Wang Yang, Liu Xueqin, Li Zhen, Cao Ya, Li Yinchang, Liu Xupo, Jia Songru, Zhao Yanli
Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, P. R. China.
Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore.
Small. 2017 Jul;13(28). doi: 10.1002/smll.201700793. Epub 2017 May 30.
Achieving efficient charge transport is a great challenge in nanostructured TiO -electrode-based photoelectrochemical cells. Inspired by excellent directional charge transport and the well-known electroconductibility of 1D anatase TiO nanostructured materials and graphene, respectively, planting ordered, single-crystalline anatase TiO nanorod clusters on graphene sheets (rGO/ATRCs) via a facial one-pot solvothermal method is reported. The hierarchical rGO/ATRCs nanostructure can serve as an efficient light-harvesting electrode for dye-sensitized solar cells. In addition, the obtained high-crystallinity anatase TiO nanorods in rGO/ATRCs possess a lower density of trap states, thus facilitating diffusion-driven charge transport and suppressing electron recombination. Moreover, the novel architecture significantly enhances the trap-free charge diffusion coefficient, which contributes to superior electron mobility properties. By virtue of more efficient charge transport and higher energy conversion efficiency, the rGO/ATRCs developed in this work show significant advantages over conventional rGO-TiO nanoparticle counterparts in photoelectrochemical cells.
在基于纳米结构二氧化钛电极的光电化学电池中，实现高效的电荷传输是一项巨大的挑战。分别受一维锐钛矿型二氧化钛纳米结构材料出色的定向电荷传输以及石墨烯广为人知的导电性启发，本文报道了通过一种简便的一锅溶剂热法在石墨烯片上生长有序的单晶锐钛矿型二氧化钛纳米棒簇（rGO/ATRCs）。这种分级的rGO/ATRCs纳米结构可作为染料敏化太阳能电池的高效光捕获电极。此外，在rGO/ATRCs中获得的高结晶度锐钛矿型二氧化钛纳米棒具有较低的陷阱态密度，从而有利于扩散驱动的电荷传输并抑制电子复合。而且，这种新型结构显著提高了无陷阱电荷扩散系数，这有助于实现优异的电子迁移率特性。凭借更高效的电荷传输和更高的能量转换效率，本文所制备的rGO/ATRCs在光电化学电池中比传统的rGO-二氧化钛纳米颗粒对应物具有显著优势。
