Microwave-assisted synthesis of hybrid CoxNi1-x(OH) 2 nanosheets: Tuning the composition for high performance supercapacitor

Gen Chen; Steven S. Liaw; Binsong Li; Yun Xu; Marco Dunwell; Shuguang Deng; Hongyou Fan; Hongmei Luo

doi:10.1016/j.jpowsour.2013.11.070

Microwave-assisted synthesis of hybrid Co_xNi_1-x(OH) ₂ nanosheets: Tuning the composition for high performance supercapacitor

Gen Chen, Steven S. Liaw, Binsong Li, Yun Xu, Marco Dunwell, Shuguang Deng, Hongyou Fan, Hongmei Luo

Research output: Contribution to journal › Article › peer-review

98 Scopus citations

Abstract

Hybrid Co_xNi_1-x(OH)₂ nanosheets have been successfully synthesized via a facile microwave-assisted synthetic route. The size of Co_xNi_1-x(OH)₂ nanosheets decreases with the increase of nickel amount; however, the layered crystal structure can be maintained at any ratios of Co:Ni due to the chemical and physical similarities between these two elements. The lattice spacing of the hexagonal nanosheets can be slightly varied by adjusting the ratios of Co:Ni. The hybrid Co _0.2Ni_0.8(OH)₂ hexagonal nanosheets deliver a high capacity of above 1170 F g^-1 at a current density of 4 A g ^-1. The higher specific capacitance of Co_0.2Ni _0.8(OH)₂ nanosheets than their monometallic counterpart could be attributed to the enhancement of the electro-active sites participated in the redox reaction due to the possible valence interchange or charge hopping between Co and Ni cations. These results indicate the importance of layered hydroxide nanosheets with tuned transition-metal composition for high-performance energy storage devices.

Original language	English (US)
Pages (from-to)	338-343
Number of pages	6
Journal	Journal of Power Sources
Volume	251
DOIs	https://doi.org/10.1016/j.jpowsour.2013.11.070
State	Published - Apr 1 2014
Externally published	Yes

Keywords

Electrochemical
Hybrid hydroxides
Microwave-assisted
Nanosheet
Supercapacitors

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

Access to Document

10.1016/j.jpowsour.2013.11.070

Cite this

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title = "Microwave-assisted synthesis of hybrid CoxNi1-x(OH) 2 nanosheets: Tuning the composition for high performance supercapacitor",

abstract = "Hybrid CoxNi1-x(OH)2 nanosheets have been successfully synthesized via a facile microwave-assisted synthetic route. The size of CoxNi1-x(OH)2 nanosheets decreases with the increase of nickel amount; however, the layered crystal structure can be maintained at any ratios of Co:Ni due to the chemical and physical similarities between these two elements. The lattice spacing of the hexagonal nanosheets can be slightly varied by adjusting the ratios of Co:Ni. The hybrid Co 0.2Ni0.8(OH)2 hexagonal nanosheets deliver a high capacity of above 1170 F g-1 at a current density of 4 A g -1. The higher specific capacitance of Co0.2Ni 0.8(OH)2 nanosheets than their monometallic counterpart could be attributed to the enhancement of the electro-active sites participated in the redox reaction due to the possible valence interchange or charge hopping between Co and Ni cations. These results indicate the importance of layered hydroxide nanosheets with tuned transition-metal composition for high-performance energy storage devices.",

keywords = "Electrochemical, Hybrid hydroxides, Microwave-assisted, Nanosheet, Supercapacitors",

author = "Gen Chen and Liaw, {Steven S.} and Binsong Li and Yun Xu and Marco Dunwell and Shuguang Deng and Hongyou Fan and Hongmei Luo",

note = "Funding Information: H.L. acknowledges the funding support from NSF/CMMI NanoManufacturing Program under Grant No. 1131290 . G. C. is supported by the office of Vice President for Research at NMSU . S. S. L. is supported by NASA under Grant No. GR0003400 . This work is partially supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering . Sandia is a multiprogram laboratory operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under Contract DE-AC04-94AL85000 . ",

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doi = "10.1016/j.jpowsour.2013.11.070",

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T1 - Microwave-assisted synthesis of hybrid CoxNi1-x(OH) 2 nanosheets

T2 - Tuning the composition for high performance supercapacitor

AU - Chen, Gen

AU - Liaw, Steven S.

AU - Li, Binsong

AU - Xu, Yun

AU - Dunwell, Marco

AU - Deng, Shuguang

AU - Fan, Hongyou

AU - Luo, Hongmei

N1 - Funding Information: H.L. acknowledges the funding support from NSF/CMMI NanoManufacturing Program under Grant No. 1131290 . G. C. is supported by the office of Vice President for Research at NMSU . S. S. L. is supported by NASA under Grant No. GR0003400 . This work is partially supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering . Sandia is a multiprogram laboratory operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under Contract DE-AC04-94AL85000 .

PY - 2014/4/1

Y1 - 2014/4/1

N2 - Hybrid CoxNi1-x(OH)2 nanosheets have been successfully synthesized via a facile microwave-assisted synthetic route. The size of CoxNi1-x(OH)2 nanosheets decreases with the increase of nickel amount; however, the layered crystal structure can be maintained at any ratios of Co:Ni due to the chemical and physical similarities between these two elements. The lattice spacing of the hexagonal nanosheets can be slightly varied by adjusting the ratios of Co:Ni. The hybrid Co 0.2Ni0.8(OH)2 hexagonal nanosheets deliver a high capacity of above 1170 F g-1 at a current density of 4 A g -1. The higher specific capacitance of Co0.2Ni 0.8(OH)2 nanosheets than their monometallic counterpart could be attributed to the enhancement of the electro-active sites participated in the redox reaction due to the possible valence interchange or charge hopping between Co and Ni cations. These results indicate the importance of layered hydroxide nanosheets with tuned transition-metal composition for high-performance energy storage devices.

AB - Hybrid CoxNi1-x(OH)2 nanosheets have been successfully synthesized via a facile microwave-assisted synthetic route. The size of CoxNi1-x(OH)2 nanosheets decreases with the increase of nickel amount; however, the layered crystal structure can be maintained at any ratios of Co:Ni due to the chemical and physical similarities between these two elements. The lattice spacing of the hexagonal nanosheets can be slightly varied by adjusting the ratios of Co:Ni. The hybrid Co 0.2Ni0.8(OH)2 hexagonal nanosheets deliver a high capacity of above 1170 F g-1 at a current density of 4 A g -1. The higher specific capacitance of Co0.2Ni 0.8(OH)2 nanosheets than their monometallic counterpart could be attributed to the enhancement of the electro-active sites participated in the redox reaction due to the possible valence interchange or charge hopping between Co and Ni cations. These results indicate the importance of layered hydroxide nanosheets with tuned transition-metal composition for high-performance energy storage devices.

KW - Electrochemical

KW - Hybrid hydroxides

KW - Microwave-assisted

KW - Nanosheet

KW - Supercapacitors

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