Electrochemical synthesis of flower like Mn-Co mixed metal oxides as electrode material for supercapacitor application

High-performance asymmetric supercapacitor based on a CdCO3/CdO/Co3O4 composite supported on Ni foam – part II: a three-electrode electrochemical study

“…1,2,4,5,7,9–11 Supercapacitors are widely used in hybrid electric vehicles, portable electronic devices, medical and telecommunication devices. 8,12–14 On the basis of charge storage mechanism, SCs can be categorized into two groups: electric double layer capacitors, which use electrostatic accumulation of electrolyte ion to store energy and pseudocapacitors, which store energy by faradaic reactions. 2,11,13…”

“…8,12–14 On the basis of charge storage mechanism, SCs can be categorized into two groups: electric double layer capacitors, which use electrostatic accumulation of electrolyte ion to store energy and pseudocapacitors, which store energy by faradaic reactions. 2,11,13…”

“…9,12,27 Among them, Co 3 O 4 is seen as promising candidate owing to its: low-cost, easy synthesis, environmental friendly nature, excellent pseudo-capacitive properties (exhibiting large number of faradaic reactions among Co 2+ /Co 3+ and Co 3+ /Co 4+ , 12 high specific capacitance (theoretical capacitance of ∼3562 F g −1 ), structure, morphology, large surface area and electrochemical applications. 13,27–33 However, its low electrical conductivity, low electrochemical reversibility and low cycle life largely decrease its practical capacity and rate performance, and then power and energy densities are far from commercial requirements. 12,24,28 Reported values of observed specific capacitances for various Co 3 O 4 SC electrode materials are well and exhaustively reviewed by Lee et al , 2 with ultrahigh specific capacitance values up to 2735 F g −1 for mesoporous Co 3 O 4 nanosheet arrays on Ni foam electrochemical supercapacitor.…”

“…10,24,28 Therefore, in order to address this problem, several approaches have been reported to enhance the electronic conductivity of the SC electrode material, i.e. : binder-free electrode design and nanostructured current collector design to provide efficient electron pathways for charge transport, 10 synergistic effects of multiple-phase metal oxides leading to a higher electronic conductivity than those of monometallic oxides 13,27,28 and combining the active material with carbonaceous materials (or other conductive material), to enhance the electronic conductivity. 30,31,35…”

Mixed Metal Oxide by Calcination of Layered Double Hydroxide: Parameters Affecting Specific Surface Area

“…In the technical point of view, they can be prepared to have wide variety of composition, crystallinity, particle size, etc. In other word, their electronic structure, surface chemistry, and the degree of unsaturated coordination bonds could be intentionally controlled for the industrially beneficial properties such as adjusted adsorption property and catalytic activity [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. For example, MMOs can be prepared with various metal composition, normally as Mg-Al, Mg-Fe, Zn-Al, etc.…”