Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 6, Pages 7787-7792Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.01.213
Keywords
Supercapacitor; NiO; MnO2; Energy storage
Categories
Funding
- National Natural Science Foundation of China [51104194, 21576034]
- International S&T Cooperation Projects of Chongqing [CSTC2013gjhz90001]
- National Key laboratory of Fundamental Science of Micro/Nano-Device and System Technology [2013MS06]
- State Education Ministry
- Fundamental Research Funds for the Central Universities [CDJZR14135501]
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A simple, template-free strategy without organic dispersant or capping agent is developed to synthesize a novel monodispersed NiO@MnO2 nanostructure as powdery electrode for supercapacitors. The first step in the synthesis involves the NaOH mediated evolution of Ni(OH)(2) nanosheets, further leading to the formation of NiO structure with different features. After calcination in air, via self-decomposition of KMnO4 solution in a lower concentration, MnO2 nanoflakes are elaborately grafted along the petal of NiO microspheres to form core-shell nanostructures, enhancing specific surface area and homogenizing pore-size distribution of NiO@MnO2. Owing to the hierarchical core-shell heterostructure configuration with rich mesoporous and synergetic contribution from the NiO core and MnO2 shell, NiO@MnO2 exhibits relatively high specific capacitance and good rate capability, which are better than those of the individual NiO structure. The enhanced performance of the NiO@MnO2 core-shell structure demonstrates that integrated spherical structure constructed by two high capacitance materials is a rational design, which holds definite potential in supercapacitors and other kinds of energy storage systems. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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