Efficient WO3 photoanodes fabricated by pulsed laser deposition for photoelectrochemical water splitting with high faradaic efficiency
| العنوان: | Efficient WO3 photoanodes fabricated by pulsed laser deposition for photoelectrochemical water splitting with high faradaic efficiency |
|---|---|
| المؤلفون: | Joan Daniel Prades, G. Penelas, María D. Hernández-Alonso, J. R. Morante, Sebastián Murcia-López, Damián Monllor-Satoca, Teresa Andreu, Cristian Fàbrega |
| المساهمون: | Universitat de Barcelona |
| المصدر: | Dipòsit Digital de la UB Universidad de Barcelona Recercat. Dipósit de la Recerca de Catalunya instname |
| بيانات النشر: | Elsevier B.V., 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | Materials science, Thin films, Nanotechnology, 02 engineering and technology, Electrolyte, 010402 general chemistry, 01 natural sciences, Catalysis, Pulsed laser deposition, Absorption (electromagnetic radiation), General Environmental Science, Photocurrent, Pel·lícules fines, Làsers, business.industry, Process Chemistry and Technology, Lasers, Direct energy conversion, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Optoelectronics, Water splitting, Conversió directa de l'energia, 0210 nano-technology, business, Layer (electronics), Faraday efficiency, Monoclinic crystal system |
| الوصف: | In this work, we present a systematic study on the synthesis of monoclinic γ-WO 3 obtained using pulsed laser deposition (PLD). A photocurrent of 2.4 mA/cm 2 (60% of the optical maximum for a 2.7 eV gap material) was obtained for films as thick as 18 μm. FE-SEM images revealed that WO 3 films were actually formed by an array of oriented columns. Efficient hole extraction toward the electrolyte was observed and attributed to a possible accommodation of the electrolyte between the WO 3 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 WO 3 photoanodes which resulted in a remarkable photocurrent density of 3.1 mA cm −2 with 1 sun AM1.5 G illumination in 0.1 M H 2 SO 4 electrolyte. Faradaic efficiencies of more than 50% was obtained without co-catalyst, which is one the highest values reported for pure WO 3 . By adding a 3 nm layer of Al 2 O 3 by ALD, a faradaic efficiency of 80% was reached without diminishing the photocurrent density. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7c0c7e267ce9e6b1c06377ac6271f855 http://hdl.handle.net/2445/97985 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....7c0c7e267ce9e6b1c06377ac6271f855 |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |