標題: Nb-Doped Hematite Nanorods for Efficient Solar Water Splitting: Electronic Structure Evolution versus Morphology Alteration
作者: Fu, Yanming
Dong, Chung-Li
Lee, Wan-Yi
Chen, Jie
Guo, Penghui
Zhao, Liang
Shen, Shaohua
電子物理學系
Department of Electrophysics
關鍵字: doping;hematite;photoanodes;photoelectrochemical;water splitting
公開日期: Jul-2016
摘要: In this study, Nb-doped alpha-Fe2O3 nanorod photoanodes were prepared via a facile solution-based process by directly adding NbCl5 in the aqueous solution. The morphology and electronic structure of Nb-doped alpha-Fe2O3 films depended strongly on the dopant concentrations. Compared with the undoped sample, the optimal Nb-doped alpha-Fe2O3 film showed an approximately 4-fold photocurrent increase under solar light at 1.0 V versus Ag/AgCl, and the incident photon-to-current conversion efficiency was increased by 2.5 times, reaching 13.7% at 350 nm and 1.23 V versus RHE. The enhancement in PEC activity, as induced by moderate Nb doping, was attributed to the increased charge carrier density for promoted charge transfer ability as well as the smaller nanorod diameter for shortened charge transfer distance. However, superfluous Nb dopants would destroy the nanorod structure and greatly reduce the thickness of alpha-Fe2O3 films, leading to poor optical absorption and thus decreased photoelectrochemical performance.
URI: http://dx.doi.org/10.1002/cnma.201600024
http://hdl.handle.net/11536/132569
DOI: 10.1002/cnma.201600024
期刊: CHEMNANOMAT
Volume: 2
Issue: 7
起始頁: 704
結束頁: 711
Appears in Collections:Articles