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Nanoparticulate precursor route to fine particles of TaON and ZrO2–TaON solid solution and their photocatalytic activity for hydrogen evolution under visible light

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Absrtact.
Preparation of fine TaON particles is attempted to improve the photocatalytic activity for H2 evolution
from aqueous methanol solution under visible light (a > 420 nm). TaON is synthesized by nitriding
Ta2O5 powder at 1123 K for 15 h under a flow of NH3. When nanoparticulate Ta2O5 with a primary
particle size of 30–50 nm is used as the precursor, fine particles of TaON (FP-TaON) with 50–80 nm in
size is obtained, but the primary particles aggregate to form larger secondary particles. Nitridation of Zr–
Ta mixed oxide (Zr/Ta = 0.1) nanoparticles results in the production of a solid solution of monoclinic-
ZrO2 and TaON exhibiting 30–50 nm primary particle size with less aggregation and higher activity, as
compared to FP-TaON. Suppression of surface defects (reduced tantalum species) produced during
nitridation from Ta2O5 to TaON is shown to be essential for achieving efficient H2 evolution using TaONbased
photocatalysts.

Keywords: Ammonolysis, Hydrogen production, Oxynitride, Photocatalyst, Solid solution, Visible light, Water splitting.

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Informasi Detail

Judul Seri

Applied Catalysis A: General

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis A: General 357 (2009) 206–212

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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