In situ catalyzed Boudouard reaction of coal char for solid oxide-based carbon fuel cells with improved performance

• Industrial coal char was used as a fuel for solid oxide-based carbon fuel cells.
• The Boudouard reactivity of coal char is higher than that of a commercial activated carbon.
• The mineral matter in coal char has a catalytic effect on the Boudouard reaction.
• Added catalysts and the inherent catalysts synergetically improved cell output.

The use of industrial coal char as a fuel source for an anode-supported solid oxide-based carbon fuel cell (SO-CFC) with a yttrium-stabilized zirconia electrolyte and La0.8Sr0.2MnO3 cathode was investigated. Both the Boudouard reactivity and electrochemical performance of the coal char samples are higher than those of activated carbon samples under the same conditions. The inherent catalytic activity of the metal species (FemOn, CaO, etc.) in the coal char mineral matter leads to good cell performance, even in the absence of an external catalyst. For example, the peak power density of a cell fueled with pure coal char is 100 mW cm−2 at 850 °C, and that of a cell fueled with coal char impregnated with an FemOn-alkaline metal oxide catalyst is 204 mW cm−2. These results suggest that using coal char as the fuel in SO-CFCs might be an attractive way to utilize abundant coal resources cleanly and efficiently, providing an alternative for future power generation.