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Theoretical calculations for hydrogen adsorption on Ir and IrNC. (a,b) The variation in electron density on the surface of Ir and IrNC in relation to H adsorption. (c) Density of states (DOS) of the surface-adsorbed H on the Ir sites of IrNC. (d) Free energy diagram of Ir and IrNC. Reproduced with permission from ref (25). Copyright 2019 Nature Publishing Group.
