The effects induced by post-synthesis hydrogenation on ZnFe2O4 flat films in terms of photoelectrochemical (PEC) performance of photoanodes for water oxidation have been deeply investigated as a function of the pre-annealing temperature of the materials. The structure and morphology of the films greatly affect the efficacy of the post synthesis treatment. In fact, highly compact films are obtained upon pre-annealing at high temperatures, and this limits the exposure of the material bulk to the reductive H2 atmosphere, making the treatment largely ineffective. On the other hand, a mild hydrogen treatment greatly enhances the separation of photoproduced charges in films pre-annealed at lower temperatures, as a result of the introduction of oxygen vacancies with n-type character. A comparison between present results and those obtained with ZnFe2O4 nanorods clearly demonstrates that specific structural and/or surface properties, together with the initial film morphology, differently affect the overall contribution of post-synthesis hydrogenation on the efficiency of zinc ferrite-based photoanodes.
Hydrogenation of ZnFe2O4 Flat Films: Effects of the Pre-Annealing Temperature on the Photoanodes Efficiency for Water Oxidation / A. Polo, C.L. Lhermitte, M.V. Dozzi, E. Selli, K. Sivula. - In: SURFACES. - ISSN 2571-9637. - 3:1(2020 Mar 12), pp. 93-104.
|Titolo:||Hydrogenation of ZnFe2O4 Flat Films: Effects of the Pre-Annealing Temperature on the Photoanodes Efficiency for Water Oxidation|
POLO, ANNALISA (Primo) [Writing – Original Draft Preparation] (Corresponding)
DOZZI, MARIA VITTORIA [Writing – Review & Editing]
SELLI, ELENA (Penultimo) [Supervision]
|Settore Scientifico Disciplinare:||Settore CHIM/02 - Chimica Fisica|
|Data di pubblicazione:||12-mar-2020|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.3390/surfaces3010009|
|Appare nelle tipologie:||01 - Articolo su periodico|