Nanostructured « Fe2O3/nickel-based co-catalyst» electrode materials for the photoelectrochemical oxidation of urea in wastewaters
Résumé
The electrochemical and photoelectrochemical (PEC) properties of undoped, Ni-doped hematite nanoparticles and the film Ni-Fe2O3/Ni, a photoactive semiconductor, were investigated utilizing a methodology that combined the co-precipitation approach, spin-coating method and the sputtering-assisted synthesis of Fe2O3, Ni-Fe2O3, and Ni-Fe2O3/Ni, respectively. The excellent oxygen evolution reaction (OER) response was observed for 15% Ni-Fe2O3. The super capacitive properties of Ni-Fe2O3 at a scan rate of 10 mVs−1show a maximum super capacitance of 914.76 F/g. The electrochemical oxidation of water achieved by Ni-Fe2O3@GCE modified electrode exhibited the current density of 1.5 mA/cm 2 at 1.5 V vs. the reversible hydrogen electrode (RHE) for 15% of Ni and reveals enhanced specific capacitance of 914.76 F/g. In another part, this work reported the photoelectrochemical (PEC) properties of undoped and 15% Ni-Fe2O3 photoanodes. A photocurrent 1.8 and 0.35 μA/cm 2 at 1.5 V vs. RHE was obtained for undoped and 15% Ni-doped hematite, respectively. It is worth to note that the oxidation current density of 15% Ni-Fe2O3/Ni reached 300 μA/cm 2 at 1.6 V, which is greater than three times of the highest current density than in water (100 μA/cm 2).
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