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(a) A nano-ZrB2 wedged RGO composite as a support of Pt nanoparticles with enhanced catalytic activity towards the oxygen reduction, (b) Raman spectra, (c) (d) XRD spectra of RGO, RGO/ZrB2, ZrB2 and Pt/RGO, Pt/RGO-ZrB2, (e) nitrogen adsorption-desorption isotherms of RGO and RGO/ZrB2.
