Tailoring Multilayered BiVO4 Photoanodes by Pulsed Laser Deposition for Water Splitting

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• 作者：Sebastián Murcia-López ; Cristian Fàbrega ; Damián Monllor-Satoca ; María D. Hernández-Alonso ; Germán Penelas-Pérez ; Alex Morata ; Juan R. Morante ; Teresa Andreu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：February 17, 2016
• 年：2016
• 卷：8
• 期：6
• 页码：4076-4085
• 全文大小：504K
• ISSN：1944-8252

文摘

Pulsed laser deposition (PLD) is proposed as promising technique for the fabrication of multilayered BiVO₄-based photoanodes. For this purpose, bare BiVO₄ films and two heterojunctions, BiVO₄/SnO₂ and BiVO₄/WO₃/SnO₂, have been prepared using consecutive ablation of assorted targets in a single batch. The ease, high versatility and usefulness of this technique in engineering the internal configuration of the photoanode with stoichiometric target-to-substrate transfer are demonstrated. The obtained photocurrent densities are among the highest reported values for undoped BiVO₄ without oxygen evolution catalysts (OEC). A detailed analysis of the influence of SnO₂ and WO₃ layers on the charge transport properties because of the changes at the internal FTO/semiconductor interface is performed through transient photocurrent measurements (TPC), showing that the BiVO₄/WO₃/SnO₂ heterostructure attains a significant decrease in the internal losses and reaches high photocurrent values. This study is expected to open the door to the fabrication of other systems based on ternary (or even more complex) metal oxides as photoanodes for water splitting, which is a promising alternative for obtaining materials able to fulfill the different requierements in the development of more efficient systems for this process.