Nanoporous active carbons at ambient conditions: a comparative study using X-ray scattering and diffraction, Raman spectroscopy and N2 adsorption

3rd International Conference on Small Angle Neutron Scattering dedicated to the 80 anniversary of Yu.M. Ostanevich

Shiryaev, A.A.^1 ; Voloshchuk, A.M.^1 ; Volkov, V.V.^2 ; Averin, A.A.^1 ; Artamonova, S.D.^1

Institute of Physical Chemistry and Electrochemistry RAS, Leninsky pr. 31, korp. 4, Moscow

119071, Russia^1

Institute of Crystallography RAS, Leninsky pr. 53, Moscow

119333, Russia^2

关键词: Ambient conditions;    Carbonaceous fibers;    Comparative studies;    Different precursors;    Electronic density;    Small angle scattering;    Small- and wide-angle X-ray scatterings;    Structural feature;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/848/1/012009/pdf
DOI  :  10.1088/1742-6596/848/1/012009

来源: IOP

【 摘 要 】

Furfural-derived sorbents and activated carbonaceous fibers were studied using Small- and Wide-angle X-ray scattering (SWAXS), X-ray diffraction and multiwavelength Raman spectroscopy after storage at ambient conditions. Correlations between structural features with degree of activation and with sorption parameters are observed for samples obtained from a common precursor and differing in duration of activation. However, the correlations are not necessarily applicable to the carbons obtained from different precursors. Using two independent approaches we show that treatment of SWAXS results should be performed with careful analysis of applicability of the Porod law to the sample under study. In general case of a pore with rough/corrugated surface deviations from the Porod law may became significant and reflect structure of the pore-carbon interface. Ignorance of these features may invalidate extraction of closed porosity values. In most cases the pore-matrix interface in the studied samples is not atomically sharp, but is characterized by 1D or 2D fluctuations of electronic density responsible for deviations from the Porod law. Intensity of the pores-related small-angle scattering correlates positively with SBETvalues obtained from N2adsorption.