Figure 2.

(A) As‐recorded O₂ evolution profiles for Co₄, Co₉ and Co₂₀ compounds along with the reference {Co₄P₂W₁₈}, measured from 20 μm POM solutions buffered in 80 mm borate buffer at pH 8 and containing Na₂S₂O₈ (5 mm) and [Ru(bpy)₃]²⁺ (1 mm) as an oxidant and a photosensitizer, respectively. (B) Recorded oxygen evolution amounts as a function of POM catalyst concentrations measured for 2, 5, 10 and 20 μm values. A summary of as‐recorded profiles is shown in Figure S23. (C) Amount of generated O₂ plotted as TONs as a function of pH (7.5–9). The bars indicate an average O₂ amount generated by all three catalysts at a certain pH to demonstrate a cumulative effect of pH on activity. For all conditions, a monochromatic visible LED (λ _max=445±13 nm) was chosen as light source to trigger photocatalytic reaction.