期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 12, 期 3, 页码 362-366出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2009.12.035
关键词
Co-B alloy electrode; 8-hydroxyquinoline; Cycle life; Elevated temperature; Protective layer
资金
- Young Teacher Training Plan of Guangdong Universities
- Science & Technology Project of Guangdong Province [2008A010700005]
The effect 8-hydroxyquinoline (8-HQ) additive in electrolyte on the cyclic stability of Co-B alloy electrode was investigated at elevated temperature (55 degrees C). Charge-discharge measurements show that 8-HQ can drastically enhance the cycle life of Co-B alloy electrode. Specifically, in the electrolyte containing 0.028 M 8-HQ additive, the discharge capacity of Co-B alloy electrode after 100 cycles are still up to 385.8 mAh/g at 55 degrees C. However, for the electrode in 8-HQ-free electrolyte, its discharge capacity is sharply decreased to only 138.5 mAh/g after 100 cycles. ICP-OES, XRD and ATR/FT-IR measurements were used to clarify the reason of the improvement in the cyclic stability. These results show that beneficial effect of 8-HQ on cycle life of Co-B alloy electrode can be attributed to the formation of insoluble complex (8-HQ)(2)Co(II)center dot 2H(2)O protective layer that can suppress the dissolution of Co(OH)(2) into electrolyte at elevated temperature. (C) 2009 Elsevier B.V. All rights reserved.
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