A Mechanistic Understanding of Solid Oxide Fuel Cell Chemistry through In-Situ Raman Spectroscopy

摘要

Raman spectroscopy has been used in-situ to characterize graphitic intermediates formed by hydrocarbons fuels on porous Ni/YSZ SOFC anodes. Low molecular weight (MW), carbon containing fuels and fuel mixtures were chosen to isolate (and mimic) the contributions to SOFC performance from various species that form when higher MW species such as C_4H_(10) undergo gas-phase pyrolysis prior to reaching SOFC anodes. Raman spectra of all mixtures display peaks at 1570 cm~(-1) and 1345 cm~(-1), assigned to the graphite G and D peaks, respectively. The D peak intensity is indicative of the amount of structural disorder in the graphite on the surface. A trend of increasing disorder with higher MW fuels mixes is observed. The electrochemical behavior of cells operated with C_4H_(10) is duplicated when fuel mixtures contain ethylene and propylene.