NOVELTY - A hybrid photoelectrochemical and microbial fuel cell device consists of a single-chamber photoelectrochemical device containing n-type titanium dioxide photoanode and platinum counter electrode in aqueous electrolyte solution, and a dual-chamber microbial fuel cell device. The dual-chamber microbial fuel cell device consists of an anode chamber and a cathode chamber separated by cation exchange membrane. The anode chamber has a carbon anode and comprises microorganisms, and cathode chamber has platinum-loaded carbon cathode electrically connected to platinum-counter electrode.    USE - Hybrid photoelectrochemical and microbial fuel cell device is used for self-sustained hydrogen gas production, and wastewater treatment.    DETAILED DESCRIPTION - A hybrid photoelectrochemical and microbial fuel cell device consists of a single-chamber photoelectrochemical device containing n-type titanium dioxide photoanode and platinum counter electrode in aqueous electrolyte solution, and a dual-chamber microbial fuel cell device. The dual-chamber microbial fuel cell device consists of an anode chamber and a cathode chamber separated by cation exchange membrane. The anode chamber has a carbon anode and cathode chamber has platinum-loaded carbon cathode, where the anode chamber comprises microorganisms, and carbon anode is electrically connected to platinum-counter electrode. The platinum-loaded carbon cathode is electrically connected to titanium dioxide photoanode, where a light source creates photo-excited electron-hole pairs at photoanode which are separated by electric field at an interface of photoanode and electrolyte solution. The holes oxidize water into oxygen, where electrons flow from photoanode to platinum-loaded carbon cathode, dissolved oxygen in the cathode chamber is reduced, microorganisms are oxidized to produce bioelectrons, and the bioelectrons are transferred to platinum electrode and reduce protons to form hydrogen gas.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of hybrid photoelectrochemical and microbial fuel cell device.