Tampere University of Technology

TUTCRIS Research Portal

Graphene-intercalated Fe2O3/TiO2 heterojunctions for efficient photoelectrolysis of water

Research output: Contribution to journalArticleScientificpeer-review

Standard

Graphene-intercalated Fe2O3/TiO2 heterojunctions for efficient photoelectrolysis of water. / Kaouk, A.; Ruoko, T. P.; Gönüllü, Y.; Kaunisto, K.; Mettenbörger, A.; Gurevich, E.; Lemmetyinen, H.; Ostendorf, A.; Mathur, S.

In: RSC Advances, Vol. 5, No. 123, 13.11.2015, p. 101401-101407.

Research output: Contribution to journalArticleScientificpeer-review

Harvard

Kaouk, A, Ruoko, TP, Gönüllü, Y, Kaunisto, K, Mettenbörger, A, Gurevich, E, Lemmetyinen, H, Ostendorf, A & Mathur, S 2015, 'Graphene-intercalated Fe2O3/TiO2 heterojunctions for efficient photoelectrolysis of water', RSC Advances, vol. 5, no. 123, pp. 101401-101407. https://doi.org/10.1039/c5ra18330h

APA

Kaouk, A., Ruoko, T. P., Gönüllü, Y., Kaunisto, K., Mettenbörger, A., Gurevich, E., ... Mathur, S. (2015). Graphene-intercalated Fe2O3/TiO2 heterojunctions for efficient photoelectrolysis of water. RSC Advances, 5(123), 101401-101407. https://doi.org/10.1039/c5ra18330h

Vancouver

Kaouk A, Ruoko TP, Gönüllü Y, Kaunisto K, Mettenbörger A, Gurevich E et al. Graphene-intercalated Fe2O3/TiO2 heterojunctions for efficient photoelectrolysis of water. RSC Advances. 2015 Nov 13;5(123):101401-101407. https://doi.org/10.1039/c5ra18330h

Author

Kaouk, A. ; Ruoko, T. P. ; Gönüllü, Y. ; Kaunisto, K. ; Mettenbörger, A. ; Gurevich, E. ; Lemmetyinen, H. ; Ostendorf, A. ; Mathur, S. / Graphene-intercalated Fe2O3/TiO2 heterojunctions for efficient photoelectrolysis of water. In: RSC Advances. 2015 ; Vol. 5, No. 123. pp. 101401-101407.

Bibtex - Download

@article{13fb8052bcb548948ca3641ef9594d33,
title = "Graphene-intercalated Fe2O3/TiO2 heterojunctions for efficient photoelectrolysis of water",
abstract = "Interfacial modification of α-Fe2O3/TiO2 multilayer photoanodes by intercalating few-layer graphene (FLG) was found to improve water splitting efficiency due to superior transport properties, when compared to individual iron and titanium oxides and heterojunctions thereof. Both metal oxides and graphene sheets were grown by plasma-enhanced chemical vapor deposition. Compared to the onset potential achieved for α-Fe2O3 films (1 V vs. RHE), the α-Fe2O3/TiO2 bilayer structure yielded a better onset potential (0.3 V vs. RHE). Heterojunctioned bilayers exhibited a higher photocurrent density (0.32 mA cm-2 at 1.23 V vs. RHE) than the single α-Fe2O3 layer (0.22 mA cm-2 at 1.23 V vs. RHE), indicating more efficient light harvesting and higher concentration of photogenerated charge carriers. For more efficient charge transport at the interface, a few layer graphene sheet was intercalated into the α-Fe2O3/TiO2 interface, which substantially increased the photocurrent density to 0.85 mA cm-2 (1.23 V vs. RHE) and shifted the onset potential (0.25 V vs. RHE). Ultrafast transient absorption spectroscopy studies indicated that the incorporation of FLG between the α-Fe2O3 and TiO2 layers resulted in reduced recombination in the α-Fe2O3 layer. The results showed that graphene intercalation improved the charge separation and the photocurrent density of the FTO/α-Fe2O3/FLG/TiO2 system.",
author = "A. Kaouk and Ruoko, {T. P.} and Y. G{\"o}n{\"u}ll{\"u} and K. Kaunisto and A. Mettenb{\"o}rger and E. Gurevich and H. Lemmetyinen and A. Ostendorf and S. Mathur",
year = "2015",
month = "11",
day = "13",
doi = "10.1039/c5ra18330h",
language = "English",
volume = "5",
pages = "101401--101407",
journal = "RSC Advances",
issn = "2046-2069",
publisher = "Royal Society of Chemistry",
number = "123",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Graphene-intercalated Fe2O3/TiO2 heterojunctions for efficient photoelectrolysis of water

AU - Kaouk, A.

