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Photo-electrochemic...
Photo-electrochemical hydrogen production from neutral phosphate buffer and seawater using micro-structured p-Si photo-electrodes functionalized by solution-based methods
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- Kawde, Anurag (author)
- Umeå universitet,Kemiska institutionen,Umeå University, Department of Chemistry, Sweden; European Synchrotron Radiation Facility (ESRF), Grenoble, France,Johannes Messinger
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- Annamalai, Alagappan (author)
- Umeå universitet,Institutionen för fysik,Umea University, Department of Physics, Sweden
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- Amidani, Lucia (author)
- European Synchrotron Radiation Facility (ESRF), Grenoble, France
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- Boniolo, Manuel (author)
- Uppsala universitet,Molekylär biomimetik
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- Kwong, Wai Ling (author)
- Uppsala universitet,Molekylär biomimetik
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- Sellstedt, Anita, 1953- (author)
- Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC),Umeå University, Department of Plant Physiology, Umeå Plant Science Centre (UPSC), Umeå, Sweden
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- Glatzel, Pieter (author)
- European Synchrotron Radiation Facility (ESRF), Grenoble, France
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- Wågberg, Thomas, 1971- (author)
- Umeå universitet,Institutionen för fysik,Umea University, Department of Physics, 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,Umeå University, Department of Chemistry, Sweden
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(creator_code:org_t)
- 2018
- 2018
- English.
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In: Sustainable Energy & Fuels. - : Royal Society of Chemistry (RSC). - 2398-4902. ; 2:10, s. 2215-2223
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Abstract
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- Solar fuels such as H2 generated from sunlight and seawater using earth-abundant materials are expected to be a crucial component of a next generation renewable energy mix. We herein report a systematic analysis of the photo-electrochemical performance of TiO2 coated, microstructured p-Si photoelectrodes (p-Si/TiO2) that were functionalized with CoOx and NiOx for H2 generation. These photocathodes were synthesized from commercial p-Si wafers employing wet chemical methods. In neutral phosphate buffer and standard 1 sun illumination, the p-Si/TiO2/NiOx photoelectrode showed a photocurrent density of 1.48 mA cm2 at zero bias (0 VRHE), which was three times and 15 times better than the photocurrent densities of p-Si/TiO2/CoOx and p-Si/TiO2, respectively. No decline in activity was observed over a five hour test period, yielding a Faradaic efficiency of 96% for H2 production. Based on the electrochemical characterizations and the high energy resolution fluorescence detected X-ray absorption near edge structure (HERFD-XANES) and emission spectroscopy measurements performed at the Ti Ka1 fluorescence line, the superior performance of the p-Si/TiO2/ NiOx photoelectrode was attributed to improved charge transfer properties induced by the NiOx coating on the protective TiO2 layer, in combination with a higher catalytic activity of NiOx for H2-evolution. Moreover, we report here an excellent photo-electrochemical performance of p-Si/TiO2/NiOx photoelectrode in corrosive artificial seawater (pH 8.4) with an unprecedented photocurrent density of 10 mA cm2 at an applied potential of 0.7 VRHE, and of 20 mA cm2 at 0.9 VRHE. The applied bias photon-to-current conversion efficiency (ABPE) at 0.7 VRHE and 10 mA cm2 was found to be 5.1%
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)
Keyword
- solar water splitting
- artificial photosynthesis
- X-ray Spectroscopy
- Kemi med inriktning mot materialkemi
Publication and Content Type
- ref (subject category)
- art (subject category)
- kfu (subject category)
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- By the author/editor
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Kawde, Anurag
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Annamalai, Alaga ...
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Amidani, Lucia
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Boniolo, Manuel
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Kwong, Wai Ling
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Sellstedt, Anita ...
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show more...
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Glatzel, Pieter
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Wågberg, Thomas, ...
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Messinger, Johan ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Materials Chemis ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
- Articles in the publication
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Sustainable Ener ...
- By the university
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Umeå University
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Uppsala University