Carrier dynamics of a visible-light-responsive Ta3N5 photoanode for water oxidation

Ahmed Ziani; Ela Nurlaela; Dattatray Sadashiv Dhawale; Diego Alves Silva; Erkki Alarousu; Omar F. Mohammed; Kazuhiro Takanabe

doi:10.1039/c4cp05616g

Carrier dynamics of a visible-light-responsive Ta3N5 photoanode for water oxidation

Ahmed Ziani, Ela Nurlaela, Dattatray Sadashiv Dhawale, Diego Alves Silva, Erkki Alarousu, Omar F. Mohammed, Kazuhiro Takanabe

Research output: Contribution to journal › Article › peer-review

83 Scopus citations

Abstract

The physicochemical properties of a tantalum nitride (Ta3N5) photoanode were investigated in detail to understand the fundamental aspects associated with the photoelectrochemical (PEC) water oxidation. The Ta3N5 thin films were synthesized using DC magnetron sputtering followed by annealing in air and nitridation under ammonia (NH3). A polycrystalline structure with a dense morphology of the monoclinic Ta3N5 films was obtained. A relatively low absorption coefficient (104 to 105 cm-1) in the visible light range was measured for Ta3N5, consistent with the nature of the indirect band-gap. Ultra-fast spectroscopic measurements revealed that the Ta3N5 with different thicknesses films possess low transport properties and fast carrier recombination (<10 ps). These critical kinetic properties of Ta3N5 as a photoanode may necessitate high overpotentials to achieve appreciable photocurrents for water oxidation (onset ∼0.6 V vs. RHE). This journal is

Original language	English (US)
Pages (from-to)	2670-2677
Number of pages	8
Journal	Phys. Chem. Chem. Phys.
Volume	17
Issue number	4
DOIs	https://doi.org/10.1039/c4cp05616g
State	Published - 2015

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This reported work is supported by King Abdullah University of Science and Technology (KAUST).

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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title = "Carrier dynamics of a visible-light-responsive Ta3N5 photoanode for water oxidation",

abstract = "The physicochemical properties of a tantalum nitride (Ta3N5) photoanode were investigated in detail to understand the fundamental aspects associated with the photoelectrochemical (PEC) water oxidation. The Ta3N5 thin films were synthesized using DC magnetron sputtering followed by annealing in air and nitridation under ammonia (NH3). A polycrystalline structure with a dense morphology of the monoclinic Ta3N5 films was obtained. A relatively low absorption coefficient (104 to 105 cm-1) in the visible light range was measured for Ta3N5, consistent with the nature of the indirect band-gap. Ultra-fast spectroscopic measurements revealed that the Ta3N5 with different thicknesses films possess low transport properties and fast carrier recombination (<10 ps). These critical kinetic properties of Ta3N5 as a photoanode may necessitate high overpotentials to achieve appreciable photocurrents for water oxidation (onset ∼0.6 V vs. RHE). This journal is",

author = "Ahmed Ziani and Ela Nurlaela and Dhawale, {Dattatray Sadashiv} and Silva, {Diego Alves} and Erkki Alarousu and Mohammed, {Omar F.} and Kazuhiro Takanabe",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: This reported work is supported by King Abdullah University of Science and Technology (KAUST).",

year = "2015",

doi = "10.1039/c4cp05616g",

language = "English (US)",

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pages = "2670--2677",

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AU - Ziani, Ahmed

AU - Nurlaela, Ela

AU - Dhawale, Dattatray Sadashiv

AU - Silva, Diego Alves

AU - Alarousu, Erkki

AU - Mohammed, Omar F.

AU - Takanabe, Kazuhiro

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: This reported work is supported by King Abdullah University of Science and Technology (KAUST).

PY - 2015

Y1 - 2015

N2 - The physicochemical properties of a tantalum nitride (Ta3N5) photoanode were investigated in detail to understand the fundamental aspects associated with the photoelectrochemical (PEC) water oxidation. The Ta3N5 thin films were synthesized using DC magnetron sputtering followed by annealing in air and nitridation under ammonia (NH3). A polycrystalline structure with a dense morphology of the monoclinic Ta3N5 films was obtained. A relatively low absorption coefficient (104 to 105 cm-1) in the visible light range was measured for Ta3N5, consistent with the nature of the indirect band-gap. Ultra-fast spectroscopic measurements revealed that the Ta3N5 with different thicknesses films possess low transport properties and fast carrier recombination (<10 ps). These critical kinetic properties of Ta3N5 as a photoanode may necessitate high overpotentials to achieve appreciable photocurrents for water oxidation (onset ∼0.6 V vs. RHE). This journal is

AB - The physicochemical properties of a tantalum nitride (Ta3N5) photoanode were investigated in detail to understand the fundamental aspects associated with the photoelectrochemical (PEC) water oxidation. The Ta3N5 thin films were synthesized using DC magnetron sputtering followed by annealing in air and nitridation under ammonia (NH3). A polycrystalline structure with a dense morphology of the monoclinic Ta3N5 films was obtained. A relatively low absorption coefficient (104 to 105 cm-1) in the visible light range was measured for Ta3N5, consistent with the nature of the indirect band-gap. Ultra-fast spectroscopic measurements revealed that the Ta3N5 with different thicknesses films possess low transport properties and fast carrier recombination (<10 ps). These critical kinetic properties of Ta3N5 as a photoanode may necessitate high overpotentials to achieve appreciable photocurrents for water oxidation (onset ∼0.6 V vs. RHE). This journal is

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DO - 10.1039/c4cp05616g

M3 - Article

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SN - 1463-9076

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EP - 2677

JO - Phys. Chem. Chem. Phys.

JF - Phys. Chem. Chem. Phys.

IS - 4

ER -

Carrier dynamics of a visible-light-responsive Ta3N5 photoanode for water oxidation

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