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

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 opp...

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Detalles Bibliográficos
Autores: Besnardiere, Julie, Ma, Binghua, Torres Pardo, María De La Almudena, Wallez, Gilles, Kabbour, Houria, González Calbet, José María, Von Bardeleben, Hans Jürgen, Fleury, Benoit, Buissette, Valérie, Sanchez, Clément, Le Mercier, Thierry, Cassaignon, Sophie, Portehault, David
Tipo de recurso: artículo
Fecha de publicación:2019
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/107286
Acceso en línea:https://hdl.handle.net/20.500.14352/107286
Access Level:acceso abierto
Palabra clave:Química inorgánica (Química)
Química física (Química)
2210 Química Física
2210.28 Química del Estado Sólido
Descripción
Sumario: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’-H>0.07WO3. 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.

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