Nitrogen-doped carbon spheres-decorated graphite felt as a high-performance electrode for Fe based redox flow batteries

In this paper, the performance of Fe-based redox flow batteries (IRFBs) was dramatically improved by coating N-doped carbon spheres (NDCS) on graphite felt electrodes. NDCS synthesized single-step hydrothermal method using dextrose and ammonia as a precursor coated over electrodes electrostatic spraying. The weight required for modification electrode to achieve effective battery studied electrochemical techniques. Cyclic voltammetry (CV) potentiodynamic polarization study used evaluate kinetic reversibility linear resistance offered towards electrolyte. characterizing features NDCS, untreated (UGF) optimized modified (MGF) were analyzed SEM, EDAX, XRD, Raman spectroscopy. charge-discharge studies performed 132 cm2 IRFB 2 mg/cm2 MGF positive varying current densities from 20 60 mA/cm2. cell resulted in an average coulombic efficiency (CE) 93%, voltaic (VE) 72%, energy (EE) 68% 15 cycles at density 30 improvement is due presence electrochemically active nitrogen-bearing catalysts. pioneering effort has been made improve with area glycine ligand.