Effects of carbon pretreatment for oxygen reduction in alkaline electrolyte

被引:27
作者
Pirjamali, M [1 ]
Kiros, Y [1 ]
机构
[1] Royal Inst Technol, KTH, Dept Chem Engn & Technol, S-10044 Stockholm, Sweden
关键词
carbon pretreatment; alkaline electrolyte; gas diffusion electrodes; physical and surface characterisation; activity; stability;
D O I
10.1016/S0378-7753(02)00219-7
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The effects of different media on carbon pretreatments for oxygen reduction in alkaline electrolyte without application of active electrocatalysts were examined. Low surface area Vulcan XC-72 and high surface area Ketjenblack EC-300 were subjected to aqueous acid (flouric or formic), gaseous (H-2, N-2 or CO2) and thermal treatments at 600 or 900 degreesC. Though non-scrubbed air was used, as a result of which carbonate build-up was high and peroxide concentration increased due to the electrode reaction, some of the electrodes resulted in life-tests of more than 2000 h at 65 degreesC, 6 M KOH with a constant load of 50 mA cm(-2) and intermittent polarisations at higher current densities. BET-surface areas and pH changes of more than 60% and weight losses of up to 15% of the carbon blacks were observed after the pretreatment steps. Electrochemical characterisation of the carbons showed that pretreatment steps of the carbon blacks have a significant effect on the long-term stability and activity of the gas diffusion electrodes in alkaline electrolyte. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:446 / 451
页数:6
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