Then 50 mL KI/Bi (NO3)3 solution was taken, 0.3623 g (65.7 mM) p-benzoquinone was added, stirred again for 20 min, and filtered with an aqueous filter membrane (0.2 μm) and a needle tube. BiOI thin films were prepared in a three- electrode system of saturated calomel, Pt electrode...