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PtCo bimetallic overlayers supported on bare and graphene covered ZnO(0001) substrates have been successfully prepared and used to investigate the effect of graphene interlayer on the arrangement and the redox behaviour of PtCo. We found that Co is readily oxidized at the PtCo/ZnO interface during annealing in ultra-high vacuum (UHV) and low pressure O2 atmosphere, while after inserting a layer of...