Molybdenum Disulfide as a Protection Layer and Catalyst for Gallium Indium Phosphide Solar Water Splitting Photocathodes

Todd Deutsch, James Young, Reuben Britto, Jesse Benck, Christopher Hahn, Thomas Jaramillo

Research output: Contribution to journalArticlepeer-review

76 Scopus Citations

Abstract

Gallium indium phosphide (GaInP2) is a semiconductor with promising optical and electronic properties for solar water splitting, but its surface stability is problematic as it undergoes significant chemical and electrochemical corrosion in aqueous electrolytes. Molybdenum disulfide (MoS2) nanomaterials are promising to both protect GaInP2 and to improve catalysis because MoS2 is resistant to corrosion and also possesses high activity for the hydrogen evolution reaction (HER). In this work, we demonstrate that GaInP2 photocathodes coated with thin MoS2 surface protecting layers exhibit excellent activity and stability for solar hydrogen production, with no loss in performance (photocurrent onset potential, fill factor, and light-limited current density) after 60 h of operation. This represents a 500-fold increase in stability compared to bare p-GaInP2 samples tested in identical conditions.

Original languageAmerican English
Pages (from-to)2044-2049
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume7
Issue number11
DOIs
StatePublished - 2 Jun 2016

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-66114

Keywords

  • photoelectrochemical water splitting
  • semiconductor photocorrosion

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