Hematite (α-Fe 2O 3) film is electrochemically deposited onto the surface of tungsten trioxide (WO 3) nanoparticulate film. The synthesis of the WO 3 nanostructure is directed by surfactants for control of its morphology. The resulting composite shows visible light harvesting and is tested as photoanodes in heterojunction photoelectrochemical cells for the possibility of direct water splitting under visible illumination. The composite's structural and optical properties are characterized by FESEM, EDS, XRD, XPS, and UV-vis spectrometry; its photocurrent responses are also investigated under simulated solar illumination. Coupling WO 3 with hematite results in over 9 times greater photocurrent density than that shown by pure WO 3 in sodium sulfate electrolyte. This simple modification can significantly improve the performance of WO 3.
Bibliographical noteFunding Information:
This work was supported by grants (2011-0030254 and NCRC program (2011-0006268)) of National Research Foundation (NRF) funded by the Korea Ministry of Education, Science and Technology (MEST) . J. H. Park acknowledges Future-based Technology Development Program (Nano Fields) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology ( 2010-0029321 ). A. Mao and J. K. Kim contributed equally to this work.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering