Amorphous Metal-Organic Framework-Dominated Nanocomposites with Both Compositional and Structural Heterogeneity for Oxygen Evolution
Amorphous Metal-Organic Framework-Dominated Nanocomposites with Both Compositional and Structural Heterogeneity for Oxygen Evolution
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具有成分和结构异质性的非晶金属有机框架主导的析氧纳米复合材料
DOI：
10.1002/anie.201914587
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发表时间：
2020-01-09
影响因子：
16.6
通讯作者：
Yu, Chengzhong
中科院分区：
文献类型：
--
作者：
Liu, Chao;Wang, Jing;Yu, Chengzhong
无定形金属有机骨架材料（aMOFs）是一类具有巨大应用潜力的新型材料，但aMOFs的制备条件苛刻，具有复杂组成和结构的aMOFs很少报道。在这项工作中，aMOF主导的纳米复合材料（aMOF-NC）的结构和组成的复杂性已经使用一个简单的方法合成。基于实验和密度泛函理论计算结果，提出了一种配体竞争非晶化机制。aMOF-NC具有核-壳纳米棒@纳米片结构，在核-壳结构的纳米棒中包括富Fe的Fe-Co-aMOF核和富Co的Fe-Co-aMOF壳，以及作为外层的无定形Co（OH）（2）纳米片。得益于结构和组成的异质性，aMOF-NC表现出优异的析氧反应活性，在10.0 mA cm（-2）下具有249 mV的低过电位和39.5 mV dec（-1）的塔菲尔斜率。
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).