3 years ago
Structure-engineered electrocatalyst enables highly active and stable oxygen evolution reaction over layered perovskite LaSr3Co1.5Fe1.5O10-δ

To accelerate the kinetics of oxygen evolution reaction (OER) on H2 O 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. LaSr3 Co1.5 Fe1.5 O10-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 IrO2 and the most active Ba0.5 Sr0.5 Co0.8 Fe0.2 O3-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 LaSr3 Co1.5 Fe1.5 O10-δ , an appropriate possible structure-dependent position of O p -band centre to the Fermi level and an increased amount of highly oxidative oxygen species O2 2-/O- in conjunction with a strong OH- adsorption and O2 desorption abilities. These findings not only improve the electrocatalytic activities of the layered perovskite family via optimal doping but also highlight the potential application of LaSr3 Co1.5 Fe1.5 O10-δ as an earth-abundant, cost-effective, highly active and durable electrocatalyst for OER in energy conversion and storage technologies.
Publisher URL: www.sciencedirect.com/science
DOI: S2211285517304767
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