Journal
CHEMPLUSCHEM
Volume 80, Issue 1, Pages 181-187Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cplu.201402214
Keywords
alpha phase; nanostructures; nickel-cobalt hydroxides; one-pot synthesis; supercapacitors
Categories
Funding
- Wuhan Planning Project of Science and Technology [2013011801010594]
- National Natural Science Foundation of China [51302097]
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A novel and facile one-step method for growing alpha-phase nickel-cobalt hydroxides is developed. The use of 1-methyl-2-pyrrolidone (NMP) in the mixed solvent plays the decisive role in the precipitation of metal ions and the formation of alpha-phase hydroxides. The synthetic method is robust enough to synthesize Ni-Co hydroxides with different stoichiometric ratios of Ni and Co, and can be extended to the fabrication of Ni0.67Zn0.33 hydroxide in the alpha phase. More encouragingly, the method employed can be further used to grow layered nickel-cobalt hydroxides on Ni foam. As the electroactive materials for pseudocapacitors, the Ni-Co hydroxides deliver an ultrahigh specific capacitance (1337.4 Fg(-1) at 1 Ag-1 for Ni0.67Co0.33 hydroxide) with improved rate capability and cycling stability. Moreover, a greatly increased specific capacitance (2248.9 and 2286.7 Fg(-1) at 1 Ag-1 for Ni0.5Co0.5 and Ni0.67Co0.33 hydroxides, respectively) with superior cycling stability is obtained after growth on Ni foam.
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