SiO2含量对Ti/IrO2-Ta2O5-SiO2析氧阳极的电催化活性及稳定性的影响

摘要

以钛板为基体,通过热分解H2IrCl6,TaCl5和H2SiO3的混合涂液制备了Ti/IrO2-Ta2O5-SiO2阳极,研究了SiO2含量对Ti/IrO2-Ta2O5-SiO2阳极电催化活性及稳定性的影响.结果表明:掺杂SiO2后Ti/IrO2-Ta2O5-SiO2阳极电催化活性降低;适量SiO2可以提高Ti/IrO2-Ta2O5-SiO2阳极稳定性.当涂液中Si的摩尔分数为5%时,Ti/IrO2-Ta2O5-SiO2阳极的稳定性最好;当Si的摩尔分数达到20%时,其稳定性低于未掺SiO2的电极的稳定性.%A Ti/IrO2-Ta2O5-SiO2 anode was prepared by thermal decomposition with a mixed solution of H2IrCl6, TaCl5 and H2SiO3 on titanium sheet. The effects of SiO2 content on electrocatalytic activity and stability of the Ti/IrO2-Ta2O5-SiO2 anode were studied. The results showed that the electrocatalytic activity of Ti/IrO2-Ta2O5-SiO2 anode is decreased after SiO2 addition and its stability is improved with a proper dosage of SiO2. The stability of Ti/IrO2-Ta2O5-SiO2 anode is the best when the molar fraction of Si in coating bath is 5％, but it is inferior to that of Ti/IrO2-Ta2O5 anode when the molar fraction of Si reaches 20％.