中南大学
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返回首页Synergistic Pore Affinity Engineering in Tobacco Stem-Derived Carbon via Magnesium Citrate Dual Activation for High Hydrogen Storage
发布时间：2026-04-28
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- DOI码：
- 10.1016/j.carbon.2026.121633
- 发表刊物：
- Carbon
- 关键字：
- Hydrogen storagePorous carbon materialsStructural modificationBiomass utilizationHierarchical pore structure
- 摘要：
- Porous carbons face a critical trade-off between high surface area and weak H2 binding affinity, limiting their practical hydrogen storage capacity. Here, we circumvent this limitation by engineering a magnesium-decorated hierarchical porous carbon derived from tobacco stem waste through a dual-activation strategy with magnesium citrate. The multifunctional modifier serves a dual role: it functions as an in-situ porogen, yielding an ultrahigh specific surface area of 4577 m2 g−1 and a micropore volume of 1.45 cm3 g−1, while simultaneously introducing atomically dispersed C–O–Mg motifs onto the carbon matrix. This synergistic design achieves exceptional H2 uptake of 3.56 wt% at 1 bar and 5.80 wt% at 50 bar (77 K), markedly outperforming conventional porous carbons under low-pressure conditions. First-principles energy decomposition analysis (SAPT) reveals that the enhanced binding originates from a unique interplay of electrostatic and induction forces induced by the C–O–Mg groups, coupled with orbital hybridization between Mg 3s and H2 σ∗ orbitals. This work transforms biomass waste into a high-performance storage medium by decoupling the traditional porosity affinity trade-off, offering a sustainable blueprint for designing advanced adsorbents through targeted heteroatom engineering.
- 论文类型：
- 期刊论文
- 论文编号：
- 121633
- 卷号：
- 256
- 是否译文：
- 否
- 发表时间：
- 2026-04-28
- 收录刊物：
- SCI