With the increasing use of intermittent renewable energy, there is a need for the development of efficient energy storage methods. Non-aqueous redox flow batteries (NARFBs) show promise for this application due to the modularity that results from decoupled power and energy. As such, there has been a growing interest in redox-active transition metal complexes, supported by non-innocent ligands, to act as redox carriers and fully utilize the wide electrochemical window in NARFBs. Accordingly, we have synthesized a family of nickel and iron complexes containing bridged bis-picolinamide ligands, [M<sup>+2</sup>(bpR)], where M = Fe or Ni, and R is the bridge, ethyl, propyl or phenyl. These complexes display all the essential qualities required for commercialization of NARFBs: multiple reversible redox events, &gt; 3V cell potentials, and high stability - all of which result in superior energy density for the system. The synthesis, electrochemistry, cyclability, and stability of this family of complexes will be discussed.

Transition metal complexes supported by bridged bis-picolinamide ligands for use in non-aqueous redox flow batteries

2019 Spring National Meeting

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