Journal
NANO LETTERS
Volume 17, Issue 1, Pages 429-436Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b04427
Keywords
Pillar effect; bimetallic hydroxides; metaborate; graphene; supercapacitor
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Funding
- China Postdoctoral Science Foundation [2012M521760]
- National Natural Science Foundation of China [51602246]
- Fundamental Research Funds for the Central Universities [xjj2014052]
- Australian Research Council Future Fellowship [FT160100251]
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Layered alpha-Ni(OH)(2) and its, derivative bimetallic hydroxides (e.g., alpha-(Ni/Co)(OH)(2)) have attracted much attention due to their high Specific capacitance, although their insufficient cycling stability has blocked their wide application in various technologies. In this work; we demonstrate that the cycling performance of alpha-(Ni/Co)(OH)(2) can be obviously enhanced via the intrinsic pillar effect of metaborate. Combining the high porosity feature of the metaborate stabilized alpha-(Ni/CO)(OH)(2) and the improved electronic conductivity Offered by graphene substrate, the average capacitance fading rate of the metaborate stabilized alpha-(Ni/Co)(OH)(2) is only similar to 0.0017% per cycle within 10 000 cycles at the current density of 5 A g(-1). The rate performance is excellent over a wide temperature range from -20 to 40 degrees C. We believe that the enhancements should mainly be ascribed to the excellent structural stability offered by the metaborate pillars, and the detailed mechanism is discussed.
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