Enhancement of the electrochemical capacitance of TiOF₂ obtained via control of the crystal structure

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• 作者：Min-Jung Jung ; Yesol Kim ; Young-Seak Lee ; ^{youngslee@cnu.ac.kr}
• 关键词：TiOF2 ; NF3 ; Crystal structure ; Electrochemical capacitance
• 刊名：Journal of Industrial and Engineering Chemistry
• 出版年：2017
• 出版时间：25 March 2017
• 年：2017
• 卷：47
• 期：Complete
• 页码：187-193
• 全文大小：1690 K
• 卷排序：47

文摘

TiOF2 was successfully prepared as an electrochemical capacitor electrode material by novel method, which is NF3 treatment of a TiO2 precursor at controlled reaction temperatures to modulate its structure and surface properties. The crystal phase of TiOF2 changed to fluorine-doped anatase TiO2 upon increasing the NF3 treatment temperature. This structural change was induced to reduce the Ti3+ ratio of the TiOF2 surface. The specific capacitance of the TiOF2 phase treated by fluorination with NF3 gas at 580 °C was sevenfold higher than that of anatase TiO2 in this study. The enhanced capacitance of TiOF2 is expected to lead to a higher conductivity and charge transfer of the TiOF2 phase in comparison to anatase TiO2, which is primarily attributed to the higher Ti3+ ratio.