Abstract
Improvement in the hydrogen evolution is reported over α-Fe2O3 supported on Algerian natural clay. The hetero-system is prepared by impregnation and calcination at 450 °C. It was characterized by X-ray diffraction, SEM analysis, FTIR spectroscopy and photo electrochemistry. The hematite Fe2O3 crystallizes in the corundum structure and exhibits n-type conductivity with a flat band potential of −0.88 VSCE. Hence, the photo electrons located in Fe2O3-CB (−1 VSCE) have high ability to reduce water into hydrogen. α-Fe2O3 gets effectively dispersed in the clay and the photoactivity increases with increasing its content. SO32−, working as hole scavenger, provides an absolute protection against the photo corrosion and favors the charges separation. The best performance of H2 evolution occurs at alkaline pH on 10% Fe2O3/clay with a liberation rate 0.121 μmol/mg/min and a quantum efficiency of 1.2%.
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