Sandwich-Nanostructured n-Cu2O/AuAg/p-Cu2O Photocathode with Highly Positive Onset Potential for Improved Water Reduction

Yu Chang Lin; Liang Ching Hsu; Chia Yu Lin; Chao Lung Chiang; Che Min Chou; Wen Wei Wu; San Yuan Chen; Yan Gu Lin

doi:10.1021/acsami.9b11737

Sandwich-Nanostructured n-Cu₂O/AuAg/p-Cu₂O Photocathode with Highly Positive Onset Potential for Improved Water Reduction

Yu Chang Lin, Liang Ching Hsu, Chia Yu Lin, Chao Lung Chiang, Che Min Chou, Wen Wei Wu, San Yuan Chen^*, Yan Gu Lin

^*Corresponding author for this work

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

35 Scopus citations

Abstract

An n-Cu₂O layer formed a high-quality buried junction with p-Cu₂O to increase the photovoltage and thus to shift the turn-on voltage positively. Mott-Schottky measurements confirmed that the improvement benefited from a positive shift in flat-band potential. The obtained extremely positive onset potential, 0.8 V_RHE in n-Cu₂O/AuAg/p-Cu₂O, is comparable with measurements from water reduction catalysts. The AuAg alloy sandwiched between the homojunction of n-Cu₂O and p-Cu₂O improved the photocatalytic performance. This alloy both served as an electron relay and promoted electron-hole pair generation in nearby semiconductors; the charge transfer between n-Cu₂O and p-Cu₂O in the sandwich structure was measured with X-ray absorption spectra. The proposed sandwich structure can be considered as a new direction for the design of efficient solar-related devices.

Original language	English
Pages (from-to)	38625-38632
Number of pages	8
Journal	ACS Applied Materials and Interfaces
Volume	11
Issue number	42
DOIs	https://doi.org/10.1021/acsami.9b11737
State	Published - 23 Oct 2019

Keywords

copper(I) oxide
localized surface plasmon resonance
photocathode
sandwich structure
solar water splitting

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Access to Document

10.1021/acsami.9b11737

Cite this

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title = "Sandwich-Nanostructured n-Cu2O/AuAg/p-Cu2O Photocathode with Highly Positive Onset Potential for Improved Water Reduction",

abstract = "An n-Cu2O layer formed a high-quality buried junction with p-Cu2O to increase the photovoltage and thus to shift the turn-on voltage positively. Mott-Schottky measurements confirmed that the improvement benefited from a positive shift in flat-band potential. The obtained extremely positive onset potential, 0.8 VRHE in n-Cu2O/AuAg/p-Cu2O, is comparable with measurements from water reduction catalysts. The AuAg alloy sandwiched between the homojunction of n-Cu2O and p-Cu2O improved the photocatalytic performance. This alloy both served as an electron relay and promoted electron-hole pair generation in nearby semiconductors; the charge transfer between n-Cu2O and p-Cu2O in the sandwich structure was measured with X-ray absorption spectra. The proposed sandwich structure can be considered as a new direction for the design of efficient solar-related devices.",

keywords = "copper(I) oxide, localized surface plasmon resonance, photocathode, sandwich structure, solar water splitting",

author = "Lin, {Yu Chang} and Hsu, {Liang Ching} and Lin, {Chia Yu} and Chiang, {Chao Lung} and Chou, {Che Min} and Wu, {Wen Wei} and Chen, {San Yuan} and Lin, {Yan Gu}",

note = "Publisher Copyright: Copyright {\textcopyright} 2019 American Chemical Society.",

year = "2019",

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doi = "10.1021/acsami.9b11737",

language = "English",

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T1 - Sandwich-Nanostructured n-Cu2O/AuAg/p-Cu2O Photocathode with Highly Positive Onset Potential for Improved Water Reduction

AU - Lin, Yu Chang

AU - Hsu, Liang Ching

AU - Lin, Chia Yu

AU - Chiang, Chao Lung

AU - Chou, Che Min

AU - Wu, Wen Wei

AU - Chen, San Yuan

AU - Lin, Yan Gu

PY - 2019/10/23

Y1 - 2019/10/23

N2 - An n-Cu2O layer formed a high-quality buried junction with p-Cu2O to increase the photovoltage and thus to shift the turn-on voltage positively. Mott-Schottky measurements confirmed that the improvement benefited from a positive shift in flat-band potential. The obtained extremely positive onset potential, 0.8 VRHE in n-Cu2O/AuAg/p-Cu2O, is comparable with measurements from water reduction catalysts. The AuAg alloy sandwiched between the homojunction of n-Cu2O and p-Cu2O improved the photocatalytic performance. This alloy both served as an electron relay and promoted electron-hole pair generation in nearby semiconductors; the charge transfer between n-Cu2O and p-Cu2O in the sandwich structure was measured with X-ray absorption spectra. The proposed sandwich structure can be considered as a new direction for the design of efficient solar-related devices.

AB - An n-Cu2O layer formed a high-quality buried junction with p-Cu2O to increase the photovoltage and thus to shift the turn-on voltage positively. Mott-Schottky measurements confirmed that the improvement benefited from a positive shift in flat-band potential. The obtained extremely positive onset potential, 0.8 VRHE in n-Cu2O/AuAg/p-Cu2O, is comparable with measurements from water reduction catalysts. The AuAg alloy sandwiched between the homojunction of n-Cu2O and p-Cu2O improved the photocatalytic performance. This alloy both served as an electron relay and promoted electron-hole pair generation in nearby semiconductors; the charge transfer between n-Cu2O and p-Cu2O in the sandwich structure was measured with X-ray absorption spectra. The proposed sandwich structure can be considered as a new direction for the design of efficient solar-related devices.

KW - copper(I) oxide

KW - localized surface plasmon resonance

KW - photocathode

KW - sandwich structure

KW - solar water splitting

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