Highly mesoporous structure nickel cobalt oxides with an ultra-high specific surface area are synthesized through a sol–gel method by using silica derived from tetraethoxysilane hydrolysis as a template. The structural and morphological characteristics of the oxides are determined using X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and N2 adsorption experiments. The electrochemical properties, including capacitance, of the oxides are analyzed through cyclic voltammetry, AC impedance spectroscopy, and charge–discharge tests in 7 M KOH under ambient conditions. The as-prepared nickel cobalt oxides possessing an ultra-high specific surface area of 438.3 m2 g−1 and a mesoporous structure exhibit a high specific capacitance of 1157.7 F g−1 and a long-term cyclic stability (97.13 % capacity retention after 5000 cycles). Thus, the prepared oxides are promising for supercapacitor applications.

Full Text

Published Version
Open DOI Link

Get access to 115M+ research papers

Discover from 40M+ Open access, 2M+ Pre-prints, 9.5M Topics and 32K+ Journals.

Sign Up Now! It's FREE

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call