Multidimensional woodchips-like Mn-metal-organic framework for asymmetric supercapacitor devices

Abstract

Multidimensional manganese-metal organic frameworks (Mn-MOF) are synthesized using 1,2,4,5-Benzene tetracarboxylic acid (BTTC) at various temperatures (100–160 °C). The Fourier-transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) techniques successfully confirm the formation of Mn-MOF. Among the various temperatures, the Mn-MOF synthesized at 140 °C (Mn-MOF@BTTC-140) is remarkable because it has excellent crystallinity and a unique morphology, i.e., woodchips-like structure. The synthesized Mn-MOF@BTTC materials are used in supercapacitor applications. In comparison to all materials, Mn-MOF@BTTC-140 revealed the maximum specific capacitance (Cs) of 627 F g-1 @ 1 A g-1, and it displayed 91 % capacitance retention even after the 6000 cycles at a current density of 10 A g-1. Furthermore, the supercapacitor device (SD) constructed using carbon nanofibers (CNF) as the negative electrode and Mn-MOF@BTTC-140 as the positive electrode delivered an energy density of 25 W h kg-1 at a power density of 532 W kg-1. Ultimately, LED lighting demonstrates that our fabricated materials suit practical applications.

Keywords

• Mn-metal organic frameworks
• 1,2,4,5-benzene tetracarboxylic acid
• Mn-MOF@BTTC
• Supercapacitor
• Energy density
• Power density