Electrochemical Browsing of benzene-1,4-dicarboxylic acid Metal-Organic Framework linker based Manganese Phosphate @ in-situ reduced Graphene Oxide Hybrid Composite for High Energy Density Supercapacitors

Abstract

The facile microwave incubated hybrid composite benzene-1,4-dicarboxylic acid @ Metal-Organic Framework based Manganese Phosphate (MOFMnP) @ in-situ dispersoid reduced graphene oxide (rGO) has been synthesized. The X-Ray Diffraction on all composites confirms monoclinic phase and Debye Scherrer calculations reveal higher crystallinity for 50 mg rGO doped MOFMnPG (MOFMnPG2). The D and G band intensity ratio of Raman deconvolution confirms strong coordination of rGO with MOFMnPG2. The morphology draws its surface mapping as a crystalline cementation for MOFMnPG2. The Brunauer-Emmett-Teller analysis reveals that MOFMnPG2 has shown higher specific surface area (66.82 m²g^-1) with improved porosity. The Cyclic Voltammetry profile of MOFMnPG2 delivers higher current density within the potential window 0–1 V and the same is mirrored in Galvanostatic Charge Discharge (GCD) (1380 F g⁻¹ @ 1 A g⁻¹) with the maximum attribution of pseudocapacitance (77.7 %) albeit Electric Double Layer Capacitance (22.3 %). The MOFMnPG2//rGO full-cell device in 3M H₂SO₄ explored energy density 101 Wh kg⁻¹ and power density 450 W kg⁻¹ @ 1 A g⁻¹ with low equivalent series resistance and charge transfer resistance and its long cyclic stability of 89 % for 10000 GCD cycle @ 20 A g⁻¹ has identified MOFMnPG2 as an efficient positrode for Hybrid Supercapacitor applications.