High-performance asymmetric supercapacitor based on CdCO₃/CdO/Co₃O₄composite supported on Ni foam

Abstract

This work presents for the first time a CdCO3/CdO/Co3O4@nickel foam based supercapacitor with high both specific capacitance and energy density, a widespread potential window and a long cycle life.

High-performance asymmetric supercapacitor based on a CdCO3/CdO/Co3O4 composite supported on Ni foam – part II: a three-electrode electrochemical study

“…The generation and evolution of CO 2 as a result of the chemical decomposition of previously generated cadmium carbonate and the dehydration of cobalt hydroxide, both compounds formed during the hydrothermal phase process, could explain the occurrence of these nanopores. 47,51,69…”

“…The generation and evolution of CO 2 as a result of the chemical decomposition of previously generated cadmium carbonate and the dehydration of cobalt hydroxide, both compounds formed during the hydrothermal phase process, could explain the occurrence of these nanopores. 47,51,69 The surface chemical composition of the annealed hydrothermal product (from a cadmium + cobalt based bath), including the oxidation states and extent of surface impurities have been analyzed by X-ray photoelectron spectroscopy (XPS). XPS is a surface sensitive technique that can disclose elemental and chemical information about any solid material surface region.…”

“…This phenomenon can be related to the activation processes of the material and has been previously reported in electrodes for supercapacitors based on CdS@NF. 51,57 To study the storage kinetics of the CdCO 3 /CdO/ Co 3 O 4 @NF electrode and its relationship with the nano/ microporous morphology of the cubes of the electrode material, the dependence between C S and charging time (t c ) for the different assayed current density values has been analyzed (see Fig. 6d).…”

“…The good performance of this multiphase CdCO 3 /CdO/Co 3 O 4 compound as an efficient active electrode material (tested in a two-electrode supercapacitor device), has been reported in our previously published paper. 51 Two-electrode test and packaged cells differ from three-electrode cells in several important aspects. The two-electrode setup is appropriate for fully assembled cells and it will more closely represent the performance of the final design.…”

Intriguing and Facile Preparation Approach of CdO Nanorod-Based Abundant Chitosan for Symmetric Supercapacitors

“…The explicit capacitance ( C sp , F g –1 ), the specific energy (SE, Wh kg –1 ), and specific power (SP, W kg –1 ) were computed based on information gathered from the GCD and CV calculations, and coulombic efficiency (η %) was measured as published earlier. ,, …”