A hierarchical nanostructured Pr₆O₁₁ phase, a potential electrocatalyst for the oxygen reduction reaction, is prepared for the first time by electrostatic spray deposition (ESD) on a GDC (Ce_0.9Gd_0.1O_{2 − δ}) electrolyte and evaluated as an Intermediate Temperature Solid Oxide Fuel Cell cathode. Different and innovative microstructures are found to be related to the solvent composition, deposition time, nozzle to substrate distance, substrate temperature and solution flow rate. Single phase Pr₆O₁₁ films crystallize in a Fmm fluorite cubic structure after calcination at 700 °C for 2 h in air. The electrochemical properties are found to be strongly dependent on the microstructure of the cathode films. A symmetrical cell based on the double layer architecture (a columnar-type active layer by ESD topped by a screen-printed current collector) cathode presents a low polarization resistance value of 0.02 Ω cm² at 600 °C. To the best of our knowledge, this Pr₆O₁₁ cathode shows the best performance reported to date for all SOFC cathode materials. A single cell made of a commercial (Ni-3YSZ/Ni-8YSZ/8YSZ/GDC) half cell and this double layer cathode delivers a maximum power density of 500 mW cm⁻² at 700 °C. Moreover, Pr₆O₁₁ does not show any reactivity with GDC over 10 days in air at 800 °C.

中文翻译：

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用于固体氧化物燃料电池 的高效分层纳米结构Pr ₆ O ₁₁电极†

通过在GDC（Ce _0.9 Gd _0.1 O _{2- δ}）电解质上进行静电喷涂（ESD）首次制备了分层的纳米结构Pr ₆ O ₁₁相，它是氧还原反应的潜在电催化剂。温度固体氧化物燃料电池的阴极。发现不同和创新的微观结构与溶剂组成，沉积时间，喷嘴到基材的距离，基材温度和溶液流速有关。单相Pr ₆ O ₁₁薄膜在Fm m中结晶在空气中于700°C煅烧2 h后的萤石立方结构。发现电化学性质在很大程度上取决于阴极膜的微观结构。基于双层结构的对称电池（由ESD制成的柱状有源层，上面加有丝网印刷的集电器）阴极在600°C时具有0.02Ωcm ²的低极化电阻值。据我们所知，这种Pr ₆ O ₁₁阴极显示了迄今为止所有SOFC阴极材料的最佳性能。由商用（Ni-3YSZ / Ni-8YSZ / 8YSZ / GDC）半电池组成的单电池和该双层阴极在700°C时可提供500 mW cm ^-2的最大功率密度。此外，Pr ₆ O ₁₁ 在800°C的空气中，在10天内未与GDC发生任何反应。