Water-soluble pH-switchable cobalt complexes for aqueous symmetric redox flow batteries†
Hao
Wang, 
ab
Sayed Youssef
Sayed,
ab
Yuqiao
Zhou,
a
Brian C.
Olsen,
ab
Erik J.
Luber
ab
and
Jillian M.
Buriak
*ab
ab
Sayed Youssef
Sayed,
ab
Yuqiao
Zhou,
a
Brian C.
Olsen,
ab
Erik J.
Luber
ab
and
Jillian M.
Buriak
*ab
Abstract
A water soluble octahedral Co(II) complex, BCPIP-Co(II), with 4 appended carboxylic groups on the ligand periphery is utilized as both posolyte and negolyte in an aqueous, symmetric redox flow battery (RFB). The full RFB demonstrates coulombic efficiencies >99% for up to 100 cycles.
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