Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
The efficient conversion of solar energy to produce hydrogen via photoelectrochemical cells (PEC) to split water molecules has been regarded as a promising alternative for sustainable power generation. Compared with other semiconductors, iron oxide in the hematite phase (α-Fe2O3) has many advantages to be used in a PEC system because it combines important characteristics, such as high chemical stability, absorption of light in the visible region, nontoxicity, abundance, and low cost of obtainment [1]. Since the hole diffusion length of hematite is much smaller (~ 4 nm) than the width of the space-charge layer, the incorporation of reduced graphene oxide (rGO) on the hematite photoanodes can overcome such limitations due to graphene’s exceptional properties[2].
The hematite nanorods photoanodes were modified with rGO, which was obtained by the reduction of graphene oxide at different times (1, 5, 20 and 24 hours). The results showed the influence of reduction time of graphene oxide on the activity of hematite nanorods photoanodes for solar water splitting. The samples modified with rGO at the reduction time of 1 and 3 hours presented a lower performance, compared with the others at reduction time of 20 and 24 hours, which showed the improvement of photocurrent. The conductivity of rGO sheets can be modified by controlling the reduction time of GO, which significantly affects the performance of hematite photoanodes in water splitting reactions.
[1] J. Brillet, M. Cornuz, F. Le Formal, J.-H. Yum, M. Gratzel, K. Sivula, J.Mater. Res. 25., 17 (2010) [2] Carminati, S. A, Souza, F. L, Nogueira, A. F, ChemPhysChem 17., 170 (2016).
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