Scheme 2.

Schematics of the two photoelectrochemical configurations evaluated in this work. Scheme 2A illustrates the control configuration, for which the Si wire-array electrode served as the working electrode, the Pt gauze electrode served as the counter electrode, and the Pt wire served as reference electrode. Scheme 2B illustrates the device configuration, for which the Si wire-array electrode served as the working electrode, the Ag film served as the counter electrode, and the Pt wire served as reference electrode. Both configurations employed a W-halogen ELH-type illumination source.