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This paper presents the preparation of  in situ  electrodeposited rGO/MnO 2  nanocomposite as a binder-free electrode for supercapacitor application. The work describes and evaluates the performance of prepared electrode via green and facile electrodeposition technique of  in situ  rGO/MnO 2 -glucose carbon nanocomposites. The carbon content in the composite electrode increased after GO and D (+) glucose solution has been added in the deposition electrolyte. This study found that a suitable concentration of D (+) glucose in the deposition electrolyte can slow down the nucleation process of MnO 2  particles and lead to uniform and ultrathin nanoflakes structure. The optimize electrode exhibited low transfer resistance and resulted on excellent electrochemical performance in three electrolyte systems viz. Na 2 SO 4 , KOH and KOH/K 3 Fe(CN) 6  redox electrolytes. The optimum energy density and power density were 1851 Whkg  − 1  and 68 kWkg  − 1  at current density of 20 Ag  − 1  in mixed KOH/K 3 Fe(CN) 6  electrolyte.

Green synthesis of in situ electrodeposited rGO/MnO2 nanocomposite for high energy density supercapacitors