Abstract
Herein, reduced graphene oxide supported core–shell Pt@Pd nanoflowers (Pt@Pd NFs/rGO) were fabricated by a single-step, seedless wet-chemical approach at room temperature, only using 3-aminopyrrolidine dihydrochloride (APDC) as the weak stabilizer and structure director. The morphology, structure, and composition of the product were characterized by a series of characterization techniques, and the formation mechanism was discussed in detail. The nanocomposite exhibited improved catalytic activity for oxygen reduction reaction (ORR) with the positive onset potential (Eonset, 0.91 V vs. RHE) and half-wave potential (E1/2, 0.82 V vs. RHE), and hydrogen evolution reaction (HER) with the low Eonset (−39 mV vs. RHE), overpotential (56 mV vs. RHE) at the fixed current density of 10 mA cm–2, and small Tafel slope (39 mV dec–1). This is ascribed to the synergistic effects of the bimetals, rGO as the good support, and electronic coupling between the Pd shell and the Pt core.
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