The performance of reversible protonic ceramic electrochemical cells (R-PCECs) was significantly limited, due to lack of suitable air electrode materials specifically designed to match proton conducting electrolyte. Here, we report by doping a small amount of magnesium (5 %), a phase-pure triple conducting Ba(Co_0.4Fe_0.4Zr_0.1Y_0.1)_0.95Mg_0.05O_3-δ (BCFZYM) perovskite is developed as an air electrode for R-PCECs. The doping of 5 % Mg effectively enhances oxygen/steam surface exchange, oxygen-ion and proton conductivity, consequently significantly improves catalytic oxygen reduction and evolution reactions (ORR/OER) activities over protonic electrolytes. R-PCECs with the BCFZYM display excellent performances in both fuel cell (850 mW cm^-2 at 600 °C) and electrolysis modes (−1244 mA cm^-2 at 1.3 V at 600 °C). In addition, the R-PCECs show favorable stability in cycling (110 h), electrolysis (200 h) and fuel cell modes (300 h), demonstrating that BCFZYM air electrode has excellent operating stability.

由于缺乏专门设计用于匹配质子导电电解质的合适空气电极材料，可逆质子陶瓷电化学电池 (R-PCEC) 的性能受到显着限制。在这里，我们通过掺杂少量的镁（5%）报道了一种纯相三导电 Ba(Co _0.4 Fe _0.4 Zr _0.1 Y _0.1 ) _0.95 Mg _0.05 O _3-δ(BCFZYM) 钙钛矿被开发为 R-PCEC 的空气电极。5% Mg 的掺杂有效地增强了氧/蒸汽表面交换、氧离子和质子电导率，从而显着提高了质子电解质的催化氧还原和析出反应 (ORR/OER) 活性。带有 BCFZYM 的 R-PCEC 在燃料电池（850 mW cm ^-2 at 600 °C）和电解模式（-1244 mA cm ^-2 at 1.3 V at 600 °C）中均表现出优异的性能。此外，R-PCECs在循环（110小时）、电解（200小时）和燃料电池模式（300小时）中表现出良好的稳定性，表明BCFZYM空气电极具有优异的运行稳定性。