Model korozije ogljika v gorivni celici s protonsko izmenjevalno membrano

Draković, Filip (author), Katrašnik, Tomaž (mentor)

V gorivni celici pridobivamo električno energijo preko elektrokemičnih reakcij oksidacije in redukcije, ki potekajo na vsaki strani gorivne celice. V gorivni celici s protonsko izmenjevalno membrano membrana selektivno prepušča protone, medtem ko elektroni potujejo po tokokrogu. Poleg potrebnih reakcij za delovanje gorivne celice pa potekajo še reakcije, ki povzročajo njeno degradacijo. Ena izmed teh reakcij je korozija ogljika, ki zmanjšuje učinkovitost delovanja gorivne celice in krajša njeno življenjsko dobo. Ta se pojavlja v elektrodi, sestavni del katere je ogljik. Zaradi kompleksnosti procesov korozije in njenega vpliva na delovanje gorivne celice se pojavlja potreba po napovedovanju korozije ogljika. S tem namenom so izdelani številni matematični modeli. V magistrskem delu je izdelan preprost matematični model korozije ogljika, ki je narejen na osnovi kompleksnejših modelov in eksperimentalnih rezultatov. Pridobljeni rezultati potrjujejo možnost uporabe preprostih modelov za napoved korozije ogljika. Prav tako je na podlagi rezultatov prikazana odvisnost korozije ogljika od električnega potenciala in pokritosti površin s hidroksidi. Prikazani so tudi vplivi različnih parametrov na delovanje modela korozije.

• Language: Slovenian
• Keywords: gorivne celice, protonska izmenjevalna membrana, korozija ogljika, matematični model, spreminjanje električnega potenciala
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [F. Draković]
• Year: 2020
• Number of pages: XXII, 84 str.
• PID: 20.500.12556/RUL-119614
• UDC: 621.352.6:620.193:519.6(043.2)
• COBISS.SI-ID: 29194499
• Publication date in RUL: 10.09.2020

Secondary language

• Language: English
• Title: Carbon corrosion model of proton exchange membrane fuel cell

Abstract

In the fuel cell, we obtain electricity through electrochemical oxidation and reduction reactions that take place on each side of the fuel cell. In a fuel cell with a proton exchange membrane, the membrane selectively releases protons while electrons travel through the circuit. In addition to the necessary reactions for the operation of the fuel cell, there are also reactions that cause its degradation. One of these reactions is carbon corrosion, which reduces the efficiency of the fuel cell and shortens its lifespan. This occurs on carbon in the electrode. Due to the complexity of corrosion processes and its impact on fuel cell performance, there is a need to predict carbon corrosion. For this purpose, numerous mathematical models are developed. A simple mathematical model of carbon corrosion is made in the master’s thesis, which is based on more complex models and experimental results. The obtained results confirm the possibility of using simple models to predict carbon corrosion. The results also confirm the dependence of carbon corrosion on the electric potential and the coverage of surfaces with hydroxides. The influences of different parameters on the operation of the corrosion model are also presented

• Keywords: fuel cells, proton exchange membrane, carbon corrosion, mathematical model, change of electrical potential