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.

可逆质子陶瓷燃料电池 (RePCFC) 的中间工作温度 (~400–600 °C) 允许氨作为碳中性高能量密度燃料和储能介质的潜在用途。在这里，我们展示了具有超致密 (~100%) 和薄 (4 μm) 质子陶瓷电解质层的阳极支撑 RePCFC 的制造。当与新型 Ru-(BaO) ₂ (CaO)(Al ₂ O ₃ ) (Ru-B2CA) 可逆氨催化剂偶联时，在 650 °C 和氨燃料下，最大燃料电池发电量达到 877 mW cm ^{-2 。}我们报告了在 600 °C 下在氨燃料下长达 1250 小时的相对稳定运行。在燃料生产模式下，氨率超过 1.2 × 10 ^-8 NH ₃ mol cm ^-2s ^-1在环境压力下，H ₂仅来自电解，以及 2.1 × 10 ^-6  mol NH ₃ cm ^-2 s ^-1在 12.5 bar 下，H ₂来自电解和模拟循环气体。