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Direct Chemical Synthesis of MnO2Nanowhiskers on Transition-Metal Carbide Surfaces for Supercapacitor Applications
Abstract
Transition-metal carbides (MXenes) are an emerging class of two-dimensional materials with promising electrochemical energy storage performance. Herein, for the first time, by direct chemical synthesis, nanocrystalline ε-MnO2 whiskers were formed on MXene nanosheet surfaces (ε-MnO2/Ti2CTx and ε-MnO2/Ti3C2Tx) to make nanocomposite electrodes for aqueous pseudocapacitors. The ε-MnO2 nanowhiskers increase the surface area of the composite electrode and enhance the specific capacitance by nearly 3 orders of magnitude compared to that of pure MXene-based symmetric supercapacitors. Combined with enhanced pseudocapacitance, the fabricated ε-MnO2/MXene supercapacitors exhibited excellent cycling stability with ∼88% of the initial specific capacitance retained after 10000 cycles which is much higher than pure ε-MnO2-based supercapacitors (∼74%). The proposed electrode structure capitalizes on the high specific capacitance of MnO2 and the ability of MXenes to improve conductivity and cycling stability.
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Metadata
- Authors
- Rakhi, R. B., Ahmed, B., Anjum, D., & Alshareef, H. N.
- Venue
- ACS Applied Materials & Interfaces
- Publisher
- American Chemical Society (ACS)
- Published
- 2016-07-14
- Volume
- 8
- Issue
- 29
- Pages
- 18806-18814
- ISSN
- 1944-8244 (ISSN-L)
- 1944-8252
- OpenAlex
- W2483898135
- Cited by
- 439
- References
- 0
- FWCI
- 11.76
- Type
- journal article
- Language
- en
- Open access
- closed
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