Highly dispersed ultrasmall Ni(OH)2 aggregated particles on a conductive support as a supercapacitor electrode with superior performance

J Colloid Interface Sci. 2017 Mar 15:490:252-258. doi: 10.1016/j.jcis.2016.11.072. Epub 2016 Nov 21.


To reduce the size of Ni(OH)2 aggregates is an effective way to improve their capacitive performance for the electrodes of supercapacitors. The ultrasmall Ni(OH)2 aggregates (1-2nm) on active carbon (AC) can be obtained by depositing the soluble precursor of Ni(OH)2 on AC at low temperature. The Ni(OH)2/AC samples were characterized by SEM, TEM, XRD and XPS. The specific capacitance of ultrasmall Ni(OH)2 aggregates in the Ni(OH)2/AC composite can reach 2949Fg-1 at a scan rate of 20mVs-1, which is higher than its theoretical specific capacitance (2382Fg-1). Ni(OH)2 aggregates supported on carbon cloth can also exhibit superior specific capacitance as a bind-free flexible electrode. The capacitive, rate and cycling performance of ultrasmall Ni(OH)2 aggregates on AC are excellent, revealing the great potential of ultrasmall sized materials in energy storage.

Keywords: Electrochemical energy; Ni(OH)(2); Pseudocapacitors; Specific capacitance; Supercapacitors; Ultrasmall size.