کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1281248 | 1497499 | 2014 | 8 صفحه PDF | دانلود رایگان |
• Hematite films were deposited using PE-CVD at room temperature.
• Films were modified by hydrogen plasma treatment at various temperatures.
• Modified sample showed enhanced photocurrent density (3.5 mA/cm2).
• Photocurrent onset potential reduced up to 0.4 V.
We demonstrate the effect of hydrogen plasma treatment on hematite films as a simple and effective strategy for modifying the existing substrate to improve significantly the band edge positions and photoelectrochemical (PEC) performance. Plasma treated hematite films were consist of mixed phases (Fe3O4:α-Fe2O3) which was confirmed by XPS and Raman analysis, treated films also showed higher absorption cross-section and were found to be a promising photoelectrode material. The treated samples showed enhance photocurrent densities with maximum of 3.5 mA/cm2 at 1.8 V/RHE and the photocurrent onset potentials were shifted from 1.68 VRHE (untreated) to 1.28 VRHE (treated). Hydrogen plasma treatment under non-equilibrium conditions induced a valence dynamics among Fe centers in the sub-surface region that was sustained by the incorporation of hydrogen in the hematite lattice as supported by the density functional theory calculations.
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 10, 26 March 2014, Pages 4828–4835