Wang Zhiwei, Li Xianglin, Ling Han, Tan Chiew Kei, Yeo Loo Pin, Grimsdale Andrew Clive, Tok Alfred Iing Yoong
School of Material Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
Small. 2018 May;14(20):e1800395. doi: 10.1002/smll.201800395. Epub 2018 Apr 17.
A 3D fluorine-doped SnO (FTO)/FTO-nanocrystal (NC)/TiO inverse opal (IO) structure is designed and fabricated as a new "host and guest" type of composite photoanode for efficient photoelectrochemical (PEC) water splitting. In this novel photoanode design, the highly conductive and porous FTO/FTO-NC IO acts as the "host" skeleton, which provides direct pathways for faster electron transport, while the conformally coated TiO layer acts as the "guest" absorber layer. The unique composite IO structure is fabricated through self-assembly of colloidal spheres template, a hydrothermal method and atomic layer deposition (ALD). Owing to its large surface area and efficient charge collection, the FTO/FTO-NC/TiO composite IO photoanode shows excellent photocatalytic properties for PEC water splitting. With optimized dimensions of the SnO nanocrystals and the thickness of the ALD TiO absorber layers, the 3D FTO/FTO-NC/TiO composite IO photoanode yields a photocurrent density of 1.0 mA cm at 1.23 V versus reversible hydrogen electrode (RHE) under AM 1.5 illumination, which is four times higher than that of the FTO/TiO IO reference photoanode.
设计并制备了一种三维氟掺杂氧化锡（FTO）/FTO纳米晶体（NC）/二氧化钛反蛋白石（IO）结构，作为一种新型的“主客体”型复合光阳极用于高效光电化学（PEC）水分解。在这种新型光阳极设计中，高导电性且多孔的FTO/FTO-NC IO充当“主体”骨架，为更快的电子传输提供直接路径，而 conformal涂覆的TiO层充当“客体”吸收层。独特的复合IO结构通过胶体球模板的自组装、水热法和原子层沉积（ALD）制备而成。由于其大表面积和高效的电荷收集，FTO/FTO-NC/TiO复合IO光阳极在PEC水分解中表现出优异的光催化性能。通过优化SnO纳米晶体的尺寸和ALD TiO吸收层的厚度，三维FTO/FTO-NC/TiO复合IO光阳极在AM 1.5光照下，相对于可逆氢电极（RHE）在1.23 V时产生的光电流密度为1.0 mA cm，这比FTO/TiO IO参考光阳极高出四倍。
