Effectiveness of nitrogen incorporation to enhance the photoelectrochemical activity of nanostructured TiO2:NH3 versus H2-N2 annealing |
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Authors: | Fàbrega Cristian Andreu Teresa Güell Frank Prades Joan Daniel Estradé Sònia Rebled Jose Manuel Peiró Francesca Morante Joan Ramon |
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Affiliation: | M2E-XaRMAE, Departamento d'Electrònica, Universitat de Barcelona, Barcelona, Spain. cfabrega@el.ub.es |
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Abstract: | Highly ordered TiO(2) nanohole layers were synthesized by anodic oxidation of titanium foils using ethylene glycol and ammonium fluoride as the electrolyte. The effectiveness of different methods, namely annealing at 500?°C in NH(3) and in H(2) diluted in N(2), to incorporate nitrogen into TiO(2) and thus extend its photoelectrochemical (PEC) activity to the visible range was studied. The intra-gap levels introduced by both processes were identified by means of XPS and PL measurements. Water splitting experiments demonstrated that annealing in H(2) improved the photocatalytic activity of pure TiO(2), while annealing in ammonia led to a decrease in the PEC performance. |
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