Nowadays, it is necessary to find a new energy conversion method to solve the energy crisis. Environmental pollution is another critical problem which needs to be solved. In addition, solar energy is a clean, abundant, reproducible energy source in the world. Photoelectrochemical fuel cell (PEC) is an energy conversion and pollutant-clean system using solar energy. The significant characteristics of PEC are the generation of electric energy, the splitting of the water, and degraded contaminative solutions. Nowadays, the PEC field is still short of intensive research because this is an...