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Morphology evolution of bimetallic Ni/Zn-MOFs and derived Ni3ZnC0.7/Ni/ZnO used to destabilize MgH2 by Xiubo Xie; Bing Zhang; Hideo Kimura; Cui Ni; Ronghai Yu; Wei Du is a Engineering article available to read on EtoBox.

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Herein, 3D porous flower-like Ni/Zn-MOFs are synthesized via a simple solvothermal method. The reaction time shows obvious effects on the morphology evolution of Ni/Zn-MOFs, and the morphology evolution from plate to 3D flower is governed by a “nucleation–dissolution–renucleation” mechanism. Nonstoichiometric bimetallic carbide-containing composites (Ni3ZnC0.7/Ni/ZnO composites) are obtained through the simple calcination of Ni/Zn-MOFs under 4 MPa H2, suggesting that ZnO cannot be reduced and Ni3ZnC0.7 is stable even under 24 h of hydrogen treatment. The MgH2-5 wt% Ni3ZnC0.7/Ni/ZnO-3 composite began to dehydrogenate at 230 °C and 5 wt% H2 can still be released within the initial 1 h at 573 K. The hydrogen absorption capacity of the composite reached 2.57 wt% H2 at 423 K within 600 s. Interestingly, the composite can still absorb 0.78 wt% H2 at 353 K within 60 min. Compared to pure MgH2, the activation energy (Ea) of hydrogen absorption and dehydrogenation of the composite decreased to 44.85 and 93.06 KJ/mol, respectively. Comparing the cases of Ni3ZnC0.7, Ni, and ZnO addition clearly reveals that Ni3ZnC0.7 and Ni are the primary catalysts in these improvements. The Ni3ZnC0.7/Ni/ZnO

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Author

Xiubo Xie; Bing Zhang; Hideo Kimura; Cui Ni; Ronghai Yu; Wei Du

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)