Title:
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Efficient WO3 photoanodes fabricated by pulsed laser deposition for photoelectrochemical water splitting with high faradaic efficiency
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Author:
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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
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Other authors:
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Universitat de Barcelona |
Abstract:
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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. |
Subject(s):
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-Conversió directa de l'energia -Làsers -Pel·lícules fines -Direct energy conversion -Lasers -Thin films |
Rights:
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cc-by-nc-nd (c) Elsevier B.V., 2016
info:eu-repo/semantics/embargoedAccess
http://creativecommons.org/licenses/by-nc-nd/3.0/es |
Document type:
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Article Article - Accepted version |
Published by:
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Elsevier B.V.
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