CO₂ methanation is gaining renewed attention due to the emerging application needs such as the power-to-gas concept and long-term space exploration missions. Maximizing the amounts of interfacial sites generally regarded as the efficient active sites is considered to be one of the most direct means to enhance catalytic activity but few breakthroughs have been made. Here, Eu³⁺ is introduced to Ni/CeO₂ to promote the Ni-CeO₂ interaction, resulting in a remarkable low-temperature CO₂ methanation activity. Structural characterization indicates that the Ni/CeEu(9:1) catalyst achieves higher Ni dispersion compared to Ni/CeO₂, which consequently generates more interfacial sites. More interfacial sites enhance the proportions of bidentate carbonates closer to interfacial sites as a faster hydrogenated species during the catalytic process, leading to enhanced low-temperature CO₂ methanation activity over the Ni/CeEu(9:1) catalyst. This work provides a chemical strategy to enhance the amounts of active sites and bring insights into the origin of enhanced catalytic performance.

由于新出现的应用需求（例如电转气概念和长期太空探索任务），CO _{2甲烷化正在获得新的关注。}最大化通常被认为是有效活性位点的界面位点的数量被认为是提高催化活性的最直接手段之一，但几乎没有取得突破。在这里，将Eu ³⁺引入Ni/CeO ₂以促进Ni-CeO ₂相互作用，从而产生显着的低温CO ₂甲烷化活性。结构表征表明，与 Ni/CeO _{2相比，Ni/CeEu(9:1) 催化剂实现了更高的 Ni 分散度}，从而产生更多的界面站点。在催化过程中，更多的界面位点提高了更接近界面位点的二齿碳酸盐的比例，作为更快的氢化物种，从而提高了 Ni/CeEu(9:1) 催化剂的低温 CO _{2甲烷化活性。}这项工作提供了一种化学策略来增加活性位点的数量并深入了解增强催化性能的起源。