Stable energy storage
To improve the challenges of energy density with redox flow batteries, researchers explored using a nonaqueous system and molecular engineering to create better redox materials.
The study focused on phosphine oxides, specifically cyclic triphenylphosphine oxide (CPO), which has a very negative potential (-2.4 V vs Fc/Fc+). CPO is made from TPPO. Its unique structure, achieved through cyclization, enhances stability.
By studying how CPO breaks down in different conditions, scientists developed a solvent mix (acetonitrile/DMF).
The scientists next used static electrochemical charge and discharge studies, which are akin to charging a battery, using it, and then charging it again and again, to assess the molecule’s robustness as a possible energy-storage agent.
The battery remained remarkably healthy after 350 cycles, gradually losing very little capacity.