Membrane technology is an effective strategy for gas dehumidification and fuel cell humidification. In this study, cerium fluoride oxide (F-Ce) two-dimensional (2D) mesoporous nanosheets and their composite with 1-ethyl-3-methylimidazolium dicyanamide ([Emim][DCA]) ionic liquids (ILs) (IL@F-Ce) are introduced as fillers into polyether block amide (PEBAX® 1074) to fabricate mixed matrix membranes (MMMs). The slit-shaped mesoporous structure of the nanosheets facilitates the construction of water vapor rapid transport channels in MMMs. The permeability and selectivity of water vapor for MMMs loaded with F-Ce nanosheets are greatly improved, and the performance of MMMs loaded with IL@F-Ce nanosheets are much better than the former. Particularly, the MMM with IL@F-Ce content of 4 wt.% achieves the highest H 2 O permeability of 4.53 × 10 5 Barrer, which is more than twice that of the pure PEBAX membrane, and the selectivity is increased by 83%. Thus, the MMMs based on 2D mesoporous nanosheets have considerable potential application in industrial-scale dehydration and humidification processes.
The sluggish kinetics of the oxygen evolution reaction (OER) caused by the complex process significantly hinder the advancement of electrolytic water to hydrogen technology. Herein, the valence of Ru is modulated and stabilized through inducing the electronic competition between Mo and Ru, and the charge transfer from Fe, Co, and Ni to Ru in 2D porous FeCoNiMoRu high entropy oxides (HEO) nanosheets to achieve efficient and stable OER. The 2D porous structure of FeCoNiMoRu HEO contributes to the high exposure of active sites while promoting rapid mass transfer, which can facilitate oxygen-evolving kinetics of the catalyst. Consequently, the optimized catalyst (FeCoNiMoRu HEO) surpasses RuO 2 (315 mV) in OER catalytic activity, exhibiting an overpotential of 226 mV at 10 mA cm −2 . Notably, the mass activity of FeCoNiMoRu HEO is nearly 18.6-fold that of RuO 2 . Combined experimental and theoretical analysis, a charge competition between Mo and Ru atoms, and the charge transfer from Fe, Co, and Ni elements to Ru in HEO can buffer the change of valence of Ru and modulate its electronic structure, thus enhancing the activity and durability of FeCoNiMoRu HEO during OER.
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