A simple method to prepare a dendritic Pt-shell coating on concave Pd nanoparticles (NPs) was successfully developed. In this study, tuning the Pt precursor concentration in the reaction mixture allowed control over the length of the outer Pt dendrites, enclosed by (211) high-index facets or (110) facets were performed. The concave Pd NPs covered by short Pt dendrites (Pd/S-Pt) and long Pt dendrites (Pd/L-Pt) were applied as catalysts for the oxygen reduction reaction (ORR) in 0.1 M HClO4 electrolyte solution. Pd/S-Pt with (211) facets had higher specific activity (0.106 mA cm(-2)) than that of Pd/L-Pt with (110) facets (0.066 mA cm(-2)) or commercial Pt/C (0.076 mA cm(-2)). Additionally, the accelerated durability test (ADT) results revealed that the decay for the ORR kinetic current catalysed by Pd/S-Pt was 28.21%, which was smaller than that of Pt/C (58.15%). Thus, Pd/S-Pt was effective for catalysis of the ORR. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.