[6a-A401-1~9] 1.4 Energy conversion, storage, resources and environment

[6a-A401-2] Investigation of artificial photosynthesis using InGaP/GaAs double junction solar cell

〇(M1)Yuki Nakamura¹, Keisuke Baba¹, Daiki Onoduka¹, Kenta Murakami¹, Takumi Nemoto¹, Tatsuki Yode¹, Tomotaka Ito¹, Yosuke Honma¹, Yoshiaki Ajima¹, Hideo Teramoto¹, Ryota Jomen¹, Pan Dai², Shulong Lu², Shiro Uchida¹ (1.Chiba Inst., 2.Suzhou Inst.)

Keywords:Artificial photosynthesis, Energy conversion

We report the results of artificial photosynthesis experiments using InGaP / GaAs two-junction solar cell with Pt co-catalysts. Two samples with 60μm and 124μm diameter circular Pt co-catalysts evaporated on the surface of InGaP/GaAs structures were prepared. Pt plate as a counter electrode and 0.5 M KHCO₃ as an electrolyte were used to measure a photocurrent. Furthermore, surface reflectivities were also measured for these samples. As a result, sample with 124μm diameter Pt circular showed a higher photocurrent compared to 60μm one, despite having a higher reflectivity. It is essential to optimize a size of Pt co-catalyst.