| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5432137 | Carbon | 2017 | 8 Pages |
In this work, several commercially available carbon black and graphitized carbon materials were first tested with respect to their thermal and electrochemical stability by thermogravimetric analysis and accelerated degradation test in 7Â M KOH, respectively. KS6L and C65 were the most stable systems. Because of its more than threefold higher specific volume, carbon black C65 was selected as additive for gas diffusion electrode fabrication in order to increase poor electronic conductivity of as-prepared La0.6Ca0.4CoO3 (LCC) and Ba0.5Sr0.5Co0.8Fe0.2O3 (BSCF) bifunctional perovskite catalysts. Especially BSCF-based gas diffusion electrode exhibited outstanding stability over 3600Â h during OER/ORR cycling at 10Â mAÂ cmâ2 for 2.5Â h each. This was attributed to optimal catalyst/carbon interaction and their exceptional corrosion stability in highly concentrated alkaline solution. Surprisingly, BSCF/C65 showed higher activity not only for OER and but also for ORR reaction compared to that of LCC/C65.
Graphical abstractDownload high-res image (164KB)Download full-size image
