RuO₂-NaTaO₃ heterostructure for its application in photoelectrochemical water splitting under simulated sunlight illumination

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• 作者：C. Gó ; mez-Solí ; s ; J.C. Ballesteros ; L.M. Torres-Martí ; nez ; ^{lettorresg@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; I. Juá ; rez-Ramí ; rez
• 关键词：NaTaO3 ; RuO2 ; Photoelectrochemical ; Band gap ; Hydrogen production
• 刊名：Fuel
• 出版年：2016
• 出版时间：15 February 2016
• 年：2016
• 卷：166
• 期：Complete
• 页码：36-41
• 全文大小：1148 K

文摘

In this paper, we report the synthesis of RuO₂–NaTaO₃ films for their application as photocathodes in photoelectrochemical (PEC) cells for hydrogen generation from water splitting. RuO₂ was electrodeposited on NaTaO₃ films at constant current varying the deposition time with the finality to obtain 1–3 wt.% RuO₂–NaTaO₃. The characterization of the photoelectrodes RuO₂–NaTaO₃ was carried out by linear voltammetry (VL), chronoamperometry (CA), scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM/EDS), X-ray diffraction (XRD), ultraviolet–visible absorption spectroscopy (UV–vis) and X-ray photoelectron spectroscopy (XPS). The hydrogen production was conducted in a photoelectrochemical reactor coupled with a gas chromatograph. One of the main contributions of this work is the incorporation of RuO₂ on NaTaO₃ films in order to enhance its activity in the visible region, achieving a maximum photoelectrochemical hydrogen production of 15.7 mmol h⁻¹ g⁻¹ for the film with 2 wt.% RuO₂ with a solar-to-hydrogen (STH) conversion efficiency of 4.29%.