Fig. 2: The electrolyte system studied and T1 relaxation data used for image calibrations. | Nature Communications

Fig. 2: The electrolyte system studied and T1 relaxation data used for image calibrations.

From: Operando magnetic resonance imaging for mapping of temperature and redox species in thermo-electrochemical cells

Fig. 2

Molecular structures of a the tris(bipyridyl)cobalt cation Co(bpy)3, b the bis(trifluoromethanesulfonyl)-imide anion (TFSI) and c the 3-methoxypropionitrile (MPN) solvent. d, e Axial slice 1H T1 and 19F spin density contrast images obtained from electrolyte samples in 5 mm diameter NMR tubes at 20 °C (MPN with (1) 0.05 M Co2+(bpy)3(TFSI)2, (2) 0.10 M Co2+(bpy)3(TFSI)2, (3) 0.15 M Co2+(bpy)3(TFSI)2, (4) 0.05 M Co3+(bpy)3(TFSI)3, (5) 0.10 M Co3+(bpy)3(TFSI)3, (6) 0.15 M Co3+(bpy)3(TFSI)3 and (7) both 0.05 M Co2+(bpy)3(TFSI)2 and 0.05 M Co3+(bpy)3(TFSI)3). f Plot of 1H T1 relaxation times (blue circles) of the MPN protons as a function of temperature and Co2+ concentration, measured from electrolytes with a total Co(bpy)3 concentration of 0.10 M. The surface is a best fit to a polynomial function obtained using MATLAB (see Supplementary Information for details).

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