Mo-doped ZnO nanoflakes on Ni-foam for asymmetric supercapacitor applications

Abstract

A single-step hydrothermal route for synthesizing molybdenum doped zinc oxide nanoflakes was employed to accomplish superior electrochemical characteristics, such as a specific capacitance of 2296 F g À1 at current density of 1 A g À1 and negligible loss in specific capacitance of 0.01025 F g À1 after each chargedischarge cycle (up to 8000 cycles). An assembled asymmetric supercapacitor (Mo:ZnO@NF//AC@NF) also exhibited a maximum energy density and power density of 39.06 W h/kg and 7425 W kg À1 , respectively. Furthermore, it demonstrated a specific capacitance of 123 F g À1 at 1 A g À1 and retained about 75.6% of its initial capacitance after 8000 cycles. These superior electrochemical characteristics indicate the potential of this supercapacitor for next-generation energy storage devices.

Organic template-assisted green synthesis of CoMoO4 nanomaterials for the investigation of energy storage properties

“…One key challenge of the present time is the increasing demand of energy storage devices to store renewable energies. [1][2][3][4][5][6] Among such storage systems, supercapacitors (SCs) are the candidates with the most potential owing to their high power density in energy storage devices. [5][6][7] The SCs can efficiently and sustainably fulll the demands of energy storage as compared to batteries, which are generally of low power density.…”

“…[1][2][3][4][5][6] Among such storage systems, supercapacitors (SCs) are the candidates with the most potential owing to their high power density in energy storage devices. [5][6][7] The SCs can efficiently and sustainably fulll the demands of energy storage as compared to batteries, which are generally of low power density. [7][8][9][10] SCs are of different types depending on the nature of the electrode material, 1,6,9,[15][16][17][18] and their performances are critically reliant on their electrode material.…”

Biomimetic Catalysts Based on Au@ZnO–Graphene Composites for the Generation of Hydrogen by Water Splitting

“…The characteristic peaks of wurtzite crystalline phase (ca. 32.0° (100), 34.8° (002), 36.0° (101), 47.5° (102), 56.2° (110), 62.8° (103), 66.0° (200), 67.5° (112), 68.8° (201)) were observed in all the catalysts [ 16 ]. In all cases, reflections at 38.2° and 44.4° were observed, which have been associated with Au (111) and (200), respectively [ 20 ], indicating that Au 3+ had been reduced to Au 0 , with the usual fcc structure.…”

“…The narrow strong band at ca. 437.0 cm −1 ( E 2 modes) is present in all the composites and it has been ascribed to motion of Zn in the wurtzite phase [ 16 ]. No gold bands were found for any of the composites.…”

“…Similar to titanium oxide, ZnO has also been demonstrated to be chemically stable, easy to produce, non-toxic, abundant, and environmentally-friendly [ 9 , 10 ], although unlike titanium dioxide, ZnO has been widely used for the degradation of organic pollutants and energy storage [ 14 , 15 , 16 ]. Some authors [ 17 , 18 ] consider that ZnO shows some disadvantages for the production of hydrogen by water splitting, especially the recombination of photogenerated electron–hole pairs, fast backward reaction, and the inability to use visible light.…”