Enhancement of visible-light photocatalytic activity of Pt supported potassium niobate (Pt-KNbO3) by up-conversion luminescence agent (Er3+:Y3Al5O12) for hydrogen evolution from aqueous methanol solution

Yuwei Guo, Yun Li, Shuguang Li, Lei Zhang, Ying Li and Jun Wang

Energy, 2015, vol. 82, issue C, 72-79

Abstract: In this paper, a high effective up-conversion luminescence agent (Er3+:Y3Al5O12) is synthesized by sol–gel method, and then its corresponding visible-light photocatalysts (Er3+:Y3Al5O12/Pt-KNbO3) are successfully prepared by hydrothermal and direct mixing methods. For comparison, Er3+:Y3Al5O12, Pt-KNbO3 and Er3+:Y3Al5O12/Pt-KNbO3 are all characterized by XRD (X-ray diffractometer), SEM(scanning electron microscopy) and EDX(energy dispersive X-ray spectroscopy ). At first, the visible-light photocatalytic activity of Er3+:Y3Al5O12/Pt-KNbO3 is examined through photocatalytic hydrogen evolution from aqueous methanol solution under visible-light irradiation. Lastly, the influence factors such as Er3+:Y3Al5O12 and Pt-KNbO3 mass ratio, heat-treated temperature and initial pH value on the visible-light photocatalytic hydrogen evolution activity of Er3+:Y3Al5O12/Pt-KNbO3 are studied. Particularly, Er3+:Y3Al5O12/Pt-KNbO3 catalysts with 0.5:1.0 mass ratio heat-treated at 500 °C in aqueous methanol solution with initial pH = 6.0 show the highest photocatalytic activity in hydrogen evolution from aqueous methanol solution.

Keywords: Pt-supported potassium niobate (Pt-KNbO3); Up-conversion luminescence agent (Er3+:Y3Al5O12); Visible-light photocatalyst; Methanol splitting; Hydrogen evolution (search for similar items in EconPapers)
Date: 2015
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:82:y:2015:i:c:p:72-79

DOI: 10.1016/j.energy.2014.12.071

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