Capacitance capacity of biochar-incorporated cementitious composite

Abstract

The utilization of cement-based materials in producing capacitors has attracted wide attention. Waste biochar remaining from the pyrolysis of biomass is a porous and highly conductive material, which has good potential in the preparation of capacitors. The research found that incorporating biochar into cement composites significantly enhanced their electrical properties due to its porosity and conductivity. As the amount of biochar increased, capacitance initially rose before declining, peaking at seven days of 56.1 μF with a notable increase of 80.38 % over non-biochar composites. This improvement was attributed to the formation of a conductive network within the composite matrix facilitated by biochar's porous structure. Hydration ratio initially increased and then decreased with increasing biochar content. The micro and meso porosity of the composites increased with biochar content. Overall, this study underscores the potential of utilizing biochar as a valuable additive in the development of cement-based capacitor electrodes.