How the activation process modifies the hydrogen storage behavior of biomass-derived activated carbons

摘要: Microporous activated carbons (ACs) derived from biomass residues, by virtue of their low-cost, good thermo-mechanical stability and easy adsorbent regeneration, are widely considered as hydrogen storage materials for near-term applications. The uptake performance is known to depend on the pore-textural surface characteristics, such size distribution micropores specific area. Here, we present a detailed investigation how activation processes using KOH, CO2, K2CO3, H3PO4 modify microstructure olive stones-derived ACs they affect ACs’ behavior. KOH-activation results in formation exfoliated graphene sheets, which not common lignocellulose-derived ACs. In addition, forms supermicropores (1–2 nm) that enhance capacity at high pressures (200 bar). absolute adsorption KOH-activated sample 200 bar 77 K 6.11 wt%, among highest reported carbon samples. best density per area obtained 2.1 × 10−3 wt% m−2 g very close theoretical maximum single sheet. CO2 activations more effective creation ultramicropores (d ≤ 0.7 nm) matrix. This order pore useful when performed sub-atmospheric pressures. Our study suggests with homogenous centered narrow range efficient H2 adsorbents bimodal PSD.