▎ 摘　　要

The hybrid electrodes MnAP@GQD(x) are synthesized through microwave route for four graphene quantum dots (GQD) variates (x = 25, 50, 75, and 100 mg). The Debye-Scherrer calculations show lower crystallite size for MnAP at 75 mg GQD. In Raman studies, among all GQD variates the 75 mg GQD doped MnAP composite reveal higher I-D/I-G ratio (1.03). The electrochemical performance shows higher specific capacitance 596 Fg(-1) at 1 Ag-1 for it. Thus, XRD, Raman, and CV studies identified 75 mg GQD as the appropriate mass dispersoid for MnAP lattice. This optimized MnAP at 75 mg GQD has been subjected to scanning electron microscopy (SEM), transmission electron microscopy (TEM), brunauer-emmet-teller (BET), and X-ray Photoelectron Spectroscopy (XPS). The SEM shows broken rectangular micro platelets for MnAP, and its disintegration after doping GQDx=75mg shows strong complexation. The BET study reveals mesoporosity (3 nm) favoring for better ionic transport, and the XPS accounts for the oxidation states. In full-cell, MnAP@GQDx=75mg as a positrode // rGO negatrode, has shown 442 Fg(-1) at 1 Ag-1 in 3M H2SO4 at 0-1.8 V. Further enhancement 693 Fg(-1) in it, is achieved by dispersing dual redox additives 0.025M (KI/VOSO4) in 3M H2SO4 with 311 Wh kg(-1)/450 W kg(-1) at 1 Ag-1 and having the capacity retention 82% for 5000 cycles at 20 Ag-1. Thus, increase in specific capacitance for this optimized electrode is observed for dual redox additives in 3M H2SO4 suggestive for high-performance supercapattery applications.