We evaluated three biomass-derived (garlic roots/skin/powder) and three commercially available carbons from different sources (bitumen coal, carbide, and coke) as electrode materials for supercapacitive swing adsorption (SSA). Galvanostatic charging and discharging coupled with SSA adsorption measurements showed that higher capacitance not only led to up to four times higher gravimetric adsorption capacities but also accelerated the adsorption rates and improved productivity. There is a positive correlation between specific capacitance and sorption capacity, arguing that the development of electrode materials with increased specific capacitance is a pathway to improve the sorption capacity. A quantitative overview over the relationships between capacitance and adsorption capacity shows that GR-AC (gravimetrically) and GP-AC (volumetrically) show the best CO2 adsorption capacities among the tested electrodes. GR and GS are abundantly available biomass waste and can be used economically for activated carbon synthesis. The positive correlation between capacitance and adsorption capacity suggests that the ionic-liquid solid mechanism plays an important role in CO2 adsorption and desorption. Scaling of electrodes resulted in improved purity of the effluent gas but requires further optimization to avoid scaling effects that influence adsorptive and energetic performance metrics. The techno-economic analysis shows that the improvements presented herein substantially increase the practical potential for SSA as carbon capture technique from a cost perspective.