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Title: Achieving high rate performance in layered hydroxide supercapacitor electrodes
Authors: Wang, Xu
Yan, Chaoyi
Sumboja, Afriyanti
Yan, Jian
Lee, Pooi See
Keywords: DRNTU::Engineering::Materials::Energy materials
Issue Date: 2013
Source: Wang, X., Yan, C., Sumboja, A., Yan, J., & Lee, P. S. (2013). Achieving High Rate Performance in Layered Hydroxide Supercapacitor Electrodes. Advanced Energy Materials, in press.
Series/Report no.: Advanced energy materials
Abstract: Layered hydroxides (LHs) are promising supercapacitor electrode materials with high specific capacitances. However, they generally exhibit poor energy storage ability at high current densities due to their insulating nature. Nickel-cobalt-aluminum LHs are synthesized and chemically treated to form LHs with enhanced conductivity that results in greatly enhanced rate performances. The key role of chemical treatment is to enable the partial conversion of Co2+ to a more conductive Co3+ state that stimulates charge transfers. Simultaneously, the defects on the LHs caused by the selective etching of Al promoted the electrolyte diffusion within LHs. As a result, the LHs show a high specific capacitance of 738 F g−1 at 30 A g−1, which is 57.2% of 1289 F g−1 at 1 A g−1. The strategy provides a facile and effective method to achieve high performance LHs for supercapacitor electrode materials.
ISSN: 1614-6832
DOI: 10.1002/aenm.201301240
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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