Au and Pd nanoparticles were individually or together electrodeposited on top of polymerized cobalt tetraaminophthalocyanine (poly-CoTAPc). When Pd and Au nanoparticles are co-deposited together, the electrode is denoted as Au-Pd (co-deposited)/poly-CoTAPc-GCE. X-ray photoelectron spectroscopy (XPS) was used to show the successful deposition of AuNPs, PdNPs and Au-Pd (co-deposited). The scanning electrochemical microscopy showed that Au-Pd (co-deposited)/poly-CoTAPc-GCE (with current range of 9.5-13.5 mu A) was more conducting than Au-Pd (co-deposited)-GCE (with current range of 8-12 mu A). Electrochemical impedance spectroscopy (EIS) showed that there was less resistance to charge transfer for Au-Pd (co-deposited)/poly-CoTAPc-GCE compared to the rest of the electrodes. Au-Pd (co-deposited)/poly-CoTAPc-GCE showed the best activity for the electrooxidation of hydrazine in terms of limit of detection (0.5 mu M), hence shows promise as an electrocatalyst for electrooxidation of hydrazine. (C) 2014 Elsevier Inc. All rights reserved.