Presentation Information
[19a-D903-8]Improved hydrogen production efficiency of 3-junction III-V solar cells loaded with electroplated platinum black catalysts
〇Harufumi Takada1, Tomohiro Arai1, Ryotaro Fujita1, Taiga Shibuya1, Taiga Komiyama1, Shiro Uchida1 (1.Chiba Inst.)
Keywords:
artificial photosynthesis,Hydrogen evolution
Recently, the study of hydrogen production by artificial photosynthesis using multi-junction compound solar cells has attracted much attention. In this study, platinum black electrolysis was used as a catalyst for the grid electrode of a triple junction solar cell (InGaP/InGaAs/Ge). The plating shape was improved by changing the plating method from the conventional constant-current method to the pulsed-current method, and the hydrogen production efficiency was increased. The electrode width W of the sample obtained by constant-current plating was 20.20 μm and the shadowing loss (S.L.) was 15.3% on the surface of the cell. On the other hand, the sample obtained by pulse current plating had W=19.9 μm (S.L =15.1 %). Although the electrode widths were almost the same, the current generated under simulated sunlight was more degraded in the constant current sample than in the pulsed sample. The solar to hydrogen energy (STH) of the pulsed current sample was 9.7%, which was higher than that of the constant current sample (8.5%).This is thought to be due to the effect of the pulse current on the thickness of the diffusion layer in the plating solution, which changed the shape of the plating.