An efficient and durable anode for ammonia protonic ceramic fuel cells

Ammonia protonic ceramic fuel cells (PCFCs) have the potential to be a highly efficient power source with high energy density. However, the inadequate catalytic activity of the existing anodes for utilization of ammonia greatly limits the performance of PCFCs. Here we report an Fe-modified state-of-the-art Ni cermet anode with greatly enhanced activity and durability toward utilization of ammonia. Cells with an Fe-decorated Ni-BaZr0.1Ce0.7Y0.1Yb0.1O3 (Ni-BZCYYb) anode demonstrate an excellent performance, achieving peak power densities of 0.360, 0.723, 1.257, and 1.609 W cm(-2) at 550, 600, 650, and 700 degrees C, respectively, which reveal the highest performance of solid oxide fuel cells fueled on ammonia. In addition, the cells show an excellent durability when operated at a constant current density of 0.5 A cm(-2) (or a power density of similar to 0.435 W cm(-2)) at 650 degrees C. The superior activity and durability of the Fe-modified Ni/BZCYYb anode are attributed to the alternation of NH3 adsorption strength and N-2 desorption barrier heights, as confirmed by first-principles based mechanistic and microkinetic modeling. Our research provides a valuable guidance for the development of efficient electro-catalysts for ammonia PCFCs.

Automated summary

Ammonia protonic ceramic fuel cells (PCFCs) have the potential to be a highly efficient power source with high energy density, but the catalytic activity of existing anodes for ammonia utilization is inadequate. This study presents an Fe-modified Ni/BZCYYb anode with enhanced activity and durability, providing valuable guidance for the development of efficient electro-catalysts for ammonia PCFCs.