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A microstructured p-Si photocathode outcompetes Pt as a counter electrode to hematite in photoelectrochemical water splitting
Umea Univ, Dept Chem, Umea, Sweden;ESRF, Grenoble, France.
Umea Univ, Dept Phys, Umea, Sweden.ORCID iD: 0000-0002-5210-2645
Umea Univ, Dept Plant Physiol, UPSC, Umea, Sweden.
ESRF, Grenoble, France.ORCID iD: 0000-0001-6532-8144
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2019 (English)In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 48, no 4, p. 1166-1170Article in journal (Refereed) Published
Abstract [en]

Herein, we communicate about an Earth-abundant semiconductor photocathode (p-Si/TiO2/NiOx) as an alternative for the rare and expensive Pt as a counter electrode for overall photoelectrochemical water splitting. The proposed photoelectrochemical (PEC) water-splitting device mimics the Z-scheme observed in natural photosynthesis by combining two photoelectrodes in a parallel-illumination mode. A nearly 60% increase in the photocurrent density (J(ph)) for pristine -Fe2O3 and a 77% increase in the applied bias photocurrent efficiency (ABPE) were achieved by replacing the conventionally used Pt cathode with an efficient, cost effective p-Si/TiO2/NiOx photocathode under parallel illumination. The resulting photocurrent density of 1.26 mA cm(-2) at 1.23V(RHE) represents a new record performance for hydrothermally grown pristine -Fe2O3 nanorod photoanodes in combination with a photocathode, which opens the prospect for further improvement by doping -Fe2O3 or by its decoration with co-catalysts. Electrochemical impedance spectroscopy measurements suggest that this significant performance increase is due to the enhancement of the space-charge field in -Fe2O3.

Place, publisher, year, edition, pages
2019. Vol. 48, no 4, p. 1166-1170
National Category
Materials Chemistry
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URN: urn:nbn:se:uu:diva-379234DOI: 10.1039/c8dt03653eISI: 000459625900002PubMedID: 30534760OAI: oai:DiVA.org:uu-379234DiVA, id: diva2:1297221
Funder
Knut and Alice Wallenberg Foundation, KAW 2011.0055Swedish Research Council, 2017-04862Swedish Energy Agency, 45419-1Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2019-03-19Bibliographically approved

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Messinger, Johannes

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