Möller Egert, Palm Rasmus, Tuul Kenneth, Härmas Meelis, Koppel Miriam, Aruväli Jaan, Külaviir Marian, Lust Enn
Institute of Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, Estonia.
Department of Applied Physics, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden.
Nanomaterials (Basel). 2023 Oct 31;13(21):2883. doi: 10.3390/nano13212883.
Highly microporous adsorbents have been under considerable scrutiny for efficient adsorptive storage of H. Of specific interest are sustainable, chemically activated, microporous carbon adsorbents, especially from renewable and organic precursor materials. In this article, six peat-derived microporous carbon materials were synthesized by chemical activation with ZnCl. N and CO gas adsorption data were measured and simultaneously fitted with the 2D-NLDFT-HS model. Thus, based on the obtained results, the use of a low ratio of ZnCl for chemical activation of peat-derived carbon yields highly ultramicroporous carbons which are able to adsorb up to 83% of the maximal adsorbed amount of adsorbed H already at 1 bar at 77 K. This is accompanied by the high ratio of micropores, 99%, even at high specific surface area of 1260 m g, exhibited by the peat-derived carbon activated at 973 K using a 1:2 ZnCl to peat mass ratio. These results show the potential of using low concentrations of ZnCl as an activating agent to synthesize highly ultramicroporous carbon materials with suitable pore characteristics for the efficient low-pressure adsorption of H.
高度微孔吸附剂一直受到大量审查，以实现氢气的高效吸附储存。特别令人感兴趣的是可持续的、化学活化的微孔碳吸附剂，尤其是由可再生和有机前驱体材料制成的。在本文中，通过用氯化锌进行化学活化合成了六种泥炭衍生的微孔碳材料。测量了氮气和一氧化碳气体吸附数据，并同时用二维非局部密度泛函理论 - 硬球（2D-NLDFT-HS）模型进行拟合。因此，基于所得结果，使用低比例的氯化锌对泥炭衍生碳进行化学活化可产生高度超微孔碳，在77K、1巴时，这些碳能够吸附高达已吸附氢气最大吸附量的83%。这伴随着高比例的微孔，即99%，即使在使用1:2氯化锌与泥炭质量比在973K下活化的泥炭衍生碳具有1260 m²/g的高比表面积时也是如此。这些结果表明，使用低浓度氯化锌作为活化剂来合成具有合适孔特征的高度超微孔碳材料以实现氢气高效低压吸附具有潜力。
