Phase and photoelectrochemical behavior of solution-processed Fe2O3 nanocrystals for oxidation of water under solar light

Pramod H. Borse; Hwichan Jun; Sun Hee Choi; Suk Joon Hong; Jae Sung Lee
October 2008
Applied Physics Letters;10/27/2008, Vol. 93 Issue 17, p173103
Academic Journal
Monodispersed iron-oxide nanocrystals of controlled sizes (5–16 nm) were prepared by the thermal decomposition of iron-oleate complex to fabricate photoanode films for photoelectrochemical oxidation of water under simulated solar light. The smallest 5 nm particles were made mostly of γ-Fe2O3, but other sizes showed mixed phases with Fe3O4, whose fraction increased with size. Size-dependent photoanodic currents were also observed, showing maximum photocurrent density for 12 nm particles. The high photocurrents were attributed to the lowered electron-hole recombination rates for the nanocrystals with the sizes comparable to the hole diffusion length.


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