Hydrothermal Synthesis of Binder-Free Metallic NiCo2O4 Nano-Needles Supported on Carbon Cloth as an Advanced Electrode for Supercapacitor Applications

Abstract

It is of great significance to design electrochemical energy conversion and storage materials with excellent performance to fulfill the growing energy demand. Bimetallic cobalt/nickel-based electrode materials exhibit excellent electrical conductivity compared to mono oxides. However, their potential as electrode materials for high-performance supercapacitors (SCs) is limited because of their poor cycling stability and high-capacity fading. This work demonstrates the synthesis of binder-free bimetallic NiCo2O4 nano-needles supported on CC (NCO@CC) via a facile and scalable hydrothermal process. Excellent electrical conductivity and interconnected nanostructure of NCO@CC nano-needles provide the fast transfer of electrons with numerous channels for ion diffusion. Owing to such features, the binder-free NCO@CC electrode for SC discloses excellent specific capacitance (1476 Fg−1 at 1.5 Ag−1) with 94.25% capacitance retention even after 5000 cycles. From these outstanding electrochemical performances, it can be inferred that NCO@CC nano-needle array-structured electrodes may be potential candidates for SC applications.

Electric field-assisted laser ablation fabrication and assembly of zinc oxide/carbon nanocomposites into hierarchical structures for supercapacitor electrodes

“…Third, the formation of a binder-free electrode, as discussed above, ensures close contact between nanostructured counterparts, thereby reducing the interfacial resistance effects. As it was observed in the literature, 76,77 this results in the materials with an increased capacitance due to fast electron transfer with numerous channels for ion diffusion. In ref.…”

ZIF-8@CoFe2O4 as a highly efficient bifunctional electrocatalyst for the methanol oxidation and oxygen evolution reactions

“…Transition bimetallic oxides are employed in electrochemistry because they have numerous advantages, including easy synthesis, low cost, strong electrical conductivity compared with monoxides, and nontoxicity. 31,32 The well-known inverse spinel cobalt ferrite (CoFe 2 O 4 ) has Co 2+ ions on the B sites, whereas Fe 3+ ions are evenly distributed between the A and B sites. 33 Due to its chemical stability, high coercivity, water resistance, moderate saturation magnetization, and electrical insulation, cobalt ferrite is gaining popularity among bimetallic oxides.…”

“…The synthesized composite was applied in the synergistic electrochemical oxidation of pesticides, including niclosamide, dichlorophen, carbendazim, and diuron, with outstanding reproducibility, low detection limit, long-term stability, and auspicious performance in real sample detection. 31,32 The well-known inverse spinel cobalt ferrite (CoFe 2 O 4 ) has Co 2+ ions on the B sites, whereas Fe 3+ ions are evenly distributed between the A and B sites. 33 Due to its chemical stability, high coercivity, water resistance, moderate saturation magnetization, and electrical insulation, cobalt ferrite is gaining popularity among bimetallic oxides.…”

Telluride‐Based Materials: A Promising Route for High Performance Supercapacitors

“…[31][32][33] Consequently, SCs are an appropriate alternative to batteries for applications that require rapid energy delivery and uptake, such as electric traction, aerospace, and portable electronics. [34][35][36][37][38][39] Carbons, metal oxides, selenides, nitrides, carbides, sulfides, and phosphides are some of the many materials investigated for their potential in electrochemical energy storage devices. [40][41][42][43][44][45][46][47] The properties of metal chalcogenides (MCs) make them ideal candidates for in-depth research as electrode material for SCs.…”

“…In contrast to batteries, SCs demonstrate superior power density, durability, charging rate, and eco‐friendliness [31–33] . Consequently, SCs are an appropriate alternative to batteries for applications that require rapid energy delivery and uptake, such as electric traction, aerospace, and portable electronics [34–39] …”