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Engineering n-p junction for photo-electrochemical hydrogen production.

Résumé : The generation of hydrogen from water and sunlight offers a promising approach for producing scalable and sustainable carbon free fuels. One of the challenges of solar-to-fuel technology is the design of efficient, long-lasting and low-cost photocathodes, which are responsible for absorbing sunlight and driving catalytic hydrogen evolution. We report on the protection of a Cu/Cu2O/CuO photoelectrode against photocorrosion by a 200-300 nm-thick BaTiO3 perovskite layer, deposited using the sol-gel method. This photoelectrode mediates H2 production with a current density of ∼3.1 mA cm-2 at 0 V versus RHE under 3 Sun irradiation and in a pH = 6 aqueous electrolyte. While the unprotected Cu/Cu2O/CuO photoelectrodes show a rapid decay of activity, the BaTiO3-protected photoelectrodes exhibit ∼10% current decay over 20 min.
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Submitted on : Wednesday, November 29, 2017 - 3:31:12 PM
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Toupin J., H. Strub, S. Kressmann, M. Boudot, V. Artero, et al.. Engineering n-p junction for photo-electrochemical hydrogen production.. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2017, 45 (19), pp.30675-30682. ⟨10.1039/c7cp05122k⟩. ⟨hal-01651826⟩

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