Yingrong Wang

1 Introduction The advanced oxidation processes (AOPs) based on molecular oxygen (O2) activation are a novel technique with environmental beginning prospect owing to the naturally occurring O2 in the atmosphere.[1, 2] Yet the naturally occurring ground-state O2 (3O2) encounters a spin-forbidden reaction due to the parallel spin orientation of its two outermost electrons in degenerate π* antibonding orbitals,[3, 4] which impedes O2 activation under mild conditions due to its relative stable...