Nanoparticle Organic Hybrid Materials (NOHMs) have recently been popular as novel electrolytes due to their capability to bind redox-active moieties for electrochemical applications. Still, their high viscosity limit their use in many applications. The addition of salts lowers the viscosity significantly. This study characterizes the ion transport phenomena within water-based NOHM-polymer electrolytes using pulsed-field gradient nuclear magnetic resonance (NMR) methods. The addition of salt to the solution leads to modification of the structural configuration of the canopy of NOHMs, namely causing a decrease in the hydrodynamic radius of NOHMs. We have studied the diffusion coefficient of various salt concentrations added to 10 wt% of NOHM-I-HPE aqueous solution at room temperature. We report that the diffusion coefficients for all the nuclei decrease with the addition of salt up to a maximum value and then decrease with further increase in salt concentration for added salt NaCl, but show a monotonic decrease for AlCl3. The results suggest different degrees of canopy-cation interaction for monovalent and trivalent cations.

NMR diffusivity study of salt doping in NOHM based electrolytes

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ACS Fall 2022

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