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Surface Plasmon assisted CuxO photocatalyst for pure water splitting

Wen-Ting Kung, Yi-Hao Pai, Yu-Kuei Hsu, Chu-Hsuan Lin, and Chih-Ming Wang

Open Access Open Access

Abstract

In this paper, CuxO photocatalyst on plasmonic nanoporous Au film is proposed to enhancing the H2 evolution rate of pure water splitting. The nanoporous Au film can simultaneously provide surface-enhanced absorption and built-in potential. The reflection spectrum shows that the surface plasmon (SP) assisted absorption wavelength of the CuxO on the nanoporous Au film can be modified by changing the annealing temperature. It is found that the enhancement of the H2 evolution rate highly depends on the SP-assisted absorption. As the annealing temperature is 220°C, the H2 evolution rate is 58μmolhr−1 under the condition that the device area is 0.25cm2.

©2013 Optical Society of America

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Figures (6)
Fig. 1
Fig. 1 Fabrication processes of the CuxO photocatalyst on plasmonic nanoporous Au film.

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Fig. 2
Fig. 2 Optical microscopy pictures of the CuxO film for an annealing temperature of (a) 220°C and (b) 250°C, respectively. SEM pictures of the nanoporous Au film for an annealing temperature of (c) 220°C and (d) 250°C, respectively.

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Fig. 3
Fig. 3 (a) Reflectance spectrum of the CuxO photocatalyst layer on plasmonic nanoporous Au film. Black, red, blue and green solid lines indicate the annealing temperature of 200 °C, 220 °C, 230 °C and 240°C, respectively. (b) Black and red solid lines respectively indicates the emission spectrum of the tungsten lamp and the reflection spectrum of the nanoporous Au film(without CuxO photocatalyst layer).

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Fig. 4
Fig. 4 Approximate energy-band diagram of the CuxO photocatalyst on plasmonic nanoporous Au-Cu composite film for water splitting.

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Fig. 5
Fig. 5 (a) IV characteristic of the Au-Cu/CuxO heterogeneous interface for an annealing temperature of 240°C. (b) Ideality factor, n, as a function of annealing temperatures.

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Fig. 6
Fig. 6 Enhancement factor of the H2 evolution rate of the CuxO photocatalyst on plasmonic nanoporous Au film. The H2 evolution rate at each annealing temperature is normalized to CuxO on flat Au film. The H2 evolution rate of CuxO on flat Au film is 31μmolhr−1.

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Equations (1)

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n≡ q kT ∂V ∂( lnJ )
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