A 24.4% solar to hydrogen energy conversion efficiency by combining concentrator photovoltaic modules and electrochemical cells

作者：Nakamura Akihiro; Ota Yasuyuki; Koike Kayo; Hidaka Yoshihide; Nishioka Kensuke; Sugiyama Masakazu^*; Fujii Katsushi

来源：Applied Physics Express, 2015, 8(10): 107101.

DOI：10.7567/APEX.8.107101

The highest efficiency of 24.4% for the solar-to-hydrogen (STH) energy conversion was obtained in an outdoor field test by combining concentrator photovoltaic (CPV) modules with InGaP/GaAs/Ge three-junction cells and polymer-electrolyte electrochemical (EC) cells. The high efficiency was obtained by using the high-efficiency CPV modules (similar to 31% under the present operation conditions) and the direct connection between the CPV modules and the EC cells with an almost optimized number of elements in series. The STH efficiency bottleneck was clarified to be the efficiency of the CPV modules, the over-potential of the EC cells, and matching of the operation point to the maximal-power point of the CPV modules.

• 出版日期2015-10