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@PHDTHESIS{Welter:884788,
author = {Welter, Katharina},
title = {{S}olar driven water electrolysis based on silicon solar
cells and earth-abundant catalysts},
volume = {508},
school = {TU Darmstadt},
type = {Dr.},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {FZJ-2020-03250},
isbn = {978-3-95806-495-9},
series = {Schriften des Forschungszentrums Jülich. Reihe Energie
$\&$ Umwelt / Energy $\&$ Environment},
pages = {iv, 165 S.},
year = {2020},
note = {TU Darmstadt, Diss., 2020},
abstract = {In the present work “proof of concept” upscaling steps
were taken for a PV-EC device of 100 cm$^{2}$ substrate
size. The active thin film silicon solar cell area was
increased to 64 cm$^{2}$, while earth-abundant nickel based
catalysts were scaled up by a factor of 100 to electrode
areas of 50.3 cm$^{2}$. Implementing the thin film
siliconsolar cell into the PV-EC device in combination with
the earth-abundant catalysts yielded a solar-to-hydrogen
efficiency of 5.1 \%, which is significantly improved
compared to a PV-EC device based on nickel electrodes. It is
shown that noble metal catalysts can be replaced by
earth-abundant materials without performance losses. The
long-term stable operation of the scaled up PV-EC devices is
ensured by the use of metal sheet electrodes serving as
substrate for the catalyst deposition. Regarding the
catalyst stability, an excellent performance over 4 days
under day-night-cycling was found for the earth-abundant
nickel based system. Furthermore, the characterization of
integrated PV-EC devices was expanded to illumination
conditions similar to those obtained outdoors. All
components used in water splitting devices are usually
optimized under standard test conditions in the laboratory,
which only represent one set of a wide range of possible
outdoor operating conditions. For a combined PV-EC system
the generation of hydrogen will only occur for output
voltages above a certain value (thermodynamic potential +
overpotential losses). This means, any illumination
conditions shifting the illuminated current-voltage curve of
the coupled system such that the voltage at the operating
point is too low, will switch the system off. The influence
of the operating temperature has been investigated prior to
the present work, but studies concerning other possible
illumination conditions were missing and therefore
investigated in the present work. Additionally, a first
estimation of the annual hydrogen output is given to compare
devices based on different multi-junction cells and
employing different catalyst systems for spectral data
reported in literature.},
cin = {IEK-5},
cid = {I:(DE-Juel1)IEK-5-20101013},
pnm = {121 - Solar cells of the next generation (POF3-121)},
pid = {G:(DE-HGF)POF3-121},
typ = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
url = {https://juser.fz-juelich.de/record/884788},
}