Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 483, Issue -, Pages 73-83Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2016.07.068
Keywords
Excellent supercapacitor performance; Mesoporous structure; MnO2; NiO; Co3O4; Quasi-nanospheres; High surface area
Categories
Funding
- National Natural Science Foundation of China [51272107, 51372118, 51322212]
- National Postdoctoral Science Foundation [150123]
- Open Fund of Key Laboratory of Functional Molecular Solids of Ministry of Education [14001]
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In this report, we obtain mesoporous transition metal oxides quasi-nanospheres (includes MnO2, NiO, and Co3O4) by utilizing mesoporous silica nanospheres as a template for high-performance supercapacitor electrodes. All samples have a large specific surface area of approximately 254-325 m(2) g(-1) and a relatively narrow pore size distribution in the region of 7 nm. Utilization of a nanosized template resulted in a product with a relative uniform morphology and a small particle diameter in the region of 50-100 nm. As supercapacitor electrodes, MnO2, NiO, and Co3O4 exhibit an outstanding capacity as high as 838-1185 F g(-1) at 0.5 A and a superior long-term stability with minimal loss of 3-7% after 6000 cycles at 1 A g(-1). Their excellent electrochemical performances are attributed to favorable morphologies with a large surface area and a uniform architecture with abundant pores. The associated enhancement of electrolyte ion circulation within the electrode facilitates a significant increase in availability of Faradic reaction electroactive sites. (C) 2016 Elsevier Inc. All rights reserved.
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