Structurally Controllable Hay-Slag-Based Porous Carbons for Supercapacitor and CO2 Adsorption Applications.

Biomass-derived porous carbon materials were selectively and controllably prepared by carbonization of hay slag (HS) and activation with ZnCl₂ combined with Mg(NO 3 ) 2 ⋅ 6 H₂O. The prepared porous carbon materials had an apparent multi-pore structure and a large specific surface area. In a 6 mol/L KOH with a current density of 0.25 A/g, the specific capacitance of the prepared sample was 220 F/g. Further study showed that the optimal pore size range of porous carbon materials for electrode preparation was 0.8–1.2 nm. At the same time, the porous carbon material had a good adsorption capacity for CO₂, and the adsorbent performance was 3.09 mmol/g at 0^∘C and 1 bar. Adsorbents with the pore size range of 0.5–0.8 nm had the best CO₂ adsorption performance. This integrated strategy study expanded biomass-derived porous carbon materials with controllable pore structures to match different application strategies. [ABSTRACT FROM AUTHOR]