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

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

—

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

—

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CF - Physical chemistry and theoretical chemistry

OECD FORD branch

—

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

Publication year

2017

Confidentiality

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

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