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

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 holl...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2017-07, Vol.29 (26), p.n/a
Main Authors: Yilmaz, Gamze, Yam, Kah Meng, Zhang, Chun, Fan, Hong Jin, Ho, Ghim Wei
Format: Article
Language:English
Subjects:
Corrosion resistance
Electrical resistivity
electrocatalysts
Electrochemical analysis
Electrode materials
Embedded systems
Energy conversion
Energy storage
Hybrid systems
Hydrogen evolution
hydrogen evolution reaction
Hydrogen storage
Hydrogen-based energy
Hydroxides
Interface stability
layered double hydroxides
Materials science
Metal sulfides
Metal-organic frameworks
Nickel
Structural stability
Sulfurization
supercapacitors
Surface chemistry
Transformations
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Summary: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. An in situ pseudomorphic transformation strategy is established via facile zeoliticimidazole‐framework‐derived templated growth and sulfurization of nickel cobalt layered double hydroxides (NiCo‐LDH) to form a hybrid hydroxide–sulfide system. The hybrid system synchronously realizes an ideal porous framework, rich redox chemistry, and a high‐electrical‐conductivity matrix. This leads to a significant enhancement in its complementary electrocatalytic H2 generation and supercapacitive energystorage properties.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201606814