NiCo2O4-Based Supercapacitor Nanomaterials

Abstract

In recent years, the research on supercapacitors has ushered in an explosive growth, which mainly focuses on seeking nano-/micro-materials with high energy and power densities. Herein, this review will be arranged from three aspects. We will summarize the controllable architectures of spinel NiCo2O4 fabricated by various approaches. Then, we introduce their performances as supercapacitors due to their excellent electrochemical performance, including superior electronic conductivity and electrochemical activity, together with the low cost and environmental friendliness. Finally, the review will be concluded with the perspectives on the future development of spinel NiCo2O4 utilized as the supercapacitor electrodes.

Porous Thin-Wall Hollow Co3O4 Spheres for Supercapacitors with High Rate Capability

“…Rapid technological development and accelerated natural resource consumption have largely increased the demand for efficient, environmentally-friendly, cost-effective, and safe energy storage devices [1][2][3][4]. In the last decade, supercapacitors-the new devices between conventional physical capacitors and lithium-ion batteries-have been extensively recognized as one of the most promising candidates for energy storage devices due to their high power density, long cycling lifespan, and fast charge/discharge process [5][6][7][8][9][10][11]. In general, supercapacitors can be divided into two categories according to their energy storage mechanism: One is the electric double-layer capacitor (EDLCs), which is mainly made of carbonaceous materials [12][13][14][15][16]; the other is the faradic redox reaction pseudocapacitor (PsCs), which usually utilizes transition metal oxides/hydroxides as electrode materials [17][18][19][20][21].…”

Highly Hydrophilic Carbon Dots' Decoration on NiCo2O4 Nanowires for Greatly Increased Electric Conductivity, Supercapacitance, and Energy Density

“…Transition metal oxides (TMOs), such as ZnCo 2 O 4 , NiFe 2 O 4 , and FeCo 2 O 4 , are usually applied as electrode materials of the supercapacitors. Among them, nickel cobaltite (NiCo 2 O 4 ) has received extensive attention due to its low cost, high theoretical capacity, and superior electrochemical activity . However, the insufficient active sites, poor electrical conductivity, and the low practical electrochemical performance of NiCo 2 O 4 still hinder its large‐scale applications for supercapacitor .…”

“…However, the insufficient active sites, poor electrical conductivity, and the low practical electrochemical performance of NiCo 2 O 4 still hinder its large‐scale applications for supercapacitor . Great efforts have been made to overcome these shortcomings . For example, it has been reviewed that some researchers try to get over the above disadvantages by modulating the morphologies of NiCo 2 O 4 nanostructures .…”

Facile synthesis of NFL-ZnWO4 for pseudocapacitor applications

“…Therefore, novel and suitable energy storage devices need to be developed. Supercapacitors(SCs), the new devices between conventional physical capacitors and lithium-ion batteries, have been extensively studied to serve as one of the most promising candidates for energy storage because of their high power density, long cycling lifespan and fast charge/discharge process [2]. In general, supercapacitors can be divided into two categories according to the energy storage mechanism: one is the electric double layer capacitors(EDLCs), in which carbonaceous materials have been widely utilized and the other is the Faradaic redox reaction pseudocapacitors(PsCs) usually containing transition metal oxides as the electrode materials [3].…”