文献类型：期刊文献

英文题名：Construction of WO3 quantum dots/TiO2 nanowire arrays type II heterojunction via electrostatic self-assembly for efficient solar-driven photoelectrochemical water splitting

作者：Zhang, Ning[1,2,4];Li, Huili[3];Yao, Bo[1];Liu, Shiyan[1];Ren, Jun[1];Wang, Yawei[5];Fang, Zebo[1];Wu, Rong[2,4];Wei, Shunhang[1]

机构：[1]Shaoxing Univ, Zhejiang Engn Res Ctr MEMS, Shaoxing 312000, Peoples R China;[2]Xinjiang Univ, Sch Phys Sci & Technol, Urumqi 830000, Xinjiang, Peoples R China;[3]Shanghai Normal Univ, Coll Chem & Mat Sci, Shanghai 200234, Peoples R China;[4]Xinjiang Univ, Xinjiang Key Lab Solid State Phys & Devices, Urumqi 830000, Xinjiang, Peoples R China;[5]Jiujiang Univ, Sch Chem & Chem Engn, Jiujiang 332005, Peoples R China

年份：2023

卷号：52

期号：19

起止页码：6284

外文期刊名：DALTON TRANSACTIONS

收录：SCI-EXPANDED(收录号：WOS:000971498600001)、、WOS

基金：This work was supported by National Natural Science Foundation of China (Grant no. 51872186, 22066024, 52062023), Zhejiang Province Public Welfare Technology Application Research Project (Grant No. LGG21F050001).

语种：英文

外文关键词：Charge transfer - Electrochemistry - Electrostatics - Heterojunctions - Nanocrystals - Nanowires - Self assembly - Semiconductor quantum dots - Tungsten compounds

外文摘要：Construction of a heterojunction between quantum dots and TiO2 nanowire arrays via electrostatic self-assembly is rarely reported. In this work, mercury lamp irradiation was used to change the surface potential of WO3 quantum dots and TiO2 nanowire arrays, resulting in WO3 quantum dots tightly attached on the surface of TiO2 nanowire through electrostatic self-assembly. Photoelectrochemical measurements showed that the WO3 quantum dots formed a type II heterojunction with the TiO2 nanowire arrays rather than serving as carrier-trapping sites. In the self-assembly system, the TiO2 nanowire arrays provide a charge-transfer channel for the WO3 quantum dots, greatly improving the contribution of the WO3 quantum dots to the photocurrent. Quantitative calculations showed that the improvement of the bulk carrier-separation efficiency was the reason for the enhanced photoelectrochemical performance of the self-assembled system. The photocurrent density of the optical self-assembled system at 1.23 V (vs. RHE) was similar to 5.5 times as high as that of the TiO2 nanowire arrays. More importantly, the self-assembled system exhibited excellent photoelectrochemical stability.