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Interface engineering of the photoelectrochemical performance of Ni-oxide-coated n-Si photoanodes by atomic-layer deposition of ultrathin films of cobalt oxide

Zhou, Xinghao and Liu, Rui and Sun, Ke and Friedrich, Dennis and McDowell, Matthew T. and Yang, Fan and Omelchenko, Stefan T. and Saadi, Fadl H. and Nielander, Adam C. and Yalamanchili, Sisir and Papadantonakis, Kimberly M. and Brunschwig, Bruce S. and Lewis, Nathan S. (2015) Interface engineering of the photoelectrochemical performance of Ni-oxide-coated n-Si photoanodes by atomic-layer deposition of ultrathin films of cobalt oxide. Energy and Environmental Science, 8 (9). pp. 2644-2649. ISSN 1754-5692. doi:10.1039/c5ee01687h.

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Introduction of an ultrathin (2 nm) film of cobalt oxide (CoO_x) onto n-Si photoanodes prior to sputter-deposition of a thick multifunctional NiO_x coating yields stable photoelectrodes with photocurrent-onset potentials of ~−240 mV relative to the equilibrium potential for O2(g) evolution and current densities of ~28 mA cm^(−2) at the equilibrium potential for water oxidation when in contact with 1.0 M KOH(aq) under 1 sun of simulated solar illumination. The photoelectrochemical performance of these electrodes was very close to the Shockley diode limit for moderately doped n-Si(100) photoelectrodes, and was comparable to that of typical protected Si photoanodes that contained np+ buried homojunctions.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Zhou, Xinghao0000-0001-9229-7670
Sun, Ke0000-0001-8209-364X
Friedrich, Dennis0000-0003-4844-368X
McDowell, Matthew T.0000-0001-5552-3456
Omelchenko, Stefan T.0000-0003-1104-9291
Saadi, Fadl H.0000-0003-3941-0464
Nielander, Adam C.0000-0002-3639-2427
Papadantonakis, Kimberly M.0000-0002-9900-5500
Brunschwig, Bruce S.0000-0002-6135-6727
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2015 The Royal Society of Chemistry. Received 30th May 2015, Accepted 15th July 2015, First published online 15 Jul 2015. This work was supported by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under Award Number DE-SC0004993. UV-VIS spectroscopy, atomic-force microscopy, and Kelvin probe force microscopy were performed at the Molecular Materials Resource Center (MMRC) of the Beckman Institute at the California Institute of Technology. ACN was supported by a Graduate Research Fellowship from the National Science Foundation. This work was additionally supported by the Gordon and Betty Moore Foundation under Award No. GBMF1225. Author contribution: X.Z., R.L., K.S., K.M.P, B.S.B and N.S.L designed the experiments and wrote the manuscript. X.Z., R.L., K.S., D.F., M.T.M, F.Y., S.T.O., F.H.S., A.C.N., S.Y. performed the experiments.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
NSF Graduate Research FellowshipUNSPECIFIED
Gordon and Betty Moore FoundationGBMF1225
Issue or Number:9
Record Number:CaltechAUTHORS:20150804-104946656
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59172
Deposited By: Tony Diaz
Deposited On:04 Aug 2015 20:07
Last Modified:10 Nov 2021 22:16

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