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High Proton Mobility with High Directionality in Isolated Channels of MOF-74

Title
High Proton Mobility with High Directionality in Isolated Channels of MOF-74
Authors
Hwang, Sun HyunLee, Eun JiSong, Da HaeJeong, Nak Cheon
DGIST Authors
Jeong, Nak Cheon
Issue Date
2018-10
Citation
ACS Applied Materials and Interfaces, 10(41), 35354-35360
Type
Article
Article Type
Article
Author Keyword
directional proton migration; high proton mobility; low activation energy; metal-organic framework; MOF-74
Keyword
METAL-ORGANIC FRAMEWORK; SINGLE-CRYSTAL; CONDUCTION PROPERTIES; TEMPERATURE; ACTIVATION; TRANSITION; TRANSPORT; BEHAVIOR; RANGE; SITES
ISSN
1944-8244
Abstract
Isolated one-dimensional (1-D) proton channels in a metal-organic framework, MOF-74, have been reasonably expected to show highly directional proton conductivity, although no evidence has been provided. As a result of dimensional anisotropy of the channels evenly aligned in the c-axis of MOF-74 single crystal, highly directional proton conductivity is demonstrated by using electrochemical impedance spectroscopy. In particular, single crystals treated with sulfuric acid or ammonium hydroxide displays a maximum ∼1200-fold-enhanced c-axis proton conductivity compared to its a-axis conductivity, demonstrating highly directional proton migration through the channels. Very low activation energies (e.g., 0.12 eV) for the c-axis conductivity of MOF-74 also suggest a high proton mobility that arises via Grotthuss proton transfer parallel to the channels. Copyright © 2018 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/9366
DOI
10.1021/acsami.8b11816
Publisher
American Chemical Society
Related Researcher
  • Author Jeong, Nak Cheon Nanoporous Chemistry Laboratory
  • Research Interests Inorganic Chemistry; Metal-Organic Framework; Nanoporous Materials; Electron Transport;Ion Transport
Files:
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Collection:
Department of Emerging Materials ScienceNanoporous Chemistry Laboratory1. Journal Articles


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