Controlling metallic Co0 in ZIF-67-derived N-C/Co composite catalysts for efficient photocatalytic CO2 reduction

An efficient photocatalytic CO2 reduction has been reported in ZIF-67-derived-Co nanoparticles (NPs) encapsulated nitrogen-doped carbon layers (N-C/Co). This work demonstrates that the pyrolysis temperature is crucial tuning grain size and components of metallic Co0 N-C/Co composite catalysts, which optimizes their activities. Syntheses were conducted at 600, 700, 800°C giving N-C/Co-600, N-C/Co-700, N-C/Co-800 samples, respectively. N-C can well wrap Co NPs obtained a low (600°C) owing to smaller grains than those other samples. A high content N-C/Co-600 sample be attributed effective inhibition surface oxidation. By contrast, CoOx oxides N-C/Co-700 samples cover inside cores, inhibiting charge separation transfer. As result, yields best activity. The monoxide hydrogen generation rates are as 1.62 × 104 2.01 µmol g?1 h?1, Additionally, make catalysts magnetic, enabling rapid facile recovery with assistance an external magnetic field. expected provide instructive guideline for designing metal-organic framework-derived carbon/metal catalysts.