Preparation and electrochemistry of nanostructured PPy/graphite nanosheets/rare earth ions composites for supercapacitor

Highly conductive PPy/graphite nanosheets/rare earth ions (PPy/nanoG/RE 3+ ) composites were prepared via in‐situ polymerization with p‐toluenesulfonic acid as a dopant and FeCl 3 as an oxidant. The microstructures of nanoG and PPy/nanoG/RE 3+ were characterized by the SEM and TEM examinations. It was found that nanoG and PPy nanospheres formed the uniform composite with the PPy nanospheres embedded on the nanoG surface and/or filled between the nanoG. The effects of nanoG and RE 3+ on the electrical conductivity and electrochemical performance of the composites were investigated. The results showed that the nanoG and RE 3+ as the filler had effect on the conductivity and electrochemical performance of PPy/nanoG/RE 3+ composites, which played an important role in forming a conducting network in PPy matrix. A specific capacitance of as high as 175 F/g at a current density of 1 A/g was achieved over the PPy/nanoG/Gd 3+ composite. The capacitance of the PPy/nanoG/Gd 3+ composite decreased only 5.1% after 800 charging/discharging cycles at a current density of 1 A/g. POLYM. ENG. SCI., 54:2731–2738, 2014. © 2013 Society of Plastics Engineers