A holistic approach to fully characterize the physical–chemical properties of N doped TiO2 and evaluate its true impact on photoelectrochemical applications.

This work consists of the study and development of a hybrid lighting system that uses Led as artificial light source and sunlight as a natural source. Starts with a survey of this technology being developed in the tubular lighting system as well as the search for its replacement by alternative materials as a way to fund the project, uniting quality and reduced cost. With the definition of constructive elements, proceeds to the beginning of project design and development of control to maintain brightness in the environment system. Using as guidance the Brazilian Standards, which govern the methods of measuring brightness, as well as the procedure for creating models scaled tools. Finally presents the tests and their results, demonstrating the possibility of developing a hybrid lighting system at low cost.

Direct Ethanol Fuel Cells DEFCs are considered one of the promising renewable energy sources, as they can produce electrical energy directly from the ethanol electrooxidation reaction. The efficiency of ethanol electrooxidation is a big question from research point of view. In this work, Pd is used as catalyst for the electrooxidation in alkaline media aiming to improve the catalytic activity for ethanol electrooxidation reaction, and consequently the DEFC performance, more than using a Pt-based catalyst. In this research, Pd was used as an alternative for Pt-based catalyst. Additionally, it can be recorded that the alloying of Pd with Sn will enhance the efficiency through increasing the surface area of the PdSn catalysts.