance with a 65% capacitance retention at 30 A g(-1) and an excellent cycling stability with an approximately 95.5% capacitance retention over 10,000 cycles. Moreover, the as-assembled symmetrical capacitor showed a high energy density of 14.1 Wh kg(-1). Therefore, the porous carbon materials described in this study are promising candidate electrode materials for supercapacitors.
机译：我们提出一种简单的策略，将聚合与化学活化相结合，以蔗糖为碳前驱体，尿素为氮前驱体和KOH作为活化剂来制备新的高表面积掺氮多孔碳（SU-NPC）。另外，该方法避免了传统方法的费时且复杂的水热处理和模板方法。为了进一步优化性能，我们详细研究了SU-NPC-X的结构（X是活化温度）与其在不同活化温度下的电化学性能之间的关系。所制备的SU-NPC-750不仅具有大的比表面积1751 m（2）g（-1）和微孔网络，而且具有5.96％的氮含量。在6 M KOH中，SU-NPC-750在所有先前报道的蔗糖衍生多孔碳中显示出在1A g（-1）时最高的335F g（-1）的比电容。同时，SU-NPC-750具有出色的速率性能，在30 A g（-1）时的电容保持率为65％，在10,000次循环中的电容保持率约为95.5％，具有出色的循环稳定性。此外，组装后的对称电容器显示出14.1 Wh kg（-1）的高能量密度。因此，本研究中描述的多孔碳材料是有希望用于超级电容器的候选电极材料。

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