In this work, we constructed a photosynthetic bioelectrochemical cell, as depicted in Figure 1. In the anodic reaction, whole cells of cyanobacteria, Synechococcus sp.PCC7942, were used as a photosystem, while 2,6-dimethyl-1,4-benzoquinone (DMBQ) [20] or diaminodurene (DAD) was used as a mediator