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

Julie Besnardiere 1 Binghua Ma 1 Almudena Torres-Pardo 2 Gilles Wallez 3 Houria Kabbour 4 José González-Calbet 5 Hans Jürgen von Bardeleben 6 Benoit Fleury 7 Valerie Buissette 8 Clément Sanchez 9, 1 Thierry Le Mercier 8 Sophie Cassaignon 1 David Portehault 1
1 LCMCP - Laboratoire de Chimie de la Matière Condensée de Paris
2 Departamento de Química Inorgánica
3 IRCP - Institut de Recherche de Chimie Paris
4 UCCS - Unité de Catalyse et de Chimie du Solide - UMR 8181
5 UCM - Universidad Complutense de Madrid [Madrid]
6 INSP - Institut des Nanosciences de Paris
7 IPCM - Institut Parisien de Chimie Moléculaire
8 Centre de Recherches d'Aubervilliers
9 UB - Université de Bordeaux
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.
Keywords : Electrochemistry Materials chemistry Nanoscale materials
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Julie Besnardiere, Binghua Ma, Almudena Torres-Pardo, Gilles Wallez, Houria Kabbour, et al.. Structure and electrochromism of two-dimensional octahedral molecular sieve h’-WO3. Nature Communications, Nature Publishing Group, 2019, 10, pp.327. ⟨10.1038/s41467-018-07774-x⟩. ⟨hal-01988310⟩

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