Journal
MATERIALS LETTERS
Volume 162, Issue -, Pages 67-70Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2015.09.123
Keywords
Porous materials; Nanoparticles; Nanourchins; NiO; Specific capacitance
Funding
- National Natural Science Foundation of China [51302328]
- Fundamental Research Funds for the Central Universities [CDJPY12130002, 106112015CDJXY130006]
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An urchin-like porous NiO electrode material was synthesized via a simple hydrothermal method. The urchin-like NiO architectures are constructed by numerous nanorods which are assembled by irregular nanoparticles with a diameter ranging from 5 to 10 nm. Electrode materials based on the mesoporous NiO nanourchins exhibited high specific capacitance value (540.5 F g(-1)) at a current density (1 A g(-1)), as well as good cycling stability. This excellent performance may be attributed to following factors: (1) a large specific surface area and more active sites provided by the unique hierarchical architectures; (2) effective contaction and diffusion between the electrode and electrolyte owing to the porous urchin-like structure; (3) the interconnected interspaces among the nanoparticles, which serve as an ion reservoirs to shorten ion diffusion length. (C) 2015 Elsevier B.V. All rights reserved.
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