Oxygen reduction electrocatalysis on some manganese oxides

✍ Scribed by K. Matsuki; H. Kamada

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 303 KB
• Volume: 31
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(86)80054-8

✦ Synopsis

Cathodic oxygen reduction on some manganese oxides in alkaline solution was examined by using a rotating ring-disk electrode (rrde) and a Teflon-bonded electrode technique . The activity of y-MnO, for cathodic oxygen reduction was larger than that of y-MnOOH at the potential below -200 mV vs Hg/HgO (rrde4 The electrochemical activity of carbon-supported y-MnOOH Teflon-bonded electrode, on the contrary, was extremely high compared with that of y-Mn0 3 . It was found that the y-MnOOH in the Teflon-bonded electrode was thermally decomposed mainly to Mn 3 04 and Mn 6 Os in the course of the electrode preparation. These facts suggest that one of the causes of the high activity of the Teflon-bonded electrode containing y-MnOOH is manganese oxides with distortion which have been produced in the electrode by the thermal decomposition of y-MnOOH .