Reagent-assisted hydrothermal synthesis of NiCo₂O₄nanomaterials as electrodes for high-performance asymmetric supercapacitors

Abstract

In this study, mesoporous nickel cobaltate (NiCo2O4) nanomaterials were loaded onto nickel foam through a simple and environment-friendly reagents assisted hydrothermal method. The impacts of reagents on the micro-morphology and...

Oxygen defect-mediated NiCo2O4 nanosheets as the electrode for pseudocapacitors with improved rate capability

“…Obviously, this ASC can deliver an energy density of 35.9 W h kg −1 at a power density of 200 W kg −1 , and even if the power density is increased to 6400 W kg −1 , the energy density can still be up to 22.4 W h kg −1 . Such excellent electrochemical properties of as-fabricated ASC are better than those reported on C–NiCo 2 O 4 //C (29.4 W h kg −1 , 253 W kg −1 ), 47 NiCo/NiO/NiCo 2 O 4 //AC (28.1 W h kg −1 , 415 W kg −1 ), 48 N-rGO/NiCo 2 O 4 //N-rGO (14.9 W h kg −1 , 3500 W kg −1 ), 49 NiCo 2 O 4 /NiO//AC (31.4 W h kg −1 , 750 W kg −1 ), 50 NiCo 2 O 4 –NiCoO 2 /rGO//rGO (10.1 W h kg −1 , 4000 W kg −1 ), 51 NiCo 2 O 4 //AC (22.5 W h kg −1 , 800 W kg −1 ), 52 NiCo 2 O 4 /N-rGO//AC (20.1 W h kg −1 , 721 W kg −1 ). 53…”

Supercapacitor Supported by Nickel, Cobalt and Conducting Polymer Based Materials: Design Techniques and Current Advancement

“…Moreover, the reagent during synthesis enhanced the specific surface area and charge transport of NiCo 2 O 4. As a result, the cyclic stability, rate performance and specific capacitance of NiCo 2 O 4 quantum dots based in asymmetric SCp found to be increased [23]. Binder used during the fabrication of electrode increase the electrode resistance which further decreases the electrochemical performance and cycle life of SCp.…”

Surfactant-assisted morphology modification of nanostructured MnMoO4 for high-performance asymmetric supercapacitors

“…It forms a thick protective layer on the surface of the particles to assist crystal formation. 31 Another significant surfactant is PVA (polyvinyl alcohol), which has a high water solubility, carbon chain backbone with connected hydroxyl groups, and improved material stability. The hydroxyl groups on the PVA chains can form hydrogen bonds with a variety of anions, increasing the metal salt's solubility in PVA-containing solutions.…”