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Carbon black supported ultra-high loading silver nanoparticle catalyst and its enhanced electrocatalytic activity towards oxygen reduction reaction in alkaline medium.
- Source :
-
Journal of Electroanalytical Chemistry . May2013, Vol. 696, p9-14. 6p. - Publication Year :
- 2013
-
Abstract
- Abstract: Carbon black supported ultra-high loading silver nanoparticle catalyst (Ag/C) was prepared by a modified ethylene glycol reduction method. The thermogravimetry analysis showed that the Ag mass loading of this catalyst reached up to 392wt.%. The X-ray diffraction and scanning electron microscopy characterizations showed that the Ag nanoparticles were ca. 10nm diameter of fine spheres with a face-centered cubic crystal structure, and were densely stacked but not aggregated on the carbon black surface in spite of such ultra-high loading and small size. The chronoamperometry and polarization studies utilizing rotating disk electrode (RDE) or rotating ring disk electrode (RRDE) revealed that this ultra-high loading 392wt.% Ag/C catalyst exhibited higher electrocatalytic activity for oxygen reduction reaction (ORR) in alkaline medium. The ORR proceeded a four-electron process when compared with the low loading 40wt.% Ag/C catalyst. Furthermore, the chronopotentiometry test on gas-diffusion electrode containing the 392wt.% Ag/C catalyst implied that this catalyst had a considerably stable ORR activity for application in brine electrolysis. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 15726657
- Volume :
- 696
- Database :
- Academic Search Index
- Journal :
- Journal of Electroanalytical Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 89206925
- Full Text :
- https://doi.org/10.1016/j.jelechem.2013.02.018