有序化析氧电极的制备与性能

Preparation and performance of ordered oxygen evolution electrode

作为质子交换膜(PEM)电解水制氢技术的核心部件,析氧电极决定了水电解池的能耗、效率和使用寿命。采用阳极极化法制备TiO_(x)纳米管阵列(A-Ti),再通过热解法负载IrO_(2)获得有序化析氧电极(IrO_(2)/A-Ti)。在水电解池中测试评估时,IrO_(2)/A-Ti电极可实现更高的电流密度,约3.5 A/cm^(2);而未处理电极(IrO_(2)/N-Ti)在电流密度为0.8 A/cm^(2)时,即出现明显的浓差极化。IrO_(2)/A-Ti电极较好的电化学性能,可归因于电催化多活性界面的反应动力学更快,活性组分的分散性更好。

As the core component of proton exchange membrane(PEM)water electrolysis hydrogen production technique,the oxygen evolution electrode determined the energy consumption,efficiency and service life of the water electrolysis cell.TiO_(x) nanotube arrays(A-Ti)were prepared by anodic polarization method,the ordered oxygen evolution electrode(IrO_(2)/A-Ti)was obtained by loading IrO_(2) by thermal decomposition.When tested and evaluated in the water electrolysis cell,the IrO_(2)/A-Ti electrodes could achieve a much higher current density of around 3.5 A/cm^(2),while the untreated electrode(IrO_(2)/N-Ti)showed obvious concentration polarization when the current density was 0.8 A/cm^(2).The well electrochemical performance of IrO_(2)/A-Ti electrode could be attributed to the catalytic multi-interfaces with a faster reaction kinetics and better dispersion of the active components.