Progress in Spinel‐Structured Cobaltite‐Based Positive Electrode Materials for Supercapacitors

Abstract

In recent days, the family of spinel cobaltites with multiple oxidation states has received much attention as an electrode material for supercapacitors. Profiting from its superior electrochemical performance, these cobaltites play a significant role in energy storage and conversion devices. In this review, we provided an in‐depth description of spinel cobaltites. Further, we review several cobaltites and their composites, corresponding synthesis methods, and the application of these materials for supercapacitors. As a result of several extraordinary outputs, spinel cobaltites are likely to be widely studied in the future.

Overview of the oxygen vacancy effect in bimetallic spinel and perovskite oxide electrode materials for high-performance supercapacitors

“…Thus, spinels maintain 8 tetrahedral and 4 octahedral effective voids. 59,60 They can accommodate a wide range of lattice points in the form of cations, which are usually higher than their actual oxidation states. Therefore, their physical and chemical properties depend on the types of cations in the related spinels and their site occupancy factor.…”

Construction of a binder-free PANI-CQD-Cu electrode via an electrochemical method for flexible supercapacitor applications

“…[1][2][3] Particularly, exible supercapacitors (FSCs) have more signicant advantages such as exibility, high energy density and light weight. Moreover, FSCs have better capacitance and electrochemical activity [4][5][6] due to the synergistic effect and larger surface area of electrode materials prepared by a combination of conducting polymers, 7 metal oxides 8,9 and carbon-based 10,11 materials. It is well known that exible electrode substrates such as cotton fabric, carbon paper and carbon cloth are commonly used for FSC applications.…”

Preparation of nickel foam modified by multiwalled hollow spheres of NiCo2O4 as a promising non-enzymatic glucose sensor

“…7 Combining nickel with cobalt to form spinel NiCo 2 O 4 for use as an electrocatalyst has received major attention in many electrochemical applications, such as water splitting, supercapacitor, and chemical sensing. [8][9][10][11][12][13][14] In addition, one of the key factors to obtain a favourable electrocatalyst for use as a working electrode is by modifying its structure and morphology, which could further affect its sensing performance due to the increase of the electrode's surface area.…”