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FESEM images showing (a) the top view and (b) the cross-sectional view of the bare ZnO-nanorod photoelectrode, and (c) the top view and (d) the cross-sectional view of the ZnO/Au-nanocomposite photoelectrode. The inset in (d) shows the magnified FESEM image of the Au nanoparticles as synthesized on the surface of the ZnO nanorods from a 0.01 mM HAuCl4·H2O aq. solution.
