Developing efficient anode catalysts for direct ammonia solid oxide fuel cells

Pyrochlore La2Zr2–xNixO7 anodes for direct ammonia solid oxide fuel cells
Synthesis and utilization of green ammonia. Credit: Frontiers in Energy (2024). DOI: 10.1007/s11708-024-0948-2

The quest for efficient and clean energy sources has led to the exploration of ammonia as a hydrogen carrier due to its high hydrogen content, energy density, and ease of liquefaction. Solid oxide fuel cells (SOFCs) are highly efficient electrochemical devices that can utilize fuels like hydrogen and hydrocarbons. However, the storage and transportation of hydrogen pose significant challenges due to its low bulk density and boiling point.

Ammonia-based SOFCs offer a promising alternative, and optimizing their performance at intermediate temperatures is a key area of interest.

A research group led by Fulan Zhong and Yu Luo from Fuzhou University focused on the development of pyrochlore La2Zr2–xNixO7+δ (LZNx) oxides as anode catalysts for NH3-SOFCs.

The team investigated the effects of Ni2+ doping on the crystal structure, surface morphology, thermal matching with Yttria-stabilized zirconia (YSZ), conductivity, and electrochemical performance of these oxides.

The study is published in Frontiers in Energy.

The LZNx oxides were found to exhibit n-type semiconductor behavior with excellent high-temperature chemical compatibility and thermal matching with the YSZ electrolyte. Additionally, LZN0.05 demonstrated the smallest conductive band potential and bandgap, leading to a higher power density as anode material for NH3-SOFCs.

The LZN0.05-40YSZ composite anode achieved a maximum power density of 100.86 mW/cm2 at 800 °C, which is 1.8 times greater than that of NiO-based NH3-SOFCs under identical conditions. Moreover, the LZN0.05-40YSZ composite anode showed negligible voltage degradation after continuous operation at 800 °C for 100 h, indicating its extended durability.

The development of LZNx anodes addresses a critical need for efficient anode catalysts in NH3-SOFCs, offering a significant step forward in the support of the hydrogen economy through ammonia utilization.

The improved conductivity and electrochemical performance, coupled with the demonstrated durability, suggest that these materials could play a pivotal role in the future of clean energy generation.

More information:
Shiqing Yang et al, Pyrochlore La2Zr2–xNixO7 anodes for direct ammonia solid oxide fuel cells, Frontiers in Energy (2024). DOI: 10.1007/s11708-024-0948-2

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Frontiers Journals

Developing efficient anode catalysts for direct ammonia solid oxide fuel cells (2024, June 7)
retrieved 8 June 2024
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