Recent advancements in carbon-based composite materials as
The utilization of carbon-materials in composite electrode design has emerged as a promising frontier in supercapacitor applications, offering enhanced performance and
Nickel-based electrode materials, in contrast, offer high-specific capacitance—a feature not inherent in carbon materials. Consequently, there has been a surge in research efforts aiming to construct symmetric supercapacitors using high-capacity nickel-based compounds and their composites.
2.1.1. Nickel cobalt/selenide and graphene composites. NiCo-based supercapacitors, also known as hybrid supercapacitors, combine the high energy density of batteries with the high-power density of traditional electrochemical capacitors. They are designed to provide both high energy and power capabilities for rapid energy storage and release.
The electrochemical properties of supercapacitors on the basis of Ni materials and CNTs composite electrodes are reported in Table 2 144–163 The nanocomposite CNTs/NiCo2S4 showed remarkable capacitive properties. In the structure of the asymmetric supercapacitor, it exhibited energy and power densities of 43.3 W h kg−1 and 800 W kg−1.
Although numerous strategies, such as hierarchical structure design, component optimization, and hybridization, have been deployed to overcome the limitations of nickel-based supercapacitors and have notably enhanced their performance, challenges persist (Fig. 8).
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