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Potassium-Substituted LaMnO<inf>3</inf>as a Highly Active and Exceptionally Stable Electrocatalyst toward Bifunctional Oxygen Reduction and Oxygen Evolution Reactions
Journal
ACS Applied Energy Materials
Date Issued
2022-06-27
Author(s)
Kotha, Vishal
Karajagi, Imran
Ghosh, Prakash C.
Panchakarla, Leela S.
Abstract
Efficient, low-cost, and long-lasting electrocatalysts that accelerate sluggish oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) kinetics are highly desirable for a variety of applications, including metal-air batteries and fuel cells, but they are uncommon. Such bifunctional catalysts are primarily harmed by either low catalytic activity or degradation during prolonged cycling. We devise a relatively low-temperature hydrothermal strategy for producing a perovskite oxide-based catalyst composed of potassium-substituted LaMnO3. In an alkaline environment, the catalyst performs admirably, with improved kinetics and activity for the ORR (half-wave potential of 0.78 V) and OER (potential at the current density of 10 mA cm-2 is 1.66 V). Furthermore, as a two-electrode cell, this catalyst renders the potential for use as an electrode in zinc-air batteries with unprecedented stability (no visible sign of degradation even after 1000 cycles of charge-discharge).
Volume
5
Subjects