Fabrication of novel hybrid composite La_2-xCo_xCuO₄electrode for high performance supercapacitors

Abstract

Summary Hybrid composites La2‐xCoxCuO4 (x = 0, 0.1, 0.2, and 0.3) are prepared using one‐step simple hydrothermal route as electrodes for supercapacitors. The effect of varying cobalt content on morphological, structural, and electrochemical properties has been explored using X‐ray diffraction, scanning electron microscopy, and cyclic voltammetry, respectively. The structural parameters obtained by X‐ray diffraction showed tetragonal phase of hybrid composite without any evident impurity phases. The analysis of morphological properties suggested a strong correlation with electrochemical properties, for instance, a relationship between fabric porous structures and electrochemically active sites for redox reactions and intercalation/de‐intercalation processes. The hybrid composite electrodes demonstrated high specific capacitance of the order of 1304 F/g at 10 mV/s scan rate and exhibited decreasing trend on increasing scan rate. Hybrid composites were also tested for their ability as an electrode of high performance supercapacitors in different aqueous electrolytes, i. e, KOH, H2SO4, and Na2SO4 to optimize the best compatible electrolyte. The composite electrode material showed excellent cyclic stability and 98% capacitance retention for 1 A/g after 2000 cycles. The remarkable performance of hybrid composite electrode entails its potential for commercial applications of supercapacitors.

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

“…Generally, SCs are divided into two categories; one, referred to as electric double‐layer capacitors (EDLCs), is based on the accumulation of electrolyte ions near the surface of electrode materials in the form of electrical double layer (EDL), and the other one, referred to as pseudo‐capacitor, involves “reversible” Faradic reaction and is mainly based on either metal oxides or conductive polymers . Recently, there has been great interest in pseudo‐capacitors due to their relatively higher Faradic capacitances than EDLCs .…”

“…Supercapacitors (SCs), possessing outstanding performance of high power, fast charge/ discharge rates, and long-term stability, 1-3 have potential applications in electronics, electric vehicles, etc, which need high-power pulses. [4][5][6][7] Generally, SCs are divided into two categories; one, referred to as electric double-layer capacitors (EDLCs), is based on the accumulation of electrolyte ions near the surface of electrode materials in the form of electrical double layer (EDL), 8,9 and the other one, referred to as pseudocapacitor, involves "reversible" Faradic reaction 10 and is mainly based on either metal oxides [11][12][13] or conductive polymers. [14][15][16][17][18] Recently, there has been great interest in pseudo-capacitors due to their relatively higher Faradic capacitances than EDLCs.…”

Synthesis of porous flower‐like Ni‐Co‐Mo‐S nanostructures on Ni foam for battery‐supercapacitor hybrid devices

“…Recently, binary transition metal oxides/hydroxides have been considered as the most attractive battery‐type electrode materials . Among them, the electrochemical behaviors of Ni‐Co oxides/hydroxides have attracted extensive attention due to their low cost, environmental friendliness, and excellent redox properties .…”

“…Recently, binary transition metal oxides/hydroxides electrode materials. [19][20][21][22] Among them, the electrochemical behaviors of Ni-Co oxides/hydroxides have attracted extensive attention due to their low cost, environmental friendliness, and excellent redox properties. 23,24 However, their relatively poor conductivity resulted in low capacity and unsatisfactory cycle stability.…”

Hydrogen ion supercapacitor cell construction and rational design of cell structure

“…Supercapacitors and secondary cells are regarded as promising candidates for energy storage and conversion devices. Interesting results have already been published for supercapacitors, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] lithiumion secondary batteries, [16][17][18][19][20][21] and sodium-ion secondary batteries. 22 Hybrid supercapacitors, however, merge the boundary between the supercapacitors and secondary batteries and possess several advantages over them, including high energy density, high power density, fast charge and discharge speed, and long cycle life.…”