NDLI: Interfacial study of Cu2O/Ga2O3/AZO/TiO2 photocathode for water splitting fabricated by pulsed laser deposition

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Interfacial study of Cu₂O/Ga₂O₃/AZO/TiO₂ photocathode for water splitting fabricated by pulsed laser deposition

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Catalysis Science & Technology Vol - 7 Issue - 6

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Interfacial study of Cu₂O/Ga₂O₃/AZO/TiO₂ photocathode for water splitting fabricated by pulsed laser deposition

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhu, Liping Lou, Zirui Wang, Yichen Niu, Wenzhe Ye, Zhizhen
Copyright Year	2017
Abstract	Cuprous oxide (Cu2O) is expected to be one of the most promising materials for utilizing solar energy. One strategy comprises using Cu2O as a photocathode to obtain hydrogen by the reduction of water. However, the instability of Cu2O in solution hinders its employment to a great extent. Here, we fabricated a multilayer photocathode with the structure of Cu2O/Ga2O3/AZO/TiO2 by the pulsed laser deposition (PLD) technique. The highest photocurrent density was increased to 6.5 mA cm−2 in comparison to 4.5 mA cm−2 for bare Cu2O at 0 V versus a reversible hydrogen electrode (RHE), and the stability was also improved to some extent. The properties of Ga2O3 were affected to a great extent by the oxygen pressure, which thereby changed the photovoltage and stability of the photocathode. Alignment of band energies is introduced to explain this phenomenon. In a sample containing Ga2O3 under a low oxygen pressure, the relatively lower Fermi level and conduction band edge in the Ga2O3 layer formed a region of electron accumulation near the interface, which impaired its performance. In addition, the interfacial chemical state of copper element was investigated by X-ray photoelectron spectroscopy (XPS) in combination with Ar ion etching. It was revealed that for both samples Cu+ was reduced to Cu0 during the fabrication process near the Cu2O/Ga2O3 interface, which is harmful for stability. These factors resulted in the relatively unstable performance of the photocathode. This work reveals the performance of a multilayer photocathode grown by PLD and points out possible ways of improving it.
Starting Page	1602
Ending Page	1610
Page Count	9
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	7
Issue Number	7
Journal	Catalysis Science & Technology
DOI	10.1039/c7cy00040e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Chemical milling Oxygen Reversible hydrogen electrode Fermi Hydrogen Photocathode Ion Pulsed laser deposition Photoemission spectroscopy Photocurrent Fermi level Solar energy Valence and conduction bands Copper Gallium(III) oxide X-ray photoelectron spectroscopy
Content Type	Text
Resource Type	Article
Subject	Catalysis

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Interfacial study of Cu2O/Ga2O3/AZO/TiO2 photocathode for water splitting fabricated by pulsed laser deposition

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Interfacial study of Cu₂O/Ga₂O₃/AZO/TiO₂ photocathode for water splitting fabricated by pulsed laser deposition

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