Improving the high-temperature performances of a layered double hydroxide, [Ni sub(4)Al(OH) sub(10)]NO sub(3), through calcium hydroxide coatings

In order to improve high-temperature performances, calcium hydroxide was coated onto [Ni sub(4)Al(OH) sub(10)]NO sub(3) through surface modification or mechanical blending. The existence of Ca(OH) sub(2) was revealed by XRD, and SEM which showed that there are Ca(OH) sub(2)-rich blocks in the sample...

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Bibliographic Details
Published in:Electrochimica acta 2011-01, Vol.56 (7), p.2862-2869
Main Authors: Hu, Meng, Lei, Lixu, Chen, Jinxi, Sun, Yueming
Format: Article
Language:English
Online Access:Get full text
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Summary:In order to improve high-temperature performances, calcium hydroxide was coated onto [Ni sub(4)Al(OH) sub(10)]NO sub(3) through surface modification or mechanical blending. The existence of Ca(OH) sub(2) was revealed by XRD, and SEM which showed that there are Ca(OH) sub(2)-rich blocks in the sample containing 13.0 wt% calcium prepared by surface modification. The addition of Ca(OH) sub(2) can retard the structural transformation from the layered double hydroxide [Ni sub(4)Al(OH) sub(10)]NO sub(3) to beta -Ni(OH) sub(2). In addition, it improves charge/discharge performances and electrochemical reversibility by elevating the oxygen evolution potential, increasing the double layer capacity C sub(dl) and decreasing the charge transfer resistance R sub(ct).
ISSN:0013-4686
DOI:10.1016/j.electacta.2010.12.074