3Co 1.5Fe 1.5O 10-δ]]>

摘要

AbstractTo accelerate the kinetics of oxygen evolution reaction (OER) on H2O oxidation regarding the energy conversion and storage approaches, the discovery and design of desirable cost-effective and highly efficient electrocatalysts is of prime importance. This study demonstrates a novel layered perovskite via Co-doping strategy, i.e. LaSr3Co1.5Fe1.5O10-δ, which possesses significantly higher electrocatalytic activity, considerably lower overpotential and Tafel slope, remarkably higher mass activity (MA) and specific activity (SA) together with a better long-term stability than the undoped parent perovskite, the state-of-the-art IrO2and the most active Ba0.5Sr0.5Co0.8Fe0.2O3-δ(BSCF) under harsh OER cycling conditions in alkaline solution. These merits mainly originate from the presence of partial oxidation of surface Co3+to Co4+in LaSr3Co1.5Fe1.5O10-δ, an appropriate possible structure-dependent position of Op-band centre to the Fermi level and an increased amount of highly oxidative oxygen species O22-/O-in conjunction with a strong OH-adsorption and O2des