The estimated best H2 production performance, i.e., maximum substrate-to-hydrogen conversion efficiency of 0.61 and light conversion efficiency of 3.20%, was achieved at: benzoate concentration 9.97 mM, NH4Cl concentration 0.21 g/L and pH 6.76.
Studies with Rhodobacter sphaeroides O.U. 001 resulted in a cumulative hydrogen production of 492 ± 10 mL with maximum production rate of 11 mL L−1 h−1, substrate (malic acid) conversion efficiency of 44.4% and light conversion efficiency of 3.31%.
Some electrons get lost along the way, leading to low light conversion efficiency.
For high light conversion efficiency DSSCs require a mesoporous structure exhibiting a high surface area.
Comparing sample A with sample B, the light conversion efficiency was increased from 5.6%to6.4%4%, indicating an approximately 14% improvement of the total energy conversion efficiency.
In addition, PFB suffer a light shading effect from DFB in the co-culture system, which could decrease the light conversion efficiency.
Finally, light conversion efficiencies might be improved by use of proper light intensities through reduction in the size of the photosynthetic antennae, [ 49].
From the illustration, performance parameters like maximum output power density (Pmax), Voc, fill factor (FF = Pmax/(JscVoc), and the actual light-conversion efficiency can be obtained.
The solar cells' overall light-conversion efficiency, however, was a relatively poor 1.5percentt.
Under a FF of approximately 76.01%, the light-conversion efficiency is predicted to be 13.72%.
It is predicted that the light-conversion efficiency can be up to 13.72%.
