Pt-free tandem molecular photoelectrochemical cells for water splitting driven by visible light.

Physical chemistry chemical physics : PCCP

PubMedID: 25341620

Fan K, Li F, Wang L, Daniel Q, Gabrielsson E, Sun L. Pt-free tandem molecular photoelectrochemical cells for water splitting driven by visible light. Phys Chem Chem Phys. 2014;.
Photoelectrochemical (PEC) cells using molecular catalysts to split water into hydrogen and oxygen have been investigated intensively during the past years. However, the high-cost of Pt counter electrodes and instability of molecular PEC cells hinder the practical applications. We describe in this article a Pt-free tandem molecular PEC cell, for the first time, employing molecular ruthenium- and cobalt-catalysts with strong dipicolinic acid anchoring groups on the respective photoanode and photocathode for total water splitting. The Pt-free tandem molecular PEC cell showed an effective and steady photocurrent density of ca. 25 µA cm(-2) for water splitting driven by visible light without external bias. This study indicates that tandem molecular PEC cells can provide great potential to the Pt-free devices for light driven total water splitting.