In Situ Transformation of MOFs into Layered Double Hydroxide Embedded Metal Sulfides for Improved Electrocatalytic and Supercapacitive Performance,Advanced Materials

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In Situ Transformation of MOFs into Layered Double Hydroxide Embedded Metal Sulfides for Improved Electrocatalytic and Supercapacitive Performance
Advanced Materials ( IF 27.4 ) Pub Date : 2017-05-03 , DOI: 10.1002/adma.201606814
Gamze Yilmaz _{1,

2} , Kah Meng Yam ₃ , Chun Zhang ₃ , Hong Jin Fan ₄ , Ghim Wei Ho _{1,

5}

Affiliation

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/Co₉S₈) system. The embedment of metal sulfide species (Co₉S₈) at the LDH intergalleries offers optimal interfacing of the hybrid constituent elements and materials stability. The hybrid NiCo‐LDH/Co₉S₈ 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.

中文翻译：

MOF原位转化为层状双氢氧化物嵌入的金属硫化物，以改善电催化性能和超电容性能

由于低电导率和较差的化学稳定性，直接采用金属有机框架（MOF）作为电极材料显示出电化学性能差。在这项研究中，我们证明了MOF自我模板化的拟态转化为表面化学丰富的空心框架，可提供高反应性，持久性和通用的电化学活性能量转换和存储功能。MOF衍生的空心菱形十二面体模板的原位拟晶形转变和镍钴层状双氢氧化物（NiCo-LDHs）的硫化导致构造了层间金属硫化物（NiCo-LDH / Co ₉ S ₈）系统。金属硫化物（Co ₉ S ₈的包埋）在LDH跨画廊中，可以为杂化组成元素和材料稳定性提供最佳的接口。NiCo-LDH / Co ₉ S _8混合系统共同提供了理想的多孔结构，丰富的氧化还原化学物质和高电导率基体。这导致其互补的电催化氢释放和超电容储能性能的显着提高。这项工作建立了MOF衍生支架在设计用于电化学应用及其他领域的新型杂化无机-有机功能材料方面的潜力。

更新日期：2017-05-03

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