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Intermetallic compounds MPt (M = Al, Ga, In, Sn) in the oxygen evolution reaction

Pt-based intermetallic compounds M 2 Pt with anti -CaF 2 type of crystal structure and counterpart elements (M) from groups 13 (Al, Ga, In) and 14 (Sn) were studied as electrocatalysts for the oxygen evolution reaction (OER) in acidic media. Polar covalent bonding M-Pt with substantial charge transf...

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Published in:Sustainable energy & fuels 2021-11, Vol.5 (22), p.5762-5772
Main Authors: Barrios Jiménez, Ana María, Ormeci, Alim, Burkhardt, Ulrich, Altendorf, Simone G, Kaiser, Felix, Veremchuk, Igor, Auffermann, Gudrun, Grin, Yuri, Antonyshyn, Iryna
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Summary:Pt-based intermetallic compounds M 2 Pt with anti -CaF 2 type of crystal structure and counterpart elements (M) from groups 13 (Al, Ga, In) and 14 (Sn) were studied as electrocatalysts for the oxygen evolution reaction (OER) in acidic media. Polar covalent bonding M-Pt with substantial charge transfer makes the difference between M 2 Pt and elemental platinum. The compounds M 2 Pt (M = Al, Ga, In) possess enhanced OER activity compared to elemental Pt and it improves during the partial on-going leaching of the M component. Therefore, the M 2 Pt compounds act as precursors for formation of OER-active M x Pt 1− x layers. The OER activity of isostructural M 2 Pt (M = Al, Ga, In, Sn) compounds is governed by the nature of counterpart element (M), its leaching rate and corresponding change of the Pt electronic state.
ISSN:2398-4902
DOI:10.1039/d1se01190a