AU - Ruoko, T. P.

AU - Gönüllü, Y.

AU - Kaunisto, K.

AU - Mettenbörger, A.

AU - Gurevich, E.

AU - Lemmetyinen, H.

AU - Ostendorf, A.

AU - Mathur, S.

PY - 2015/11/13

Y1 - 2015/11/13

N2 - Interfacial modification of α-Fe2O3/TiO2 multilayer photoanodes by intercalating few-layer graphene (FLG) was found to improve water splitting efficiency due to superior transport properties, when compared to individual iron and titanium oxides and heterojunctions thereof. Both metal oxides and graphene sheets were grown by plasma-enhanced chemical vapor deposition. Compared to the onset potential achieved for α-Fe2O3 films (1 V vs. RHE), the α-Fe2O3/TiO2 bilayer structure yielded a better onset potential (0.3 V vs. RHE). Heterojunctioned bilayers exhibited a higher photocurrent density (0.32 mA cm-2 at 1.23 V vs. RHE) than the single α-Fe2O3 layer (0.22 mA cm-2 at 1.23 V vs. RHE), indicating more efficient light harvesting and higher concentration of photogenerated charge carriers. For more efficient charge transport at the interface, a few layer graphene sheet was intercalated into the α-Fe2O3/TiO2 interface, which substantially increased the photocurrent density to 0.85 mA cm-2 (1.23 V vs. RHE) and shifted the onset potential (0.25 V vs. RHE). Ultrafast transient absorption spectroscopy studies indicated that the incorporation of FLG between the α-Fe2O3 and TiO2 layers resulted in reduced recombination in the α-Fe2O3 layer. The results showed that graphene intercalation improved the charge separation and the photocurrent density of the FTO/α-Fe2O3/FLG/TiO2 system.

AB - Interfacial modification of α-Fe2O3/TiO2 multilayer photoanodes by intercalating few-layer graphene (FLG) was found to improve water splitting efficiency due to superior transport properties, when compared to individual iron and titanium oxides and heterojunctions thereof. Both metal oxides and graphene sheets were grown by plasma-enhanced chemical vapor deposition. Compared to the onset potential achieved for α-Fe2O3 films (1 V vs. RHE), the α-Fe2O3/TiO2 bilayer structure yielded a better onset potential (0.3 V vs. RHE). Heterojunctioned bilayers exhibited a higher photocurrent density (0.32 mA cm-2 at 1.23 V vs. RHE) than the single α-Fe2O3 layer (0.22 mA cm-2 at 1.23 V vs. RHE), indicating more efficient light harvesting and higher concentration of photogenerated charge carriers. For more efficient charge transport at the interface, a few layer graphene sheet was intercalated into the α-Fe2O3/TiO2 interface, which substantially increased the photocurrent density to 0.85 mA cm-2 (1.23 V vs. RHE) and shifted the onset potential (0.25 V vs. RHE). Ultrafast transient absorption spectroscopy studies indicated that the incorporation of FLG between the α-Fe2O3 and TiO2 layers resulted in reduced recombination in the α-Fe2O3 layer. The results showed that graphene intercalation improved the charge separation and the photocurrent density of the FTO/α-Fe2O3/FLG/TiO2 system.

UR - http://www.scopus.com/inward/record.url?scp=84948652698&partnerID=8YFLogxK

U2 - 10.1039/c5ra18330h

DO - 10.1039/c5ra18330h

M3 - Article

VL - 5

SP - 101401

EP - 101407

JO - RSC Advances

JF - RSC Advances

SN - 2046-2069

IS - 123

ER -