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A range of transition-metal oxynitrides and a nitride were examined as potential photocatalysts active under visible light. (Oxy)nitrides based on tantalum, niobium and titanium are found to absorb visible light (λ ≤ 600 nm), and some of them are found to evolve H2 or O2 from aqueous solutions containing a sacrificial electron donor (CH3OH) or acceptor (Ag+), respectively, via band gap excitation without noticeable photo-degradation of the catalyst itself.
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Hitoki et al. (2002) studied this question.
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