Hierarchical TiO 2 Photoanodes with Spatial Charge Separation for Efficient Oxygen Evolution Reaction
Hierarchical TiO 2 Photoanodes with Spatial Charge Separation for Efficient Oxygen Evolution Reaction
复制标题
DOI：
10.1002/solr.202000449
复制
发表时间：
2020-10
期刊：
影响因子：
--
通讯作者：
Guojun Dong;Xiang Cheng;Yingpu Bi
中科院分区：
文献类型：
--
作者：
Guojun Dong;Xiang Cheng;Yingpu Bi
电荷分离和转移是决定光电化学（PEC）水分解性能的关键。本文演示了一种自下而上的分层方法，用于用Au纳米层和sn3o4助催化剂制造tio2纳米棒阵列。在AM 1.5G辐照下，层次化Sn3O4/TiO2/Au光阳极的光电流密度显著提高，达到2.5 mA cm - 2at 1.23 vrheat，是原始TiO2（0.5 mA cm - 2at 1.23 VRHE）的5倍左右。Au纳米层与sn3o4助催化剂之间的空间电荷分离是其PEC性能显著增强的原因。更具体地说，底部的Au纳米层可以加速电子从tio2到氟掺杂二氧化锡（FTO）衬底的转移，表面的sn3o4纳米片可以有效地捕获空穴并为析氧反应提供丰富的活性位点。这些演示可能为合理设计和构建高效的TiO2基PEC太阳能水分解装置提供新的见解。
Charge separation and transfer are crucial to determine photoelectrochemical (PEC) water splitting performance. Herein, a hierarchical bottom‐up approach for fabricating TiO2nanorod arrays with an Au nanolayer and Sn3O4cocatalysts is demonstrated. The hierarchical Sn3O4/TiO2/Au photoanode exhibits a significantly enhanced photocurrent density of 2.5 mA cm−2at 1.23 VRHEunder AM 1.5G irradiation, which is about 5 times higher than that of pristine TiO2(0.5 mA cm−2at 1.23 VRHE). The significantly enhanced PEC properties are attributed to the spatial charge separation among Au nanolayer and Sn3O4cocatalysts. More specifically, the bottom Au nanolayer can accelerate the electron transfer from TiO2to fluorine doped tin dioxide (FTO) substrate, and the surface Sn3O4nanoflakes can effectively capture holes and provide abundant active sites for oxygen‐evolution reaction. These demonstrations may offer a new insight for rational design and construction of highly efficient TiO2‐based PEC devices for solar water splitting.