. 2019 Feb 4;9:1316. doi: 10.1038/s41598-018-36683-8

Table 2.

CuO-based photocatalytic systems for CO₂ reduction to CH₄.

Catalysts	Condition	Irradiance	CH₄ (μmol.g⁻¹ h⁻¹)	Ref.
CuO	300 W Xe lamp	100 mW cm⁻²	2.96	⁹*
CuO	100 W Xenon solar	—	19.7	¹⁰*
Cu₂O	125 W Hg lamp	—	16.0	¹¹
Cu₂O/TiO₂	300 W Xe lamp	20.5 mW cm⁻²	0.99	¹²
CuO	5 W UVC lamp	5.5 mW cm⁻²	39.5	This work

^*Normalized units.