Structure and electrochromism of two-dimensional octahedral molecular sieve h’-WO3

Julie Besnardiere, Binghua Ma, Almudena Torres-Pardo, Gilles Wallez, Houria Kabbour, José M. González-Calbet, Hans Jürgen Bardeleben, Benoit Fleury, Valérie Buissette, Clément Sanchez, Thierry Mercier, Sophie Cassaignon and David Portehault ()
Additional contact information
Julie Besnardiere: Laboratoire Chimie de la Matière Condensée de Paris, LCMCP
Binghua Ma: Laboratoire Chimie de la Matière Condensée de Paris, LCMCP
Almudena Torres-Pardo: Universidad Complutense
Gilles Wallez: Institut de Recherche de Chimie de Paris
Houria Kabbour: UMR 8181-UCCS-Unité de Catalyse et de Chimie du Solide
José M. González-Calbet: Universidad Complutense
Hans Jürgen Bardeleben: Institut des Nanosciences de Paris, INSP
Benoit Fleury: Institut Parisien de Chimie Moléculaire, IPCM
Valérie Buissette: Centre de Recherches d’Aubervilliers
Clément Sanchez: Laboratoire Chimie de la Matière Condensée de Paris, LCMCP
Thierry Mercier: Centre de Recherches d’Aubervilliers
Sophie Cassaignon: Laboratoire Chimie de la Matière Condensée de Paris, LCMCP
David Portehault: Laboratoire Chimie de la Matière Condensée de Paris, LCMCP

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Octahedral molecular sieves (OMS) are built of transition metal-oxygen octahedra that delimit sub-nanoscale cavities. Compared to other microporous solids, OMS exhibit larger versatility in properties, provided by various redox states and magnetic behaviors of transition metals. Hence, OMS offer opportunities in electrochemical energy harnessing devices, including batteries, electrochemical capacitors and electrochromic systems, provided two conditions are met: fast exchange of ions in the micropores and stability upon exchange. Here we unveil a novel OMS hexagonal polymorph of tungsten oxide called h’-WO3, built of (WO6)6 tunnel cavities. h’-WO3 is prepared by a one-step soft chemistry aqueous route leading to the hydrogen bronze h’-H0.07WO3. Gentle heating results in h’-WO3 with framework retention. The material exhibits an unusual combination of 1-dimensional crystal structure and 2-dimensional nanostructure that enhances and fastens proton (de)insertion for stable electrochromic devices. This discovery paves the way to a new family of mixed valence functional materials with tunable behaviors.

Date: 2019
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DOI: 10.1038/s41467-018-07774-x

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