A series of γ-graphyne/TiO₂ nanotube array heterostructures are first synthesized by a facile and environmental-friendly drop-coating method. The prepared heterostructures is completely investigated by a collection of characterizations. Interestingly, the unique C-O-Ti linkage between γ-graphyne and TiO₂ nanotube arrays is verified by both X-ray photoelectron spectroscopy and Fourier transform infrared analysis. After modification of γ-graphyne, the maximum transient photo-current and photo-potential of TiO₂ nanotube arrays are improved by 2.2 and 1.3 folds, respectively. Moreover, a maximum of 3.64 and 1.35 folds enhancements are severally verified for the photoelectrocatalytic degradation of levofloxacin and rhodamine B over the heterostructures compared to that of TiO₂ nanotube arrays. Furtherly, the heterostructures also show superior photoelectrocatalytic performance on nitrogen fixation and oxygen evolution than TiO₂ nanotube arrays. The crystal, morphological, photoelectrochemical, and photoelectrocatalytic stability of the heterostructures are confirmed. This work sheds light on designing γ-graphyne modified composites for photoelectrochemical and photoelectrocatalytic application.

首先通过简便，环保的滴涂法合成了一系列γ-石墨烯/ TiO ₂纳米管阵列异质结构。准备的异质结构通过一系列特征进行了全面研究。有趣的是，通过X射线光电子能谱和傅立叶变换红外分析都证实了γ-石墨烯和TiO ₂纳米管阵列之间独特的CO-Ti键。修饰γ-石墨烯后，TiO ₂的最大瞬态光电流和光势纳米管阵列分别提高了2.2倍和1.3倍。此外，与TiO ₂纳米管阵列相比，左氧氟沙星和若丹明B在异质结构上的光电催化降解最多可提高3.64倍和1.35倍。此外，与TiO ₂纳米管阵列相比，异质结构在固氮和析氧方面也表现出优异的光电催化性能。证实了异质结构的晶体，形态，光电化学和光电催化稳定性。这项工作为设计用于光电化学和光催化应用的γ-石墨烯改性复合材料提供了启示。