锡锑氧化物中间层对钛基阳极氧化MnO_2电极性能的影响

Effect of Tin-Antimony Oxide Intermediate Layer on the Performance of Titanium-Based Anodizing MnO_2 Electrode

将锡锑氧化物用作钛基MnO2电极的中间层可改善电极性能,目前在钛基锡锑氧化物中间层上多采用热分解法制备MnO2层制成电极,而很少采用电化学方法。为此,先在钛片上涂覆SbOX+SnO2中间层,然后在其上在MnSO4溶液中阳极氧化制备MnO2层,最终制成Ti/SbOX+SnO2/MnO2电极,通过暂态和稳态动电位极化探讨了中间层对MnO2成膜过程的影响,并利用电化学阻抗谱、极化曲线等电化学方法研究了中间层对钛基MnO2电极的催化性能和稳定性能的影响。结果表明:锡锑氧化物中间层的添加没有改变锰离子的阳极氧化机理,但提高了锰离子的氧化速度,降低了Ti基体和MnO2层之间的接触电阻,促进了MnO2与Ti基体间的电荷传递,降低了电极的析氧电位,提高了电极析氧催化性能和稳定性能。

Ti/SbOx+SnO2/MnO2 electrode was prepared by coating Ti plate with SbOx+SnO2 intermediate layer in combination with anodizing to generate MnO2 coating.Transient and static dynamic polarization methods were adopted to investigate the effect of the intermediate layer on the formation of MnO2 coating.The effect of the intermediate layer on the catalytic performance and stability of the electrode was investigated by measuring electrochemical impedance spectrum and polarization curve.It was found that the intermediate layer did not influence the anodizing mechanism of manganese ions,but accelerated the oxidation of manganese ions,reduced the resistance between Ti substrate and MnO2 coating,promoted the charge transfer between Ti substrate and MnO2 coating,and reduced the oxygen evolution potential of the electrode,resulting in improved oxygen evolution catalytic performance and stability of the electrode.