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Ultrahigh Proton Conduction via Extended Hydrogen-Bonding Network in a Preyssler-Type Polyoxometalate-Based Framework Functionalized with a Lanthanide Ion

Lookup NU author(s): Dr Paul Waddell, Dr John ErringtonORCiD



This is the authors' accepted manuscript of an article that has been published in its final definitive form by American Chemical Society, 2021.

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The exploration of composition−structure−function relationship in proton-conducting solids remains a challenge in materials chemistry. Polyoxometalate-based compounds have been long considered as candidates for proton conductors; however, their low structural stability and a large decrease in conductivity under reduced relative humidity (RH) have limited their applications. To overcome such limitations, the hybridization of polyoxometalates with proton-conducting polymers has emerged as a promising method. Besides, 4f lanthanide ions possess a high coordination number, which can be utilized to attract water molecules and to build robust frameworks. Herein, a Preyssler-type polyoxometalate functionalized with a 9-coordinate Eu 3+ (Eu[P5 W30 O110 K]11− ) is newly synthesized and combined with poly(allylamine) with amine moieties as protonation sites. The resulting robust crystalline composite exhibits an ultrahigh proton conductivity >10 −2 S cm −1 at 368 K and 90% RH, which is still >10 −3 S cm −1 at 50% RH, due to the strengthened and extended hydrogen-bonding network.

Publication metadata

Author(s): Iwano T, Shitamatsu K, Ogiwara N, Okuno M, Kikukawa Y, Ikemoto S, Shirai S, Muratsugu S, Waddell PG, Errington RJ, Sadakane M, Uchida S

Publication type: Article

Publication status: Published

Journal: ACS Applied Materials and Interfaces

Year: 2021

Volume: 13

Issue: 16

Pages: 19138-19147

Print publication date: 28/04/2021

Online publication date: 19/04/2021

Acceptance date: 30/03/2021

Date deposited: 13/05/2021

ISSN (print): 1944-8244

ISSN (electronic): 1944-8252

Publisher: American Chemical Society


DOI: 10.1021/acsami.1c01752


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