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|a Yuan, Shuai
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|a Massachusetts Institute of Technology. Department of Mechanical Engineering
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|a Massachusetts Institute of Technology. Department of Materials Science and Engineering
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|a Massachusetts Institute of Technology. Research Laboratory of Electronics
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|a Massachusetts Institute of Technology. Department of Chemical Engineering
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|a Peng, Jiayu
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|a Zhang, Yirui
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|a Shao-Horn, Yang
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|a Stability Trend of Metal-Organic Frameworks with Heterometal-Modified Hexanuclear Zr Building Units
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|b American Chemical Society (ACS),
|c 2020-10-23T20:23:52Z.
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|z Get fulltext
|u https://hdl.handle.net/1721.1/128195
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|a Bimetallic metal-organic frameworks (MOFs) based on heterometal-modified hexanuclear Zr building units have emerged as promising materials for applications in energy-related fields such as heterogenous catalysis/electrocatalysis. However, their stability remains a challenge under some practical conditions, and the physical/chemical origin to the (in)stability is not well-understood. Herein, we selected three representative Zr-MOFs (MOF-808, NU-1000, and UiO-66) as platforms and incorporated different heterometals (Ti4+, V3+, V5+, Cr3+, Cr6+, Mn2+, Fe2+, Fe3+, Co2+, Ni2+, Cu2+, and Zn2+) to form a series of bimetallic M/Zr-MOFs. Their stability was examined in aqueous solutions of various pH to define their stability windows and understand their stability trend. The stability of M/Zr-MOFs was found to be dictated by the oxidation states of incorporated heterometals and slightly affected by the supporting Zr-MOFs. Water-exchange rate constant, defined as the rate constant by replacing a coordinated water with a solution water, was proposed as the stability descriptor to explain the stability trend and guide the design and application of future stable MOFs.
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|a Article
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|t Journal of Physical Chemistry C
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