Publication date: 16th April 2014
The conversion efficiency is divided into 4 parts, i.e., maximum conversion efficiency of solar cell, operation efficiency for voltage and current matching, overpotential of electrochemical cell, and Faradic efficiency. From the efficiency analysis of our PEEC driven by CPV, the efficiency of solar cell, operation matching, overpotential, and Faraday were 27.6, 88.6, 64.9, and 91.4%, respectively. The conversion efficiency of the solar cell is the problem for the materials and structure of solar cell, thus, it is not discussed here. In the other efficiencies, overpotential efficiency need to be improved compared with the other two. The overpotentilal for water splitting contains two, that is, that of hydrogen and oxygen evolution. From the analysis of a previous report [2], the lowest overpotential of hydrogen and oxygen evolution with electrocatalyst from water at 1 mA are 0.01 and 0.19 V, respectively. It is clear that the overpotential reduction for oxygen evolution is the key for the reduction of the overpotential. The oxygen evolution electrocatalyst also has another problem that almost all of them are precious metal oxides.
We proposed CaMn2O4·nH2O, which is inspired from oxygen evolution center of photosystem-II (PS-II), as an oxygen evolution electrocatalyst to solve the problems. The CaMn2O4·nH2O was synthesized using hydrothermal technique and evaluated using the mixture of carbon paste and the catalyst as an electrode in 1.0 mol/L NaOH aqueous solution. The results is still preliminary but relatively good catalytic effect. The overpotential for carbon paste : catalyst = 2:1 in 1.0 mol/L NaOH was similar to that of LaCoO3 of the report [2].
[1] K. Fujii et al., Int. J. Hydrogen Energy 38 (2013) 14424.
[2] T. R. Cook et al., Chem. Rev. 110 (2010) 6474.
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