Won't work. The freezing points of H2O and H2O2 are almost identical.
You shouldn't be trying to concentrate hydrogen peroxide anyway. Concentrated hydrogen peroxide is incredibly dangerous, both as a corrosive substance and an explosive.
-0.43 °C, 273 K, 31 °F
anything lesser than this.
For 20 - 40% Hyrogen Peroxide it is:
FREEZING POINT: -15oC/6oF (20%); -26oC/-15oF (31%); -33oC/-27oF (35%)
Freezing point of H2O2 is - 0.43 °C