Jump to main content
Jump to site search


Development of highly efficient CuIn0.5Ga0.5Se2-based photocathode and application to overall solar driven water splitting

Author affiliations

Abstract

A CuIn1−xGaxSe2 (CIGS) photocathode having a specific composition exhibited remarkable promotion of hydrogen evolution from water, with a half-cell solar-to-hydrogen conversion efficiency of 12.5%. CIGS thin films with various compositions (defined by x = Ga/(In + Ga)) were prepared via a three-stage method employing a vacuum evaporation system. The photocurrent from CIGS photocathode surfaces modified with CdS and Pt (Pt/CdS/CIGS) significantly increased along with x as a result of a reduction in the conduction band offset at the CIGS/CdS interface. Using an optimized aqueous electrolyte resulted in enhanced photocurrents of 28 and 18 mA cm−2 at 0 and 0.6 VRHE, respectively, under simulated AM1.5G sunlight. A tandem-type PEC cell containing the newly developed CIGS photocathode and a BiVO4 semi-transparent photoanode demonstrated stoichiometric hydrogen and oxygen evolution with a solar-to-hydrogen conversion efficiency of 3.7% without the application of an external bias voltage.

Graphical abstract: Development of highly efficient CuIn0.5Ga0.5Se2-based photocathode and application to overall solar driven water splitting

Back to tab navigation

Supplementary files

Publication details

The article was received on 19 Jun 2018, accepted on 31 Jul 2018 and first published on 31 Jul 2018


Article type: Paper
DOI: 10.1039/C8EE01783B
Citation: Energy Environ. Sci., 2018, Advance Article
  •   Request permissions

    Development of highly efficient CuIn0.5Ga0.5Se2-based photocathode and application to overall solar driven water splitting

    H. Kobayashi, N. Sato, M. Orita, Y. Kuang, H. Kaneko, T. Minegishi, T. Yamada and K. Domen, Energy Environ. Sci., 2018, Advance Article , DOI: 10.1039/C8EE01783B

Search articles by author

Spotlight

Advertisements