Amorphous metal-organic frameworks (aMOFs) are an emerging family of attractive materials with great application potential, however aMOFs are usually prepared under harsh conditions and aMOFs with complex compositions and structures are rarely reported. In this work, an aMOF-dominated nanocomposite (aMOF-NC) with both structural and compositional complexity has been synthesized using a facile approach. A ligand-competition amorphization mechanism is proposed based on experimental and density functional theory calculation results. The aMOF-NC possesses a core-shell nanorod@nanosheet architecture, including a Fe-rich Fe-Co-aMOF core and a Co-rich Fe-Co-aMOF shell in the core-shell structured nanorod, and amorphous Co(OH)2 nanosheets as the outer layer. Benefiting from the structural and compositional heterogeneity, the aMOF-NC demonstrates an excellent oxygen evolution reaction activity with a low overpotential of 249 mV at 10.0 mA cm-2 and Tafel slope of 39.5 mV dec-1 .

中文翻译：

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非晶态的有机金属骨架为主的纳米复合材料，具有氧分解的组成和结构异质性。

非晶金属有机骨架（aMOFs）是一种具有巨大应用潜力的新兴诱人材料，然而，aMOF通常是在苛刻的条件下制备的，很少报道具有复杂组成和结构的aMOF。在这项工作中，使用简便的方法合成了具有结构和成分复杂性的aMOF为主的纳米复合材料（aMOF-NC）。基于实验和密度泛函理论计算结果，提出了配体竞争非晶化机理。aMOF-NC具有核-壳nanorod @ nanosheet结构，包括富铁的Fe-Co-aMOF核和核壳结构的纳米棒中的富钴的Fe-Co-aMOF壳，以及无定形的Co（OH） 2纳米片作为外层。受益于结构和成分的异质性，