Low-Cost, Efficient, and Durable H2 Production by Photoelectrochemical Water Splitting with CuGa3Se5 Photocathodes

Muzzillo, Christopher P.; Klein, W. Ellis; Li, Zhen; DeAngelis, Alexander Daniel; Horsley, Kimberly; Zhu, Kai; Gaillard, Nicolas

doi:10.1021/acsami.8b01447

Title: Low-Cost, Efficient, and Durable H₂ Production by Photoelectrochemical Water Splitting with CuGa₃Se₅ Photocathodes

Journal Article · Wed May 16 00:00:00 EDT 2018 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.8b01447· OSTI ID:1456867

^[1]; Klein, W. Ellis ^[1]; Li, Zhen ^[1]; DeAngelis, Alexander Daniel ^[2]; Horsley, Kimberly ^[2];

^[1]; Gaillard, Nicolas ^[2]

National Renewable Energy Lab. (NREL), Golden, CO (United States)
Univ. of Hawaii, Honolulu, HI (United States)

Photoelectrochemical (PEC) water-splitting is an elegant method of converting sunlight and water into H2 fuel. To be commercially advantageous, PEC devices must become cheaper, more efficient and much more durable. This work examines low-cost polycrystalline chalcopyrite films, which are successful as photovoltaic absorbers, for application as PEC absorbers. In particular, Cu-Ga-Se films with wide band gaps can be employed as top cell photocathodes in tandem devices as a realistic route to high efficiencies. In this report, we demonstrate that decreasing Cu/Ga composition from 0.66 to 0.31 in Cu-Ga-Se films increased the band gap from 1.67 to 1.86 eV and decreased saturated photocurrent density from 18 to 8 mA/cm2 as measured by chopped-light current-voltage (CLIV) measurements in 0.5 M sulfuric acid electrolyte. Buffer and catalyst surface treatments were not applied to the Cu-Ga-Se films, and they exhibited promising stability, evidenced by unchanged CLIV after 9 months of storage in air. Finally, films with Cu/Ga = 0.36 (approximately stoichiometric CuGa3Se5) and 1.86 eV band gaps had exceptional durability, and continuously split water for 17 days (~12 mA/cm2 at -1 V vs. RHE). This is equivalent to ~17200 C/cm2, which is a world record for any polycrystalline PEC absorber. These results indicate that CuGa3Se5 films are prime candidates for cheaply achieving efficient and durable PEC water splitting.

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Research Organization:: National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Hawaii, Honolulu, HI (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC36-08GO28308; EE0006670

OSTI ID:: 1456867

Alternate ID(s):: OSTI ID: 1570462

Report Number(s):: NREL/JA-5K00-71606

Journal Information:: ACS Applied Materials and Interfaces, Vol. 10, Issue 23; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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