| 초록 |
Hierarchical microspheres composed of wrinkled α-Ni(OH)2 nanosheets were synthesized from aqueous solution containing nickel salts, hexamethylenetetramine, 1-butanol, and dodecyl sulfate. The intercalated dodecyl sulfate anions in the product could be exchanged by smaller anions (Cl, NO3, OAc, and SO42) while retaining the morphology of the microspheres.The electrochemical and capacitive properties of the anion-exchanged materials were studied by cyclic voltammetry and galvanostatic charging-discharging. Interestingly, the specific capacitance was not determined by the basal spacing, but the intercalated anions. SO42, the largest anion, gave the lowest specific capacitance, whereas Cl, the smallest anion, gave the highest specific capacitance. It is proposed that larger anions can block the movement of OH ions and protons toward surface of Ni(OH)2 layers. |
