Surface Passivation of Hematite Photoanodes Using Iron Phosphate
New journal of chemistry(2023)
Abstract
Deposition of passive layers containing covalently bonded oxygen is an effective strategy to suppress the surface states of & alpha;-Fe2O3 (hematite). In this research, hematite films were first grown using the electric field assisted liquid phase deposition (EA-LPD). The deposited films were then heat-treated at 800 & DEG;C for 20 minutes. Thin layers of iron phosphate (FePO4 & BULL;2H(2)O) in both crystalline and amorphous forms were deposited on the films using the liquid phase deposition (LPD). Photoelectrochemical (PEC) studies indicated that the hematite films modified with an FePO4 & BULL;2H(2)O surface passivation layer show higher photocurrent density than pristine hematite. The highest photocurrent density, & SIM;0.71 mA cm(-2), was obtained at 1.23 V vs. reversible hydrogen electrode (RHE) for the hematite films modified with amorphous FePO4 & BULL;2H(2)O, & SIM;36% more than pristine hematite. Under solar radiation, FePO4 & BULL;2H(2)O facilitates the oxygen evolution reaction (OER) by reducing the onset potential from & SIM;0.82 V vs. RHE for pristine hematite to 0.74 V vs. RHE for the hematite modified with FePO4 & BULL;2H(2)O layer.
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