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Preparation of reduced tantalum pentoxide by electrochemical technique for oxygen reduction reaction.
- Source :
-
Journal of Power Sources . Dec2014, Vol. 268, p728-732. 5p. - Publication Year :
- 2014
-
Abstract
- A non-Pt based electrocatalyst, tantalum oxide (TaOx) deposited on glassy carbon, for oxygen reduction reaction (ORR) in acidic solutions was prepared by electrochemical technique. The tantalum pentoxide (Ta2O5) formed on the as-prepared deposits was electrochemically reduced to generate its reduced species which conventionally need a heat treatment under H2 atmosphere. The reduced Ta2O5 shows a fairly high onset potential of ORR (0.87 V vs. RHE) in comparison with that (0.98 V) at a commercially available Pt/C catalyst. The ORR performance of the TaOx was investigated using a rotating ring-disk electrode voltammetry showing that a four-electron ORR takes place actually at potential above ca. 0.8 V and a two-electron ORR becomes significant gradually as the potential is increased negatively. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03787753
- Volume :
- 268
- Database :
- Academic Search Index
- Journal :
- Journal of Power Sources
- Publication Type :
- Academic Journal
- Accession number :
- 97262003
- Full Text :
- https://doi.org/10.1016/j.jpowsour.2014.06.102