Electroforming of a metal-organic framework on porous copper hollow fibers

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Abstract

Porous copper hollow fibers have been used, for the first time, as both a support structure and a metal source for preparing thin metal-organic framework (Cu-BTC) films via a fast, facile and direct electrochemical route. The focus is on the effects of the presence of a supporting electrolyte and the magnitude of the applied electrical potential on the formation and the morphology of the films. In the absence of a supporting electrolyte, and at low potential, more uniform films with smaller particles are obtained. This is attributed to the more pronounced electric-field driven mass transport of the organic ligand from the liquid bulk towards the surface of the electrode combined with the slower dissolution of copper due to the lower overpotentials. In the presence of a supporting electrolyte the ligand transport is much slower and copper dissolution is higher due to higher overpotentials; this results in the formation of less homogeneous films and the growth of metal-organic framework crystals in the liquid bulk. The localized formation of thin metal-organic framework films on metal porous hollow fibers with high surface area to volume ratio is an important step towards various applications, including membranes, microfluidic devices, sensors and heterogeneous catalysts.

Original languageEnglish
Pages (from-to)12616-12626
Number of pages11
JournalJournal of Materials Chemistry A
Volume7
Issue number20
DOIs
Publication statusPublished - 28 May 2019

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Electroforming
Copper
Metals
Fibers
Electrolytes
Dissolution
Ligands
Liquids
Microfluidics
Mass transfer
Electric fields
Membranes
Crystals
Electrodes
Catalysts
Sensors

Cite this

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title = "Electroforming of a metal-organic framework on porous copper hollow fibers",
abstract = "Porous copper hollow fibers have been used, for the first time, as both a support structure and a metal source for preparing thin metal-organic framework (Cu-BTC) films via a fast, facile and direct electrochemical route. The focus is on the effects of the presence of a supporting electrolyte and the magnitude of the applied electrical potential on the formation and the morphology of the films. In the absence of a supporting electrolyte, and at low potential, more uniform films with smaller particles are obtained. This is attributed to the more pronounced electric-field driven mass transport of the organic ligand from the liquid bulk towards the surface of the electrode combined with the slower dissolution of copper due to the lower overpotentials. In the presence of a supporting electrolyte the ligand transport is much slower and copper dissolution is higher due to higher overpotentials; this results in the formation of less homogeneous films and the growth of metal-organic framework crystals in the liquid bulk. The localized formation of thin metal-organic framework films on metal porous hollow fibers with high surface area to volume ratio is an important step towards various applications, including membranes, microfluidic devices, sensors and heterogeneous catalysts.",
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Electroforming of a metal-organic framework on porous copper hollow fibers. / Demirel, Özlem H.; Rijnaarts, Timon; De Wit, Patrick; Wood, Jeffery A.; Benes, Nieck E.

In: Journal of Materials Chemistry A, Vol. 7, No. 20, 28.05.2019, p. 12616-12626.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Rijnaarts, Timon

AU - De Wit, Patrick

AU - Wood, Jeffery A.

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AB - Porous copper hollow fibers have been used, for the first time, as both a support structure and a metal source for preparing thin metal-organic framework (Cu-BTC) films via a fast, facile and direct electrochemical route. The focus is on the effects of the presence of a supporting electrolyte and the magnitude of the applied electrical potential on the formation and the morphology of the films. In the absence of a supporting electrolyte, and at low potential, more uniform films with smaller particles are obtained. This is attributed to the more pronounced electric-field driven mass transport of the organic ligand from the liquid bulk towards the surface of the electrode combined with the slower dissolution of copper due to the lower overpotentials. In the presence of a supporting electrolyte the ligand transport is much slower and copper dissolution is higher due to higher overpotentials; this results in the formation of less homogeneous films and the growth of metal-organic framework crystals in the liquid bulk. The localized formation of thin metal-organic framework films on metal porous hollow fibers with high surface area to volume ratio is an important step towards various applications, including membranes, microfluidic devices, sensors and heterogeneous catalysts.

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