Influence of Stirring Time on the Electrochemical Properties of NiCo₂S₄ Hexagonal Plates and NiCo−OH Nanoparticles as High‐Performance Pseudocapacitor Electrode Materials

Abstract

This study investigated the morphology dependent electrochemical behavior tuned with different stirring times (1, 5, 10, 20, 40 min, and 1 hr.) for NiCo2S4 hexagonal plate (NCS hexagonal plate) and NiCo−OH nanoparticles (NiCo−OH NPs). The altered nanostructure properties are well supported by in‐depth structural and morphological analysis. When used as electrodes for supercapacitor, both NCS hexagonal plates and NiCo−OH NPs (prepared at stirring time of 20 min and 5 min, respectively) exhibit maximum specific capacitances of 833 and 733 mF cm−2 at the current density of 10 mA cm−2 along with superior rate and stable cycling performance due to their beneficial structural features. Moreover, the stability study showed 69.0 % and 67.0 % capacitance retention after 5000 cycles, indicating excellent stability of the samples. These outstanding properties manifest that the unique hierarchical structures promised as a suitable electrode material for the energy storage field shortly.

Charge Storage Performance of Cubic Cu3TeO6 Nanoparticles for Supercapattery Application

“…The inset of Figure (c) shows the IR drop for the Cu 3 TeO 6 electrode. With increasing the current density the IR drop contribution proportionally increases, but in the case of Cu 3 TeO 6 electrode the IR drop is noticeably lower (∼0.08 V) even at a high current density of 150 A g –1 , indicating the presence of shorter ion diffusion channels and more active sites at the electrode–electrolyte contact Figure (d) shows a plot of specific capacity (C g –1 ) and capacity degradation percentage with respect to the current density that demonstrates good rate performance of the Cu 3 TeO 6 electrode.…”

Honeycomb‐based heterostructures: An emerging platform for advanced energy applications: A review on energy systems

“…First, ions detach and collect at the electrolyte/electrode contact, as in electrochemical double-layer capacitors made of porous carbonaceous materials [113,114] . Redox reactions involving electroactive species and electrode materials such as conductive polymers, metal oxides/hydroxides, or metal sulfides, as well as so-called pseudo-capacitors, are the second type of reation [39,118,119] . The capacitance of supercapacitors is proportional to the effective surface area of electrode materials and is derived from the electroactive charge accommodation at the electrodes and electrolytes interface.…”