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Issue 14, 2016
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Optimized light-driven electrochemical water splitting with tandem polymer solar cells

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Abstract

Tandem polymer solar cells are used for light-driven electrochemical water splitting. To attain a high enough electrochemical potential a new wide band gap electron donor polymer (PTPTIBDT-OD) is developed and used in combination with [70]PCBM as an electron acceptor in a tandem device architecture with two identical photoactive layers. This homo-tandem device comprises an intermediate ZnO/PEDOT:PSS/MoO3 charge recombination layer to connect the two subcells electrically and optically. The homo-tandem solar cell has an open-circuit voltage of 1.74 V and reaches a power conversion efficiency (PCE) of 5.3%. In combination with RuO2 as the electrocatalyst for oxygen evolution and RuO2 or Pt catalysts for hydrogen evolution, sunlight-driven electrochemical water splitting occurs with a solar-to-hydrogen conversion efficiency of ηSTH = 4.3%. Owing to the very high fill factor of the polymer tandem cell (0.73), water splitting takes place near the maximum power point of the homo-tandem solar cell. As a consequence, the difference between PCE and ηSTH is only due to the overpotential losses.

Graphical abstract: Optimized light-driven electrochemical water splitting with tandem polymer solar cells

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Publication details

The article was received on 20 des. 2015, accepted on 03 mar. 2016 and first published on 03 mar. 2016


Article type: Paper
DOI: 10.1039/C5TA10459A
Citation: J. Mater. Chem. A, 2016,4, 5107-5114
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    Optimized light-driven electrochemical water splitting with tandem polymer solar cells

    S. Esiner, G. W. P. van Pruissen, M. M. Wienk and R. A. J. Janssen, J. Mater. Chem. A, 2016, 4, 5107
    DOI: 10.1039/C5TA10459A

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