High-efficiency integrated multijunction photovoltaic/electrolysis systems for hydrogen production

摘要

In this study, two integrated PV/electrolysis systems were studied. An integrated PV/electrolysis device is a device where the PV system and the electrolyser are combined into a single system. In the case studied here, the areas of the PV device and the electrolyzer are identical. Multijunction photovoltaic (PV)/electrolysis configurations were investigated, And a high solar-to-hydrogen conversion efficiency cell demonstrated. The energy diagram of the configuration has been Evaluated and exemplified with n/p, n/p-GaInP/GaAs(Pt)/KOH electrolyte and triple-junction p-I-n a-Si(Pt)/KOH elec- Trolyte photovoltaic/electrolysis cells, The efficiency of the cells was determined based on the short-circuit photocurrent. Measurements were obtained both indoors under 100-mW/cm~2 insolation, and outdoors. For the a-Si system, a 7.8/100 Solar-to-hydrogen conversion efficiency was demonstrated. For the GaAs/GaInP_2system, the solar-to-hydrogen conversion Efficiency was over 16/100. Published by Elsevier Science Ltd on behalf of the Internatinal Association for Hydrogen Energy.