Tungsten oxide-coated copper gallium selenide sustains long-term solar hydrogen evolution

Authors
David W. Palm,
Christopher P. Muzzillo,
Micha Ben-Naim,
Imran Khan,
Nicolas Gaillard,
Thomas F. Jaramillo
Year of publication
2021
Journal
Sustainable Energy Fuels
Volume
5
Starting page
384
Ending page
390
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.
Funding sources