负载量对钛基IrSiCe电极电催化性能的影响

Effect of Loading on Electrocatalytic Performance of Ti-Based IrSiCe Electrode

为探究负载量对钛基IrSiCe电极电催化性能的影响,采用热分解法在450℃制备了不同负载量的钛基IrSiCe电极。采用扫描电子显微镜表征了涂层表观形貌,采用开路电位、循环伏安曲线、析氧极化曲线及交流阻抗谱分析了其电化学性能。结果表明:合理的负载量可以增大电极的活性表面积、增加致密度,提高电极电催化活性、稳定性及使用寿命,但负载量过多或过少均会对电极性能产生不利影响;随着负载量增加,稳态开路电位持续增加,有利于表面转化反应的发生;真实的电催化效应和表观活性并不一致,当负载量为7.5 g/cm^2时,表观活性达到最高,但真实的电催化效应在10.0 g/cm^2时达到最高。

In order to investigate the effect of loading on electrocatalytic performance of electrodes,Ti-based IrSiCe electrodes with different loadings were prepared by thermal decomposition at 450℃.The apparent morphology of the coatings was characterized by SEM,and the electrochemical properties of the coatings were analyzed by open-circuit potential,cyclic voltammetry curve,oxygen evolution polarization curve and AC impedance spectroscopy.Results showed that the active surface area and density increased with the reasonable loading,and the electrocatalytic activity,stability and service life of the electrode also increased.However,too much or too little load would adversely affect the electrode performance.As the load increased,the steady-state open-circuit potential continued to increase,which was conducive to the occurrence of surface conversion reactions.However,the true electrocatalytic effect and apparent activity were inconsistent.When the loading was 7.5 g/cm^2,the apparent activity reached the highest,but the actual electrocatalytic effect reached the highest when the loading was 10.0 g/cm^2.