A Metal–Organic Framework Thin Film for Selective Mg2+ Transport. (13th September 2019)

• Record Type: Journal Article
• Authors: Luo, Jingru; Li, Yang; Zhang, Haochuan; Wang, Ailun; Lo, Wei‐Shang; Dong, Qi; Wong, Nicholas; Povinelli, Christopher; Shao, Yucai; Chereddy, Sumanth; Wunder, Stephanie; Mohanty, Udayan; Tsung, Chia‐Kuang; Wang, Dunwei
• Is Part Of: Angewandte Chemie. Volume 131:Number 43(2019)
• Page Start: 15457
• Page End: 15461
• Publication Date: 2019-09-13
• Subjects: Dünnfilme -- Ionentransport -- Metall-organische Gerüste -- Mg-Batterien -- Selektivität; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201908706
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: 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. Abstract : Ein MOF‐Dünnfilm (bis hinunter zu 200 nm Schichtdicke) wurde synthetisiert und ermöglicht selektiven Mg 2+ ‐Transport mit vernachlässigbarer Aktivität gegenüber Lösungsmittel und Gegenionen. Direkt auf einem porösen, anodisierten Aluminiumoxid‐Träger synthetisiert, erlaubt er ein stabiles Entfernen und Aufbringen von Mg bei niedriger Überspannung. Die Arbeit zeigt, dass MOF‐Dünnfilme vielversprechend für zukünftige Mg‐Batterieanwendungen sind.