Improvement of Photoelectrochemical Properties by Surface Modification with Iron Oxide on p-Type Si Electrodes for Hydrogen Evolution from Water
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Surface modifications using platinum (Pt) particles and iron oxides (FeO<sub>x</sub>) were found to lead to a significant improvement in the current--potential ($J$--$E$) properties for hydrogen evolution from water in p-type silicon (p-Si) electrodes. The onset potential and cathodic photocurrent for hydrogen evolution from the Pt/p-Si(100) electrode were, respectively, 0.50 V<sub>\text{RHE</sub> and 0.28 mA/cm2 at 0 V<sub>\text{RHE</sub> (RHE: reversible hydrogen electrode). When the p-Si(100) electrode was coated with iron oxide followed by Pt particles [Pt/FeO<sub>x</sub>/p-Si(100)], it showed an onset potential and photocurrent of 0.85 V<sub>\text{RHE</sub> and 2.45 mA/cm2 at 0 V<sub>\text{RHE</sub>, respectively. A detailed study of surface morphology and a comparative study between (100) plane and (111) plane p-Si electrodes revealed that the dramatic improvement in $J$--$E$ properties was the result of a change in the surface structure and tailing of FeO<sub>x</sub> in p-Si.
- 2011-08-25
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