Flower-like MnNi2O4-MnNi2S4 core@shell composite electrode as battery-type supercapacitors

Construction of Ti3C2Tx MXene wrapped urchin-like CuCo2S4 microspheres for high-performance asymmetric supercapacitors

“…When its voltage window is increased to 1.7 V, a sharp anodic peak was observed in the CV curve, indicating the existence of a polarization phenomenon. 47 Therefore, the suitable potential window of the CuCo 2 S 4 /MXene//AC is 0 V–1.6 V. Fig. 4d reveals the CV curves of the fabricated CuCo 2 S 4 /MXene//AC at different sweep rates from 10 mV s −1 to 50 mV s −1 .…”

“…To determine the optimal operating voltage of the fabricated CuCo 2 S 4 /MXene//AC device, the CV curves were analyzed at different voltage windows ranging from 0-1.5 V to 0-1.7 V, as shown in Fig.4c. When its voltage window is increased to 1.7 V, a sharp anodic peak was observed in the CV curve, indicating the existence of a polarization phenomenon 47. Therefore, the suitable potential window of the CuCo 2 S 4 /MXene//AC is 0 V-1.6 V. Fig.4dreveals the CV curves of the fabricated CuCo 2 S 4 /MXene//AC at different sweep rates from 10 mV s −1 to 50 mV s −1 .…”

Transition Metals Co, Ni, Mn Based Bimetallic Sulfides as an Efficient Electrocatalyst for Hydrogen Evolution Using Graphite Counter Electrode Extracted from Spent Battery

“…For example, MnNi 2 O 4 -MnNi 2 S 4 composite showed better electrochemical activity, higher charge transfer property than the MnNi 2 O 4 . 31 Also, comparing to transition metal oxides, the sulfides show good electrical conductivity due to the lower energy gap between the metal and 3p 6 level of S compared to 2p 6 level of O 6 Hence, the observed overpotential of Ni-Mn-S is higher compared to Co-Mn-S. It is worthy to note that the XRD plot of the Ni-Mn-S confirms the presence of the impurity phase MnNi 2 O 4 along with NiS and MnS.…”

Fabrication of polypyrrole conductive matrix covered MnNi2O4 nanocomposite as a positive electrode material for asymmetric supercapacitor applications

“…As shown in Fig.4B, two peaks 641.8 and 654.1 eV correspond to 2p 3/2 and 2p 1/2 states of Mn, respectively. Furthermore, the Mn 2p 3/2 peak was fitted into three peaks at 637.3 eV, 641.5 eV, and 644.0 eV, related to Mn 2+ , Mn 3+ , and Mn 4+ , respectively 31. In Ni 2p (Fig.4C), two firm peaks were observed at 855.1 eV and 872.8 eV, attributed to the 2p 3/2 and 2p 1/2 states of Ni (Ni 3+ and Ni 2+ ), respectively.…”