Enhanced electrocatalytic activity via phase transitions in strongly correlated SrRuO3 thin films

Abstract

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.

31 pages, 18 figures, 2 tables

References in corpus (1)

• Structural, electronic and magnetic properties of SrRuO${}_3$ under epitaxial strain

Cited by in corpus (4)

• Propagation control of octahedral tilt in SrRuO3 via artificial heterostructuring
• Tuning electromagnetic properties of SrRuO3 epitaxial thin films via atomic control of cation vacancies
• Ex-situ atomic force microscopy on the growth mode of SrRuO3 epitaxial thin film
• Enhanced electrocatalytic oxygen evolution activity in geometrically designed SrRuO3 thin films