Nanostructured (Co, Mn)3O4 for High Capacitive Supercapacitor Applications

Abstract

Nanostructured Co doped Mn3O4 spinel structure ((Co, Mn)3O4) were prepared by co-precipitation under O3 oxidizing conditions and post-heat treatment. The product was composed of nanogranules with a diameter of 20–60 nm. The electrochemical performance of (Co, Mn)3O4 electrode was tested by cyclic voltammetry, impedance, and galvanostatic charge-discharge measurements. A maximum specific capacitance value of 2701.0 F g−1 at a current density of 5 A g−1 could be obtained within the potential range from 0.01 to 0.55 V versus Hg/HgO electrode in 6 mol L−1 KOH electrolyte. When at high current density of 30 A g−1, the capacitance is 1537.2 F g−1 or 56.9% of the specific capacitance at 5 A g−1, indicating its good rate capability. After 500 cycles at 20 A g−1, the specific capacitance remains 1324 F g−1 with a capacitance retention of 76.4%.

3D Lattice‐Matching Layered Hydroxide Heterostructure with Improved Interfacial Charge Transfer and Ion Diffusion for High Energy Density Supercapacitor

“…[11,[13][14][15] The operation of state-of-the-art supercapacitor electrode materials consist of multiple electrochemical steps including the adsorptions of ions, the ions diffusion to active surface, redox reaction, and electrons charge transfer. [8,[16][17][18][19][20] Layered double hydroxide…”

“…[ 11,13–15 ] The operation of state‐of‐the‐art supercapacitor electrode materials consist of multiple electrochemical steps including the adsorptions of ions, the ions diffusion to active surface, redox reaction, and electrons charge transfer. [ 8,16–20 ] Layered double hydroxide (LDH) consist of metallic cations with multivalent states, interlayer anions, and water molecules for charge balance that stabilized as unique layered structures, [ 21–24 ] which have been extensity explored as the potential candidates for supercapacitors applications including NiCo, [ 14,25–28 ] NiMn, [ 29,30 ] CoMn, CoFe, and other doped systems. [ 31 ] In particular, Ni‐based LDHs have a fabulous theoretical specific capacitance of more than 3000 F g −1 .…”

Ultra-long cycle life and binder-free manganese-cobalt oxide supercapacitor electrodes through photonic nanostructuring

“…18,19 Furthermore, the addition of Co impedes the dissolution of Mn into the electrolyte and improves the redox reversibility and stability of the electrode. 20,21 Despite their many advantages, drawbacks including their low conductivity, which also hinders ion diffusion and electron transfer, 22 poor structural stability, small specic surface area, and volume changes during the redox reactions, still, need to be addressed. These issues could be resolved by: (i) combining highly conductive material with the metal oxides, (ii) designing and fabricating novel electrode structures, and (iii) growing the active material directly on a highly conductive substrate.…”

Structural, optical and electrical properties of Cu:MnO2 nanostructured thin films for glucose sensitivity measurements

“…A good number of research work have been done on the synthesis and characterization of Al, Ag, Co, and Cr, etc. doped MnO 2 thin films [7][8][9][10]. Supplementary to these metals, Cu has a great deal of diligence dopant because of its low cost, good electrical conductivity, non-toxicity and environmentally friendly nature [11].…”