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影响氢化TiO纳米管阵列超级电容性能的一个重要因素：晶体结构。

An Important Factor Affecting the Supercapacitive Properties of Hydrogenated TiO Nanotube Arrays: Crystal Structure.

作者信息

Li Wenyi, Zhang Wanggang, Li Taotao, Wei Aili, Liu Yiming, Wang Hongxia

机构信息

Shanxi Key Laboratory of Advanced Magnesium-based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China.

Shanxi Academy of Analytical Sciences, Taiyuan, 030006, China.

出版信息

Nanoscale Res Lett. 2019 Jul 10;14(1):229. doi: 10.1186/s11671-019-3047-2.

DOI:10.1186/s11671-019-3047-2
PMID:31292810
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6620217/
Abstract

Employing a suitable crystal structure can significantly modify the electrochemical performances of materials. Herein, hydrogenated TiO nanotube arrays with <001> orientation and different rutile/anatase ratio were fabricated via anodisation, high-temperature annealing and electrochemical hydrogenation. The crystal structure was determined by TEM and X-ray diffraction pattern refinement of whole powder pattern fitting. Combined with the model of anatase to rutile transformation and the characterisation of crystal structure, the effect of phase transition on the super capacitive properties of <001> oriented hydrogenated TiO nanotube arrays was discussed. The results suggested that the anatase grains were characterised by orientation in <001> direction with plate crystallite and stacking vertically to the substrate resulting in excellent properties of electron/ion transport within hydrogenated TiO nanotube arrays. In addition, the specific capacitance of <001> oriented hydrogenated TiO could be further improved from 20.86 to 24.99 mF cm by the partial rutile/anatase transformation due to the comprehensive effects of lattice disorders and rutile, while the good rate performance and cyclic stability also retained.

摘要

采用合适的晶体结构可以显著改变材料的电化学性能。在此，通过阳极氧化、高温退火和电化学氢化制备了具有<001>取向且金红石/锐钛矿比例不同的氢化TiO纳米管阵列。通过透射电子显微镜（TEM）和全粉末图案拟合的X射线衍射图案精修确定晶体结构。结合锐钛矿向金红石转变模型和晶体结构表征，讨论了相变对<001>取向氢化TiO纳米管阵列超级电容性能的影响。结果表明，锐钛矿晶粒的特征是在<001>方向上取向，具有板状微晶并垂直于基底堆叠，从而在氢化TiO纳米管阵列内产生优异的电子/离子传输性能。此外，由于晶格无序和金红石的综合作用，通过部分金红石/锐钛矿转变，<001>取向氢化TiO的比电容可从20.86进一步提高到24.99 mF/cm²，同时还保留了良好的倍率性能和循环稳定性。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5714/6620217/7460637b3cd0/11671_2019_3047_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5714/6620217/1037a0c5dc51/11671_2019_3047_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5714/6620217/610f0372fff1/11671_2019_3047_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5714/6620217/a860aab12fbd/11671_2019_3047_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5714/6620217/31d4a6ed23c9/11671_2019_3047_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5714/6620217/002df4498b63/11671_2019_3047_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5714/6620217/3518f5fbdce0/11671_2019_3047_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5714/6620217/ad6d19fb1b5e/11671_2019_3047_Fig11_HTML.jpg
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