Investigation on microstructure and improved supercapacitive performance of Mn doped CuO thin films prepared by reactive radio frequency magnetron sputtering

Electrochemical performances of activated carbon prepared using eggshell waste

“…The average crystallite size of both ground cum heated samples and activated samples were calculated using Scherrer formula [19] given by…”

Microstructural and electrochemical supercapacitive properties of Cr‐doped CuO thin films: Effect of substrate temperature

“…From the CV investigations, the maximum areal capacitances obtained are 38 mF cm À2 for undoped CuO prepared at 373 K, 59 mF cm À2 for Cr-doped CuO prepared at 373 K, 101 mF cm À2 for Cr-doped CuO prepared at 473 K, 209 mF cm À2 for Cr-doped CuO prepared at 573 K, and 111 mF cm À2 for Cr-doped CuO prepared at 673 K at the scan rate of 10 mV s À1 . It is noted that the Cr-doped CuO film electrode fabricated at 573 K shows the best electrochemical performance with the highest areal capacitance of 209 mF cm À2 compared with the other thin-film electrodes such as Mn-doped CuO (81 mF cm À2 at 10 mV s À1 ), 28 CuO (30 mF cm À2 at 5 mV s À1 ), 49 MnO x (110 mF cm À2 at 5 mV s À1 ), 50 V 2 O 5 /graphene (22.4 at 0.7 A m À2 ), 51 and TiO 2 @MnO 2 (22 mF cm À2 at 5 mV s À1 . 52 Figure 7F shows a decreasing trend in the areal capacitance with increasing scan rates, which might be due to inadequate time for exchange of ions among electrolyte and interface of electrode during the electrochemical reactions.…”

“…In this regard, various combination of materials such as carbon fiber fabrics, 21 graphene, 22 polyaniline, 23 ZnO, 24 polyacrylic acid, 25 crown ethers, 26 etc., with CuO have been examined for enhanced supercapacitive properties. Likewise, the metal doping such as Ag-doped CuO, 27 Mn-doped CuO, 28 and Ru-doped CuO 29 also increases the electrochemical properties as well as cycling stability of the supercapacitors. Although the metal-doped CuO has considerable importance in supercapacitors, so far only a few works have been reported, and there is no systematic study of metaldoped CuO till now, especially on nano-structured Crdoped thin films as a function of substrate temperature.…”

3D nanorhombus nickel nitride as stable and cost-effective counter electrodes for dye-sensitized solar cells and supercapacitor applications

“…The average crystallite size, dislocation density and lattice strain were calculated according to previous reports. 38,39 The crystallite size of Ni 3 N was calculated from (002) reections and the obtained crystallite size of the Ni 3 N thin lm is about 28.73 nm, the dislocation density (d) is 1.2115 Â 10 15 lines per m 2 and the calculated lattice strain (3) is 0.003401.…”