The diffuse reflection spectra and the photoelectrochemical properties of the ferrites ZnFe 2 O 4 , MgFe 2 O 4 , and Li 0.5 Fe 2.5 O 4 with spinel structure are presented. A marked difference between the reflection spectra and the photocurrent action spectra is discussed. The onset wavelength of the photocurrent lies at about 550 nm. Steady‐state photocurrents are severely limited by a relatively low absorptivity in the visible region and by surface recombination at low potentials. From an admittance spectra analysis, a value for the flatband potential of ZnFe 2 O 4 was obtained, viz. , −0.5V vs. SCE in 1 M NaOH .
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Haart et al. (1985) studied this question.