Surface Modification of Tungsten Oxide-Based Photoanodes for Solar-Powered Hydrogen Production

N. Gaillard; J. Kaneshiro; E. L. Miller; L. Weinhardt; M. Bär; C. Heske; K. S. Ahn; Y. Yan; M. M. Al-Jassim

doi:10.1557/PROC-1171-S02-01

Surface Modification of Tungsten Oxide-Based Photoanodes for Solar-Powered Hydrogen Production

N. Gaillard, J. Kaneshiro, E. L. Miller, L. Weinhardt, M. Bär, C. Heske, K. S. Ahn, Y. Yan, M. M. Al-Jassim

Materials Science

Research output: Contribution to conference › Paper › peer-review

Abstract

We report on the development of tungsten-oxide-based photoelectrochemical (PEC) water-splitting electrodes using surface modification techniques. The effect of molybdenum incorporation into the WO₃ bulk or the surface region of the film is discussed. Our data indicate that Mo incorporation in the entire film (WO₃:Mo) results in poor PEC performances, most likely due to defects that trap photo-generated charge carriers. However, compared to a pure WO₃ (WO₃:Mo)-based PEC electrode, a 20% (100%) increase of the photocurrent density at 1.6 V vs. SCE is observed if the Mo incorporation is limited to the near-surface region of the WO₃ film. The resulting WO₃:Mo/WO₃ bilayer structure is formed by epitaxial growth of the WO₃:Mo top layer on the WO₃ bottom layer, which allows an optimization of the electronic structure induced by Mo incorporation while maintaining good crystallographic properties.

Original language	American English
Pages	42-47
Number of pages	6
DOIs	https://doi.org/10.1557/PROC-1171-S02-01 https://doi.org/10.1557/proc-1171-s02-01
State	Published - 2009
Event	2009 MRS Spring Meeting - San Francisco, CA, United States Duration: 13 Apr 2009 → 17 Apr 2009

Conference

Conference	2009 MRS Spring Meeting
Country/Territory	United States
City	San Francisco, CA
Period	13/04/09 → 17/04/09

NREL Publication Number

NREL/JA-520-48480

Keywords

photochemical
physical vapor deposition
semiconducting

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Gaillard, N., Kaneshiro, J., Miller, E. L., Weinhardt, L., Bär, M., Heske, C., Ahn, K. S., Yan, Y., & Al-Jassim, M. M. (2009). Surface Modification of Tungsten Oxide-Based Photoanodes for Solar-Powered Hydrogen Production. 42-47. Paper presented at 2009 MRS Spring Meeting, San Francisco, CA, United States. https://doi.org/10.1557/PROC-1171-S02-01, https://doi.org/10.1557/proc-1171-s02-01

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abstract = "We report on the development of tungsten-oxide-based photoelectrochemical (PEC) water-splitting electrodes using surface modification techniques. The effect of molybdenum incorporation into the WO3 bulk or the surface region of the film is discussed. Our data indicate that Mo incorporation in the entire film (WO3:Mo) results in poor PEC performances, most likely due to defects that trap photo-generated charge carriers. However, compared to a pure WO3 (WO3:Mo)-based PEC electrode, a 20% (100%) increase of the photocurrent density at 1.6 V vs. SCE is observed if the Mo incorporation is limited to the near-surface region of the WO3 film. The resulting WO3:Mo/WO3 bilayer structure is formed by epitaxial growth of the WO3:Mo top layer on the WO3 bottom layer, which allows an optimization of the electronic structure induced by Mo incorporation while maintaining good crystallographic properties.",

keywords = "photochemical, physical vapor deposition, semiconducting",

author = "N. Gaillard and J. Kaneshiro and Miller, {E. L.} and L. Weinhardt and M. B{\"a}r and C. Heske and Ahn, {K. S.} and Y. Yan and Al-Jassim, {M. M.}",

year = "2009",

doi = "10.1557/PROC-1171-S02-01",

language = "American English",

pages = "42--47",

note = "2009 MRS Spring Meeting ; Conference date: 13-04-2009 Through 17-04-2009",

}

Gaillard, N, Kaneshiro, J, Miller, EL, Weinhardt, L, Bär, M, Heske, C, Ahn, KS, Yan, Y & Al-Jassim, MM 2009, 'Surface Modification of Tungsten Oxide-Based Photoanodes for Solar-Powered Hydrogen Production', Paper presented at 2009 MRS Spring Meeting, San Francisco, CA, United States, 13/04/09 - 17/04/09 pp. 42-47. https://doi.org/10.1557/PROC-1171-S02-01, https://doi.org/10.1557/proc-1171-s02-01

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AU - Gaillard, N.

AU - Kaneshiro, J.

AU - Miller, E. L.

AU - Weinhardt, L.

AU - Bär, M.

AU - Heske, C.

AU - Ahn, K. S.

AU - Yan, Y.

AU - Al-Jassim, M. M.

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N2 - We report on the development of tungsten-oxide-based photoelectrochemical (PEC) water-splitting electrodes using surface modification techniques. The effect of molybdenum incorporation into the WO3 bulk or the surface region of the film is discussed. Our data indicate that Mo incorporation in the entire film (WO3:Mo) results in poor PEC performances, most likely due to defects that trap photo-generated charge carriers. However, compared to a pure WO3 (WO3:Mo)-based PEC electrode, a 20% (100%) increase of the photocurrent density at 1.6 V vs. SCE is observed if the Mo incorporation is limited to the near-surface region of the WO3 film. The resulting WO3:Mo/WO3 bilayer structure is formed by epitaxial growth of the WO3:Mo top layer on the WO3 bottom layer, which allows an optimization of the electronic structure induced by Mo incorporation while maintaining good crystallographic properties.

AB - We report on the development of tungsten-oxide-based photoelectrochemical (PEC) water-splitting electrodes using surface modification techniques. The effect of molybdenum incorporation into the WO3 bulk or the surface region of the film is discussed. Our data indicate that Mo incorporation in the entire film (WO3:Mo) results in poor PEC performances, most likely due to defects that trap photo-generated charge carriers. However, compared to a pure WO3 (WO3:Mo)-based PEC electrode, a 20% (100%) increase of the photocurrent density at 1.6 V vs. SCE is observed if the Mo incorporation is limited to the near-surface region of the WO3 film. The resulting WO3:Mo/WO3 bilayer structure is formed by epitaxial growth of the WO3:Mo top layer on the WO3 bottom layer, which allows an optimization of the electronic structure induced by Mo incorporation while maintaining good crystallographic properties.

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KW - physical vapor deposition

KW - semiconducting

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ER -

Surface Modification of Tungsten Oxide-Based Photoanodes for Solar-Powered Hydrogen Production

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