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Ammonia-fed reversible protonic ceramic fuel cells with Ru-based catalyst
Communications Chemistry  (IF6.581),  Pub Date : 2021-08-17, DOI: 10.1038/s42004-021-00559-2
Zhu, Liangzhu, Cadigan, Chris, Duan, Chuancheng, Huang, Jake, Bian, Liuzhen, Le, Long, Hernandez, Carolina H., Avance, Victoria, O’Hayre, Ryan, Sullivan, Neal P.

The intermediate operating temperatures (~400–600 °C) of reversible protonic ceramic fuel cells (RePCFC) permit the potential use of ammonia as a carbon-neutral high energy density fuel and energy storage medium. Here we show fabrication of anode-supported RePCFC with an ultra-dense (~100%) and thin (4 μm) protonic ceramic electrolyte layer. When coupled to a novel Ru-(BaO)2(CaO)(Al2O3) (Ru-B2CA) reversible ammonia catalyst, maximum fuel-cell power generation reaches 877 mW cm−2 at 650 °C under ammonia fuel. We report relatively stable operation at 600 °C for up to 1250 h under ammonia fuel. In fuel production mode, ammonia rates exceed 1.2 × 10−8 NH3 mol cm−2 s−1at ambient pressure with H2 from electrolysis only, and 2.1 × 10−6 mol NH3 cm−2 s−1 at 12.5 bar with H2 from both electrolysis and simulated recycling gas.