co8b00030_si_001.pdf (2.62 MB)
Combinatorial Synthesis and High-Throughput Characterization of Fe–V–O Thin-Film Materials Libraries for Solar Water Splitting
journal contribution
posted on 2018-08-13, 00:00 authored by Swati Kumari, Ramona Gutkowski, João R. C. Junqueira, Aleksander Kostka, Katharina Hengge, Christina Scheu, Wolfgang Schuhmann, Alfred LudwigThe
search for suitable materials for solar water splitting is
addressed with combinatorial material science methods. Thin film Fe–V–O
materials libraries were synthesized using combinatorial reactive
magnetron cosputtering and subsequent annealing in air. The design
of the libraries comprises a combination of large compositional gradients
(from Fe10V90Ox to
Fe79V21Ox) and thickness
gradients (from 140 to 425 nm). These material libraries were investigated
by high-throughput characterization techniques in terms of composition,
structure, optical, and photoelectrochemical properties to establish
correlations between composition, thickness, crystallinity, microstructure,
and photocurrent density. Results show the presence of the Fe2V4O13 phase from ∼11 to 42 at.
% Fe (toward low-Fe region) and the FeVO4 phase from ∼37
to 79 at. % Fe (toward Fe-rich region). However, as a third phase,
Fe2O3 is present throughout the compositional
gradients (from low-Fe to Fe-rich region). Material compositions with
increasing crystallinity of the FeVO4 phase show enhanced
photocurrent densities (∼160 to 190 μA/cm2) throughout the thickness gradients whereas compositions with the
Fe2V4O13 phase show comparatively
low photocurrent densities (∼28 μA/cm2). The
band gap energies of Fe–V–O films were inferred from
Tauc plots. The highest photocurrent density of ∼190 μA/cm2 was obtained for films with ∼54 to 66 at. % Fe for
the FeVO4 phase with ∼2.04 eV for the indirect and
∼2.80 eV for the direct band gap energies.
History
Usage metrics
Categories
Keywords
thickness gradientsphotocurrent densityFe 2 V 4 O 13 phase showSolar Water SplittingFe-rich regionband gap energiesFe 10 V 90 O xcombinatorial reactive magnetron cosputteringhigh-throughput characterization techniquesFe 2 V 4 O 13 phaseFeVO 4 phasecombinatorial material science methodsFeVO 4 phase showFe 79 V 21 O xFe 2 O 3
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC