Fabrication of Bimetallic Oxides (MCo2O4: M=Cu, Mn) on Ordered Microchannel Electro-Conductive Plate for High-Performance Hybrid Supercapacitors

Abstract

AB2O4-type binary-transition metal oxides (BTMOs) of CuCo2O4 and MnCo2O4 were successfully prepared on ordered macroporous electrode plates (OMEP) for supercapacitors. Under the current density of 5 mA cm−2, the CuCo2O4/OMEP electrode achieved a specific capacitance of 1199 F g−1. The asymmetric supercapacitor device prepared using CuCo2O4/OMEP as the positive electrode and carbon-based materials as the negative electrode (CuCo2O4/OMEP//AC) achieved the power density of 14.58 kW kg−1 under the energy density of 11.7 Wh kg−1. After 10,000 GCD cycles, the loss capacitance of CuCo2O4/OMEP//AC is only 7.5% (the retention is 92.5%). The MnCo2O4/OMEP electrode shows the specific and area capacitance of 843 F g−1 and 5.39 F cm−2 at 5 mA cm−2. The MnCo2O4/OMEP-based supercapacitor device (MnCo2O4/OMEP//AC) has a power density of 8.33 kW kg−1 under the energy density of 11.6 Wh kg−1 and the cycle stability was 90.2% after 10,000 cycles. The excellent power density and cycle stability prove that the prepared hybrid supercapacitor fabricated under silicon process has a good prospect as the power buffer device for solar cells.

Biomass Activated Carbon Composites and Their Potential in Supercapacitor Applications: Current Trends and Future Perspectives

“…82 Because of their high SSA, high rate performance, exceptional cycle stability, and outstanding structural adaptability, BMOs are considered to be promising electroactive materials for supercapacitors. 83,84 87,88 are of interest to many scientists, because of their high theoretical capacitance, high electrical conductivity, rich chemical composition, multivalent oxidation states, and minimal toxic effects. 37,85,89 Due to its inherent properties, such as high electrochemical redox activity and rich chemical compositions consisting of spinel-type oxide structure, in which the nickel takes up the octahedral position and the cobalt is stationed at octahedral and tetrahedral locations, NiCo 2 O 4 has attracted the most research interest among the BMOs.…”

“…The spinel cobaltites MCo 2 O 4 (M = Mn, Ni, Cu, or Zn), one of the most well-known BMOs, has gained a lot of attention, since it can store many charges, due to its multiple redox states, which participate in reversible faradaic reactions and significantly improves the pseudocapacitive behavior . Because of their high SSA, high rate performance, exceptional cycle stability, and outstanding structural adaptability, BMOs are considered to be promising electroactive materials for supercapacitors. , Particularly, transition-metal cobaltites such as ZnCo 2 O 4 , MnCo 2 O 4 , CuCo 2 O 4 , and NiCo 2 O 4 , , are of interest to many scientists, because of their high theoretical capacitance, high electrical conductivity, rich chemical composition, multivalent oxidation states, and minimal toxic effects. ,, …”

Construction of α-MnO2 on Carbon Fibers Modified with Carbon Nanotubes for Ultrafast Flexible Supercapacitors in Ionic Liquid Electrolytes with Wide Voltage Windows

“…The specific capacitance of the composite electrodes C s was calculated by Equation (1) and the energy density (E) and power density (P) were calculated by Equations ( 2) and (3), respectively [26,27]:…”

Development of Binder Free Interconnected 3D Flower of NiZn2O4 as an Advanced Electrode Materials for Supercapacitor Applications

“…The CV curves also suggest that, at a high scan rate, the peak slightly shifted to the initial position, which indicates the lower polarization of the electrode materials, and the fast electron and ion transport rates during electrochemical processes. On the basis of an electroanalytical point of view, the small potential difference in the anodic and cathodic peaks may be attributed to the reversible electrochemical reaction, which can be explained with the help of the following reaction, Equations ( 4) and ( 5) [8,9]:…”

“…Supercapacitors (SCs) have advantages compared to batteries, such as low internal resistance, long life, power density, light weight, and portability. SCs can be categorized according to the mechanism of electrochemical reaction during the charge-discharge process [8][9][10]. The rapid faradaic redox reaction that occurs during the electrochemical reaction is characteristic of SCs of the pseudocapacitor category, and the interface between the electrolyte and the electrode surface during the electrochemical process characterizes SCs of the double-layered capacitor category.…”