For efficient PEC solar hydrogen and MCH production, utilization of photocatalytic materials with narrow bandgap energy is indispensable. The combination of a photoanode and a photocathode can relax the requirements for the photoelectrodes through the accumulation of driving forces.
The solid solution of ZnSe and Cu(In, Ga)Se2, ZnSex:CIGS1-x, shows relatively large cathodic photocurrent with high onset potential under simulated sunlight.1,2) The PEC cell composed of surface modified ZnSe-CIGS photocathode and BiVO4 photoanode could drive water splitting reaction with a solar-to-hydrogen conversion efficiency of hither than 1%. The PEC cell consisting of ZnSe-CIGS based membrane-photoelectrode assembly (MPA) and a BiVO4 photoanode also showed spontaneous conversion of toluene to MCH with water as a hydrogen source. In the presentation, the effects of surface modifications on durability and performance of the PEC cell for direct production of hydrogen and MCH will be discussed.
1) H. Kaneko, T. Minegishi, M. Nakabayashi, N. Shibata, Y. Kuang, T. Yamada, K. Domen, Adv. Func. Mater., 2016, 26, 4570-4577.
2) H. Kaneko, T. Minegishi, M. Nakabayashi, N. Shibata, K. Domen, Angew. Chem. Int. Ed., 2016, 55, 15329-15333.