Advanced hybrid supercapacitors assembled with high-performance porous MnCo2O4.5 nanosheets as battery-type cathode materials

Incorporation of α-MnO2 Nanoflowers into Zinc-Terephthalate Metal–Organic Frameworks for High-Performance Asymmetric Supercapacitors

“… 36 , 42 , 48 The XPS signal of O 1s of MZM ( Figure S1c ) was split into three peaks at 529.8 eV (O–C=O/Mn–O–Mn), 530.5 eV (Zn–O/Mn–O–H), and 532.1 eV (C=O), which are ascribed to the oxygen bonding with Zn and Mn metal clusters and also to the adsorbed water molecule on the surface both chemically and physically. 49 − 51 Further, it is obvious that all of the Zn 2p peaks ( Figure 4 b) and Mn 2p peaks ( Figure 4 c) of MZM shifted in the direction of increasing binding energies. This can be attributed to the interaction between Zn and Mn ions, moving the 2p peaks in the direction of the more positive binding energies.…”

“…The spin–orbit doublet peaks of Zn 2p were separated by a binding energy difference of 22.7 eV, which confirms the bivalent valence of the Zn ion. The XPS signal of O 1s of MnO 2 (Figure S1a) was split into three peaks at 530.5, 531.8, and 532.9 eV, and they were assigned to the Mn–O–Mn bond of the tetravalent metal oxide, Mn–OH bond, and to physically and chemically surface adsorbed water molecules, respectively. , The XPS signal of O 1s of ZM (Figure S1b) was split into three peaks at 529.5 eV (O–CO), 530.9 eV (Zn–O), and 532.3 eV (CO). ,, The XPS signal of O 1s of MZM (Figure S1c) was split into three peaks at 529.8 eV (O–CO/Mn–O–Mn), 530.5 eV (Zn–O/Mn–O–H), and 532.1 eV (CO), which are ascribed to the oxygen bonding with Zn and Mn metal clusters and also to the adsorbed water molecule on the surface both chemically and physically. − Further, it is obvious that all of the Zn 2p peaks (Figure b) and Mn 2p peaks (Figure c) of MZM shifted in the direction of increasing binding energies. This can be attributed to the interaction between Zn and Mn ions, moving the 2p peaks in the direction of the more positive binding energies …”

Synergy of Oxygen Vacancy and Surface Modulation Endows Hollow Hydrangea-like MnCo2O4.5 with Enhanced Capacitive Performance

“…Briefly, the high-frequency intercept on the real Z' axis represents the series resistance (Rs). In the middle-frequency region, the semicircle can be attributed to the charge transfer resistance (Rct) on the electrode surface [25,26]. The P-MnCoO electrode has a much smaller intercept and semicircle diameter than the H-MnCoO or MnCoO electrode, indicating a lower Rs and Rct of the P-MnCoO electrode, which is caused by Ov and phosphate-ion modulation.…”

Cycling Stability of a 2D Pristine MOF Supercapacitors

“…[3][4][5][6] Among which, SCs have attracted increasing attention in recent years in merits of their fast charge and discharge rates, long cycle life, high power density, low maintenance cost and so forth that traditional parallel plate capacitors can hardly reach. [7][8][9][10] Accordingly, SCs have been applied in military and industrial equipment, mobile electronic devices, uninterruptible power supplies and back-up power supplies. [11,12] However, their low energy density restricts largescale application of them in many fields.…”