强关联SrRuO3薄膜中通过相变增强的电催化活性
Enhanced electrocatalytic activity via phase transitions in strongly correlated SrRuO3 thin films
摘要：
过渡金属氧化物已被广泛研究并用作高效催化剂。然而，在理解这些材料的电化学活性时，往往会忽略这些材料中引起有趣的涌现现象的强相关行为。在这里，我们证明了密切的相关性之间的相变和析氧反应（OER）在一个强相关的SrRuO 3。通过在单晶SrRuO_3外延薄膜中系统地引入Ru-O空位，诱导了晶体对称性的相变，从而导致电子结构的相应改变。电子结构的改变显著地影响了其电化学活性，因此OER活性的过电位降低了30%。我们的研究表明，OER活性的大幅提高，甚至可以实现在单一的材料系统，通过合理的设计和工程的晶体和电子结构。
英文摘要：
Transition metal oxides have been extensively studied and utilized as efficient catalysts. However, the strongly correlated behavior which often results in intriguing emergent phenomena in these materials has been mostly overlooked in understanding the electrochemical activities. Here, we demonstrate a close correlation between the phase transitions and oxygen evolution reaction (OER) in a strongly correlated SrRuO3. By systematically introducing Ru-O vacancies into the single-crystalline SrRuO3 epitaxial thin films, we induced phase transition in crystalline symmetry which resulted in corresponding modification in the electronic structure. The modified electronic structure significantly affect the electrochemical activities, so a 30% decrease in the overpotential for the OER activity was achieved. Our study suggests that a substantial enhancement in the OER activity can be realized even within single material systems, by rational design and engineering of their crystal and electronic structures.
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