Figure 22.

Schematic view of the nanodevice, which comprises a gold electrode that supplies electrons leading to the reduction of the oxidized form of N−methylphenazonium methyl sulfate (PMS). Subsequently, PMS donates an electron to the chlorophyll a dimer P700 in PSI, which becomes excited to a higher energy level upon exposure to light. The electrons then travel through the acceptor site’s FB cluster before being transferred to the distal iron sulfur cluster of the hydrogenase (MBH). Finally, the electrons arrive at the active site, where protons are reduced to form molecular hydrogen. (Reprinted with permission from Ref. [216], Copyright 2009, ACS).