Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 21, Pages 11279-11284Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp503743e
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Funding
- Ministerio de Economia y Competitividad
- Ministerio de Educacion y Cultura [MAT2011-27008, AP2010-2748]
- Jaume I University [P1 1B2010-36, P1.1B2011-50]
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Up-conversion (UC) of infrared (IR) photons into visible radiation constitutes a promising strategy to enhance the light harvesting efficiency of photovoltaic and photoelectrochemical devices. In the present study, we integrate Er3+/Yb3+-codoped yttrium oxide (Y2O3) submicrometric particles with outstanding up-conversion properties into mesoporous titanium oxide (TiO2) structures sensitized with cadmium selenide (CdSe) for solar hydrogen generation. We demonstrate that the incorporation of these up-converting particles (UCP) leads to effective H-2 generation with IR photons. Moreover, based on the analysis of the emission lifetimes, we show that the optical interaction between the emitting UCPs and the CdSe absorber occurs via a radiative emission-reabsorption process. The low cost and toxicity and excellent chemical and thermal stability of our UC phosphors allow envisaging them as real candidates for the new generation of long-term photoelectrochemical devices for solar H-2 generation.
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