https://scholars.lib.ntu.edu.tw/handle/123456789/406446
標題: | Synthesis, characterization and enhanced photocatalytic CO 2 reduction activity of graphene supported TiO 2 nanocrystals with coexposed {001} and {101} facets | 作者: | Xiong Z. Luo Y. Zhao Y. Zhang J. Zheng C. Wu J.C.S. |
公開日期: | 2016 | 卷: | 18 | 期: | 19 | 起(迄)頁: | 13186-13195 | 來源出版物: | Physical Chemistry Chemical Physics | 摘要: | It is known that the combination of TiO 2 and graphene and the control of TiO 2 crystal facets are both effective routes to improve the photocatalytic performance of TiO 2 . Here, we report the synthesis and the photocatalytic CO 2 reduction performance of graphene supported TiO 2 nanocrystals with coexposed {001} and {101} facets (G/TiO 2 -001/101). The combination of TiO 2 and graphene enhanced the crystallinity of TiO 2 single nanocrystals and obviously improved their dispersion on graphene. The "surface heterojunction" formed by the coexposed {001} and {101} facets can promote the spatial separation of photogenerated electrons and holes toward different facets and the supports of graphene can further enhance the separation through accelerated electron migration from TiO 2 to graphene. The G/TiO 2 -001/101 exhibited high photocatalytic CO 2 -reduction activity with a maximum CO yield reaching 70.8 £gmol g -1 h -1 . The enhanced photocatalytic activity of the composites can be attributed to their high surface area, good dispersion of TiO 2 nanoparticles, and effective separation of excited charges due to the synergy of graphene supports and the co-exposure of {001} and {101} facets. ? the Owner Societies 2016. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/406446 | ISSN: | 14639076 | DOI: | 10.1039/c5cp07854g |
顯示於: | 化學工程學系 |
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