Ceramics-Silikáty

Carbon cement supercapacitors (CCS) have attracted considerable attention for renewable energy applications due to their high energy storage capacity and fast charge-discharge kinetics. CCS was prepared at w/c of 0.35 and 0.40, with conductive carbon black (CCB) dosages ranging from 0 to 1.50 wt.% relative to the mass of cement. The effects of composition on workability, compressive strength, LF-NMR-derived pore characteristics, phase evolution, and preliminary electrochemical response were investigated. At a w/c of 0.35, increasing the CCB dosage from 0 to 1.50 wt.% reduced the paste flowability from 178 to 90 mm. For specimens containing 0.25-1.25 wt.% CCB, the LF-NMR-derived total porosity decreased from 33.60 % to 24.93 %, while the value for the specimen containing 1.00 wt.% CCB was 26.30 %. The electrochemical curves showed composition-dependent increases in current response and charge–discharge duration, whereas the impedance response did not exhibit a simple monotonic relationship with CCB dosage. Within the w/c = 0.35 series, a CCB dosage of 1.00-1.25 wt.% was identified as a candidate composition range rather than a unique optimum. These results constituted laboratory-scale evidence of material performance; further validation of full-device performance, durability, and coupled mechanical-electrochemical behavior was required before structural applications could be considered.