Nitrogen-Doped Carbon Nanocoil Array Integrated on Carbon Nanofiber Paper for Supercapacitor Electrodes
Nitrogen-Doped Carbon Nanocoil Array Integrated on Carbon Nanofiber Paper for Supercapacitor Electrodes
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DOI：
10.1021/acsami.5b05527
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发表时间：
2015-09-02
影响因子：
9.5
通讯作者：
Bang, Jin Ho
中科院分区：
文献类型：
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作者：
Choi, Won Ho;Choi, Mi Jin;Bang, Jin Ho
在导电衬底上集成纳米结构碳阵列仍然是一项具有挑战性的任务，目前主要依赖高真空沉积技术。为了克服与当前真空技术相关的问题，我们演示了通过热解在碳纤维纸上电化学生长的聚合物阵列来形成N掺杂的碳阵列。所得到的碳阵列被用作超级电容器电极。深入的表面表征结果表明，通过控制碳化温度，可以很好地控制N掺杂碳阵列的微观织构性质、表面官能度和氮的掺杂度。此外，电化学测试表明，这些物理性质的细微变化导致了N掺杂碳阵列电容行为的显著变化。在较低的碳化温度下，形成了有利于电荷储存的孔结构和氮氧官能团。这一结果表明了全面了解碳的表面特征如何影响其电容性能的重要性。当被用作伪电容电极材料的衬底时，由于其大的表面积和高的导电性，N掺杂的碳阵列通过同时获得高的重量和面积电容来最大化电容性能。
Integrating a nanostructured carbon array on,a conductive substrate remains a challenging task that presently relies primarily on high-vacuum deposition technology. To overcome the problems associated with current vacuum techniques, we demonstrate the formation of an N-doped carbon array by pyrolysis of a polymer array that was electrochemically grown on carbon fiber paper. The resulting carbon array was investigated for use as a supercapacitor electrode. In-depth surface characterization results revealed that the microtextural properties, surface functionalities, and degree of nitrogen incorporated into the N-doped carbon array can be delicately controlled by manipulating carbonization temperatures. Furthermore, electrochemical measurements showed that subtle changes in these physical properties resulted in significant changes in the capacitive behavior of the N-doped carbon array. Pore structures and nitrogen/oxygen functional groups, which are favorable for charge storage, were formed at low carbonization temperatures. This result showed the importance of having a comprehensive understanding of how the surface characteristics of carbon affect its capacitive performance. When utilized as a substrate in a pseudocapacitive electrode material, the N-doped carbon array maximizes capacitive performance by simultaneously achieving high gravimetric and areal capacitances due to its large surface area and high electrical conductivity.