| 초록 |
Quest for a stable and enhance photoanode material for photoelectrochemical water splitting is always a challenging issue. Addressing to this fact in this report, successive ionic layer adsorption and reaction (SILAR) method have been employed to coat ZnFe2O4 nanoparticles over BiVO4 photoanodes. The structural, morphological, optical and Raman analysis shows the confirmation of the anchored ZnFe2O4 nanoparticles over BiVO4 with different SILAR cycles. The optimized SILAR cycles to form suitable BiVO4/ZnFe2O4 heterojunction shows outstanding steady photocurrent of 1.434 mA/cm2 at 1 V versus saturated calomel electrode in a neutral Na2SO4 electrolyte under 1 Sun illumination of simulated solar light. Significant increase in the photocurrent density of about two times with respect to bare BiVO4 nanostructured thin film have been registered. Along with this the optimized BiVO4/ZnFe2O4 also shows remarkable stability of for continuous 2 h exposure. Apart from this the Mott-Schottky and impedance analysis also confirms the superiority of the optimized BiVO4/ZnFe2O4 rather than bare BiVO4 through flat band potential, charge separation and transport ability. Conclusively this tactic of materializing SILAR process to coat metal oxides, may open new opportunities for fabrication of stable and enhanced photoanodes for photoelectrochemical water splitting. |
