http://www.cnr.it/ontology/cnr/individuo/prodotto/ID287060

Hierarchical Hematite Nanoplatelets for Photoelectrochemical Water Splitting (Articolo in rivista)

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Hierarchical Hematite Nanoplatelets for Photoelectrochemical Water Splitting (Articolo in rivista) (literal)

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Alternative label

Marelli, Marcello; Naldoni, Alberto; Minguzzi, Alessandro; Allieta, Mattia; Virgili, Tersilla; Scavia, Guido; Recchia, Sandro; Psaro, Rinaldo; Dal Santo, Vladimiro (2014)
Hierarchical Hematite Nanoplatelets for Photoelectrochemical Water Splitting
in ACS applied materials & interfaces (Print); American Chemical Society, Washington (Stati Uniti d'America)
(literal)

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Marelli, Marcello; Naldoni, Alberto; Minguzzi, Alessandro; Allieta, Mattia; Virgili, Tersilla; Scavia, Guido; Recchia, Sandro; Psaro, Rinaldo; Dal Santo, Vladimiro (literal)

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CNR-Istituto di Scienze e Tecnologie Molecolari, Via C. Golgi 19, 20133 Milano, Italy Dipartimento di Chimica, Universita' degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy Istituto di Fotonica e Nanotecnologie (IFN) CNR, Dipartimento di Fisica, Politecnico di Milano, 20132 Milano, Italy CNR-Istituto per lo Studio delle Macromolecole (ISMAC), 20133 Milano, Italy Dipartimento di Scienza e Alte Tecnologie, Universita' dell'Insubria, 22100 Como, Italy (literal)

Titolo

Hierarchical Hematite Nanoplatelets for Photoelectrochemical Water Splitting (literal)

Abstract

A new nanostructured alpha-Fe2O3 photoelectrode synthesized through plasma-enhanced chemical vapor deposition (PE-CVD) is presented. The alpha-Fe2O3 films consist of nanoplatelets with (001) crystallographic planes strongly oriented perpendicular to the conductive glass surface. This hematite morphology was never obtained before and is strictly linked to the method being used for its production. Structural, electronic, and photocurrent measurements are employed to disclose the nanoscale features of the photoanodes and their relationships with the generated photocurrent. alpha-Fe2O3 films have a hierarchical morphology consisting of nanobranches (width similar to 10 nm, length similar to 50 nm) that self-organize in plume-like nanoplatelets (350-700 nm in length). The amount of precursor used in the PE-CVD process mainly affects the nanoplatelets dimension, the platelets density, the roughness, and the photoelectrochemical (PEC) activity. The highest photocurrent (j = 1.39 mA/cm(2) at 1.55 V-RHE) is shown by the photoanodes with the best balance between the platelets density and roughness. The so obtained hematite hierarchical morphology assures good photocurrent performance and appears to be an ideal platform for the construction of customized multilayer architecture for PEC water splitting. (literal)

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