An efficient and green strategy for the synthesis of graphene with aqueous polyphenol extracts of orchid flower (Dendrobium Anosmum) for charge storage

Abstract

This study introduces the use of orchid flower extract as a green reducing agent for the first time to produce reduced graphene oxide (ORGO). Raman, XRD and FTIR confirmed the reduction process whereas TGA analysis provides the thermal stability of the prepared samples. SEM imaging validates the improved morphology of ORGO as compared to the crumpled and folded region of graphene oxide (GO). Electrochemical tests reveal ORGO’s superior specific capacitance (489.8F/g) value at scan rate of 20 mV/s, low charge transfer resistance (2.1 Ω) and high specific capacity retention (96.63 %) after 10,000 cycles, highlighting its potential application for charge storage devices.