Co?N graphene encapsulated cobalt catalyst for H2O2 decomposition under acidic conditions

Hydrogen peroxide (H 2 O 2 ) has been listed as one of the 100 most important chemicals in the world. However, huge amount of residual H 2 O 2 is hard to timely decomposed into O 2 and H 2 O under acidic condition, easily resulting in explosion hazard. Here, we reported a core–shell structure catalyst, that is graphene with Co  N structure encapsulated Co nanoparticles. Co  N graphene shell serves as the active site for the H 2 O 2 decomposition, and Co core further enhance this decomposition. Benefiting from it, the H 2 O 2 decomposition were close to 100% after 6 cycles without pH adjustment, which increased 6 orders of magnitude compared with no catalyst. At the same time, the O 2 generation reached 99.67% in 2 h with little metal leaching, and ·OH has been greatly inhibited to only 0.08%. This work can cleanly remove H 2 O 2 with little deep oxidation and protect the process of H 2 O 2 utilization to achieve a safer world.