Manganese oxide nanowires wrapped with nitrogen doped carbon layers for high performance supercapacitors

Engineering the Membrane/Electrode Interface To Improve the Performance of Solid-State Supercapacitors

“…Figure 6f also shows the CV curve of the same dried solid-state supercapacitor after then leaving it in air for 3 h. The CV curve recovered a more parallelogram shape, indicating charge/discharge kinetics were partly restored, even after the preceding severe drying cycle, which is not usually applied for solid-state supercapacitors. 55 The estimated recovered capacitance was 13.3 mF cm −2 per electrode at 350 mV s −1 . Therefore, the capacitance increased by 9 times by simply leaving the supercapacitor in air without packaging even after severe drying, offering encouraging potential in e.g.…”

“…Figure f shows a CV curve of the solid-state supercapacitor using [I] electrodes at 350 mV s –1 , after the whole supercapacitor was placed in a vacuum oven at 105 °C (within the stable Nafion and ionomer temperature range) for 3 h. The CV curve shows a highly elongated and compressed parallelogram, indicating little charge storage, with an estimated capacitance of only 1.5 mF cm –2 per electrode at 350 mV s –1 . Figure f also shows the CV curve of the same dried solid-state supercapacitor after then leaving it in air for 3 h. The CV curve recovered a more parallelogram shape, indicating charge/discharge kinetics were partly restored, even after the preceding severe drying cycle, which is not usually applied for solid-state supercapacitors . The estimated recovered capacitance was 13.3 mF cm –2 per electrode at 350 mV s –1 .…”

Soft-template-assisted synthesis: a promising approach for the fabrication of transition metal oxides

“…Different oxides of manganese synthesized with the aid of surfactants were reported with diverse morphologies for competent supercapacitor applications. 171,172,[176][177][178]180 NiO is also an important electrode material for supercapacitor applications. Zhang et al synthesized 2D NiO nanosheets with the aid of P123 to exhibit higher capacitance.…”

Ready-to-use binder-free Co(OH)2 plates@porous rGO layers/Ni foam electrode for high-performance supercapacitors

“…36,37 Also, in some studies, it has been reported that the metal hydroxide component is firstly prepared on the substrate and then the carbonaceous part is electrophoretically deposited as a top layer. 39–41 The electrophoretic deposition (EPD) route is a feasible and cost-effective technology that has been successfully used for GO precipitation due to its simple deposition procedure, thickness controllability, and simplicity of large scale production. 42,43 Electrochemical cathodic deposition (ECD) has also been used as a facile route for the preparation of metal hydroxide nanostructures.…”