“…[12][13][14][15] Besides, Co(II) complexes of inorganic ligands, especially bicarbonate, greatly accelerated H 2 O 2 activation and pollutant degradation. [16][17][18] Moreover, cobalt-containing mixed-metal nanomaterials, such as spinel CoCr 2Àx Fe x O 4 , inverse spinel Ni 2 CoS 4 , Fe-Co nanosheets, and Co x Mn-layered double hydroxide, were synthesized and exhibited excellent H 2 O 2 activation performance. [19][20][21][22] Impressively, even though all these cobalt-containing catalysts could efficiently activate H 2 O 2 , the activation mechanism and major ROS were found to be significantly different.…”