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Photocorrosion-Resistant Sb2Se3 Photocathodes with Earth Abundant MoSx Hydrogen Evolution Catalyst

preprint
submitted on 07.09.2017 and posted on 08.09.2017 by David Tilley, Rajiv Ramanujam Prabhakar, Wilman Septina, Sebastian Siol, Thomas Moehl, René Wick-Joliat

The poor stability of high efficiency photoabsorber materials in aqueous media is one factor holding back the realization of photoelectrochemical (PEC) water splitting for large scale, practical solar fuels generation. Here, we demonstrate that highly efficient thin film Sb2Se3–fabricated by a simple, low temperature selenization of electrodeposited Sb–is intrinsically stable towards photocorrosion in strongly acidic media (1 M H2SO4). Coupling with a photoelectrodeposited MoSx hydrogen evolution catalyst gives high photocurrents (5 mA cm-2 at 0 V vs RHE) and high stability without protective layers (10 h with ~20% loss). A low temperature sulfurization of the Sb2Se3-MoSx stack dramatically improved the onset potential, resulting in high photocurrent densities up to 16 mA cm-2 at 0 V vs RHE. The simplicity with which these photocathodes are fabricated, combined with the high photocurrents and stability, make Sb2Se3 a strong candidate for scalable PEC cells.

Funding

University of Zurich; Swiss National Science Foundation (AP Energy Grant # PYAPP2 160586); COST project IZCNZ0-174856 C16.0075, in the COST Action MP1407 (e-MINDS)

History

Topic

  • Energy Storage

Email Address of Submitting Author

david.tilley@chem.uzh.ch

Institution

University of Zurich

Country

Switzerland

ORCID For Submitting Author

0000-0002-7542-1147

Declaration of Conflict of Interest

None.

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