Figure 3.

(a) Schematic illustration of N-bromosuccinimide treated cobalt oxide nanoparticles and (b) CH₄ formation rate over catalysts with different surface treatments. Reprinted with permission from ref (99). Copyright 2019 Royal Society of Chemistry. (c) Comparison of CO₂ reduction performances of different catalysts. Reprinted with permission from ref (102). Copyright 2019 Wiley-VCH. (d) Schematic illustration of CO₂ reduction using a Ru complex/C₃N₄ hybrid photocatalyst and (e) the turnover number of HCOOH production as a function of irradiation time using different photocatalysts and solvents. Reprinted with permission from ref (103). Copyright 2019 Wiley-VCH. (f) The turnover number of CO evolution as a function of irradiation time over modified iridium(III) photocatalyst. Reprinted from ref (104). Copyright 2017 American Chemical Society.