Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
Journal Home About Issues in Progress Current Issue All Issues Feature Issues

Photoelectrochemical hydrogen generation with linear gradient Al composition dodecagon faceted AlGaN/n-GaN electrode

W. C. Lai, M. H. Ma, B. K. Lin, B. H. Hsieh, Y. R. Wu, and J. K. Sheu

Open Access Open Access

Abstract

We demonstrated photoelectrochemical cells (PECs) with dodecagon faceted AlGaN/n-GaN heterostructure electrode for H2 generation, where the AlGaN/n-GaN heterostructure has a linear gradient Al composition (LGAC). The separation efficiency of the photo-generated electron–hole pairs in the electrode performs a key function in the H2 generation efficiency of PEC cells. The linear gradient Al composition, AlGaN, could create more internal field and light absorption because of the linear graded band gap. Therefore, the zero-bias photocurrent density of PEC cells with dodecagon facet LGAC AlGaN/n-GaN heterostructure electrode is around 5.9 times larger than that of dodecagon faceted n-GaN electrode.

© 2014 Optical Society of America

Full Article  |  PDF Article
More Like This
Immersed finger-type indium tin oxide ohmic contacts on p-GaN photoelectrodes for photoelectrochemical hydrogen generation

Shu-Yen Liu, J. K. Sheu, M. L. Lee, Yu-Chuan Lin, S. J. Tu, F. W. Huang, and W. C. Lai
Opt. Express 20(S2) A190-A196 (2012)

Hydrogen gas generation using n-GaN photoelectrodes with immersed Indium Tin Oxide ohmic contacts

Shu-Yen Liu, Yu-Chuan Lin, Jhao-Cheng Ye, S. J. Tu, F. W. Huang, M. L. Lee, W. C. Lai, and J. K. Sheu
Opt. Express 19(S6) A1196-A1201 (2011)

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

Shu-Yen Liu, J. K. Sheu, Yu-Chuan Lin, S. J. Tu, F. W. Huang, M. L. Lee, and W. C. Lai
Opt. Express 20(S5) A678-A683 (2012)

View More...

Supplementary Material (1)

Media 1: MP4 (11150 KB)     

Cited By

Optica participates in Crossref's Cited-By Linking service. Citing articles from Optica Publishing Group journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (5)
Fig. 1
Fig. 1 Surface morphology SEM images of (a) faceted n-GaN, (b) CAC AlGaN/n-GaN, and (c) LGAC AlGaN/GaN electrode (d) The TEM cross-section image cut on the rough surface of the dodecagon faceted n-GaN structure and its corresponding SADP with z = [1-100]. (e) The TEM cross-section image cut on the smooth surface of the dodecagon faceted n-GaN structure and its corresponding SADP with z = [11–20].

Download Full Size | PDF

Fig. 2
Fig. 2 (a) Dark and (b) illuminated current densities of PECs I, II, III, and IV as a function of Potential vs. Ag/AgCl (Vext).

Download Full Size | PDF

Fig. 3
Fig. 3 Gas generation picture of the PECs I and IV under illumination. Left side of picture is PECs IV and right side of picture is PECs I. Both PECs are generating H2 gas at the Pt cathode (see Media 1).

Download Full Size | PDF

Fig. 4
Fig. 4 Schematic (a) band diagrams, (b) Ec and Ev electric field of electrolyte and dodecagon faceted n-GaN, dodecagon faceted CAC AlGaN/n-GaN heterostructure, and dodecagon faceted LGAC AlGaN/n-GaN heterostructure electrodes interface.

Download Full Size | PDF

Fig. 5
Fig. 5 Surface morphology SEM images of (a) PECs I, (b) PECs II, (c) PECs III, and (d) PECs IV after the Jp-Vext characteristics measurement.

Download Full Size | PDF

Select as filters
Select Topics Cancel
Top
       
© Copyright 2024 | Optica Publishing Group. All rights reserved, including rights for text and data mining and training of artificial technologies or similar technologies.
Privacy | Terms of Use