Abstract
Ammonia produced using renewable hydrogen is being viewed as a promising media for the export of energy from locations rich in renewable energy sources. Solid oxide fuel cells (SOFCs) are efficient devices for converting such exported ammonia back into electricity at the point of use; however, investigations on materials and operating regimes for direct ammonia fuelled SOFCs are limited. In this work, we evaluated the direct ammonia SOFC performance with a Silver-Lanthanum Strontium Cobalt Ferrite (Ag-LSCF) composite anode and a novel Palladium (Pd) nanoparticle decorated Silver-Lanthanum Strontium Cobalt Ferrite (Pd-Ag-LSCF) composite anode in the temperature range of 500 °C to 800 °C. It is hypothesised that palladium nanoparticles in the anode provide hydrogen dissolution and shift the ammonia decomposition reaction towards the right. The cell performance was evaluated with both hydrogen and ammonia as fuels and a clear-cut improvement in the performance was observed with the addition of Pd for both the fuels. The results showed performance enhancements of 20% and 43% with hydrogen and ammonia fuels, respectively, from the addition of Pd to the Ag-LSCF anode. Open-circuit voltage (OCV) values of the cells with hydrogen and ammonia fuels recorded over the temperature range of 500 °C to 800 °C indicated the possibility of direct electro-oxidation of ammonia in SOFCs.
Highlights
IntroductionA substantial decrease in the levelised cost of renewable electricity production has been observed over the past decade due to advances in engineering and increased market penetration of solar and wind power electricity generators
We report a response of planar Solid oxide fuel cells (SOFCs) with an a Silver-Lanthanum Strontium Cobalt Ferrite (Ag-LSCF) composite anode for ammonia fuel
Planar cells with the composite electrodes Ag-LSCF and Pd-Ag-LSCF were evaluated for direct ammonia fuel cell application
Summary
A substantial decrease in the levelised cost of renewable electricity production has been observed over the past decade due to advances in engineering and increased market penetration of solar and wind power electricity generators. Despite these advances, the actual penetration of nonhydro related renewables remains limited due to the uneven distribution of renewables and their inherent intermittency. The actual penetration of nonhydro related renewables remains limited due to the uneven distribution of renewables and their inherent intermittency In response to these challenges, the avenues for long-term energy storage and transport in the form of different chemicals and fuels are being explored.
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