Direct water electrolysis was achieved with a novel monolithic photoelectrochemical cell. Bipolar WO 3/Pt and dye-sensitized TiO 2/Pt semiconductor panels, capable of vectorial electron transfer, have been used for water splitting to yield hydrogen and oxygen; light is the only energy input. The hydrogen production efficiency of this tandem cell, based on the short-circuit current, was ∼1.9% and the maximum hydrogen production efficiency was ∼2.5% when 0.2 V positive bias was applied. When a concentrated LiCl aqueous solution was used as an electrolyte, valuable chlorine was obtained instead of oxygen. The maximum yielding efficiency of hydrogen and chlorine was ∼1.8%.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Materials Science(all)
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering