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A microstructured p...
A microstructured p-Si photocathode outcompetes Pt as a counter electrode to hematite in photoelectrochemical water-splitting
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- Kawde, Anurag, 1984- (author)
- Umeå universitet,Kemiska institutionen,European Synchrotron Radiation Facility (ESRF), Grenoble, France,Umea Univ, Dept Chem, Umea, Sweden;ESRF, Grenoble, France
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- Annamalai, Alagappan (author)
- Umeå universitet,Institutionen för fysik,Umea Univ, Dept Phys, Umea, Sweden
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- Sellstedt, Anita, 1953- (author)
- Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC),Umea Univ, Dept Plant Physiol, UPSC, Umea, Sweden
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- Glatzel, Pieter (author)
- ESRF, Grenoble, France
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- Wågberg, Thomas, 1971- (author)
- Umeå universitet,Institutionen för fysik,Umea Univ, Dept Phys, Umea, Sweden
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- Messinger, Johannes (author)
- Uppsala universitet,Umeå universitet,Kemiska institutionen,Molecular Biomimetics, Department of Chemistry, Ångström Laboratory, Uppsala University, Sweden,Molekylär biomimetik,Umea Univ, Dept Chem, Umea, Sweden
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(creator_code:org_t)
- 2019
- 2019
- English.
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In: Dalton Transactions. - : Royal Society of Chemistry. - 1477-9226 .- 1477-9234. ; 48:4, s. 1166-1170
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Abstract
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- 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 parallelillumination mode. A nearly 60% increase in the photocurrent density (Jph) for pristine α-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 1.23VRHE represents a new record performance for hydrothermally grown pristine α-Fe2O3 nanorod photoanodes in combination with a photocathode, which opens the prospect for further improvement by doping α-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 α-Fe2O3.
Subject headings
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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