Tungsten Oxide-Coated Copper Gallium Selenide Sustains Long-Term Solar Hydrogen Evolution

David Palm, Christopher Muzzillo, Micha Ben-Naim, Imran Khan, Nicolas Gaillard, Thomas Jaramillo

Research output: Contribution to journalArticlepeer-review

11 Scopus Citations


This work demonstrates that ultrathin (4 nm) tungsten oxide (WO3) coatings on copper gallium selenide (CuGa3Se5) photocathodes have the potential for long-term solar hydrogen evolution. With a combination of a robust 1.84 eV CuGa3Se5 absorber layer, a WO3 protective coating, and a Pt catalyst, we obtain a new durability milestone for any non-silicon photoelectrochemical hydrogen-producing device by passing 21 490 C cm-2 of charge across six weeks of continuously-illuminated chronoamperometric testing under applied bias.

Original languageAmerican English
Pages (from-to)384-390
Number of pages7
JournalSustainable Energy and Fuels
Issue number2
StatePublished - 21 Jan 2021

Bibliographical note

Publisher Copyright:
© 2021 The Royal Society of Chemistry.

NREL Publication Number

  • NREL/JA-5K00-78194


  • hydrogen
  • photoelectrochemical
  • water splitting


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