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  • Structural transformation of highly active metal–organic framework electrocatalysts during the oxygen evolution reaction

    Author(s)
    Zhao, S
    Tan, C
    He, CT
    An, P
    Xie, F
    Jiang, S
    Zhu, Y
    Wu, KH
    Zhang, B
    Li, H
    Zhang, J
    Chen, Y
    Liu, S
    Dong, J
    Tang, Z
    Griffith University Author(s)
    Tang, Zhiyong
    Year published
    2020
    Metadata
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    Abstract
    Metal–organic frameworks (MOFs) are increasingly being investigated as electrocatalysts for the oxygen evolution reaction (OER). Despite their promising catalytic activity, many fundamental questions concerning their structure−performance relationships—especially those regarding the roles of active species—remain to be answered. Here we show the structural transformation of a Ni0.5Co0.5-MOF-74 during the OER by operando X-ray absorption spectroscopy analysis and high-resolution transmission electron microscopy imaging. We suggest that Ni0.5Co0.5OOH0.75, with abundant oxygen vacancies and high oxidation states, forms in situ ...
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    Metal–organic frameworks (MOFs) are increasingly being investigated as electrocatalysts for the oxygen evolution reaction (OER). Despite their promising catalytic activity, many fundamental questions concerning their structure−performance relationships—especially those regarding the roles of active species—remain to be answered. Here we show the structural transformation of a Ni0.5Co0.5-MOF-74 during the OER by operando X-ray absorption spectroscopy analysis and high-resolution transmission electron microscopy imaging. We suggest that Ni0.5Co0.5OOH0.75, with abundant oxygen vacancies and high oxidation states, forms in situ and is responsible for the high OER activity observed. The ratio of Ni to Co in the bimetallic centres alters the geometric and electronic structure of as-formed active species and in turn the catalytic activity. Based on our understanding of this system, we fabricate a Ni0.9Fe0.1-MOF that delivers low overpotentials of 198 mV and 231 mV at 10 mA cm−2 and 20 mA cm−2, respectively.
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    Journal Title
    Nature Energy
    DOI
    https://doi.org/10.1038/s41560-020-00709-1
    Note
    This publication has been entered in Griffith Research Online as an advanced online version.
    Subject
    Environmental engineering
    Publication URI
    http://hdl.handle.net/10072/398996
    Collection
    • Journal articles

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