To understand the observations described above, we investigated how DHA, the disproportionation product of DHAQ 4-, is affected under various cycling conditions in the negolyte against a ferro/ferricyanide posolyte. We define the conversion efficiency as the fraction of DHA converted to DHAQ. Because the main decomposition product in a DHAQ  ferro/ferricyanide cell is DHA , the conversion efficiency is expected to remain the primary determinant of the recovery efficiency. However, other decomposition mechanisms, implications of which are not entirely discerned, may also contribute to the recovery efficiency.