Photocatalytic hydrogen evolution using nanocrystalline gallium oxynitride spinel

H. A.Naveen Dharmagunawardhane; William R. Woerner; Quiyan Wu; Huafeng Huang; Xianyin Chen; Alexander Orlov; Peter G. Khalifah; John B. Parise

doi:10.1039/c4ta03676j

Photocatalytic hydrogen evolution using nanocrystalline gallium oxynitride spinel

H. A.Naveen Dharmagunawardhane
, William R. Woerner
, Quiyan Wu
, Huafeng Huang
, Xianyin Chen
, Alexander Orlov
, Peter G. Khalifah
, John B. Parise

Stony Brook University

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

31 Scopus citations

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 (E_g) in the visible region (E_g = 2.50 eV) which is ascribed to photoexcitations from the N 2p valence states. A direct gap has an onset at ultraviolet energies (E_g = 3.69 eV), which is ascribed to photoexcitations from lower energy O 2p valence states.

Original language	English
Pages (from-to)	19247-19252
Number of pages	6
Journal	Journal of Materials Chemistry A
Volume	2
Issue number	45
DOIs	https://doi.org/10.1039/c4ta03676j
State	Published - Dec 7 2014

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title = "Photocatalytic hydrogen evolution using nanocrystalline gallium oxynitride spinel",

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.",

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doi = "10.1039/c4ta03676j",

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T1 - Photocatalytic hydrogen evolution using nanocrystalline gallium oxynitride spinel

AU - Dharmagunawardhane, H. A.Naveen

AU - Woerner, William R.

AU - Wu, Quiyan

AU - Huang, Huafeng

AU - Chen, Xianyin

AU - Orlov, Alexander

AU - Khalifah, Peter G.

AU - Parise, John B.

PY - 2014/12/7

Y1 - 2014/12/7

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/84908456449

U2 - 10.1039/c4ta03676j

DO - 10.1039/c4ta03676j

M3 - Article

AN - SCOPUS:84908456449

SN - 2050-7488

VL - 2

SP - 19247

EP - 19252

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

IS - 45

ER -

Photocatalytic hydrogen evolution using nanocrystalline gallium oxynitride spinel

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