Electrochemical Features of Symmetric and Asymmetric Supercapacitors Based on Nanostructured Mn-Cuo Electrodes

Abstract

Progress in material science has unearthed a number of options that offer great advantages for nanostructured electrode materials which enable supercapacitors to operate efficiently. Present work involves fabrication of symmetric and asymmetric type supercapacitor devices utilizing Mn-CuO nanostructures and activated carbon (AC) as electrode materials and subsequent investigation on their supercapacitive performance in 2M KOH aqueous electrolyte. The asymmetric supercapacitor device (Mn-CuO // 2M KOH// AC) demonstrate a specific capacitance of 72 Fg-1 at a current density of 0.5 Ag-1. The cyclic stability test of this device performed at a current density of 10 Ag-1 reveals a capacitance retention of 71% of its initial value over 300 charge-discharge cycles. In addition, this device exhibits an energy density of 7.4 Whkg-1 and a power density of 127 Wkg-1.

Spray Synthesized Mn‐doped CuO Electrodes for High Performance Supercapacitor

“…[2,8] The literature review compared with present work is shown in Table 1. [2,9,[12][13][14][15][16][17][18] Furthermore, the specific capacitance performance for C 1 , MC 2 , MC 4 , and MC 6 electrodes is shown in Table 2.…”

“…The FESEM of higher magnifications of MC 6 added in supporting information (S 1 ). From the literature survey, it is found that electrochemical properties of electrode material are highly dependent on surface morphology [2,13,23,32] …”

“…It is noteworthy to mention MC 6 electrode showed a high specific capacitance of 801.61 F/g at 10 mV/s. This implies that the presence of Mn and high conductivity CuO material can improve specific capacitance of MC 6 [10] and broken surface morphology of MC 6 may enhance the specific capacitance of material [2,13,22,23] . The MC 6 electrode exhibited enhanced specific capacitance values about four times that of C 1 film.…”

Superior energy‐power performance of N‐doped carbon nano‐onions‐based asymmetric and symmetric supercapacitor devices

“…It is well‐known that, compared to the symmetric supercapacitors, the asymmetric supercapacitor devices have the advantage of higher energy and power density due to the non‐identical potential changes in the two dissimilar electrodes that provide longer discharge times and non‐identical discharge profiles resulting in higher energy and power performances 63 . However, a big issue lies in the charge balancing of the two electrodes 64 .…”

“…It is well-known that, compared to the symmetric supercapacitors, the asymmetric supercapacitor devices have the advantage of higher energy and power density due to the non-identical potential changes in the two dissimilar electrodes that provide longer discharge times and nonidentical discharge profiles resulting in higher energy and power performances. 63 However, a big issue lies in the charge balancing of the two electrodes. 64 Therefore, the supercapacitive performance of the active electrode (N-CNO) within a device, an N-CNO//N-CNO symmetric supercapacitive device is fabricated for better understanding, and corresponding device performance is compared with the asymmetric device presented above.…”