PH-dependent proton conducting behavior in a metal-organic framework material

Won Ju Phang; Woo Ram Lee; Kicheon Yoo; Dae Won Ryu; Bongsoo Kim; Chang Seop Hong

doi:10.1002/anie.201404164

PH-dependent proton conducting behavior in a metal-organic framework material

Won Ju Phang, Woo Ram Lee, Kicheon Yoo, Dae Won Ryu, Bongsoo Kim, Chang Seop Hong

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

107 Citations (Scopus)

Abstract

A porous metal-organic framework (MOF), [Ni₂(dobdc)(H ₂O)₂] 6H₂O (Ni₂(dobdc) or Ni-MOF-74; dobdc^4-=2,5-dioxido-1,4-benzenedicarboxylate) with hexagonal channels was synthesized using a microwave-assisted solvothermal reaction. Soaking Ni₂(dobdc) in sulfuric acid solutions at different pH values afforded new proton-conducting frameworks, H⁺@Ni₂(dobdc). At pH1.8, the acidified MOF shows proton conductivity of 2.2×10 ^-2Scm^-1 at 80°C and 95% relative humidity (RH), approaching the highest values reported for MOFs. Proton conduction occurs via the Grotthuss mechanism with a significantly low activation energy as compared to other proton-conducting MOFs. Protonated water clusters within the pores of H⁺@Ni₂(dobdc) play an important role in the conduction process.

Original language	English
Pages (from-to)	8383-8387
Number of pages	5
Journal	Angewandte Chemie - International Edition
Volume	53
Issue number	32
DOIs	https://doi.org/10.1002/anie.201404164
Publication status	Published - 2014 Aug 4

ASJC Scopus subject areas

Chemistry(all)
Catalysis

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title = "PH-dependent proton conducting behavior in a metal-organic framework material",

abstract = "A porous metal-organic framework (MOF), [Ni2(dobdc)(H 2O)2] 6H2O (Ni2(dobdc) or Ni-MOF-74; dobdc4-=2,5-dioxido-1,4-benzenedicarboxylate) with hexagonal channels was synthesized using a microwave-assisted solvothermal reaction. Soaking Ni2(dobdc) in sulfuric acid solutions at different pH values afforded new proton-conducting frameworks, H+@Ni2(dobdc). At pH1.8, the acidified MOF shows proton conductivity of 2.2×10 -2Scm-1 at 80°C and 95% relative humidity (RH), approaching the highest values reported for MOFs. Proton conduction occurs via the Grotthuss mechanism with a significantly low activation energy as compared to other proton-conducting MOFs. Protonated water clusters within the pores of H+@Ni2(dobdc) play an important role in the conduction process.",

keywords = "metal-organic frameworks, proton conducting materials, protonated water clusters",

author = "Phang, {Won Ju} and Lee, {Woo Ram} and Kicheon Yoo and Ryu, {Dae Won} and Bongsoo Kim and Hong, {Chang Seop}",

year = "2014",

month = aug,

day = "4",

doi = "10.1002/anie.201404164",

language = "English",

volume = "53",

pages = "8383--8387",

journal = "Angewandte Chemie - International Edition",

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publisher = "John Wiley and Sons Ltd",

number = "32",

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T1 - PH-dependent proton conducting behavior in a metal-organic framework material

AU - Phang, Won Ju

AU - Lee, Woo Ram

AU - Yoo, Kicheon

AU - Ryu, Dae Won

AU - Kim, Bongsoo

AU - Hong, Chang Seop

PY - 2014/8/4

Y1 - 2014/8/4

N2 - A porous metal-organic framework (MOF), [Ni2(dobdc)(H 2O)2] 6H2O (Ni2(dobdc) or Ni-MOF-74; dobdc4-=2,5-dioxido-1,4-benzenedicarboxylate) with hexagonal channels was synthesized using a microwave-assisted solvothermal reaction. Soaking Ni2(dobdc) in sulfuric acid solutions at different pH values afforded new proton-conducting frameworks, H+@Ni2(dobdc). At pH1.8, the acidified MOF shows proton conductivity of 2.2×10 -2Scm-1 at 80°C and 95% relative humidity (RH), approaching the highest values reported for MOFs. Proton conduction occurs via the Grotthuss mechanism with a significantly low activation energy as compared to other proton-conducting MOFs. Protonated water clusters within the pores of H+@Ni2(dobdc) play an important role in the conduction process.

AB - A porous metal-organic framework (MOF), [Ni2(dobdc)(H 2O)2] 6H2O (Ni2(dobdc) or Ni-MOF-74; dobdc4-=2,5-dioxido-1,4-benzenedicarboxylate) with hexagonal channels was synthesized using a microwave-assisted solvothermal reaction. Soaking Ni2(dobdc) in sulfuric acid solutions at different pH values afforded new proton-conducting frameworks, H+@Ni2(dobdc). At pH1.8, the acidified MOF shows proton conductivity of 2.2×10 -2Scm-1 at 80°C and 95% relative humidity (RH), approaching the highest values reported for MOFs. Proton conduction occurs via the Grotthuss mechanism with a significantly low activation energy as compared to other proton-conducting MOFs. Protonated water clusters within the pores of H+@Ni2(dobdc) play an important role in the conduction process.

KW - metal-organic frameworks

KW - proton conducting materials

KW - protonated water clusters

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