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

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Lattice Matching Growth of Conductive Hierarchical Porous MOF/LDH Heteronanotube Arrays for Highly Efficient Water Oxidation
Advanced Materials ( IF 27.4 ) Pub Date : 2021-01-18 , DOI: 10.1002/adma.202006351
Ying Wang ₁ , Liting Yan ₂ , Kamran Dastafkan ₃ , Chuan Zhao ₃ , Xuebo Zhao ₂ , Yingying Xue ₁ , Jiamin Huo ₁ , Shuni Li ₁ , Quanguo Zhai ₁

Affiliation

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.

中文翻译：

用于高效水氧化的导电分层多孔 MOF/LDH 异质纳米管阵列的晶格匹配生长

由于不同的界面能和成核动力学，将金属-有机框架 (MOF) 共轭到不同的多组分材料中以精确构建对齐的异质结构是令人着迷的，但难以捉摸。本文展示了一种有前途的晶格匹配生长策略，用于具有高度有序的分层多孔结构的导电 MOF/层状双氢氧化物 (cMOF/LDH) 异质纳米管阵列，可实现超高效的析氧反应 (OER)。CoNiFe-LDH纳米线用作内部模板，通过嵌入cMOF并匹配两个晶格系统来设计界面，从而沿着LDH纳米线进行cMOF/LDH异质结构的接枝生长。通过不断调节相变程度，制备出一类分级多孔cMOF/LDH异质纳米管阵列。cMOF 和 LDH 组分的协同作用显着促进了异质纳米管阵列的化学和电子结构及其电活性表面积。优化的异质纳米管阵列表现出非凡的 OER 活性，具有 216 和 227 mV 的超低过电位，可提供 50 和 100 mA cm 的电流密度^-2具有 34.1 mV dec ^-1的小 Tafel 斜率，是用于 OER 的最佳 MOF 和非贵金属基催化剂之一。在高电流密度和剧烈气泡条件下的稳健性能使这种分层 MOF/LDH 异质纳米管阵列成为用于实际水电解的有前途的材料。

更新日期：2021-02-22

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