Self-assembled spongy-like MnO2 electrode materials for supercapacitors

Structural Directed Growth of Ultrathin Parallel Birnessite on β-MnO2 for High-Performance Asymmetric Supercapacitors

“…The broad peak in the range of 450 to 650 cm –1 was ascribed to the Mn–O vibrations of manganese oxides. Additionally, the bands at approximately 1116 cm –1 correspond to the coordination of Mn–O–H. , The weak band at 1638 cm –1 is probably due to bending vibrations of the O–H groups in adsorbed water molecules, while the broad band at approximately 3448 cm –1 represents the O–H stretching of interlayer water molecules, indicating the presence of a large amount of water, in agreement with the XRD results. Although all the results demonstrate the existence of birnessite, no standard powder diffraction pattern from the literature matches with that of the birnessite we obtained, which can be ascribed to the different interlayer spacing and the horizontal and vertical skewing of the slab.…”

Merging of Kirkendall Growth and Ostwald Ripening: CuO@MnO2 Core-shell Architectures for Asymmetric Supercapacitors

“…The second weight loss (~2%) in between 550 and 700°C can be attributed to the loss of oxygen in MnO 2 lattice, i.e. reduction of MnO 2 to Mn 2 O 3 42 56 57 , consistent with the sharp peak in the DSC curve.…”

Rational design of coaxial mesoporous birnessite manganese dioxide/amorphous-carbon nanotubes arrays for advanced asymmetric supercapacitors

“…SI-3). A loss of about 1.5% after 500 C will be the loss of oxygen in MnO 2 lattice, i.e., reduction of MnO 2 to Mn 2 O 3 [29,30], consistent with the decline tendency in the DSC curve. The thin MnO 2 walls and high MnO 2 content of SM-Outer can be a good electrochemical behavior of these materials.…”