论文标题
在几何设计的srRUO3薄膜中增强的电催化氧的演化活性
Enhanced electrocatalytic oxygen evolution activity in geometrically designed SrRuO3 thin films
论文作者
论文摘要
为了产生可持续，清洁和高效的能源，电催化氧的演化反应代表了一个有吸引力的平台，因此近年来邀请了巨大的研究活动。但是，通过增强的电催化活性设计催化剂仍然是主要挑战之一。在这里，我们检查了在C-和R-Plane Sapphire底物上生长的电催化相关的金属srRUO3 perovskite的几何设计（有和没有逐步纹理的形态）的氧气进化反应活性。与均匀表面相比，在C平面蓝宝石上，具有活性RU的逐步纹理膜在电势（25 mV）中显示出显着降低。有趣的是，除选择性晶体方面的极性表面终止外，该行为与R平面案例相反，突出了活动位点的重要性。密度功能理论计算证实了OER中主动位点依赖性增强的有利能量反应途径。我们的策略可能会为设计各种氧化物薄膜的表面铺平道路，以用于高性能转换设备。
For generation of sustainable, clean and highly efficient energy, the electrocatalytic oxygen evolution reaction represents an attractive platform, thus inviting immense research activities in recent years. However, designing the catalyst with enhanced electrocatalytic activity remains one of the major challenges. Here, we examined the oxygen evolution reaction activities of geometrically designed (with and without step-textured morphology) thin films of an electrocatalytically active correlated metallic SrRuO3 perovskite grown on c- and r-plane sapphire substrates. On c-plane sapphire, as compared to the uniform surface, the step-textured films endowed with active Ru-sites show remarkable decrease in the overpotential (25 mV). Interestingly, the behavior is opposite for the r-plane case, highlighting the significance of the active sites, in addition with the polar surface termination of selective crystal facets. Density functional theory calculation confirms the favorable energy reaction pathway for the active site dependent enhancement in OER. Our strategy might pave the way towards designing the surfaces of various oxide thin films for high performance energy conversion based devices.
