Template-free nanostructured fluorine-doped tin oxide scaffolds for photoelectrochemical water splitting

Ivan Garcia-Torregrosa; Jochem H.J.  Wijten; Silvia Zanoni; Freddy Oropeza Palacio; Jan Philipp Hofmann; Emiel Hensen; Bert M. Weckhuysen

doi:10.1021/acsami.9b05176

Template-free nanostructured fluorine-doped tin oxide scaffolds for photoelectrochemical water splitting

Ivan Garcia-Torregrosa, Jochem H.J. Wijten, Silvia Zanoni, Freddy Oropeza Palacio, Jan Philipp Hofmann, Emiel Hensen, Bert M. Weckhuysen (Corresponding author)

Inorganic Materials & Catalysis

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

4 Citations (Scopus)

34 Downloads (Pure)

Abstract

The synthesis and characterization of highly stable and conductive F:SnO ₂ (FTO) nanopyramid arrays are investigated, and their use as scaffolds for water splitting is demonstrated. Current densities during the oxygen evolution reaction with a NiFeO _x catalyst at 2 V vs reversible hydrogen electrode were increased 5-fold when substituting commercial FTO (TEC 15) by nanostructured FTO scaffolds. In addition, thin α-Fe ₂O ₃ films (∼50 nm thick) were employed as a proof of concept to show the effect of our nanostructured scaffolds during photoelectrochemical water splitting. Double-layer capacitance measurements showed a drastic increase of the relative electrochemically active surface area for the nanostructured samples, in agreement with the observed photocurrent enhancement, whereas UV-vis spectroscopy indicates full absorption of visible light at wavelengths below 600 nm.

Original language	English
Pages (from-to)	36485-36496
Number of pages	12
Journal	ACS Applied Materials & Interfaces
Volume	11
Issue number	40
DOIs	https://doi.org/10.1021/acsami.9b05176
Publication status	Published - 9 Oct 2019

Keywords

nanostructuring
photoelectrode
spectroscopy
spray pyrolysis
water splitting

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10.1021/acsami.9b05176

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title = "Template-free nanostructured fluorine-doped tin oxide scaffolds for photoelectrochemical water splitting",

abstract = "The synthesis and characterization of highly stable and conductive F:SnO 2 (FTO) nanopyramid arrays are investigated, and their use as scaffolds for water splitting is demonstrated. Current densities during the oxygen evolution reaction with a NiFeO x catalyst at 2 V vs reversible hydrogen electrode were increased 5-fold when substituting commercial FTO (TEC 15) by nanostructured FTO scaffolds. In addition, thin α-Fe 2O 3 films (∼50 nm thick) were employed as a proof of concept to show the effect of our nanostructured scaffolds during photoelectrochemical water splitting. Double-layer capacitance measurements showed a drastic increase of the relative electrochemically active surface area for the nanostructured samples, in agreement with the observed photocurrent enhancement, whereas UV-vis spectroscopy indicates full absorption of visible light at wavelengths below 600 nm. ",

keywords = "nanostructuring, photoelectrode, spectroscopy, spray pyrolysis, water splitting",

author = "Ivan Garcia-Torregrosa and Wijten, {Jochem H.J.} and Silvia Zanoni and {Oropeza Palacio}, Freddy and Hofmann, {Jan Philipp} and Emiel Hensen and Weckhuysen, {Bert M.}",

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Template-free nanostructured fluorine-doped tin oxide scaffolds for photoelectrochemical water splitting. / Garcia-Torregrosa, Ivan; Wijten, Jochem H.J. ; Zanoni, Silvia; Oropeza Palacio, Freddy; Hofmann, Jan Philipp ; Hensen, Emiel; Weckhuysen, Bert M. (Corresponding author).

In: ACS Applied Materials & Interfaces, Vol. 11, No. 40, 09.10.2019, p. 36485-36496.

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

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AU - Wijten, Jochem H.J.

AU - Zanoni, Silvia

AU - Oropeza Palacio, Freddy

AU - Hofmann, Jan Philipp

AU - Hensen, Emiel

AU - Weckhuysen, Bert M.

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AB - The synthesis and characterization of highly stable and conductive F:SnO 2 (FTO) nanopyramid arrays are investigated, and their use as scaffolds for water splitting is demonstrated. Current densities during the oxygen evolution reaction with a NiFeO x catalyst at 2 V vs reversible hydrogen electrode were increased 5-fold when substituting commercial FTO (TEC 15) by nanostructured FTO scaffolds. In addition, thin α-Fe 2O 3 films (∼50 nm thick) were employed as a proof of concept to show the effect of our nanostructured scaffolds during photoelectrochemical water splitting. Double-layer capacitance measurements showed a drastic increase of the relative electrochemically active surface area for the nanostructured samples, in agreement with the observed photocurrent enhancement, whereas UV-vis spectroscopy indicates full absorption of visible light at wavelengths below 600 nm.

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