Integration of mesoporous nickel cobalt oxide nanosheets with ultrathin layer carbon wrapped TiO2 nanotube arrays for high-performance supercapacitors
Integration of mesoporous nickel cobalt oxide nanosheets with ultrathin layer carbon wrapped TiO2 nanotube arrays for high-performance supercapacitors
复制标题
介孔镍钴氧化物纳米片与超薄层碳包裹的 TiO2 纳米管阵列的集成用于高性能超级电容器
DOI：
10.1039/c6nj00359a
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发表时间：
2016
影响因子：
3.3
通讯作者：
Wu Yucheng
中科院分区：
文献类型：
--
作者：
Yu Cuiping;Wang Yan;Zhang Jianfang;Shu Xia;Cui Jiewu;Qin Yongqiang;Zheng Hongmei;Liu Jiaqin;Zhang Yong;Wu Yucheng
本文采用一种简单、绿色的工艺成功制备了超级电容器用修饰TiO 2纳米管阵列电极。首先，以阳极氧化后的乙二醇为碳源，通过原位热解法在TiO2纳米管阵列表面修饰上碳层，然后通过化学浴沉积和控制后煅烧工艺合成不同化学计量比的镍钴氧化物电活性材料.该样品在2 A g−1的电流密度下表现出934.9 F g−1的卓越比电容，在20 A g−1下表现出865.8 F g−1的更好倍率性能，同时在10 A g−1的高电流密度下5000次循环后仍保持92.6%的容量。突出的超级电容性能归因于独特的分级介孔结构和纳米复合材料的理想设计，并且它还表明用镍钴氧化物修饰的碳改性的TiO2纳米管阵列是超级电容器应用的有希望的候选者。
Decorated TiO2 nanotube array-based electrodes for supercapacitors are successfully fabricated by a facile and green process in this paper. Firstly, TiO2 nanotube arrays are modified with ultrathin carbon layers by in situ pyrolysis with residual ethylene glycol from anodization as a carbon resource, then electroactive materials, nickel cobalt oxides with different stoichiometric nickel and cobalt contents, are synthesized by chemical bath deposition and a controlled post-calcination process. The sample demonstrates a superb specific capacitance of 934.9 F g−1 at a current density of 2 A g−1 and a better rate capability of 865.8 F g−1 at 20 A g−1 while maintaining 92.6% capacity after 5000 cycles at a high current density of 10 A g−1. The outstanding supercapacitive performance is attributed to the unique hierarchical mesoporous architectures and the desirable design of the nanocomposites, and it also suggests that carbon modified TiO2 nanotube arrays decorated with nickel cobalt oxides are promising candidates for supercapacitor applications.