Abstract
Kinetically sluggish ammonia oxidation and interference of H2 competing with NH3 active sites will suppress the output performance of direct ammonia solid oxide fuel cell (DA-SOFC). Herein, we select Zn2+ doped into Pr2NiO4 as precursor of Pr2Ni1-xZnxO4 (PNZx) that can be destroyed and converted into Pr2O3 together with in-situ Ni reduction, realizing the redistribution of elements in reduction atmosphere. Meanwhile, the foreign Zn2+ as a low-valent element is retained in Pr2O3 lattice due to the high segregation Gibbs free energy to form Ni/Pr2-xZnxO3, which aggravates the change of Pr3+ and Pr4+, thus enhancing the oxygen vacancy concentration. The Zn2+ promotes the reduction of Ni and quenches the adsorption capacity of H2, alleviating the “hydrogen poisoning” behavior. As a result, the maximum powder density of single cell based on PNZ0.1 supported by YSZ electrolyte is 134 mW·cm−2 at 800 ℃, which is more than twice higher than that of Ni/YSZ. Various characterizations reveal that the NH3 reaction path is the synergistic occurrence of ammonia decomposition and ammonia oxidation.
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