以导电玻璃为阴极,在不同pH下,从含有0.083 mol/LCu(CH3COO)2·H2O、0.22 mol/L乳酸的电解液中电沉积合成Cu2O薄膜.研究了电解液pH对Cu2O薄膜晶体择优取向和形貌的影响.结果表明,通过调节电解液pH可合成不同择优取向和形貌的Cu2O薄膜,在pH为7～13内合成的Cu2O薄膜均具有较好的光吸收性.pH=11时,可制得具有(111)取向、结合力强、光催化活性高和稳定性好的Cu2O薄膜.Cu2O薄膜的晶面类型对薄膜催化能力有较大影响,(111)择优取向的Cu2O薄膜的光催化活性最高,反应2.5 h后罗丹明B的降解率可达63％.
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