Browsing by Author "Martínez, Carola"

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    Analysis of the microstructure and electrochemical properties of Cu-NiAl used for molten carbonate fuel cell
    (2024) Arcos Segura, Camila Fernanda; Sancy, Mamié; Martínez, Carola; Pontificia Universidad Católica de Chile. Escuela de Ingeniería
    Global population growth has influenced further technological and scientific challenges, where the exponential increase in electricity demand stands out. In this context, it is necessary to continue researching alternatives to conventional energy generation to reduce greenhouse emissions. Fuel Cell technology is promising for lowering and storing carbon dioxide emissions in this context. It is a backup system to avoid intermittent problems with wind, solar, or other technologies. Fuel cells correspond to an electrochemical device that converts the chemical energy of a fuel directly into electrical energy. Their main components are the electrodes (anode and cathode), electronically conductive, and electrolyte. In particular, molten carbonate fuel cells use hydrogen as fuel, highlighting their excellent power. However, the high working temperature, close to 650 °C, is a disadvantage due to the reduction of the component’s lifetime. Therefore, for a long-term operation, electrode corrosion behavior must be considered. This thesis aims to study Cu-Ni-Al alloys' microstructure and electrochemical behavior for molten carbonate fuel cells. The metal samples were manufactured using powder metallurgical techniques, such as hot pressing and additive manufacturing. The porosity was analyzed using the Archimedes method. The micro-macrostructure of the samples will be studied before and after exposure to Li2CO3-K2CO3 at 550 °C using surface analysis, such as optical microscopy, field emission scanning electron microscopy, and X-ray diffraction. Moreover, gravimetric measurements before and after exposure and electrochemical impedance spectroscopy at open circuit potential were used to analyze the corrosion of the anodes in an aerated and controlled environment.
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    Evolution of oxide film on the internal porosity of Ti-30Nb-13Ta-2Mn alloy foam
    (2018) Guerra Figueroa, Carolina Andrea; Sancy, Mamié; Walczak, Magdalena; Silva, Daniela; Martínez, Carola; Tribollet, Bernard; Aguilar González, Claudio
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    Improving the interaction between aluminum surfaces and polymer coatings
    (2019) Muñoz, Lisa; Pineda Parra, Fabiola Makarena; Martínez, Carola; Sancy, Mamié; Urzúa, Marcela; Flores, Marcos; Encinas, María V.; Paez, Maritza A.