中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 14 No. 4 August 2004 |
Oxygen reduction on teflon-bonded carbon electrode①
ZHOU De-bi(周德璧), HUANG Ke-long(黃可龍), ZHANG Shi-min(張世民)
（School of Chemistry and Chemical Engineering,
Central South University, Changsha 410083, China）
Abstract:Oxygen reduction on Teflon-bonded carbon gas diffusion electrode without catalyst in 6 mol/L KOH solution was investigated with acimpedance spectroscopy and other electrochemical techniques. The kinetic parameters were measured with an exchange current density ofJ0=3.44×10-9and a Tafel slope of 46 mV/dec in low overpotential range (-0.05 -0.14 V vs SCE), which are comparable with those reported on carbon supported platinum electrode. The reaction mechanism ofOR and the active effect of carbon black were examined.
Key words: oxygen reduction; gas diffusion electrode; acimpedance; chronopotentiometry
