Abstract
Zinc orthogermanate was prepared via a hydrothermal method and a remarkable synergistic effect on the photocatalytic activity for overall water splitting was found for Zn2GeO4 co-loaded with noble metals (Pt, Rh, Pd, Au) and metal oxides (RuO2, IrO2). The photocatalytic activity of Pt-RuO2/Zn2GeO4 for overall water splitting is 2.2 times of Pt/Zn2GeO4 and 3.3 times of RuO2/Zn2GeO4. Photocatalytic half reactions evaluation of water splitting for H2 and O2 productions shows that Pt plays the major roles in H2 production and RuO2 promotes the O2 production. The roles and valence states of co-catalysts and the mechanism of photocatalytic reaction are discussed.
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