Combinatorial Synthesis and High-Throughput Characterization of Fe-V-O Thin-Film Materials Libraries for Solar Water Splitting.
ACS Comb Sci
; 20(9): 544-553, 2018 09 10.
Article
en En
| MEDLINE
| ID: mdl-30102852
ABSTRACT
The 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 Fe10V90O x to Fe79V21O x) 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 â¼11 to 42 at. % Fe (toward low-Fe region) and the FeVO4 phase from â¼37 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 (â¼160 to 190 µA/cm2) throughout the thickness gradients whereas compositions with the Fe2V4O13 phase show comparatively low photocurrent densities (â¼28 µA/cm2). The band gap energies of Fe-V-O films were inferred from Tauc plots. The highest photocurrent density of â¼190 µA/cm2 was obtained for films with â¼54 to 66 at. % Fe for the FeVO4 phase with â¼2.04 eV for the indirect and â¼2.80 eV for the direct band gap energies.
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Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Óxidos
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Vanadio
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Agua
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Técnicas Químicas Combinatorias
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Bibliotecas de Moléculas Pequeñas
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Hierro
Idioma:
En
Revista:
ACS Comb Sci
Año:
2018
Tipo del documento:
Article
País de afiliación:
Alemania