Investigation of porosity and heterojunction effects of a mesoporous hematiteelectrode on photoelectrochemical water splitting

Literature Information

Publication Date 2013-04-22
DOI 10.1039/C3CP51053K
Impact Factor 3.676
Authors

Jingling Liu, Muhammad Shahid, Young-Seon Ko, Eunchul Kim, Tae Kyu Ahn, Jong Hyeok Park


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Abstract

In this paper, we report the porosity and heterojunction effects of hematite (α-Fe2O3) on the photoelectrochemical (PEC) water splitting properties. The worm-like mesoporous hematite thin films (MHFs) with a pore size of ∼9 nm and a wall thickness of ∼5 nm were successfully obtained through the self-assembly process. MHFs formed on FTO showed much better PEC properties than those of nonporous hematite thin films (NP-HF) owing to the suppression of charge recombination. The PEC data of MHFs under front and back illumination conditions indicated that the porous structure allows the diffusion of electrolyte deep inside the MHF increasing the number of holes to be utilized in the water oxidation reaction. A heterojunction structure was formed by introducing a thin layer of SnO2 (∼15 nm in thickness) between the MHF and FTO for a dramatically enhanced PEC response, which is attributed to the efficient electron transfer. Our spectroscopic and electrochemical data show that the SnO2 layer functions as an efficient electron transmitter, but does not affect the recombination kinetics of MHFs.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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