In:
ECS Transactions, The Electrochemical Society, Vol. 45, No. 29 ( 2013-04-02), p. 105-112
Abstract:
Spinel NixCo2-xO4 powder was prepared through a sol-gel method and characterized by X-ray diffraction (XRD). The electrocatalytic properties of NixCo2-xO4/C composites towards the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) were studied using rotating ring-disk electrode (RDE) technique and Koutecky-Levich theory in 1 M, 3M, and 6 M KOH electrolytes. The results show that the synthesized spinel NixCo2-xO4 exhibits activities for both ORR and OER. The OER Tafel slope is around 60mVdec-1 at a low overpotential, and the ORR process is dominated by a 4-electron transfer pathway. Cell test demonstrates that the ORR activity of non-carbon NixCo2-xO4 air electrode reached 56mA cm-2 at a potential of 0.9V and the OER activity reached 62mA cm-2 at a potential of 2.2V for the first cycle However, the ORR cycling property is not satisfying due to flooding issues. This can probably be solved by an advanced air electrode design.
Type of Medium:
Online Resource
ISSN:
1938-5862
,
1938-6737
DOI:
10.1149/04529.0105ecst
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2013
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