Methods for Calculating Activity in Photocatalytic CO₂ Reduction

product in relation to the total product amount. 

R_product: Reaction rate of the target product (μmol·h^-1·g^-1); 

R_electron: Electron consumption rate (μmol·h^-1·g^-1); 

K₁, K₂, K₃: Different product corresponding transferred electron numbers, see Table 1.  

5. Photocatalytic CO₂ reduction apparent quantum yield (AQY)^[4]: The ratio of the number of electrons transferred in the reaction to the number of incident photons under specific monochromatic wavelength conditions. 

Ne: Total number of transferred electrons in the reaction; 

n_product: Amount of material of the product (μmol); 

K₁, K₂, K₃: Different product corresponding transferred electron numbers, see Table 1; 

Np: Number of incident photons. For more details, see "Quantum Yield (AQY) Calculation Tutorial, You Deserve to Have!". 

6. Photocatalytic CO₂ reduction solar-to-chemical energy conversion efficiency (STC)^[8]: The efficiency of converting solar energy into chemical energy, calculated as follows: 

R_product: Reaction rate of the target product (mol·s^-1); ∆Gr: Molar Gibbs free energy of the target reaction (J·mol^-1); 

H₂O(l) → H₂(g) + 1/2O₂(g)           ∆Gr = 237 kJ·mol^{-1 [2]}; 

CO₂(g) → CO (g) + 1/2O₂(g)         ∆Gr = 257 kJ·mol^-1 [2]; 

CO₂(g) + 2H₂O(l) → CH₄ (g) + 2O₂(g)  ∆Gr = 890.9 kJ·mol^-1 [2]; 

Psun: Optical power density of the AM 1.5G standard solar spectrum (1000 W·m^-2); 

S: Illuminated area (m²).

The above content is translated and summarized by the author based on the reference literature. The author's level is limited, so if there are any errors, please correct them!