Abstract
Important catalytic reactions for aqueous fuel cells, for example hydrogen and oxygen reduction and evolution, and oxidation of alternative fuels for fuel cells like hydrogen, methanol, ethanol, and formic acid are given in some detail. Although the platinum group of metals are the best catalysts for all reactions as DFT calculations predict, their activity is still relatively low. At the anode side of fuel cells, methanol and formic acid on Pt oxidize at high positive potentials beyond technological interest, and addition of second component that lowers the oxidation onset by supplying oxygen-containing species is needed. Complex kinetics of ethanol oxidation requires additional components to break the C–C bond. On the cathode side, major losses in overall cell voltage come from the complex kinetics of oxygen reduction and its low activity. Early attempts to increase the activity of Pt-based catalysts were mostly concentrated on decreasing the particle size to increase the surface to volume ratio of noble metals and alloying with other metals.
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Adzic, R., Marinkovic, N. (2020). Important Electrocatalytic Reactions. In: Platinum Monolayer Electrocatalysts . Springer, Cham. https://doi.org/10.1007/978-3-030-49566-4_6
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