Electrochemical properties of tricalcium aluminate hexahydrate − reduced graphene oxide nanocomposites for supercapacitor device

•The influence of rGO− C3AH6 cement nanocomposites on electrochemical properties.•The charge tranfering in C3AH6_rGO nanocomposites as describing by the band alignments model occurring between C3AH6 and rGO,.•The electrochemical properties of C3AH6_rGO electrodes displaying the storage charge mechanism of a hybridsupercapacitor behavior.•The highest value of 80.479 f g − 1 obtaining from C3AH6_rGO-20% at a current density of 0.2 a g − 1 with cycling stability of 96.51% after 1000 cycles.