Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/97985
Title: Efficient WO3 photoanodes fabricated by pulsed laser deposition for photoelectrochemical water splitting with high faradaic efficiency
Author: Fàbrega i Claveria, Ma. Carme
Murcia-López, S.
Monllor-Satoca, D.
Prades García, Juan Daniel
Hernández-Alonso, M.D.
Penelas, G.
Morante i Lleonart, Joan Ramon
Andreu Arbella, Teresa
Keywords: Conversió directa de l'energia
Làsers
Pel·lícules fines
Direct energy conversion
Lasers
Thin films
Issue Date: 26-Feb-2016
Publisher: Elsevier B.V.
Abstract: In this work, we present a systematic study on the synthesis of monoclinic gamma - WO3 obtained using pulsed laser deposition (PLD). A photocurrent of 2.4 mA/cm2 (60% of the optical maximum for a 2.7 eV gap material) was obtained for films as thick as 18 micro_m. FE-SEM images revealed that WO3 films were actually formed by an array of oriented columns. Efficient hole extraction towards the electrolyte was observed and attributed to a possible accommodation of the electrolyte between the WO3 columns, even for relatively compact films. This feature, combined with the detailed optical absorption and IPCE characterization, allowed us to implement a double-stack configuration of WO3 photoanodes which resulted in a remarkable photocurrent density of 3.1 mA·cm-2 with 1 sun AM1.5G illumination in 0.1 M H2SO4 electrolyte. Faradaic efficiencies of more than 50% was obtained without co-catalyst, which is one the highest values reported for pure WO3. By adding a 3 nm layer of Al2O3 by ALD, a faradaic efficiency of 80% was reached without diminishing the photocurrent density.
Note: Versió postprint del document publicat a: http://dx.doi.org/10.1016/j.apcatb.2016.02.047
It is part of: Applied Catalysis B-Environmental, 2016, vol. 189, p. 133-140
Related resource: http://dx.doi.org/10.1016/j.apcatb.2016.02.047
URI: http://hdl.handle.net/2445/97985
ISSN: 0926-3373
Appears in Collections:Articles publicats en revistes (Electrònica)

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