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Concave Pt/graphene was synthesized with the following step.H2PtCl6 (0.01M,4.8ml), Poly(N-vinyl-2-pyrrolidone) (PVP, K30,300mg), methylamine solution (30%, 0.5ml) and 25mg graphene oxide were mixed together with 20ml N, N-dimethylformamide (DMF).The obtained yellow solution was transfered to a Teflon-lined stainless-steel autoclave with a capacity of 50ml.