Photocatalytic hydrogen evolution using nanocrystalline gallium oxynitride spinel

被引:29
作者
Dharmagunawardhane, H. A. Naveen [1 ]
Woerner, William R. [2 ]
Wu, Quiyan [1 ]
Huang, Huafeng [3 ]
Chen, Xianyin [3 ]
Orlov, Alexander [1 ]
Khalifah, Peter G. [3 ,4 ]
Parise, John B. [2 ,3 ,5 ]
机构
[1] SUNY Stony Brook, Dept Mat Sci & Engn, Stony Brook, NY 11794 USA
[2] SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11794 USA
[3] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA
[4] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA
[5] Brookhaven Natl Lab, Upton, NY 11973 USA
基金
美国国家科学基金会;
关键词
VISIBLE-LIGHT IRRADIATION; HIGH-PRESSURE SYNTHESIS; SOLID-SOLUTION; OXONITRIDE; NITRIDE; LATIO2N; FILMS; ZNO; GAN;
D O I
10.1039/c4ta03676j
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Photocatalytic hydrogen evolution from water was observed over nanocrystalline gallium oxynitride spinel under simulated solar light irradiation (320 nm < lambda < 800 nm). Up to 8 mu mol h(-1) of H-2 was evolved without co-catalyst loading. The photocatalyst was synthesized by the ammonolysis of gallium nitrate hydrate (Ga(NO3)(3)center dot xH(2)O). 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.
引用
收藏
页码:19247 / 19252
页数:6
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