Manganese oxides derived from Mn(II)-based metal–organic framework as supercapacitor electrode materials

Manganese oxides have been received increasing interest due to their potential application in supercapacitor electrode material. In this paper, a new metal–organic framework Mn₃(MA)(H₂O)₂(ipa)₃ (1) (H₂ipa = isophthalic acid; MA = melamine) was synthesized via hydrothermal reaction; it presents a 3D network structure which can be simplified as an unusual non-interpenetrated pseudo-primitive 6-connected cubic topology. The Mn-MOF was regarded as a precursor to prepare variety of manganese oxides via calcination in different environments. Cyclic voltammetry and galvanostatic charge–discharge measurements were employed to characterize the electrochemical performance of MnO _X materials in Na₂SO₄ electrolyte. The results show that the MnO _X materials reveal excellent long-term cycling stability with enhanced capacitance after charge–discharge cycles. The optimum specific capacitance can be 150 F g⁻¹ with a current density of 1.0 A g⁻¹.