The Origin of Superior Performance of Co(OH)2 in Hybrid Supercapacitors

Hongcai Gao; Sen Xin; John B. Goodenough

doi:10.1016/j.chempr.2017.06.008

The Origin of Superior Performance of Co(OH)₂ in Hybrid Supercapacitors

Hongcai Gao, Sen Xin, John B. Goodenough^*

^*Corresponding author for this work

University of Texas at Austin

Research output: Contribution to journal › Short survey › peer-review

46 Citations (Scopus)

Abstract

On the basis of a recent report by Deng et al. in Nature Communications, we have identified the origin of the quite different behaviors of isostructural Ni(OH)₂ and Co(OH)₂ as electrodes of a hybrid supercapacitor to be a different orientation of the crystal c axis in relation to the short dimension of platelet particles. We suggest that the favorable ordering in Co(OH)₂, but not in Ni(OH)₂, could be stabilized by a 3d orbital ordering that removes an orbital degeneracy of the octahedral-site Co²⁺ ions.

Original language	English
Pages (from-to)	26-28
Number of pages	3
Journal	Chem
Volume	3
Issue number	1
DOIs	https://doi.org/10.1016/j.chempr.2017.06.008
Publication status	Published - 13 Jul 2017
Externally published	Yes

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10.1016/j.chempr.2017.06.008

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abstract = "On the basis of a recent report by Deng et al. in Nature Communications, we have identified the origin of the quite different behaviors of isostructural Ni(OH)2 and Co(OH)2 as electrodes of a hybrid supercapacitor to be a different orientation of the crystal c axis in relation to the short dimension of platelet particles. We suggest that the favorable ordering in Co(OH)2, but not in Ni(OH)2, could be stabilized by a 3d orbital ordering that removes an orbital degeneracy of the octahedral-site Co2+ ions.",

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AB - On the basis of a recent report by Deng et al. in Nature Communications, we have identified the origin of the quite different behaviors of isostructural Ni(OH)2 and Co(OH)2 as electrodes of a hybrid supercapacitor to be a different orientation of the crystal c axis in relation to the short dimension of platelet particles. We suggest that the favorable ordering in Co(OH)2, but not in Ni(OH)2, could be stabilized by a 3d orbital ordering that removes an orbital degeneracy of the octahedral-site Co2+ ions.

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The Origin of Superior Performance of Co(OH)₂ in Hybrid Supercapacitors

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