Wang Ying, Yan Liting, Dastafkan Kamran, Zhao Chuan, Zhao Xuebo, Xue Yingying, Huo Jiamin, Li Shuni, Zhai Quanguo
Key Laboratory of Macromolecular Science of Shaanxi Province, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, Shaanxi, 710062, China.
School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), No. 3501, Daxue Road, Changqing District, Jinan, Shandong, 250353, China.
Adv Mater. 2021 Feb;33(8):e2006351. doi: 10.1002/adma.202006351. Epub 2021 Jan 18.
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 with a small Tafel slope of 34.1 mV dec , 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.
将金属有机框架（MOF）与不同的多组分材料共轭以精确构建排列有序的异质结构很有吸引力，但由于界面能和形核动力学的差异，这一过程难以实现。在此，我们展示了一种有前景的晶格匹配生长策略，用于制备具有高度有序分级多孔结构的导电MOF/层状双氢氧化物（cMOF/LDH）异质纳米管阵列，该结构能够实现超高效析氧反应（OER）。CoNiFe-LDH纳米线用作内部模板，通过镶嵌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。通过连续调节转变程度，制备出一类分级多孔的cMOF/LDH异质纳米管阵列。cMOF和LDH组分的协同效应显著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。优化后的异质纳米管阵列表现出非凡的OER活性，在过电位低至216和227 mV时，可提供50和100 mA cm的电流密度，塔菲尔斜率小至34.1 mV dec，使其跻身于最佳的MOF基和非贵金属基OER催化剂之列。在高电流密度和剧烈气泡条件下稳健的性能，使这种分级MOF/LDH异质纳米管阵列成为实际水电解的有前景材料。
