Journal
NANOTECHNOLOGY
Volume 28, Issue 39, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aa7fda
Keywords
hematite; LaFeO3; water splitting; photoanode; charge separation efficiency
Funding
- National Basic Research Program of China (973 Program) [2013CB632404]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- National Natural Science Foundation of China [21073090, U1663228]
- Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University [ccsu-KF-1404]
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Many metal-oxide candidates for photoelectrochemical water splitting exhibit localized small polaron carrier conduction. Especially hematite (alpha-Fe2O3) photoanodes often suffer from low carrier mobility, which causes the serious bulk electron-hole recombination and greatly limits their PEC performances. In this study, the charge separation efficiency of hematite was enhanced greatly by coating an ultrathin p-type LaFeO3 overlayer. Compared to the hematite photoanodes, the solar water splitting photocurrent of the Fe2O3/LaFeO3 n-p junction exhibits a 90% increase at 1.23 V versus the reversible hydrogen electrode, due to enlarging the band bending and expanding the depletion layer.
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