Panchromatic Solar-to-H2 Conversion by a Hybrid Quantum Dots–Dye Dual Absorber Tandem Device

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• 作者：Victoria González-Pedro ; Isaac Zarazua ; Eva M. Barea ; Francisco Fabregat-Santiago ; Elder de la Rosa ; Iván Mora-Seró ; Sixto Giménez
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：January 16, 2014
• 年：2014
• 卷：118
• 期：2
• 页码：891-895
• 全文大小：277K
• ISSN：1932-7455

文摘

Solution-processed mesoscopic oxide semiconductor-based materials offer potentially low-cost and high stability alternative for next generation of water to hydrogen conversion photoelectrochemical cells (PEC). In the present study, we demonstrate the effective unassisted H₂ generation by a tandem device based on a quantum dot (QD)鈥揹ye dual absorber system. These systems are constituted by a TiO₂ mesoscopic photoanode sensitized with CdS QDs and a dye sensitized solar cell (DSSC), based on ruthenium dye, connected in series. This solar cell supplies the needed photovoltage to induce photodriven hydrogen production. Opto-electrochemical characterization of the single components allows the prediction of the operational photocurrents and a reliable estimation of the theoretical power conversion efficiencies of tandem systems. Evolved hydrogen under simulated solar illumination was collected, and solar to hydrogen conversion efficiencies (STH) were obtained. The tandem devices have demonstrated high stability in aqueous medium and solar-to-hydrogen conversion efficiency of (0.78 卤 0.04)%, near tripling the efficiency of single QD based photoanodes. These results highlight the importance of the design of hybrid photoanodes combining the effect of different light absorbers working in parallel tandem devices for the development of efficient H₂ generation QD-based photoelectrochemical cells.