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DOI	10.1039/c8ee00980e
	Elucidating the performance and unexpected stability of partially coated water-splitting silicon photoanodes
	Oh K.; Mériadec C.; Lassalle-Kaiser B.; Dorcet V.; Fabre B.; Ababou-Girard S.; Joanny L.; Gouttefangeas F.; Loget G.
发表日期	2018
ISSN	17545692
起始页码	2590
结束页码	2599
卷号	11 期号:9
英文摘要	H2 is an ideal energy carrier because it has a high energy density, and it can be easily stored, transported, and readily used to power electrical devices. Like photosynthesis, where photons are converted into energy-rich molecules, sunlight energy can be converted into H2 and O2 using photoelectrochemical water splitting cells (PECs). Despite the fact that silicon is considered one of the most attractive semiconductors for manufacturing photoelectrodes, its use is currently limited by its low activity and its instability in aqueous solutions. Herein, we report on surprisingly stable Si-based photoanodes, fabricated by simple aqueous electrodeposition, which results in the partial (<20%) coating of the Si surface with dispersed Ni nanoparticles (NPs). We show that photoelectrochemical activation considerably improves their performance by generating a high-activity catalytic shell around the Ni NPs. In addition, we demonstrate the stability of the photoanodes under various conditions in highly corrosive alkaline solutions in operation and in inactivity. The protection in operation is explained by anodic passivation, which generates a stabilizing SiOx layer. In contrast, the stability when no polarization is applied is unexpected because most of the Si, highly prone to etching, is in contact with the very corrosive aqueous phase. The experimental data allow us to propose a mechanism explaining this effect. © 2018 The Royal Society of Chemistry.
英文关键词	Catalyst activity; Corrosion; Electrochemistry; Solutions; Stability; Alkaline solutions; Anodic passivation; Electrical devices; Energy carriers; High energy densities; Photo-electrodes; Photoelectrochemical water splitting; Photoelectrochemicals; Silicon compounds; aqueous solution; electrochemical method; electrode; electronic equipment; hydrogen; hydrogen peroxide; operations technology; performance assessment; photochemistry; polarization; silicon
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/190135
作者单位	Univ Rennes, CNRS, ISCR, Institut des Sciences Chimiques de Rennes, UMR6226, Rennes, F-35000, France; Univ Rennes, CNRS, IPR, Institut de Physique de Rennes, UMR6251, Rennes, F-35000, France; Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin Gif-sur-Yvette, 91192, France; Univ Rennes, CNRS, ScanMAT-CMEBA-UMS2001, Rennes, F-35000, France
推荐引用方式 GB/T 7714	Oh K.,Mériadec C.,Lassalle-Kaiser B.,et al. Elucidating the performance and unexpected stability of partially coated water-splitting silicon photoanodes[J],2018,11(9).
APA	Oh K..,Mériadec C..,Lassalle-Kaiser B..,Dorcet V..,Fabre B..,...&Loget G..(2018).Elucidating the performance and unexpected stability of partially coated water-splitting silicon photoanodes.Energy & Environmental Science,11(9).
MLA	Oh K.,et al."Elucidating the performance and unexpected stability of partially coated water-splitting silicon photoanodes".Energy & Environmental Science 11.9(2018).