Abstract
Zn1−xFexOy nanocomposites have been investigated for bi-functional performance towards photoelectrochemical (PEC) and photocatalytic (PC) splitting of water to produce hydrogen. Prepared at varying Zn/Fe atomic ratio via co-precipitation through controlled addition of NH4OH to the aqueous solution of iron (III) nitrate nonahydrate [Fe(NO3)3·9H2O] and zinc acetate dihydrate [(CH3·COO)2Zn·2H2O], followed by sintering in air at 800 °C, the nanocomposites were characterized by XRD, SEM, TEM, UV–Visible optical absorption, XPS, and Mossbauer spectral analysis. Shift in bandgap energy (Eg) and alterations in microstructural characteristics and electrical properties, observed with change in sample-composition, significantly influenced hydrogen generation. Plausible reasons have been offered. The optimum conditions for hydrogen generation via PEC and PC routes, not being similar, have also been worked out.
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