Publication date: 15th December 2014
Photoelectrochemical generation of fuels with semiconductor materials offers a versatile strategy to efficiently capture and store the solar energy. Organic photoactive materials appear as promising candidates for the generation of solar fuels in terms of efficiency and cost. However, the low stability in aqueous media appears to be the main critical issue to be solved. In the present study, we develop stable organic photocathodes for the generation of hydrogen in aqueous media. The device design relies on the use of the adequate protection of the photoactive layer by the deposition of a thick electron selective layer of TiOx/Pt in contact with the aqueous solution. The role of the TiOx nanoparticles is to electrically communicate the organic layer with the hydrogen evolving catalyst (Pt). Tuning the thickness of the TiOx/Pt layer leads to a trade-off between achievable photocurrent and the stability of the photocathode. Maximum photocurrents of ~1 mAcm-2 at -0.1 V vs RHE are obtained using a thin layer of TiOx/Pt (50 nm). The increase of the TiOx/Pt (~140 nm) film thickness leads to stable 1.6 µmol h-1cm-2 hydrogen generation at 0 V vs RHE. We believe that the results of his study pave the way towards the use of stable organic photoelectrochemical cells for hydrogen generation.
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