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Co-sensitized TiO2 electrodes with different quantum dots for enhanced hydrogen evolution in photoelectrochemical cells

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Abstract

A comparative study of hydrogen evolution in devices based on cadmium chalcogenides quantum dots (CdS, CdSe and CdTe) and its combinations, sensitizing TiO2 was carried out. A maximum photocurrent of 2.7 mA cm−2 at 0 V bias, and a solar-to-hydrogen (STH) conversion efficiency of 0.9%, was obtained with CdSe QDs due to its wide absorption range. The co-sensitized device with CdS–CdSe QDs showed a higher photocurrent of 3.9 mA cm−2 with an STH of 1.2%. The improvement in hydrogen generation for electrodes sensitized with CdS in combination with CdSe or CdTe QDs, was attributed to the increased light absorption and appropriate band alignment for the enhanced charge transport.

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Acknowledgements

We acknowledge financial support to CONACYT through Grant 259192 and CEMIE-Solar (207450) consortium projects P27 and P28. A. Cerdán-Pasarán acknowledges to CONACYT for the Doctoral fellowship. We thank to Christian Albor for technical support.

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Authors and Affiliations

  1. Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León, Cd. Universitaria, C.P. 66451, San Nicolás de los Garza, Nuevo León, Mexico

    Andrea Cerdán-Pasarán & K. C. Sanal

  2. Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Edificio U, Ciudad Universitaria, 58030, Morelia, Michoacan, Mexico

    Tzarara López-Luke

  3. Departamento de Ciencias Exactas y Tecnología, Lagos de Moreno, Universidad de Guadalajara, Centro Universitario de Los Lagos, 47460, Jalisco, Mexico

    Isaac Zarazúa

  4. División de Ciencias Naturales y Exactas, Universidad de Guanajuato, Noria Alta s/n, 36050, Guanajuato, GTO, Mexico

    Rosalba Fuentes-Ramírez & Alejandro Alatorre-Ordaz

  5. Universidad De La Salle Bajio, Campus Campestre, 37150, León, GTO, Mexico

    Elder De la Rosa

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  1. Andrea Cerdán-Pasarán
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Cerdán-Pasarán, A., López-Luke, T., Zarazúa, I. et al. Co-sensitized TiO2 electrodes with different quantum dots for enhanced hydrogen evolution in photoelectrochemical cells. J Appl Electrochem 49, 475–484 (2019). https://doi.org/10.1007/s10800-019-01299-x

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