Extended Data Fig. 7: 13C ssNMR study of carbon capture of PCS-OH.
From: Capturing carbon dioxide from air with charged-sorbents
(a) 13C ssNMR (9.4 T) spectrum of blank activated carbon cloth. A 90° pulse-acquire sequence was applied, and a sample MAS rate of 12.5 kHz was used. A broad resonance arising from sp2-hybridised carbon is observed. (b) 13C ssNMR (9.4 T) spectrum of solid KHCO3. A 90° pulse-acquire sequence was used, with a sample MAS rate of 12.5 kHz. (c) 13C ssNMR (9.4 T) spectrum of PCS-OH prepared with a smaller positive potential of 0.365 V vs. SHE, and loaded with 13CO2 gas at a pressure of 0.9 bar. A 3.2 mm magic angle spinning HXY probe was used, with a one-pulse 13C experiment, and the sample spinning rate was 12.5 kHz. The recycle delay was set to be sufficiently long to ensure the spectrum was quantitative. The measurements show a smaller quantity of chemisorbed CO2 compared to NMR measurements on PCS-OH synthesized by applying a potential of 0.565 V vs. SHE (see the main text).
