Journal: Environmental Science & Technology
Article Title: Armoring of MgO by a Passivation Layer Impedes Direct Air Capture of CO 2
doi: 10.1021/acs.est.3c04690
Figure Lengend Snippet: Characterization of the short-term experiments. (a) Light microscopy image of the measurement location of Raman spectra displayed in panel b for MgO reacted for 189 days with atmosphere. (c) TEM–BF image of MgO reacted for 167 days with atmosphere showing pristine MgO and small, newly formed crystallites. (d) Electron diffraction pattern of panel c. (e and f) FFT of areas highlighted in panel c, indicating single-crystal MgO and a new polycrystalline phase. Calculated d spacings indicate that this is most likely brucite. Diffraction spots stem from bulk MgO. (g) TEM–BF image of the reaction layer on MgO after 167 days of exposure to ambient air. (h) STEM–EELS imaging area shown for (i) carbon and (j) oxygen.
Article Snippet: The scanning transmission electron microscopy electron energy loss spectroscopy (STEM–EELS) experiments were performed using a Gatan Quantum EEL spectrometer with a dispersion of 0.3 eV/channel.
Techniques: Light Microscopy, Imaging