Supercapacitor system grafted polyelectrolytes has important application value to improve its performance,such as reducing contact resistance and increasing capacitance.In this work,the charge dynamics of 3 nm nanopore with grafted end charged polyelectrolytes were studied by solving a continuity equations including hydrodynamic model.It is found that although polyelectrolytes increase the charge storage,the shorter polyelectrolytes decrease the strength of convection of the electrolyte in the nanopore,thus reducing the power of supercapacitors.This is because the chain length and surface charge density of polyelectrolytes will change the distribution position and quantity of counter ions,thus changing the position and magnitude of the driving force of electrolyte convection in the nanopore.In addition,the effect of electrolyte convection on charge storage mechanism is also studied.It was found that the convection at the center of the nanopore,enhanced the co-ion desorption,and promoted the charge storage mechanism to change from dominated by counter-ion adsorption to dominated by ion exchange.
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