Effects of size on the photocatalytic properties of high-index faceted pseudocubic and rhombohedral alpha-Fe2O3 nanocrystals
RSC ADVANCES(2019)
Abstract
Size-controlled and high-index faceted alpha-Fe2O3 nanocrystals with pseudocubic and rhombohedral morphologies were synthesized through the hydrothermal treatment of beta-FeOOH at different pHs. The size effect on the photocatalytic oxygen evolution efficiency of high-index faceted alpha-Fe2O3 nanocrystals was investigated. Rhombohedral alpha-Fe2O3 (pH 6.0) exhibits an outstanding apparent quantum yield of 9.93% and an oxygen evolution efficiency of 20.3%, which can be attributed to the optimal size and high-indexed {104} planes. This work provides a new idea for the design of high activity water oxidation catalysts, through the size optimization of high-index faceted materials.
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Key words
photocatalytic properties,nanocrystals,faceted pseudocubic,high-index
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