| Summary: | A tandem cell that consists of an n-type (α-Fe2O3/hematite) photoanode and a p-type (LFO:Cr/chromium-doped lanthanum iron oxide) photocathode for solar water splitting has been demonstrated and studied for its photoelectrochemically. Under two-electrode system configurations, the PEC performance of α-Fe2O3 exhibited a good photoanodic response with the highest photocurrent density achieved was 0.0047 mA and 0.066 mA cm−2 at 1.23 V (vs. LFO and LFO:Cr), respectively, as operated in 0.1 M KOH (pH 13) electrolyte. Furthermore, the tandem of (LFO and LFO:Cr) vs. α-Fe2O3 also presented a similar increase of photocurrent responses as operated in different aqueous media. At zero bias condition, the highest photocurrent constructed in a two-electrode system was 0.0022 mA cm−2 for α-Fe2O3 vs. LFO:Cr, which increased by 0.0006 mA cm−2 from α-Fe2O3 vs. LFO tandem cell in 0.1 M KOH electrolyte. As a result, the solar-to-hydrogen (STH) efficiency of 0.0026% was achieved under AM 1.5 G illumination. Graphical Abstract: (Figure presented.) © The Author(s), under exclusive licence to The Materials Research Society 2023.
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