title: Light-induced water oxidation at silicon electrodes functionalized with a cobalt oxygen-evolving catalyst.
abstract: Integrating a silicon solar cell with a recently developed cobalt-based water-splitting catalyst (Co-Pi) yields a robust, monolithic, photo-assisted anode for the solar fuels process of water splitting to O(2) at neutral pH. Deposition of the Co-Pi catalyst on the Indium Tin Oxide (ITO)-passivated p-side of a np-Si junction enables the majority of the voltage generated by the solar cell to be utilized for driving the water-splitting reaction. Operation under neutral pH conditions fosters enhanced stability of the anode as compared to operation under alkaline conditions (pH 14) for which long-term stability is much more problematic. This demonstration of a simple, robust construct for photo-assisted water splitting is an important step towards the development of inexpensive direct solar-to-fuel energy conversion technologies.
authors.affiliation: Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA.
authors.forename: Joep J H
authors.initials: JJ
authors.lastname: Pijpers
authors.forename: Mark T
authors.initials: MT
authors.lastname: Winkler
authors.forename: Yogesh
authors.initials: Y
authors.lastname: Surendranath
authors.forename: Tonio
authors.initials: T
authors.lastname: Buonassisi
authors.forename: Daniel G
authors.initials: DG
authors.lastname: Nocera