Abstract Ni-CeO2 composites with CeO2 of different morphologies (nanorods and nanocubes) are prepared and used as the hydrogen electrode of reversible solid oxide cells (RSOCs). Ni-CeO2 nanorods have larger surface area and more surface oxygen than Ni-CeO2 nanocubes. When the RSOCs are used as solid oxide fuel cells (SOFC), the maximum power densities (Pmax) of the cells with Ni-CeO2 nanorods and Ni-CeO2 nanocubes as the anodes are 530.5 and 390.2 mW cm−2, respectively, at 700 °C with H2 as the fuel. The superficial diffusion of adsorbed H atom on Ni-CeO2 composites anode is the rate-determining step (RDS) for H2 electrochemical oxidation reaction and the diffusion rate of the hydrogen atoms adsorbed on Ni-CeO2 nanorods are larger than that of hydrogen atoms adsorbed on Ni-CeO2 nanocubes. Furthermore, when the RSOCs are used as solid oxide electrolysis cells (SOECs), the electrolysis performances of the cell with Ni-CeO2 nanorods as the hydrogen electrode are better than those of the cell with Ni-CeO2 nanocubes as the hydrogen electrode at 700 °C under various H2O concentrations.

中文翻译：

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CeO2形貌对可逆固体氧化物电池电化学性能的影响

摘要 制备了具有不同形貌（纳米棒和纳米立方体）的CeO2 的Ni-CeO2 复合材料，并将其用作可逆固体氧化物电池（RSOCs）的氢电极。Ni-CeO2 纳米棒比 Ni-CeO2 纳米立方体具有更大的表面积和更多的表面氧。当 RSOC 用作固体氧化物燃料电池 (SOFC) 时，以 Ni-CeO2 纳米棒和 Ni-CeO2 纳米立方体为阳极的电池在 700 时的最大功率密度 (Pmax) 分别为 530.5 和 390.2 mW cm-2。 °C，以 H2 为燃料。Ni-CeO2 复合阳极上吸附的 H 原子的表面扩散是 H2 电化学氧化反应的限速步骤 (RDS)，吸附在 Ni-CeO2 纳米棒上的氢原子的扩散速率大于吸附在其上的氢原子的扩散速率。 Ni-CeO2 纳米立方体。此外，