期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 36, 页码 23729-23738出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b07599
关键词
photocatalytic H-2 production; ZnO; Ga; doping; cocatalyst; Pt
资金
- Region of Madrid [MAD2D, RESTOENE-2]
- Amarout-II PEOPLE-COFUND Marie Sklodowska-Curie Action
- Beatriu de Pinos fellowship, Agency for Management of University [BP-DGR 2014]
- Catalan Government
- Centre de Supercomputacio de Catalunya
Photocatalytic H-2 generation is investigated over a series of Ga-modified ZnO photocatalysts that were prepared by hydrothermal methods. It is found that the structural, textural, and optoelectronic properties remarkably depend on the Ga content. The photocatalytic activity is higher in samples with Ga content equal to or lower than 5.4 wt %, which are constituted by Zn1xGaxO phases. Structural, textural, and optoelectronic characterization, combined with theoretical calculations, reveals the effect of Ga in the doped ZnO structures. Higher Ga incorporation leads to the formation of an additional ZnGa2O4 phase with spinel structure. The presence of such a phase is detrimental for the textural and optoelectronic properties of the photocatalysts, leading to a decrease in H-2 production. When Pt is used as the cocatalyst, there is an increase of 1 order of magnitude in the activity with respect to the bare photocatalysts. This is a result of Pt acting as an electron scavenger, decreasing the electronhole recombination rate and boosting the H-2 evolution reaction.
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