Journal
JOURNAL OF MATERIALS RESEARCH
Volume 29, Issue 1, Pages 107-114Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2013.238
Keywords
nanostructure; energy storage; hydrothermal
Categories
Funding
- National Science Council of Taiwan [NSC-101-2113-M-005-014-MY3, NSC 101-2628-M-007-006]
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We present a simple and quick procedure for the one-pot synthesis of manganese oxides under a basic solvothermal condition in the presence of cationic surfactants acting as the template in a 2-butanol/water solution. Three-dimensional spinel-type MnO2 microspheres composed of small nanoparticles have been fabricated for the first time using our method. Their corresponding electrochemical performances in the applications of supercapacitor electrodes exhibit a good specific capacitance (SC) value of similar to 190 F/g at 0.5 A/g and excellent SC retention and Coulombic efficiency of similar to 100% and similar to 95% after 1000 charge/discharge cycles at 1 A/g, respectively. This suggests its potential applications in energy storage devices. Further, we demonstrate that this solvothermal technique enables the morphological tuning of manganese oxides in various forms such as schists, rods, fibers, and nanoparticles. This work describes a rapid and low-cost technique to fabricate novel architectures of manganese oxides having the desired crystal phase, which will highly benefit various supercapacitor applications.
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