Iron-Treated NiO as a Highly Transparent p-Type Protection Layer for Efficient Si-Based Photoanodes.

Autor:	Mei B; †Department of Physics, Center for Individual Nanoparticle Functionality (CINF) and ‡Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark., Permyakova AA; †Department of Physics, Center for Individual Nanoparticle Functionality (CINF) and ‡Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark., Frydendal R; †Department of Physics, Center for Individual Nanoparticle Functionality (CINF) and ‡Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark., Bae D; †Department of Physics, Center for Individual Nanoparticle Functionality (CINF) and ‡Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark., Pedersen T; †Department of Physics, Center for Individual Nanoparticle Functionality (CINF) and ‡Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark., Malacrida P; †Department of Physics, Center for Individual Nanoparticle Functionality (CINF) and ‡Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark., Hansen O; †Department of Physics, Center for Individual Nanoparticle Functionality (CINF) and ‡Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark., Stephens IE; †Department of Physics, Center for Individual Nanoparticle Functionality (CINF) and ‡Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark., Vesborg PC; †Department of Physics, Center for Individual Nanoparticle Functionality (CINF) and ‡Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark., Seger B; †Department of Physics, Center for Individual Nanoparticle Functionality (CINF) and ‡Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark., Chorkendorff I; †Department of Physics, Center for Individual Nanoparticle Functionality (CINF) and ‡Department of Micro- and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
Jazyk:	angličtina
Zdroj:	The journal of physical chemistry letters [J Phys Chem Lett] 2014 Oct 16; Vol. 5 (20), pp. 3456-61. Date of Electronic Publication: 2014 Sep 29.
DOI:	10.1021/jz501872k
Abstrakt:	Sputter deposition of 50 nm thick NiO films on p(+)-n-Si and subsequent treatment in an Fe-containing electrolyte yielded highly transparent photoanodes capable of water oxidation (OER) in alkaline media (1 M KOH) with high efficiency and stability. The Fe treatment of NiO thin films enabled Si-based photoanode assemblies to obtain a current density of 10 mA/cm(2) (requirement for >10% efficient devices) at 1.15 V versus RHE (reversible hydrogen electrode) under red-light (38.6 mW/cm(2)) irradiation. Thus, the photoanodes were harvesting ∼80 mV of free energy (voltage), which places them among the best-performing Si-based photoanodes in alkaline media. The stability was proven by chronoamperometry at 1.3 V versus RHE for 300 h. Furthermore, measurements with electrochemical quartz crystal microbalances coupled with ICP-MS showed minor corrosion under dark operation. Extrapolation of the corrosion rate showed stability for more than 2000 days of continuous operation. Therefore, protection by Fe-treated NiO films is a promising strategy to achieve highly efficient and stable photoanodes.
Databáze:	MEDLINE
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