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DOI	10.1039/c6ee03613a
	A copper nickel mixed oxide hole selective layer for Au-free transparent cuprous oxide photocathodes
	Son M.-K.; Steier L.; Schreier M.; Mayer M.T.; Luo J.; Grätzel M.
发表日期	2017
ISSN	17545692
起始页码	912
结束页码	918
卷号	10 期号:4
英文摘要	State-of-the-art cuprous oxide (Cu2O) photocathodes for photoelectrochemical (PEC) water splitting have a long tradition of using gold (Au)-coated F-doped SnO2 (FTO) substrates for the improvement of Cu2O electrodeposition and overall PEC performance. Au is one of the best contact materials for Cu2O photocathodes due to its large work function enabling proper alignment with the valence band level of Cu2O. Due to its relatively large band gap (2.0 eV), Cu2O is preferentially used as the top-cell absorber in tandem with a photoanode or a photovoltaic (PV) cell for overall solar-driven water splitting. However, the Au contact poses a major issue due to its poor transparency. Moreover, Au is a precious metal, which increases the cost and can hinder the scalability of PEC devices. In this work, we propose an effective replacement of the Au layer with a transparent and cost-efficient copper-nickel mixed oxide (CuO/NiO) thin film, which is prepared by a facile sequential sputtering deposition combined with an annealing process in air. We successfully demonstrate that a thin layer of the CuO/NiO film shows better transparency as well as well-aligned energy levels for efficient hole collection leading to an improved PEC performance compared to the performance of a Au-contact based equivalent device in a pH 5 electrolyte biased at 0 V versus the reversible hydrogen electrode. This new transparent and efficient CuO/NiO layer paves the way for the development of efficient, yet inexpensive PEC-PV or photocathode-photoanode stacked tandem devices for a hydrogen fuel based economy. © The Royal Society of Chemistry 2017.
英文关键词	Deposition; Electrolytes; Energy gap; Field emission cathodes; Fuel economy; Gold coatings; Gold compounds; Nickel oxide; Photocathodes; Photoelectrochemical cells; Solar power generation; Thin films; Transparency; Annealing process; F-doped sno2 substrates; Hole selective layers; Photoelectrochemicals; Reversible hydrogen electrodes; Sequential sputtering; Stacked tandem devices; State of the art; Copper oxides; copper; copper compound; electrode; electrolyte; gold; hydrogen; nickel; oxide; photochemistry; photovoltaic system; solar power; substrate; transparency
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190495
作者单位	Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, CH-1015, Switzerland; Imperial College London, Durrant Group, South Kensington Campus, London, SW7 2AZ, United Kingdom
推荐引用方式 GB/T 7714	Son M.-K.,Steier L.,Schreier M.,et al. A copper nickel mixed oxide hole selective layer for Au-free transparent cuprous oxide photocathodes[J],2017,10(4).
APA	Son M.-K.,Steier L.,Schreier M.,Mayer M.T.,Luo J.,&Grätzel M..(2017).A copper nickel mixed oxide hole selective layer for Au-free transparent cuprous oxide photocathodes.Energy & Environmental Science,10(4).
MLA	Son M.-K.,et al."A copper nickel mixed oxide hole selective layer for Au-free transparent cuprous oxide photocathodes".Energy & Environmental Science 10.4(2017).