The reduction of dioxygen at polypyrrole-modified electrodes with incorporated Pt particles

✍ Scribed by F.T.A. Vork; E. Barendrecht

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 475 KB
• Volume: 35
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(90)85050-w

✦ Synopsis

The electrodeposltlon of Pt particles m a polypyrrole layer leads to electrodes, showmg electrocatalytlc actlvlty for the reduction of dloxygen m aqueous media The electrode preparation, with the current density and time of deposltlon as main parameters, mfluences the final product composltlon, le the ratlo ofwater to hydrogen peroxide, as dloxygen can be reduced to water or hydrogen peroxlde, respectively, vta a four-or a two-electron mechanism By usmg the rotatmg nng-disc techmque the amount of hydrogen peroxlde m the reactlon product can be detected When Pt particles are deposIted with a high current density, mamly water IS produced At low current densltles of Pt deposltlon, hydrogen peroxide IS the mam product These effects are explamed m terms of the avadabdlty of the Pt surface for dloxygen