稀土Nd掺杂Ti/RuO2-Co3O4电极电催化性能研究

采用热分解法在400℃下制备了稀土Nd改性Ti/RuO2-Co3O4氧化物阳极,对稀土Nd掺杂量进行优化。利用SEM、EDX及XRD等分析方法对电极表面形貌、组成及结构进行了表征,通过开路电压、循环伏安、极化曲线及强化电解寿命等电化学方法研究了电极的析氧催化活性及稳定性。结果表明:稀土Nd掺杂使表面层晶粒细化,晶型饱满,且促进活性组分RuO2向电极表面富集,增加电极催化活性中心;掺杂量为20:1时,电极析氧性能最佳,伏安电荷容量高达686mC/cm2,反应活化能低至16.76kJ/mol,掺入稀土Nd后电极基体与涂层的结合力增强,电极强化电解寿命高达158h。

Electrocatalytic Activity of Titanium Based Nd-doped RuO2-Co3O4 Electrodes for Oxygen Evolution

Ti-supported Nd-doped RuO2-Co3O4 electrodes were prepared by thermal decomposition at 400 oC. The parameters of Nd-doping content were optimized. The morphology, the composition and the structure of the coating anode were characterized by SEM, EDX, and XRD. The electrocatalytic activity for oxygen evolution and the stability of the electrodes were studied by open-potential, cyclic voltammetry, polarization curve and damaged checking. The results show that Nb doping can lead to fine grains of surfaces and full crystals, promote RuO2 enrichment, and increase the active sites. Catalytic performance of the mixed oxide electrodes containing 20:1 Nd-doping content is the best, with the greatest voltammetric charge, 686 mC·cm-2, and the lowest apparent activation energy for oxygen evolution, 16.76 kJ/mol. The increase of binding force between the electrode substrate and the coating contribute to a longer electrode life than the blank electrode, reaching to 158 h.