A Study upon PhotoOxidation of Water Using Nanocrystalline Osmium Oxide under Visible Light

Publish Year: 1391
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:

NATURE01_614

تاریخ نمایه سازی: 31 فروردین 1392

Abstract:

The photoelectrolysis of water to yield hydrogen and oxygen using visible light has enormous potential for solar energy harvesting if suitable photoelectrode materials can be developed. Few ofthe materials with a band gap suitable for visible light activation have the necessary band edge potentials or photochemical stability to be suitable candidates. Osmium oxide )Ebg =2.8 eV( is a good candidate with absorption up to λ ≈ 440 nm and known photochemical stability. Thin filmsof osmium oxide were prepared using an electrolytic route from peroxoosmium precursors. Theosmium oxide thin films were characterised by FESEM, Auger electron spectroscopy, and photoelectrochemical methods. The magnitude of the photocurrent response of the films under solar simulated irradiation showed a dependence on precursor used in the film preparation, with a comparatively lower response for samples containing impurities. The photocurrent response spectrum of the osmium oxide films was more favourable than that recorded for titanium dioxide )TiO2 ( thin films. The OsO3 photocurrent response was of equivalent magnitude but shifted intothe visible region of the spectrum, as compared to that of the TiO2 .

Authors

Kourosh Motevalli

Instructor, Applied Chemistry Department, Fundamental Sciences Faculty, Islamic Azad University

Zahra Yaghoubi

Assistant Professor, Industrial Faculty, Islamic Azad University, South Tehran Branch, Tehran, Iran,

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