Highly structured metal-organic framework nanofibers for methane storage

Yibo Dou, Carlos Grande, Andreas Kaiser*, Wenjing Zhang*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Porous materials such as metal-organic frameworks (MOFs) with high theoretical volumetric gas uptake capacity are promising materials for gas storage and separation, but the structuring for practical applications is challenging. Herein, we report a general and feasible strategy to combine electrospinning with a phase conversion method to decorate polyacrylonitrile nanofibers (PAN NFs) with Cu-MOF (HKUST-1). The strategy is based on the combination of surface pretreatment of the NFs with Cu(OH)2 and a subsequent phase conversion into HKUST-1 crystals (PC-HKUST-1). A significant higher loading of HKUST-1 in the PAN NF matrix was achieved by the phase conversion method compared with direct electrospinning of MOF slurries or in-situ growth of MOF crystals on NFs. As a result, the hierarchical structured PC (phase conversion)-HKUST-1 NFs revealed the highest gravimetric storage capacity of 86 cm3 g−1 (STP) at 3500 kPa and 298 K for methane (CH4), which is higher than other HKUST 1 NFs reported previously. The improved CH4 uptake can be explained by the high loading of HKUST-1 due to the high availability of Cu-ions localized on the surface of the NFs during the phase conversion process, resulting in high surface area and excellent gas access of the phase converted HKUST-1. Thus, the developed strategy of structuring MOFs could be of interest for the fabrication of tailor-made MOF NF architectures for other energy and environmental applications.

Original languageEnglish
JournalScience China Materials
ISSN2095-8226
DOIs
Publication statusAccepted/In press - 2021

Bibliographical note

Funding Information:
This work was supported by the Grande Solution Project“HiGradeGas” (48279), and Innovation Fund Denmark, exploring NFs-based adsorbents for biogas upgrading and storage. We also thank the Danish Research Council to provide funding to support fundamental research on electrospinning (8022-00237B) and for investigating NFs structures for enzyme immobilization (6111-00232B).

Publisher Copyright:
© 2021, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Keywords

  • electrospinning
  • metal-organic frameworks (MOFs)
  • methane storage
  • phase conversion

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