This work demonstrates a method of electroplating nanostructured Pt, Ir, and Pt-Ir at room temperature. All the obtained samples have been characterized by SEM and XPS. By controlling the volume ratio of Pt to Ir electrolytes, Pt(100%)-Ir(0%), Pt(91.2%)-Ir(8.8%), Pt(81.3%)-Ir(18.7%), and Pt(12.4%)-Ir(87.6%) were formed on the surfaces. Besides, the nanostructure was formed with the help of vigorously hydrogen bubble generation. The results indicate that co-electrodeposition of nanostructured Pt-Ir films at room temperature can be achieved by manipulating the concentration of Ir electrolyte and the concentration of HCl. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.003209jes] All rights reserved.