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(a) Calculated adhesion energies of pristine graphene, graphitic N-doped graphene, and pyridinic N-doped graphene. Hydrogen-adsorbed energy and different views of Ir cluster anchored (b) pristine graphene, (c) graphitic N-doped graphene, and (d) pyridinic N-doped graphene. Reproduced from ref (27) with permission from Elsevier Inc., Copyright 2019.
