Preventing Graphene from Restacking <i>via</i> Bioinspired Chemical Inserts: Toward a Superior 2D Micro-supercapacitor Electrode

Graphene-based composites are promising materials for supercapacitors due to the high specific surface area and electrical conductivity of graphene. Reduction graphene oxide (GO) is a practical approach obtain graphene-like material, but it suffers from restacking sheets. Herein, two-dimensional composite electrode based on electrochemically reduced GO (ERGO) polydopamine (PDA) reported, where PDA used as “bioinspired chemical insert” tackle with issue layers. This green facile electrochemical fabrication method starts electroreduction followed by electro-oxidation dopamine (DA), present in same electrolyte, simple switch between cathodic an anodic potential. The optimized ERGO-PDA possesses combined features excellent capacitive behavior, relaxation time (τ0) 0.88 s, gravimetric volumetric capacitances (178 F·g–1 297 F·cm–3, respectively, at 10 mV·s–1), finally cycling stability 100–2000 mV·s–1 least 30,000 cycles. DA electropolymerization yield monitored quartz crystal microbalance X-ray diffraction measurements demonstrate that formed sheets which prevents facilitates species diffusion inside composite, leading energy density 8.6 mWh·cm–3 power 7.8 W·cm–3. Additionally, demonstrates dominant cationic charge compensation very efficient interfacial transfer characteristic since totally reversible mass response during charge/discharge was observed electrode.