Designing Active and Stable Silicon Photocathodes for Solar Hydrogen Production Using Molybdenum Sulfide Nanomaterials. Issue 18 (8th August 2014)

• Record Type: Journal Article
• Authors: Benck, Jesse D.; Lee, Sang Chul; Fong, Kara D.; Kibsgaard, Jakob; Sinclair, Robert; Jaramillo, Thomas F.
• Is Part Of: Advanced energy materials. Volume 4:Issue 18(2014)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2014-08-08
• Subjects: Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201400739
• Languages: English
• ISSNs: 1614-6832

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Silicon is a promising photocathode for tandem photoelectrochemical water splitting devices, but efficient catalysis and long term stability remain key challenges. Here, it is demonstrated that with appropriately engineered interfaces, molybdenum sulfide nanomaterials can provide both corrosion protection and catalytic activity in silicon photocathodes. Using a thin MoS₂ surface protecting layer, MoS₂‐n⁺p Si electrodes that show no loss in performance after 100 h of operation are created. Transmission electron microscopy measurements show the atomic structure of the device surface and reveal the characteristics of the MoS₂ layer that provide both catalytic activity and excellent stability. In spite of a low concentration of exposed catalytically active sites, these electrodes possess the best performance of any precious metal‐free silicon photocathodes with demonstrated long term stability to date. To further improve efficiency, a second molybdenum sulfide nanomaterial, highly catalytically active [Mo₃S₁₃]²⁻ clusters, is incorporated. These photocathodes offer a promising pathway towards sustainable hydrogen production.</p> </abstract>