聚苯胺载铂钯电极的制备及氧还原催化性能研究

Preparation and Oxygen Reduction Catalytic Performance of Nichol Electrode with Platinum and Palladium Particles Loaded onto Polyaniline

利用恒电位法在Ni上直接电沉积Pt和Pd,制成Pt-Pd/Ni电极;采用循环伏安法,在Ni片电极上电聚合导电高分子聚苯胺(PANi),然后利用恒电位法在聚苯胺薄膜上制备了聚苯胺载Pt-Pd复合电极(Pt-Pd-PANi/Ni)。采用线性伏安扫描法、交流阻抗法、扫描电镜、能谱方法对电极催化剂进行测试表征,实验表明:将Pt-Pd沉积在聚苯胺上,增加了Pt-Pd颗粒的分散度,Pt-Pd的利用率得以提高,Pt-Pd晶体颗粒大小为1~5μm。在相同的Pt-Pd载量下,Pt-Pd-PANi/Ni电极比Pt-Pd/Ni电极对氧还原的催化性能更好。在Ni片上沉积聚苯胺5个周期后再沉积Pt-Pd 600s时的Pt-Pd-PANi/Ni电极对氧还原的催化效果最好。

Pt-Pd/Ni electrode was prepared by despositing Pt and Pd particles on a Ni electrode by potentiostatic method. Polyaniline was electropolymerized onto Ni by the cyclic voltammetric method, and then Pt and Pd particles were deposited on a polyaniline modified Ni electrode by potentiostatic method to make the Pt-Pd-PANi/Ni electrode. Catalytic activities of the prepared electrodes were studied by I.inear Sweep Voltammetry（LSV）, Electrochemical Impedance Spectroseopy（EIS）, SEM and EDS techniques. The results showed that both the dispersion and the efficiency of utilization in electro-catalysis of Pt and Pd particles with the size of 1 t^m to 5 b^m were improved. With the same load of Pt and Pd, Pt-Pd-PANi/Ni electrode presented better performance in oxygen electric catalytic reduction activity than that of Pt-Pd/Ni. The best performance of Pt-Pd PANi/Ni appeared when polyaniline was swept for 600 s and then deposited with 5 cycles.