title: Pt-free tandem molecular photoelectrochemical cells for water splitting driven by visible light.
abstract: 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.
authors.affiliation: Department of Chemistry, KTH Royal Institute of Technology, 10044 Stockholm, Sweden. lichengs@kth.se.
authors.forename: Ke
authors.initials: K
authors.lastname: Fan
authors.forename: Fusheng
authors.initials: F
authors.lastname: Li
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Quentin
authors.initials: Q
authors.lastname: Daniel
authors.forename: Erik
authors.initials: E
authors.lastname: Gabrielsson
authors.forename: Licheng
authors.initials: L
authors.lastname: Sun