Browsing by Author "Zhang, Gengyi"

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    Hierarchically porous and single Zn atom-embedded carbon molecular sieves for H2 separations
    (Springer Nature, 2024) Hu, Leiqing; Lee, Won-Il; Roy, Soumyabrata; Subramanian, Ashwanth; Kisslinger, Kim; Zhu, Lingxiang; Fan, Shouhong; Hwang, Sooyeon; Bui, Vinh T.; Tran, Thien; Zhang, Gengyi; Ding, Yifu; Ajayan, Pulickel M.; Nam, Chang-Yong; Lin, Haiqing
    Hierarchically porous materials containing sub-nm ultramicropores with molecular sieving abilities and microcavities with high gas diffusivity may realize energy-efficient membranes for gas separations. However, rationally designing and constructing such pores into large-area membranes enabling efficient H2 separations remains challenging. Here, we report the synthesis and utilization of hybrid carbon molecular sieve membranes with well-controlled nano- and micro-pores and single zinc atoms and clusters well-dispersed inside the nanopores via the carbonization of supramolecular mixed matrix materials containing amorphous and crystalline zeolitic imidazolate frameworks. Carbonization temperature is used to fine-tune pore sizes, achieving ultrahigh selectivity for H2/CO2 (130), H2/CH4 (2900), H2/N2 (880), and H2/C2H6 (7900) with stability against water vapor and physical aging during a continuous 120-h test.