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192 Multifunctional Photocatalytic Materials for Energy

blue), co-catalysts (red). Main metal elements constituting photocatalytic materials for hydrogen production, d 0 ions (gray), f 0 ions (yellow), d 10 ions (light Adapted from A. Kudo, Y. Miseki, Heterogeneous photocatalyst materials for water splitting, Chem. Soc. Re

Fig. 9.4