Hardy Shuwanto, Hairus Abdullah, Young Ku, Jenni Lie
A defective system of V-doped Fe2O3 with Pt as a cocatalyst was employed for photoelectrochemical (PEC) water oxidation. The contained defects in VFPt-2.5 photoanode were revealed by XPS and EPR analyses. Interestingly, the morphology of electrodeposited V-doped α-Fe2O3 is observed to be nanosized with an average diameter size of ∼12 nm and thickness of 300 nm by SEM and TEM analyses. Under light irradiation, VFPt-2.5 photoanode achieved a remarkable onset potential of 0.22 VRHE and a photocurrent density of 2.5 mA/cm2 with an applied external bias at 1.23 VRHE in 1 M KOH electrolyte solution (pH = 14). The calculated IPCE and ABPE values of VFPt-2.5 were ∼37% and 0.85%, respectively. The generated oxygen and hydrogen by VFPt-2.5//Pt were found to be 82 and 170 μmol. The stability of VFPt-2.5 reached 95.2% revealing that Pt could help to overcome the reversed effect of surface states that cause the charge recombination. © 2023 Elsevier B.V.
Department of Materials Science and Engineering, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Road, Taipei, 10607, Taiwan; Department of Industrial Engineering, Universitas Prima Indonesia, Medan, Indonesia; Department of Chemical Engineering, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Road, Taipei, 10607, Taiwan; Department of Chemical Engineering, Widya Mandala Catholic University, Surabaya, Indonesia