Oxygen vacancies and metal–support synergistic effects in heterogeneous catalysis play a decisive role in catalytic efficiency. In this work, NiO supported on ceria nanorods (Ni/CeO₂-NR) and ceria nanocubes (Ni/CeO₂-NC) catalysts exhibit strong morphology-dependent oxygen vacancies content and NiO–CeO₂ synergistic actions for N₂O decomposition. Ni/CeO₂-NR catalysts possess higher amounts of oxygen vacancies than Ni/CeO₂-NC, while Ni/CeO₂-NC samples display stronger metal–support synergistic actions to anchor more surface NiO clusters and boundary Ni–O–Ce nanostructures. Catalytic activity tests show that Ni/CeO₂-NC catalysts exhibit a superior efficiency to Ni/CeO₂-NR catalysts. The outstanding catalytic activities of Ni/CeO₂-NC catalysts are related to a larger number of surface NiO clusters and boundary Ni–O–Ce nanostructures, which are much more active than oxygen vacancies for N₂O decomposition. Furthermore, the boundary Ni–O–Ce is found to be a more reactive site than surface NiO clusters. This study presents a new strategy to design high-efficiency supported metal catalysts through controlling oxygen vacancies and metal–support synergistic effects by morphology-dependent synthesis.

中文翻译：

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Ni / CeO ₂催化剂对N ₂ O分解的形态学依赖的氧空位和协同效应†

氧空位和金属-载体在非均相催化中的协同作用对催化效率起决定性作用。在这项工作中，负载在二氧化铈纳米棒（Ni / CeO ₂ -NR）和二氧化铈纳米立方体（Ni / CeO ₂ -NC）催化剂上的NiO表现出很强的形态学依赖的氧空位含量和NiO–CeO ₂对N ₂ O分解的协同作用。Ni / CeO ₂ -NR催化剂比Ni / CeO ₂ -NC具有更高的氧空位，而Ni / CeO ₂ -NC样品显示出较强的金属-载体协同作用，以锚定更多的表面NiO簇和边界Ni–O–Ce纳米结构。催化活性测试表明Ni / CeO ₂-NC催化剂比Ni / CeO ₂ -NR催化剂具有更高的效率。Ni / CeO ₂ -NC催化剂出色的催化活性与大量的表面NiO团簇和边界Ni-O-Ce纳米结构有关，它们比氧空位对N ₂ O的分解更具活性。此外，发现边界Ni–O–Ce比表面NiO团簇更具活性。这项研究提出了一种新的策略，可以通过控制氧空位和通过形态依赖的合成来控制金属-载体的协同效应，从而设计出高效的载体金属催化剂。