Superior Cycle Stability Performance of Quasi-Cuboidal CoV₂O₆ Microstructures as Electrode Material for Supercapacitors

Abstract

In this study, a rapid, facile, and environment-friendly microwave-assisted method followed by annealing for synthesizing the quasi-cuboidal CoVO is developed. The as-prepared samples manifest high supercapacitor properties with a specific capacitance of 223 F g, good rate capability, and superior cycle stability, retaining 123.3% capacitance when the number of cycles reaches 15,000 after determined by electrochemical tests. More importantly, the quasi-cuboidal CoVO for the first time is introduced into the supercapacitor as a kind of electrode material. The superior electrochemical performance of the quasi-cuboidal CoVO will render the metal vanadium oxides as new and attractive active material for promising application in supercapacitors.

Suppressing the metal-metal interaction by CoZn0.5V1.5O4 derived from two-dimensional metal-organic frameworks for supercapacitors

“…In the Raman spectra of CoZn 0.5 V 1.5 O 4 and Co 2 VO 4 (Fig. 2b), the peak at 807 cm −1 corresponds to V-O bonds [54], and the peaks at 314 and 477 cm −1 are attributed to the tetrahedral Co-O bonds [52,55,56]. Moreover, the peak at 678 cm −1 , which is attributed to the octahedral Co-O bonds of Co 2 VO 4 , almost disappeared in CoZn 0.5 V 1.5 O 4 , and no peaks corresponding to ZnCo-MOF (Fig.…”

Optimizing the Supercapacitive Performance and Cyclability of Ni(OH)2 by Combining with CuO Concomitant with Mutual Doping

“…Electrochemical impedance spectra (EIS) are generally employed to analyze the fundamental property of SC electrode materials . The Nyquist plots in Figure similarly include a straight line in the low frequency range (Warburg impedance Z w concerning with the ion diffusion in the electrode materials), a small semicircle at the high frequency (associating with Faradic charge‐transfer resistance R ct resulted from the active material particles and active material/collector), as well as a non‐zero intercept at Z re ‐axis representing for the electrolyte resistance R s . The R ct values are 0.2, 0.3, and 0.6 Ω for CuNi, Cu 0.75 Ni and CuNi 0.75 , respectively.…”

Synthesis of Homogeneous Hollow Co3O4 Microspheres for Enhanced Cycle Life and Electrochemical Energy Storage Performance

“…Hybrid supercapacitors, as an important energy storage device, possess high potential for application in many areas owing to several advantages, such as high power density, fast charge/discharge process, long‐term cycle life and eco‐friendly, which can shorten the big gap of power density and energy density between conventional capacitors and batteries. According to the charge storage mechanisms, supercapacitors can usually be divided into two types, one is a double‐layer capacitor that stores the charge at the interface between the electrode of the capacitor and the electrolyte solution, and the other is a pseudocapacitor that stores the charge by Faraday reaction occurring on the surface of the electroactive material on the electrode . Faraday pseudocapacitor have attracted wide attention, because it can be generated not only on the surface of the electrode, but also the active site of redox can penetrate into the interior of the electrode.…”

“…According to the charge storage mechanisms, supercapacitors can usually be divided into two types, one is a double-layer capacitor that stores the charge at the interface between the electrode of the capacitor and the electrolyte solution, and the other is a pseudocapacitor that stores the charge by Faraday reaction occurring on the surface of the electroactive material on the electrode. [5][6][7] Faraday pseudocapacitor have attracted wide attention, because it can be generated not only on the surface of the electrode, but also the active site of redox can penetrate into the interior of the electrode. Therefore, it has higher capacitance and energy density than electric double layer capacitors.…”