Abstract
Herein, we reported the direct synthesis of core-shell AuPt@Pt nanocrystals supported on reduced graphene oxide (AuPt@Pt NCs/rGO) in aqueous media, with poly(1-vinyl-3-ethylimidazolium bromide) (poly(ViEtlmBr)) as a structure-directing agent, without any specific additive (e.g., seed, organic solvent or template). The as-synthesized AuPt@Pt NCs/rGO exhibited improved electrocatalytic performances towards ethylene glycol oxidation reaction (EGOR) in contrast with commercial Pt/C (20%) catalyst in acidic and alkaline electrolytes. Meanwhile, the catalyst displayed enhanced catalytic activity for hydrogen evolution reaction (HER) with the positive onset potential (−25mV) and a small Tafel slope (33mVdecade−1) relative to Pt/C catalyst (−18mV, 31mVdecade−1) in 0.5M H2SO4, along with the positive onset potential (−43mV) and a small Tafel slope (73mVdecade−1) as compared with Pt/C catalyst (−42mV, 85mVdecade−1) in 0.5M KOH.
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