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Microporous carbon materials with extremely small pore size are prepared by employing polyaniline as a carbon precursor and KOH as an activating agent. CO(2) sorption performance of the materials is systematically investigated at the temperatures of 0, 25 and 75 °C. The prepared carbons show very high CO(2) uptake of up to 1.86 and 1.39 mmol g(-1) under 1 bar, 75 °C and 0.15 bar, 25 °C, respectively. These values are amongst the highest CO(2) capture amounts of the known carbon materials. The relation between CO(2) uptake and pore size at different temperatures is studied. An interesting and innovative point that the micropores with pore size smaller than a critical value play a crucial role in CO(2) adsorption at different temperatures is demonstrated. It is found that the higher the sorption temperature is, the smaller this critical value of pore size is. Pores smaller than 0.54 nm are manifested to determine CO(2) capture capacity at high sorption temperature, e.g. 75 °C. This research proposes a basic principle for designing highly efficient CO(2) carbon adsorbents; that is, the adsorbents should be primarily rich in extremely small micropores.

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Novel Fe3O4@Ti3C2 MXene hybrid exhibits great promise as a high volumetric performance anode material for lithium ion batteries.

Graphene aerogel (GA) is successfully prepared through hydrogen reduction of graphene oxide aerogel (GOA) which is self-assembled from graphene oxide solution and subsequently dried by a supercritical CO 2 method. The morphology, structure and surface property evolution in the preparation of GA are investigated intensively by a variety of means such as atomic force microscopy (AFM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), N 2 adsorption, X-ray diffraction (XRD), Raman spectroscopy, ultraviolet-visible absorption spectroscopy (UV-Vis), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR). A self-assembly mechanism based on the hydrogen-bonding interactions between hydroxyl groups and carbonyl groups is proposed for the first time to explain the formation of GA. As evidenced by elemental analysis (EA) and electrochemical measurements, this three dimensional GA has an unprecedented high C/O molar ratio of 69.9, which contributes to the excellent high-rate performance of this material for supercapacitor applications.

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