Abstract
The noble-metal-free Ni(OH)2 as a cocatalyst was loaded on TaON photocatalyst by a precipitation method. The characterization of XRD, SEM, HRTEM and XPS revealed that Ni species was loaded on TaON in the form of β-Ni(OH)2. The composite Ni(OH)2/TaON showed higher photocatalytic activity for hydrogen evolution (3.15μmol/h) than that of naked TaON and even higher than 0.5wt% Pt/TaON (1.48μmol/h) under visible light (λ>400nm) in the presence of methanol as a sacrificial reagent, while the weight ratio of TaON: Ni(OH)2 reached 5. The enhancement of photocatalytic activity of Ni(OH)2/TaON is attributed to the rapid electrons migration from CB of TaON to Ni(OH)2, which restrains the recombination of charge carriers generated by TaON and facilitates the hydrogen evolution.
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