Table 4. Amount of the Produced Formic Acid for Photocatalytic CO₂ Reduction over Different Controlled Experiments after 8 h Light Irradiation.

entry	photocatalyst	time (h)	HCOOH (μmol)	selectivity (%)
1	Cu-PMOF	8	130.6	100
2	Co-PMOF	8	103.47	100
3	free TCPP ligand	8	17.06	100
4a	dark	8	n.d.
5b	no photocatalyst	8	n.d.
6c	no TEOA	8	n.d.
7d	no CO2	8	n.d.

^aperforming CO₂ reduction in the dark;.

^bwithout photocatalysts;.

^cin the absence of TEOA;.

^dusing N₂ instead of CO₂ as a reactant.