Lattice Matching Growth of Conductive Hierarchical Porous MOF/LDH Heteronanotube Arrays for Highly Efficient Water Oxidation

The conjugation of metal–organic frameworks (MOFs) into different multicomponent materials to precisely construct aligned heterostructures is fascinating but elusive owing to the disparate interfacial energy and nucleation kinetics. Herein, a promising lattice‐matching growth strategy is demonstrate...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2021-02, Vol.33 (8), p.e2006351-n/a
Main Authors: Wang, Ying, Yan, Liting, Dastafkan, Kamran, Zhao, Chuan, Zhao, Xuebo, Xue, Yingying, Huo, Jiamin, Li, Shuni, Zhai, Quanguo
Format: Article
Language:English
Subjects:
Arrays
cMOF/LDH heteronanotube arrays
Conjugation
Crystal lattices
Current density
Electrolysis
Heterostructures
hierarchical porous structures
Hydroxides
Interfacial energy
Lattice matching
lattice matching growth
Materials science
Metal-organic frameworks
Nanowires
Nucleation
Oxidation
oxygen evolution reaction, water oxidation
Oxygen evolution reactions
Structural hierarchy
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Summary:The conjugation of metal–organic frameworks (MOFs) into different multicomponent materials to precisely construct aligned heterostructures is fascinating but elusive owing to the disparate interfacial energy and nucleation kinetics. Herein, a promising lattice‐matching growth strategy is demonstrated for conductive MOF/layered double hydroxide (cMOF/LDH) heteronanotube arrays with highly ordered hierarchical porous structures enabling an ultraefficient oxygen evolution reaction (OER). CoNiFe‐LDH nanowires are used as interior template to engineer an interface by inlaying cMOF and matching two crystal lattice systems, thus conducting a graft growth of cMOF/LDH heterostructures along the LDH nanowire. A class of hierarchical porous cMOF/LDH heteronanotube arrays is produced through continuously regulating the transformation degree. The synergistic effects of the cMOF and LDH components significantly promote the chemical and electronic structures of the heteronanotube arrays and their electroactive surface area. Optimized heteronanotube arrays exhibit extraordinary OER activity with ultralow overpotentials of 216 and 227 mV to deliver current densities of 50 and 100 mA cm−2 with a small Tafel slope of 34.1 mV dec−1, ranking it among the best MOF and non‐noble‐metal‐based catalysts for OER. The robust performance under high current density and vigorous gas bubble conditions enable such hierarchical MOF/LDH heteronanotube arrays as promising materials for practical water electrolysis. Porous metal–organic framework/layered double hydroxide (MOF/LDH) hierarchical heteronanotube arrays consisting of a lattice‐matched 2D conductive MOF and a trimetallic LDH, established by an inner template sacrificial process, enable excellent activity and superior stability toward the oxygen evolution reaction (OER) reaction in comparison to the best MOF and non‐noble‐metal‐based catalysts for the OER.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.202006351