Abstract

Electrochemical synthesis method was developed to produce promising semiconductor thin films CuBi2O4 for use in solar water splitting. This method includes electrodepositing Cu-Bi thin films with a Cu:Bi ratio of 1:2 from acid solutions, and thermally oxidizing them to CuBi2O4 at 600 °C in air. Also Ag-doped CuBi2O4 samples were prepared by adding Ag ions in the electrolyte and co-electrodeposition in one step. Deposited films were studied by method PEC in 0.1 M Na2SO4 and 0.1 M NaOH, under modulated illumination with a wave length of 465 nm in the “light off/light on” mode. The hole concentration increased in the Ag-doped CuBi2O4 because Ag+ ions substitutionally replaced Bi3+ ions. As a result, photocurrent increased in 4 time. The synthesis of a complex compound with increased quantum efficiency allows to develop the manufacture of such Ag-doped CuBi2O4 thin films electrodes.

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