Fig. 7: Evolution of the 13C T1 relaxation time constants for CO2 (green circles) and \({{{{{{{{{\rm{HCO}}}}}}}}}_{3}}^{-}\) (purple, red, and blue circles), starting at the open circuit voltage (OCV) stage. | Communications Chemistry

Fig. 7: Evolution of the 13C T1 relaxation time constants for CO2 (green circles) and \({{{{{{{{{\rm{HCO}}}}}}}}}_{3}}^{-}\) (purple, red, and blue circles), starting at the open circuit voltage (OCV) stage.

From: In operando NMR investigations of the aqueous electrolyte chemistry during electrolytic CO2 reduction

Fig. 7

At the chronoamperometry (CA) stage, the \({{{{{{{{{\rm{HCO}}}}}}}}}_{3}}^{-}\) signal splits into two components for which different relaxation time constants for free ions and xSIPs can be distinguished. With increasingly negative potential at the CA and chronopotentiometry (CP) stage, CO2 approaches the \({{{{{{{{{\rm{HCO}}}}}}}}}_{3}}^{-}\) xSIPs in terms of T1. The error bars represent the fitting error received for T1 determination. The term xSIP represents ion pairs with one (x = 1) or two (x = 2) solvent layers between anion and cation.

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