Catalytic electro-oxidation of hydrazine on phthalocyanines deposited on graphite electrodes

✍ Scribed by José Zagal; Eva Muñoz; Soledad Ureta-Zañartu

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 458 KB
• Volume: 27
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(82)80026-1

✦ Synopsis

The catalytic properties of phthalocyanines of Fe, Co, Ni and Cu for the eleetro-oxidation of hydrazine have been examined. The metal chelates were deposited on ordinary pyrolytic graphite electrodes and their redox properties were studied by cyclic voltammetry. The catalytic activity was found to decrease as follows: FePc > CoPc > CuPc -NiPc z-graphite. The kinetics of the process with Fe-Pcand CC-PC were examined. Tafel slopes of 40 mV for Fe-PC, and of 60 mV for CO-PC were obtained. The chemical order in NIH, is 1 for both complexes. The order in OH-is 2 for Fe-PC and 1 for C-PC. With Fe-PC, the transfer of a second electron seems to bc rate determining. With CO-PC, a slow chemical step preceded by a fast one-electron transfer seems to operate.