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Amorphous Metal–Organic Framework‐Dominated Nanocomposites with Both Compositional and Structural Heterogeneity for Oxygen Evolution
Author(s) -
Liu Chao,
Wang Jing,
Wan Jingjing,
Cheng Yan,
Huang Rong,
Zhang Chaoqi,
Hu Wenli,
Wei Guangfeng,
Yu Chengzhong
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201914587
Subject(s) - amorphous solid , materials science , metal organic framework , nanosheet , nanocomposite , nanorod , overpotential , oxygen evolution , chemical engineering , tafel equation , nanotechnology , chemistry , crystallography , electrode , electrochemistry , adsorption , engineering
Amorphous metal–organic frameworks ( a MOFs) are an emerging family of attractive materials with great application potential, however a MOFs are usually prepared under harsh conditions and a MOFs with complex compositions and structures are rarely reported. In this work, an a MOF‐dominated nanocomposite ( a MOF‐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 a MOF‐NC possesses a core–shell nanorod@nanosheet architecture, including a Fe‐rich Fe‐Co‐ a MOF core and a Co‐rich Fe‐Co‐ a MOF 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 a MOF‐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 .