Abstract
Dendritic platinum (Pt) nanoparticles are successfully anchored on Ketjen Black by a facile synthetic route without organic solvent. The nonionic surfactant Brij 58 is used as a mesopore-forming agent during the in-situ growth of Pt nanoparticles. The dendritic Pt nanoparticles on Ketjen Black exhibit highly efficient electrocatalytic activity for the oxygen reduction reaction. The electrocatalytic activity can be further improved by increasing the Pt loading amount on Ketjen Black. Upon increasing to 31.4 wt% Pt, the half-wave potential and limited-diffusion current density reach 0.887 V and 6.22 mA cm−2, respectively. The as-prepared catalyst shows an ideal four-electron pathway of O2 reduction to H2O and a low H2O2 yield of less than 1% in the potential window of 0.2–0.8 V. Moreover, the catalyst exhibits remarkable long-term durability with the same limiting current density and only a 10.5 mV negative shift in the half-wave potential after 5000 cycles.
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•Dendritic platinum nanoparticles are successfully anchored on Ketjen Black.•The synthetic method is facile, cost-effective, and organic solvent-free.•The Pt loading amount on electrocatalytic activity has been optimized.•The catalyst exhibits efficient electrocatalytic activity with a good durability.