Investigations Ce Doped MnO2/rGO as High Performance Supercapacitors Material

The novel Ce doped MnO2/rGO composite was fabricated by a simple two-step hydrothermal method reacted for different times. As results, the composite reacted for 1h exhibits better electrochemical performance and rate capacity, the capacitive retention is 85% from 130.44 F g(-1) for first cycle decrease to 111.11 F g(-1) after 1000 cycles at the current density of 1 A g(-1), and 14.7 W h kg(-1) of energy density. Moreover, the BET surface area is 243 m(2) g(-1), and the average pore size is 7.9 nm, which will be convenient for the quick transport and migration of electrolyte ions during the charge-discharge process, and further confirm good rate capability.