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Wiley, ChemElectroChem, 10(3), p. 1517-1517, 2016

DOI: 10.1002/celc.201600566

Wiley, ChemElectroChem, 10(3), p. 1546-1552, 2016

DOI: 10.1002/celc.201500554

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Back-illuminated Si based photoanode with nickel cobalt oxide catalytic protection layer

Journal article published in 2016 by Dowon Bae ORCID, Bastian Timo Mei ORCID, R. Fryendal, Rasmus Frydendal, Rasmus Fryndendal, Thomas Pedersen, Brian J. Seger, Ole Hansen ORCID, Peter Christian Kjaergaard Vesborg ORCID, I. Chorkendorf, Ib Chorkendorff ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Si is an excellent photo-absorber for use in dual-band-gap photoelectrochemical water splitting. We investigate photoanodes with n+pp+-Si configuration under back-side illumination, which is suited to work in a tandem device stack. A co-sputtered NiCoOx film coupled to the Si was used as a protective catalyst for the water oxidation reaction in 1 m KOH. The sample showed a high photocurrent (21 mA cm−2) under red-light illumination (38.6 mW cm−2). Long-term stability testing showed a gradual decrease of activity in the beginning, and then the activity increased, yielding a cathodic shift of the onset voltage (>50 mV), likely owing to the divergent response of Ni and Co to the Fe present in KOH. Once the activity of the sample stabilized, no further degradation was observed for the following 6 days, indicating that the demonstrated back-illuminated photoanode configuration can be considered a promising architecture for use as a bottom cell of the tandem water-splitting device under alkaline conditions.