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The durability of the thermally decomposed IrO_2-Ta_2O_5 coated titanium anode in a sulfate solution

机译:热分解的IrO_2-Ta_2O_5涂层钛阳极在硫酸盐溶液中的耐久性

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In this work, series of IrO2-Ta2O5 anodes were investigated. The catalytic activity towards oxygen evolution reaction (OER) of these anodes are determined by calcination temperature, coating loading (coating thickness), pretreatment of titanium substrate and coating method. The difference in OER performance among the anodes are ascribed to the crystallinity of the IrO2 phase and the phase composition of the coatings. The durability of the anodes were also studied by conducting an accelerated lifetime test (ALT) in acidic 0.9 mol L-1 Na2SO4 solution at a current density of 5 kA m(-1). An anode prepared at a moderate temperature exhibits an excellent lifetime of almost one year although its catalytic activity is not the best. Nevertheless, using the electrostatic spraying method to replace the hand-brush method in the coating preparation can prolong the service life even further and with less amount of coating loading. Moreover, it reveals that the coating loss or combined with titanium substrate passivation results in the eventual deactivation of the anodes during ALT. No critical value of the amount of the residual iridium was found in this work to predict the eventual deactivation before forming the passive oxide film. In addition, the deactivation of the anodes strongly depends on the calcination temperature.
机译:在这项工作中,研究了一系列IrO2-Ta2O5阳极。这些阳极对阳极析氧反应(OER)的催化活性取决于煅烧温度,涂层负载(涂层厚度),钛基材的预处理和涂层方法。阳极之间的OER性能差异归因于IrO2相的结晶度和涂层的相组成。还通过在5 kA m(-1)的电流密度下在酸性0.9 mol L-1 Na2SO4溶液中进行加速寿命试验(ALT)来研究阳极的耐久性。尽管催化活性不是最好的,但在中等温度下制备的阳极具有近一年的优异寿命。然而,在涂料制备中使用静电喷涂方法代替手刷方法可以进一步延长使用寿命,并减少涂料用量。此外,它表明涂层损失或与钛基底钝化相结合会导致ALT期间阳极最终失活。在这项工作中未发现残留铱量的临界值,以预测在形成钝化氧化膜之前的最终失活。另外,阳极的失活很大程度上取决于煅烧温度。

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