Oxygen and hydrogen evolution reactions on Ru, RuO2, Ir, and IrO2 thin film electrodes in acidic and alkaline electrolytes: A comparative study on activity and stability
Oxygen and hydrogen evolution reactions on Ru, RuO2, Ir, and IrO2 thin film electrodes in acidic and alkaline electrolytes: A comparative study on activity and stability
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DOI：
10.1016/j.cattod.2015.08.014
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发表时间：
2016-03-15
期刊：
影响因子：
5.3
通讯作者：
Mayrhofer, Karl J. J.
中科院分区：
文献类型：
--
作者：
Cherevko, Serhiy;Geiger, Simon;Mayrhofer, Karl J. J.
金属铱和钌以及它们的氧化物是酸性介质中最活跃的析氧（OER）电催化剂之一，并且还对析氢（HER）的催化感兴趣。然而，这些材料在不同操作条件下的稳定性仍然没有完全了解。在目前的工作中，良好定义的Ru，RuO 2，Ir和IrO 2薄膜电极的活性和稳定性进行了评估，在酸性和碱性电解质中使用的电化学扫描流动池（SFC）连接到电感耦合等离子体质谱仪（ICP-MS）。所有电极和电解质有意采用相同的实验方案，以获得关于电极固有活性和稳定性的明确和可比信息。结果表明，与电解质无关，OER活性随Ru >Ir接近RuO 2> IrO 2而降低，而溶解随IrO 2增加而增加
Metallic iridium and ruthenium as well as their oxides are among the most active oxygen evolution (OER) electrocatalysts in acidic media, and are also of interest for the catalysis of the hydrogen evolution (HER). The stability of these materials under different operating conditions is, however, still not fully understood. In the current work, activity and stability of well-defined Ru, RuO2, Ir, and IrO2 thin film electrodes are evaluated in acidic and alkaline electrolytes using an electrochemical scanning flow cell (SFC) connected to an inductively coupled plasma mass spectrometer (ICP-MS). Identical experimental protocols are intentionally employed for all electrodes and electrolytes, to obtain unambiguous and comparable information on intrinsic activity and stability of the electrodes. It is found that independent of the electrolyte, OER activity decreases as Ru >Ir approximate to RuO2 >IrO2, while dissolution increases as IrO2