Facile fabrication of tin-doped hematite photoelectrodes – effect of doping on magnetic properties and performance for light-induced water splitting
| Autor: | Libor Machala, Kevin Sivula, Jiri Frydrych, Radek Zboril, O. Schneeweiss, Jan Filip, Michael Grätzel, Karolina Siskova, Jung Hwa Seo, Klara Safarova, Jiri Tucek, Jiri Pechousek, Martin Vondráček |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Journal of Materials Chemistry. 22:23232 |
| ISSN: | 1364-5501 0959-9428 |
| Popis: | We present a new, easily scalable method for the deposition of nanocrystalline hematite photoelectrodes based on the spin-coating of a mixed solution containing tin(II) and iron(III) chlorides followed by thermal treatment. Our facile approach does not require any additional film-forming organic species and allows simple control of the photoelectrochemical performance of the electrode by adjusting the degree of tin doping. When annealed at 650 degrees C a strong increase in the water oxidation photocurrent is observed with increasing tin concentration. The maximum performance (0.45 mA cm(-2) at 1.43 V vs. RHE) was found at the highest possible tin loading (20 : 100, Sn : Fe). The contrasting performance of electrodes annealed at 650 degrees C and 800 degrees C suggests different activation processes for dopant diffusion and activation. The doping of tin into the crystal structure of hematite thin films is directly evidenced by X-ray photoelectron spectroscopy and indirectly by changes in the intrinsic magnetic parameters (Morin temperature, Neel temperature) of the hematite films. The magnetization measurements thus represent a potential technique to quantify doping amounts in hematite. |
| Databáze: | OpenAIRE |
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