Spontaneous Generation of H2O2 and Hydroxyl Radical through O2 Reduction on Copper Phosphide under Ambient Aqueous Condition

Copper phosphide (Cu x P) was synthesized and tested for its reactivity for generating H 2 O 2 through spontaneous reduction of dioxygen under ambient aqueous condition. The in situ generated H 2 O 2 was subsequently decomposed to generate OH radicals, which enabled the degradation of organic compounds in water. The oxygen reduction reaction proceeded along with the concurrent oxidation of phosphide to phosphate, then copper ions and phosphate ions were dissolved out during the reaction. The reactivity of Cu x P was gradually reduced during 10 cycles with consuming 8.7 mg of Cu x P for the successive removal of 17 μmol 4-chlorophenol. CoP which was compared as a control sample under the same experimental condition also produced H 2 O 2 through activating dioxygen but did not degrade organic compounds at all. The electrochemical analysis for the electron transfers on Cu x P and CoP showed…