Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 4, Pages 1561-1570Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp306954y
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Funding
- Ministerio de Ciencia e Innovation of Spain [HOPE CSD2007-00007, CTQ2009-10477]
- Ramon y Cajal Programme
- Junta de Andalucia [P06-FQM-01869, P07-FQM-02595, P07-FQM-02600]
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The effect of reductive electrochemical doping of nanocrystalline TiO2 electrodes on their photoelectrocatalytic properties and their performance in dye-sensitized solar cells is studied. It is observed that accumulation of negative charge (compensated by proton insertion from the supporting electrolyte) leads to a photocurrent increase for water oxidation. Furthermore, an enhanced photoconversion efficiency in dye-sensitized solar cells is observed for the doped electrodes with respect to the unmodified ones. The effect has been analyzed using small-perturbation electrochemical techniques (impedance spectroscopy, intensity-modulated photovoltage, and photocurrent spectroscopy). The results indicate that the better photoelectrocatalytic and photovoltaic efficiency is due to a more rapid electron transport combined with reduced recombination, contributing to improved electron collection. Furthermore, an enhancement in electron injection is also inferred from the analysis of the present results.
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