1 This article was published in Journal of Power Sources, 272, 567-580, 2014 http://dx.doi.org/10.1016/j.jpowsour.2014.08.108 Temperature effect on water splitting using a Si-doped hematite photoanode Paula Dias, Tânia Lopes, Luísa Andrade, Adélio Mendes* LEPABE - Faculdade de Engenharia, Universidade do Porto, rua Dr. Roberto Frias, 4200-465 Porto, Portugal * Corresponding author: e-mail: mendes@fe.up.pt Abstract The influence of temperature on the performance of a photoelectrochemical (PEC) cell prepared with Si-doped hematite photoanode was studied for water splitting. The cell performance was characterized by photocurrent-voltage (J-V) characteristic curves and electrochemical impedance spectroscopy at different cell operating temperatures, from 25 ºC to 65 ºC. A standard three-electrode configuration comprehending the photoelectrode of hematite, the counter- electrode of pure platinum wire (99.9 %) and the reference electrode of Ag/AgCl/Sat.KCl was used. The identification of possible degradation pathways was addressed. It was observed that the generated photocurrent-density