Effect of the Backbone Tether on the Electrochemical
Properties of Soluble Cyclopropenium Redox-Active Polymers
Posted on 2018-04-23 - 20:30
Few
reports to date have focused on the chemical and electrochemical
reversibility of redox pendants assembled into soluble redox-active
polymers (RAPs). Here we report a series of soluble RAPs for flow
battery applications designed with cyclopropenium (CP) pendants. The
tether length between CP and a polystyrene backbone was varied and
found to influence electrochemical activity and stability. Different
tether lengths of x methylene groups (x = 1–7) were simulated, and x = 1, 5, and
7 were synthesized to evaluate experimentally. This study illustrates
that polymers with extended tether groups display an improved reversibility
in cyclic voltammetry. The behavior is mirrored in the stability of
the charged state tested in galvanostatic half-cells. When paired
with a viologen polymer, these CP-based polymers produce a 1.55 V
nonaqueous flow battery. The capacity decays for the polymers were
structure-dependent, which provides empirical insight into materials
design for high potential catholyte polymers.
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Montoto, Elena
C.; Cao, Yu; Hernández-Burgos, Kenneth; Sevov, Christo S.; Braten, Miles N.; Helms, Brett A.; et al. (2018). Effect of the Backbone Tether on the Electrochemical
Properties of Soluble Cyclopropenium Redox-Active Polymers. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.8b00574