Issue 45, 2014
From the journal:

Journal of Materials Chemistry A

Photocatalytic hydrogen evolution using nanocrystalline gallium oxynitride spinel†

H. A. Naveen Dharmagunawardhane,a   William R. Woerner,b   Quiyan Wu,a   Huafeng Huang,c   Xianyin Chen,c   Alexander Orlov,a   Peter G. Khalifahcd  and  John B. Parise*bce  

* Corresponding authors

a Department of Materials Science and Engineering, Stony Brook University, Stony Brook, New York 11794, USA

b Department of Geosciences, Stony Brook University, Stony Brook, New York 11794, USA
E-mail: John.Parise@stonybrook.edu

c Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, USA

d Department of Chemistry, Brookhaven National Laboratory, Upton, NY, USA

e Photon Sciences, Brookhaven National Laboratory, Upton, NY, USA

Abstract

Photocatalytic hydrogen evolution from water was observed over nanocrystalline gallium oxynitride spinel under simulated solar light irradiation (320 nm < λ < 800 nm). Up to 8 μmol h−1 of H2 was evolved without co-catalyst loading. The photocatalyst was synthesized by the ammonolysis of gallium nitrate hydrate (Ga(NO3)3·xH2O). Optical measurements indicate an indirect gap (Eg) in the visible region (Eg = 2.50 eV) which is ascribed to photoexcitations from the N 2p valence states. A direct gap has an onset at ultraviolet energies (Eg = 3.69 eV), which is ascribed to photoexcitations from lower energy O 2p valence states.

Graphical abstract: Photocatalytic hydrogen evolution using nanocrystalline gallium oxynitride spinel

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Article information

DOI
https://doi.org/10.1039/C4TA03676J
Article type
Paper
Submitted
17 Jul 2014
Accepted
07 Oct 2014
First published
07 Oct 2014

J. Mater. Chem. A, 2014,2, 19247-19252

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Photocatalytic hydrogen evolution using nanocrystalline gallium oxynitride spinel

H. A. N. Dharmagunawardhane, W. R. Woerner, Q. Wu, H. Huang, X. Chen, A. Orlov, P. G. Khalifah and J. B. Parise, J. Mater. Chem. A, 2014, 2, 19247 DOI: 10.1039/C4TA03676J

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