Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore.
Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117583, Singapore.
Adv Mater. 2017 Jul;29(26). doi: 10.1002/adma.201606814. Epub 2017 May 3.
Direct adoption of metal-organic frameworks (MOFs) as electrode materials shows impoverished electrochemical performance owing to low electrical conductivity and poor chemical stability. In this study, we demonstrate self-templated pseudomorphic transformation of MOF into surface chemistry rich hollow framework that delivers highly reactive, durable, and universal electrochemically active energy conversion and storage functionalities. In situ pseudomorphic transformation of MOF-derived hollow rhombic dodecahedron template and sulfurization of nickel cobalt layered double hydroxides (NiCo-LDHs) lead to the construction of interlayered metal sulfides (NiCo-LDH/Co S ) system. The embedment of metal sulfide species (Co S ) at the LDH intergalleries offers optimal interfacing of the hybrid constituent elements and materials stability. The hybrid NiCo-LDH/Co S system collectively presents an ideal porous structure, rich redox chemistry, and high electrical conductivity matrix. This leads to a significant enhancement in its complementary electrocatalytic hydrogen evolution and supercapacitive energy storage properties. This work establishes the potential of MOF derived scaffold for designing of novel class hybrid inorganic-organic functional materials for electrochemical applications and beyond.
直接将金属-有机骨架（MOFs）用作电极材料会导致其电化学性能不佳，因为其导电性低且化学稳定性差。在本研究中，我们展示了 MOF 通过自模板伪转化为表面富含化学物质的中空框架，从而提供了高反应性、耐用性和通用的电化学活性能量转换和存储功能。MOF 衍生的中空菱形十二面体模板的原位伪转化和镍钴层状双氢氧化物（NiCo-LDH）的硫化导致层间金属硫化物（NiCo-LDH/Co S ）系统的构建。金属硫化物物种（Co S ）的嵌入在 LDH 夹层中提供了混合组成元素的最佳界面和材料稳定性。混合的 NiCo-LDH/Co S 系统共同呈现出理想的多孔结构、丰富的氧化还原化学和高导电性基质。这导致其互补的电催化析氢和超级电容器储能性能得到显著提高。这项工作为设计用于电化学应用和其他领域的新型混合无机-有机功能材料奠定了 MOF 衍生支架的潜力。
