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More than protection : the function of TiO2 interlayers in hematite functionalized Si photoanodes

Kawde, Anurag, 1984- (författare)
Umeå University,Lund University,Lunds universitet,Umeå universitet,Kemiska institutionen,European Synchrotron Radiation Facility, Grenoble, France; Lund Institute of advanced Neutron and X-Ray Science, Lund University, Sweden; NanoLund and Chemical Physics, Department of Chemistry, Lund University,Sweden,Umeå Univ, Fac Sci & Technol, Dept Chem, Umeå, Sweden.;European Synchrotron Radiat Facil, Grenoble, France.;Lund Univ, Lund Inst Adv Neutron & Xray Sci, Lund, Sweden.;Lund Univ, Dept Chem, NanoLund & Chem Phys, Lund, Sweden.,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Kemisk fysik,Enheten för fysikalisk och teoretisk kemi,Institutioner vid LTH,LINXS - Institute of advanced Neutron and X-ray Science,Other operations, LTH,Faculty of Engineering, LTH,Chemical Physics,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH,Faculty of Engineering, LTH
Annamalai, Alagappan (författare)
Umeå University,Umeå universitet,Institutionen för fysik,Umeå Univ, Fac Sci & Technol, Dept Phys, Umeå, Sweden.
Sellstedt, Anita, 1953- (författare)
Umeå University,Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC),Umeå Univ, Fac Sci & Technol, Dept Plant Physiol, Umeå Plant Sci Ctr UPSC, Umeå, Sweden.
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Uhlig, Jens (författare)
Lund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Kemisk fysik,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Other operations, LTH,Faculty of Engineering, LTH,Chemical Physics,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
Wågberg, Thomas, 1971- (författare)
Umeå University,Umeå universitet,Institutionen för fysik,Umeå Univ, Fac Sci & Technol, Dept Phys, Umeå, Sweden.
Glatzel, Pieter (författare)
European Synchrotron Radiat Facil, Grenoble, France.,European Synchrotron Radiation Facility
Messinger, Johannes (författare)
Uppsala University,Umeå University,Uppsala universitet,Umeå universitet,Kemiska institutionen,Molecular Biomimetics, Department of Chemistry – Ångström Laboratory, Uppsala University, Sweden,Molekylär biomimetik,Umeå Univ, Fac Sci & Technol, Dept Chem, Umeå, Sweden.
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 (creator_code:org_t)
2020
2020
Engelska.
Ingår i: Physical Chemistry, Chemical Physics - PCCP. - : Royal Society of Chemistry. - 1463-9076 .- 1463-9084. ; 22:48, s. 28459-28467
Relaterad länk:
https://doi.org/10.1...
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http://dx.doi.org/10... (free)
https://urn.kb.se/re...
https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Worldwide significant efforts are ongoing to develop devices that store solar energy as fuels. In one such approach, solar energy is absorbed by semiconductors and utilized directly by catalysts at their surfaces to split water into H2 and O2. To protect the semiconductors in these photo-electrochemical cells (PEC) from corrosion, frequently thin TiO2 interlayers are applied. Employing a well-performing photoanode comprised of 1-D n-Si microwires (MWs) covered with a mesoporous (mp) TiO2 interlayer fabricated by solution processing and functionalized with α-Fe2O3 nanorods, we studied here the function of this TiO2 interlayer by high-energy resolution fluorescence detected X-ray absorption near edge structure (HERFD-XANES) spectroscopy, along with X-ray emission spectroscopy (XES) and standard characterization techniques. Our data reveal that the TiO2 interlayer not only protects the n-Si MW surface from corrosion, but that it also acts as a template for the hydrothermal growth of α-Fe2O3 nanorods and improves the photocatalytic efficiency. We show that the latter effect correlates with the presence of stable oxygen vacancies at the interface between mp-TiO2 and α-Fe2O3, which act as electron traps and thereby substantially reduce the charge recombination rate at the hematite surface.

Ämnesord

NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)
NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)
NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

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