Inkjet printing porous graphene/silver flexible electrode with enhanced electrochemical performance based on vapor phase reduction

Abstract

In this work, inkjet printing of porous graphene/silver composite with low temperature vapor phase reduction was studied. Silver precursor and graphene oxide (GO) with a low weight ratio were used as ink for inkjet printing into a film. After vapor phase reduction, the inserted silver nanoparticles between reduced graphene oxide (RGO) layers acted as physical separators to prevent agglomeration of the RGO and reduce the Van Der Waals force between graphene sheets. The fabricated RGO/Ag electrode presented a high electrical conductivity of 2.9 × 105 S/m, and could keep stable after multiple bending. Meanwhile, the reducing agent vapor entered the interior of the RGO during the vapor reducing process, which generated porous channels in the RGO/Ag electrode. The porous channels could facilitate the penetration of the electrolyte into the graphene/silver electrode, resulting in a good electrochemical performance with a specific capacitance of 60.6 mF/cm2 at a scan rate of 5 mV/s, which greatly improves the property compared with the previous reports.