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Soft Template‐Directed Reactions: One‐Pot Synthetic Route for Bimetallic Core–Satellite–Shell Structured Electrocatalytic Nanospheres

A one‐pot synthesis strategy, which retards nanoparticle (NP) agglomeration in the initiation of reaction and prevents the combination of the core and small species, is reported. In the present study, we synthesize bimetallic core–shell structures of single Au cores and satellites‐like Pt NPs. The core was generated by using HAuCl4; thus, providing the unique conductive ability for electrons. The entire evolution process of Pt NPs during the whole reaction was confined within the SiO2 nanospheres. Through strong electrostatic attraction, the Pt NPs in a tight H3O+ packing accordingly increased the adsorbed hydrogen (Had) rate. The comparative investigation of electrocatalytic activities of the products and commercial Pt/C‐20 % in the hydrogen evolution reaction (HER) revealed that the Au@SiO2‐Pt, with a strong metal interaction effect in the electrolyte, exhibits a low Tafel slope of 52 mV dec−1, with its catalytic activity being maintained for at least 10 h. Impressively, it also demonstrates a high turnover frequency (TOF) value of 0.11 s−1.