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A Metal–Organic Framework Thin Film for Selective Mg 2+ Transport
Author(s) -
Luo Jingru,
Li Yang,
Zhang Haochuan,
Wang Ailun,
Lo WeiShang,
Dong Qi,
Wong Nicholas,
Povinelli Christopher,
Shao Yucai,
Chereddy Sumanth,
Wunder Stephanie,
Mohanty Udayan,
Tsung ChiaKuang,
Wang Dunwei
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201908706
Subject(s) - anode , thin film , cathode , membrane , materials science , anodizing , oxide , conductivity , chemical engineering , overpotential , ionic conductivity , metal , inorganic chemistry , analytical chemistry (journal) , chemistry , aluminium , electrolyte , electrode , nanotechnology , composite material , chromatography , electrochemistry , metallurgy , biochemistry , engineering
The incompatibility between the anode and the cathode chemistry limits the used of Mg as an anode. This issue may be addressed by separating the anolyte and the catholyte with a membrane that only allows for Mg 2+ transport. Mg‐MOF‐74 thin films were used as the separator for this purpose. It was shown to meet the needs of low‐resistance, selective Mg 2+ transport. The uniform MOF thin films supported on Au substrate with thicknesses down to ca. 202 nm showed an intrinsic resistance as low as 6.4 Ω cm 2 , with the normalized room‐temperature ionic conductivity of ca. 3.17×10 −6 S cm −1 . When synthesized directly onto a porous anodized aluminum oxide (AAO) support, the resulting films were used as a standalone membrane to permit stable, low‐overpotential Mg striping and plating for over 100 cycles at a current density of 0.05 mA cm −2 . The film was effective in blocking solvent molecules and counterions from crossing over for extended period of time.