Sculpturing the Core towards Mesoporous Manganese Dioxides Nanosheets-Built Nanotubes for Pseudocapacitance

One-pot synthesis of pearl-chain-like manganese dioxide-decorated titanium grids as advanced binder-free supercapacitors electrodes

“…HRTEM images (Fig. 4b and c) clearly show that the birnessite type MnO 2 nanostructures are crystallized with the interplanar distance of 0.36 and 0.72 nm, corresponding to the (006) and (003) plane of the birnessite-type MnO 2 , respectively [23,27], in agreement with the XRD results. Surprisingly, we found the pretreatment of Ti grid plays an important role to form such unique structure.…”

“…1 shows XRD pattern of the as-prepared pearl-chain-like MnO 2 nanostructure on Ti grid. Excluding the strong peaks from Ti grid, the diffraction peaks of MnO 2 nanostructure are observed of 12.3°and 24.8°, which could be assigned to (003) and (006) planes of the birnessite-type manganese oxide crystal (JCPDS 86-0666, a¼ 2.849 Å, c¼21.53 Å) [23,27]. No signal from other crystalline phases could be detected, indicating the high purity of the MnO 2 .…”

Construction of unique cupric oxide–manganese dioxide core–shell arrays on a copper grid for high-performance supercapacitors

“…24 The result indicates that the Cu grid is nitely oxidized under mild conditions, and the presence of copper ensures good conductivity for following use. 28 This result suggests that the samples are well synthesized without any other impurities. 72-0140).…”

Design and fabrication of hydrotalcite-like ternary NiMgAl layered double hydroxide nanosheets as battery-type electrodes for high-performance supercapacitors

“…35 The CV plots are employed to determine the electrochemical reaction kinetics. The current (I) is a function of sweep rates (v), and the corresponding equation can be described as follows: 36 I ¼ av b (6) wherein a and b are adjustable variables. If b is equal to 0.5, the redox reaction is controlled by the diffusion process; if b is equal to 1, the redox reaction is a surface-controlled process.…”

“…NiO, Ni(OH) 2 , Co 3 O 4 , Co(OH) 2 , MnO 2 , RuO 2 and their composites are commonly considered as promising electrode materials in supercapacitors because of their high capacitance as well as stable electrochemical properties. [6][7][8][9][10] However, the expensive cost of transition metal oxides/hydroxides materials hinders their large-scale practical application. Hence, developing novel materials with the merit of low cost and high performance becomes an urgent and challenging issue nowadays.…”