Mn-doped GaN as photoelectrodes for the photoelectrolysis of water under visible light

Shu Yen Liu, Jinn-Kong Sheu, Yu-Chuan Lin, S. J. Tu, F. W. Huang, M. L. Lee, Wei-Chi Lai

Research output: Contribution to journalArticle

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Abstract

Hydrogen generation through direct photoelectrolysis of water was studied using photoelectrochemical (PEC) cells made of Mn-doped GaN photoelectrodes. In addition to its absorption of the ultraviolet spectrum, Mn-doped GaN photoelectrodes could absorb photons in the visible spectrum. The photocurrents measured from PEC cells made of Mndoped GaN were at least one order higher than those measured from PEC cells made of undoped GaN-working electrodes. Under the visible light illumination and a bias voltage below 1.2 V, the Mn-doped GaN photoelectrodes could drive the water splitting reaction for hydrogen generation. However, hydrogen generation could not be achieved under the same condition wherein undoped GaN photoelectrodes were used. According to the results of the spectral responses and transmission spectra obtained from the experimental photoelectrodes, the enhanced photocurrent in the Mn-doped GaN photoelectrodes, compared with the undoped GaN photoelectrodes, was attributable to the Mn-related intermediate band within the band gap of GaN that resulted in further photon absorption.

Original languageEnglish
JournalOptics Express
Volume20
Issue number19
Publication statusPublished - 2012 Sep 10

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photocurrents
hydrogen
cells
water
water splitting
ultraviolet spectra
photons
visible spectrum
spectral sensitivity
illumination
electrodes
electric potential

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

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title = "Mn-doped GaN as photoelectrodes for the photoelectrolysis of water under visible light",
abstract = "Hydrogen generation through direct photoelectrolysis of water was studied using photoelectrochemical (PEC) cells made of Mn-doped GaN photoelectrodes. In addition to its absorption of the ultraviolet spectrum, Mn-doped GaN photoelectrodes could absorb photons in the visible spectrum. The photocurrents measured from PEC cells made of Mndoped GaN were at least one order higher than those measured from PEC cells made of undoped GaN-working electrodes. Under the visible light illumination and a bias voltage below 1.2 V, the Mn-doped GaN photoelectrodes could drive the water splitting reaction for hydrogen generation. However, hydrogen generation could not be achieved under the same condition wherein undoped GaN photoelectrodes were used. According to the results of the spectral responses and transmission spectra obtained from the experimental photoelectrodes, the enhanced photocurrent in the Mn-doped GaN photoelectrodes, compared with the undoped GaN photoelectrodes, was attributable to the Mn-related intermediate band within the band gap of GaN that resulted in further photon absorption.",
author = "Liu, {Shu Yen} and Jinn-Kong Sheu and Yu-Chuan Lin and Tu, {S. J.} and Huang, {F. W.} and Lee, {M. L.} and Wei-Chi Lai",
year = "2012",
month = "9",
day = "10",
language = "English",
volume = "20",
journal = "Optics Express",
issn = "1094-4087",
publisher = "The Optical Society",
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Mn-doped GaN as photoelectrodes for the photoelectrolysis of water under visible light. / Liu, Shu Yen; Sheu, Jinn-Kong; Lin, Yu-Chuan; Tu, S. J.; Huang, F. W.; Lee, M. L.; Lai, Wei-Chi.

In: Optics Express, Vol. 20, No. 19, 10.09.2012.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Liu, Shu Yen

AU - Sheu, Jinn-Kong

AU - Lin, Yu-Chuan

AU - Tu, S. J.

AU - Huang, F. W.

AU - Lee, M. L.

AU - Lai, Wei-Chi

PY - 2012/9/10

Y1 - 2012/9/10

N2 - Hydrogen generation through direct photoelectrolysis of water was studied using photoelectrochemical (PEC) cells made of Mn-doped GaN photoelectrodes. In addition to its absorption of the ultraviolet spectrum, Mn-doped GaN photoelectrodes could absorb photons in the visible spectrum. The photocurrents measured from PEC cells made of Mndoped GaN were at least one order higher than those measured from PEC cells made of undoped GaN-working electrodes. Under the visible light illumination and a bias voltage below 1.2 V, the Mn-doped GaN photoelectrodes could drive the water splitting reaction for hydrogen generation. However, hydrogen generation could not be achieved under the same condition wherein undoped GaN photoelectrodes were used. According to the results of the spectral responses and transmission spectra obtained from the experimental photoelectrodes, the enhanced photocurrent in the Mn-doped GaN photoelectrodes, compared with the undoped GaN photoelectrodes, was attributable to the Mn-related intermediate band within the band gap of GaN that resulted in further photon absorption.

AB - Hydrogen generation through direct photoelectrolysis of water was studied using photoelectrochemical (PEC) cells made of Mn-doped GaN photoelectrodes. In addition to its absorption of the ultraviolet spectrum, Mn-doped GaN photoelectrodes could absorb photons in the visible spectrum. The photocurrents measured from PEC cells made of Mndoped GaN were at least one order higher than those measured from PEC cells made of undoped GaN-working electrodes. Under the visible light illumination and a bias voltage below 1.2 V, the Mn-doped GaN photoelectrodes could drive the water splitting reaction for hydrogen generation. However, hydrogen generation could not be achieved under the same condition wherein undoped GaN photoelectrodes were used. According to the results of the spectral responses and transmission spectra obtained from the experimental photoelectrodes, the enhanced photocurrent in the Mn-doped GaN photoelectrodes, compared with the undoped GaN photoelectrodes, was attributable to the Mn-related intermediate band within the band gap of GaN that resulted in further photon absorption.

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