Fabrication of uniform MnO2 layer-modified activated carbon cloth for high-performance flexible quasi-solid-state asymmetric supercapacitor

High Yield and High Volumetric Capacitance Activated Carbons by One‐step Homogeneous Activation of Diaphragma Juglandis Fructus for Supercapacitors

“…The CV and GCD curves of the QSSC are shown in Figure 5a and b, giving rise to a specific cell capacitance of 42.3 F g −1 at 0.5 A g −1 , corresponding to 169 F g −1 for a single electrode. Hence, the areal capacitance of AC‐1 in QSSC was 637 mF cm −2 , which was much higher than 14.5 mF cm −2 for carbon nanotubes in PVA/H 3 PO 4 gel electrolyte, [16] higher than 423.7 mF cm −2 for MnO 2 on activated carbon cloth in PVA/LiCl gel electrolyte, [17] comparable to 684 mF cm −2 for tailored tubular carbon in the PVA/Na 2 SO 4 gel electrolyte [18] . Three QSSCs were connected in series, achieving a cell voltage of 3 V which could illuminate an LED (Figure 5c and d).…”

Insight of super-capacitive properties of flexible gel polymer electrolyte containing butyl imidazole ionic liquids with different anions based on PVDF-HFP

“…Consequently, charge and discharge studies with a maximum voltage of 2.0 V were performed on the device, as described in the previous section, and this was also noted in the CV study. At the same time, in conjunction with the exploration of the optimal discharge voltage for the three groups of devices [43], it was observed that a clear deviation occurs when the voltage is increased beyond 2 V, which can further explain the instability of cell-2. These devices such as cell-1, cell-2, and cell-3 are subjected to charging and discharging processes at room temperature, employing constant current rates of 0.5, 1.0, 2.0, 3.0, 4.0, and 5.0 A g − 1 within the voltage range of 0 to 2.0 V., as shown in Fig.…”

Advanced MnOx/MnWO4 hetero-nanoflakes with abundant oxygen vacancies for high-performance flexible asymmetric supercapacitors with high energy density

“…[10][11][12][13] However, a majority of the as-developed MnO 2 -based flexible supercapacitors still suffer from low energy density and capacitance retention owing to their poor electrical conductivity and low electrode utilization ratio. [14][15][16] To achieve the high performance of MnO 2 -based supercapacitors, many efforts have been made. Recent studies have shown that integrating oxygen vacancies with metal oxides can regulate the electronic structure and accelerate electron transfer, contributing to high electronic conductivity, structural stability and electrochemical performances.…”

“…10–13 However, a majority of the as-developed MnO 2 -based flexible supercapacitors still suffer from low energy density and capacitance retention owing to their poor electrical conductivity and low electrode utilization ratio. 14–16…”