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alpha-Fe2O3/TiO2 3D hierarchical nanostructures for enhanced photoelectrochemical water splitting

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F17%3AA1701LCY" target="_blank" >RIV/61988987:17310/17:A1701LCY - isvavai.cz</a>

  • Alternative codes found

    RIV/61989592:15310/17:73583536 RIV/61988987:17310/17:A2301LCY

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    alpha-Fe2O3/TiO2 3D hierarchical nanostructures for enhanced photoelectrochemical water splitting

  • Original language description

    We report the fabrication of 3D hierarchical hetero-nanostructures composed of thin alpha-Fe2O3 nanoflakes branched on TiO2 nanotubes. The novel alpha-Fe2O3/TiO2 hierarchical nanostructures, synthesized on FTO through a multi-step hydrothermal process, exhibit enhanced performances in photo-electrochemical water splitting and in the photocatalytic degradation of an organic dye, with respect to pure TiO2 nanotubes. An enhanced separation of photogenerated charge carriers is here proposed as the main factor for the observed photo-activities: electrons photogenerated in TiO2 are efficiently collected at FTO, while holes are transferred to the alpha-Fe2O3 nanobranches that serve as charge mediators to the electrolyte. The morphology of alpha-Fe2O3 that varies from ultrathin nanoflakes to nanorod/nanofiber structures depending on the Fe precursor concentration was shown to have a significant impact on the photo-induced activity of the alpha-Fe2O3/TiO2 composites. In particular, it is shown that for an optimized photo-electrochemical structure, a combination of critical factors should be achieved such as (i) TiO2 light absorption and photo-activation vs. alpha-Fe2O3-induced shadowing effect and (ii) the availability of free TiO2 surface vs. alpha-Fe2O3-coated surface. Finally, theoretical analysis, based on DFT calculations, confirmed the optical properties experimentally determined for the alpha-Fe2O3/TiO2 hierarchical nanostructures. We anticipate that this new multi-step hydrothermal process can be a blueprint for the design and development of other hierarchical heterogeneous metal oxide electrodes suitable for photo-electrochemical applications.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    CF - Physical chemistry and theoretical chemistry

  • OECD FORD branch

Result continuities

  • Project

    Result was created during the realization of more than one project. More information in the Projects tab.

  • Continuities

    V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Others

  • Publication year

    2017

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Nanoscale

  • ISSN

    2040-3364

  • e-ISSN

  • Volume of the periodical

    9

  • Issue of the periodical within the volume

    1

  • Country of publishing house

    GB - UNITED KINGDOM

  • Number of pages

    9

  • Pages from-to

    134-142

  • UT code for WoS article

    000391739300019

  • EID of the result in the Scopus database

    2-s2.0-85007366503