Complexes Containing Redox Non-Innocent Ligands for Symmetric, Multi-Electron Transfer Non-Aqueous Redox Flow Batteries

(Top) Functionalized chromium bipyridine complexes (left), and solubility data for the charged and neutral species (right).
(Bottom) Charge-discharge curves for the Cr(L3)3 complex: A) Full H-cell potential, B) Positive electrode potential, and C) Negative electrode potential. Multiple plateaus are observed, indicating multi-electron transfer.

Scientific Achievement

Designed and synthesized functionalized chromium-bipyridine complexes with high solubilities that undergo up to 6 electron transfers over a ~2 V window

Significance and Impact

  • Significantly enhanced solubility by functionalizing non-innocent ligand scaffold
  • Demonstrated symmetric cell that achieved multiple electron transfer at positive and negative electrodes
  • Developed strategies to manipulate solubilities and electrochemistries of metal coordination complexes that could be used to enhance other active species

Research Details

  • Characterized variations in solubility as a function of state of charge for bipyridine complexes
  • Potentials of the positive and negative charge/discharge plateaus are consistent with the redox couples observed in cyclic voltammetry

Work was performed at the University of Michigan (JCESR Partner), Department of Chemistry and Department of Chemical Engineering by     P. J. Cabrera, X. Yang, J. A. Suttil, K. L. Hawthorne, R. E. M. Brooner, M. S. Sanford, and L. T. Thompson, Journal of Physical Chemistry C, 2015.

DOI 10.1021/acs.jpcc.5b03582

Download this highlight

Latest Updates

See All