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Bifunctional electrocatalysts of lanthanum, 2020-3-1 · 1. Introduction. Bifunctional electrocatalysts that show activity in both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are essential for the direct conversion between electrical energy and chemicals in the practical application of reversible fuel cells and rechargeable metal-air batteries [].The four-electron reaction of oxygen in an alkaline medium is shown in ...The twelfth day of war: The killing of Samshaptakas ..., 2020-4-26 · The twelfth day of war: The killing of Samshaptakas. Contents