Effect of Fe doping on the electrochemical capacitor behavior of MnO2 nanocrystals

The effects of Fe-doping on MnO2: phase transitions, defect structures and its influence on electrical properties

“…In order to enhance the properties, up until now, various synthesis methods have been developed, namely sol–gel, 10 co-precipitation, 11 electrodeposition, 12 and hydrothermal reaction. 13 These various methods are able to reduce the crystal size, enlarge the surface area for the enhancement of the ion diffusion rate 8 and finally improve the supercapacitive performance of MnO 2 .…”

Electrochemical Deposition Enables Freestanding CoNi Layered Double Hydroxide/MnOX Electrode with Enhanced Electrochemical Properties for Asymmetric Supercapacitors

“…The X-ray diffraction (XRD) patterns of MnO X and CoNi LDH/MnO X nanomaterials in Figure 3a,b are almost the same, and the XRD pattern of MnO X shows a strong diffraction peak at 2θ ¼ 37.20, corresponding to the (211) faces of MnO X (JCPDS, card number 44-0141). [23] In addition, it can be seen that few peaks are difficult to specify as a certain crystal form, which indicates that MnO X is a mixture oxide and amorphous structure. Also, the peaks at 2θ values of 11.5 and 62.6 respond to CoNi-LDH (PDF, card number 38-0715), respectively.…”

Phase-dependent electrochemistry of TiO2 nanocrystals for supercapacitor applications

“…As observed in the figure, the CV curves of TiO 2 -A and TiO 2 -C reveal a couple of redox peaks, whereas the electrode of TiO 2 -R has a rectangular shape without any redox peaks. The presence of redox peaks suggests that the capacitive reactions are due to a reversible faradic process and indicate their pseudocapacitance behaviour [31]. The origin of the redox peaks can be rationalized by the fact that the insertion/exertion of alkali cations into/out of the electrode occurs with an associated reduction/oxidation of the Ti ions [20].…”