Abstract The cathode in a molten carbonate fuel cell (MCFC) was made using the tape casting method from a slurry with a suitable chemical composition consisting of porogen, allowing it to achieve a porous structure. Currently used porogens in creating cathode structures are synthetic polymers, which release hazardous substances into the environment during thermal removal. Therefore, it is very important to find a safer alternative before industrial production of fuel cells begins and reduce its impact on the environment. The research aimed to analyze the possibility of using various porogens to obtain a fuel cell's cathode microstructure and compare them to a reference cathode. The electrodes were produced using cheap, accessible, and natural porogens. Chosen porogens were post-production waste materials such as wheat straw, hemp, and beet pulp. They were used solo or coupled to create the cathode of MCFC, thoroughly characterized in the context of morphology, structure, and chemical composition. After optimization, final MCFC cathodes were characterized by SEM, Archimedes porosimetry, gas porosimetry, and gas permeability. The highest power density (100 mW/cm2) was obtained for the cathode, which was made with starch and straw, while starch and PVB enabled the achievement of 90 mW/cm2 of the MCFC cathode.